US20060035046A1 - Method for preparing air channel-equipped film for use in vacuum package - Google Patents
Method for preparing air channel-equipped film for use in vacuum package Download PDFInfo
- Publication number
- US20060035046A1 US20060035046A1 US11/241,205 US24120505A US2006035046A1 US 20060035046 A1 US20060035046 A1 US 20060035046A1 US 24120505 A US24120505 A US 24120505A US 2006035046 A1 US2006035046 A1 US 2006035046A1
- Authority
- US
- United States
- Prior art keywords
- heat
- sheet
- cooling roll
- sealable resin
- layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/06—Embossing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
- B29C43/222—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length characterised by the shape of the surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
- B29C43/28—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
- B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
- B29C59/04—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts
- B29C59/046—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts for layered or coated substantially flat surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
- B65D31/02—Bags or like containers made of paper and having structural provision for thickness of contents with laminated walls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/18—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient
- B65D81/20—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas
- B65D81/2007—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas under vacuum
- B65D81/2023—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas under vacuum in a flexible container
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
- B65D81/18—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient
- B65D81/20—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas
- B65D81/2007—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas under vacuum
- B65D81/2038—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents providing specific environment for contents, e.g. temperature above or below ambient under vacuum or superatmospheric pressure, or in a special atmosphere, e.g. of inert gas under vacuum with means for establishing or improving vacuum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/02—Open containers
- B32B2439/06—Bags, sacks, sachets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
- B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
- B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1334—Nonself-supporting tubular film or bag [e.g., pouch, envelope, packet, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1334—Nonself-supporting tubular film or bag [e.g., pouch, envelope, packet, etc.]
- Y10T428/1341—Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
- Y10T428/1379—Contains vapor or gas barrier, polymer derived from vinyl chloride or vinylidene chloride, or polymer containing a vinyl alcohol unit
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
- Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
- Y10T428/139—Open-ended, self-supporting conduit, cylinder, or tube-type article
- Y10T428/1393—Multilayer [continuous layer]
Definitions
- the present invention relates to a method for preparing an air channel-equipped film for use in vacuum packages. More specifically, the present invention is directed to a method for preparing an air channel-equipped film, in which a heat-sealable resin layer having channels for the evacuation of air formed in a pattern defined by grooves on a cooling roll is formed on a gas-impermeable base layer, and a bag for use in vacuum packages produced by use of such films.
- the conventional bag comprises a main body 110 with both sheets 111 and 112 consisting of a plastic-based film; a sealed part 120 in which a lower, a left, and a right edge of the main body 110 are heat-sealed so as to form an inner space for receiving perishable products such as foods; and an unsealed part 130 provided at an upper edge of the main body 110 , through which perishable products are stuffed into the main body 110 and air is evacuated from the inside of the main body 110 .
- the main body 110 is generally made of a thermoplastic polyethylene resin which is melted by heat and is harmless to a human body.
- the unsealed part 130 After foods are stuffed through the unsealed part 130 into the bag and air is evacuated from the inside of the bag by use of an air pump or another vacuum processing machine, the unsealed part is heated to a predetermined temperature and pressed to seal the bag.
- the bag as above is disadvantageous in that both sheets 111 and 112 of the main body 110 are quickly adhered to each other while some of air is discharged from the bag when perishable products are stuffed into the bag and air in the bag is evacuated by use of a vacuum processing machine, and thus air remaining in the lower part of the bag may not evacuated.
- air channels are formed on one sheet or both sheets of a film constituting the main body, and air is evacuated along the air channel from the bag during the evacuation of air in the bag by the vacuum processing machine, thereby air existing in the lower par of the bag is easily evacuated from the bag.
- U.S. Pat. No. 2,778,173 discloses a method of producing airtight packages using the above technology. According to this method, an evacuating opening is formed on a first sheet, and a second sheet is laid overlapped with the first sheet in such a way that the second sheet precisely overlaps the first sheet. At this time, a plurality of spacing projections are formed on at least one of the two sheets, thereby channels for the movement of air, connected to the openings, are formed.
- the projections may take shapes of pyramid and hemisphere, and are formed by pressing the film constituting the sheet using heated female and male dies or various tools.
- the channels are formed by interposing a strip with projections between the first sheet and the second sheet.
- a main body of the conventional bag for use in vacuum packages as shown in FIG. 1 consists of laminated films, and at least one sheet of the main body is embossed by use of an embossing mold.
- FIG. 2 is a schematic perspective view of the conventional bag for use in vacuum packages, with its one side being subjected to embossing.
- one film layer 113 of laminated film layers 113 and 114 constituting the main body 110 of the conventional bag for use in vacuum packages as shown in FIG. 2 is embossed to form protrusions 116 and channels 115 defined by the space between protrusions 116 , so that air is readily evacuated from the bag.
- the bag for use in vacuum packages consists of a first panel and a second panel overlapping each other, and panels each having a predetermined thickness are sealed to each other at a lower, a left, and a right edge except an inlet for receiving products.
- the first and the second panel each consist of a heat-sealable inner layer with a uniform thickness and a gas-impermeable outer layer with a uniform thickness, and a plurality of protrusions are formed in a waffle-shaped pattern on an inner and an outer surface of at least one panel of the first panel and the second panel (refer to FIGS. 6 and 7 in U.S. Pat. No. Re.
- an embossing pattern is formed on a hot roller, and the laminated film consisting of the gas-impermeable sheet and the heat-sealable sheet is provided to the hot roller and embossed with heating to form channels 115 and protrusions 116 .
- the protrusions and channels are forcibly formed on the film with a predetermined thickness by heat, the contacting portion between the channel and the protrusion is drawn and such a drawn portion of the film becomes thin.
- the film may be torn during the embossing, or pinholes may be formed on the film due to re-drawing of the film during forming a vacuum in the bag, and so environmental air flows into the bag.
- it is necessary to frequently replace the embossing mold with a new one because the film may be damaged due to abrasion of the embossing mold when the embossing mold is used for a long time.
- U.S. Pat. No. 5,554,423 corresponding to EP 0 648 688 B1 discloses a bag for use in vacuum packages using another type of protrusions.
- a tubular element for forming bags for the vacuum-packing of products comprises a first sheet consisting of a gas-impermeable outer layer and a heat-sealable inner layer and a second sheet consisting of a gas-impermeable outer layer and a heat-sealable inner layer, and the first sheet and the second sheet are adhered to each other at an upper and a lower edge to form a space for receiving perishable products in the bag.
- a plurality of heat-sealable strand elements are heat bonded at regular intervals to the inner sheet of any one sheet of the first sheet and the second sheet in such a way that heat-sealable strand elements extend along a length of the tubular element substantially parallel to the upper and lower bonded edges, thereby a space between strand elements acts as a channel for the evacuation of air.
- FIG. 3 schematically illustrates arrangement and heat bonding of a plurality of heat-sealable strand elements on the sheet.
- a plurality of strand elements 4 extruded from an extrusion head 2 for use in producing strand elements are arranged at regular intervals on the heat-sealable layer of the laminated sheet 1 consisting of the gas-impermeable layer and the heat-sealable layer, and heat bonded to a surface of the heat-sealable layer by use of pressure rollers 3 and 3 ′.
- this patent is disadvantageous in that separate equipments are required for producing strand elements, and a procedure of heat bonding a plurality of strand elements at regular intervals to the heat-sealable inner layer is very complicated.
- Other disadvantages are that various shapes of pattern are hard to form, i.e. only strand type channels are formed, and the production of the film with relatively thin thickness is difficult because the strand elements for channels are additionally formed on the heat-sealable inner layer having a predetermined thickness.
- FIG. 4 another method of preparing a film for use in vacuum packages is illustrated, in which channels are directly formed on a heat-sealable inner layer by a co-extrusion process using blowing, and the resulting heat-sealable inner layer is laminated on a gas-impermeable outer layer.
- protrusions 5 are equipped on a co-extrusion ring of the inner layer, and so channels are formed by the protrusions on the film for use in vacuum packages when the film is upwardly blown.
- this method is disadvantageous in that only stripe-shaped channels are formed in itself on the film regardless of the shape of the protrusions, and so various shapes of channels cannot be obtained.
- the present inventors have conducted extensive studies into an improved method of preparing a film for use in vacuum packages, resulting in the finding that the film for use in vacuum packages, which is prepared in such a manner that a heat-sealable resin melt-extruded through a nozzle of an extruder and a gas-impermeable base layer are provided between a laminating roll and a cooling roll having grooves formed in a predetermined pattern on a surface thereof, thereby the heat-sealable layer with protrusions and channels for the evacuation of air is formed on the gas-impermeable base layer, can easily overcome the disadvantages encountered in the prior arts.
- a provision of a method for preparing an air channel-equipped film for use in vacuum packages which comprises the step of providing a gas-impermeable base, along with a melt-extruded heat-sealable resin, to a laminating unit consisting of a laminating roll and a cooling roll, to from a heat-sealable resin layer on the gas-impermeable base, characterized in that the heat-sealable resin is molded and cooled in such a way that a plurality of protrusions, corresponding to a plurality of grooves formed in a predetermined pattern on the circumferential surface of the cooling roll, are formed on the molded heat-sealable resin layer, defining channels for the evacuation of air therebetween.
- a bag for use in vacuum packages which comprises a first sheet and a second sheet, one overlapping the other.
- Each of the two sheets is composed of a laminated film consisting of a gas-impermeable base layer as an outer layer and a heat-sealable resin layer as an inner layer, wherein at least one of the first sheet and the second sheet is a film for use in vacuum packages produced according to the method of this invention.
- the first sheet and the second sheet are bonded to each other along their lower, left, and right edges so as to form a space for receiving a product to be vacuum packaged therein.
- FIG. 1 is a schematic perspective view of the conventional bag for use in vacuum packages
- FIG. 2 is a schematic perspective view of the conventional bag for use in vacuum packages, with its one sheet being subjected to embossing;
- FIG. 3 illustrates heat bonding of a plurality of heat-sealable strand elements onto a surface of a heat-sealable layer of a laminated sheet comprising a gas-impermeable layer and the heat-sealable layer according to the conventional method;
- FIG. 4 illustrates a formation of air channels by the conventional co-extrusion process using blowing
- FIG. 5 schematically illustrates a formation of a heat-sealabel resin layer with protrusions and channels for the evacuation of air on a gas-impermeable base layer of the film according to an embodiment of the present invention
- FIG. 6 is a partial expanded view of FIG. 5 illustrating a formation of the heat-sealable resin layer with protrusions and channels for the evacuation of air on the gas-impermeable base layer of the film according to the embodiment of the present invention
- FIG. 7 is a schematic partial perspective view of an extruder shown in FIG. 5 ;
- FIG. 8 is a plane view of the film for use in vacuum packages according to an embodiment of the present invention.
- FIG. 9 is a plane view of the film for use in vacuum packages according to another embodiment of the present invention.
- FIG. 10 is a schematic perspective view of a bag for use in vacuum packages according to a further embodiment of the present invention.
- a laminating roll 20 ′ and a cooling roll 20 constituting a laminating unit are arranged at regular intervals so that the melt-extruded heat-sealable resin layer is stacked on the gas-impermeable base layer while the heat-sealable resin is cooled.
- Illustrative, but non-limiting examples of materials of the laminating roll and the cooling roll include steel and rubber.
- the space between the laminating roll and the cooling roll is desirably controlled according to specifications (for example, thickness) of the film for use in vacuum packages. It is preferable to control the temperature of the cooling roll in a range of about ⁇ 15 to about ⁇ 10° C. so that the melt-extruded resin is cooled.
- the temperature of the cooling roll may be varied according to a laminating condition.
- the cooling roll has a larger diameter than the laminating roll, for example, the diameter of the cooling roll is about 1.5 to about 3 times as large as that of the laminating roll. This range is set forth to illustrate, but is not to be construed to limit the diameter of the cooling roll.
- the gas-impermeable base 10 is fed to the nip between the cooling roll 20 and the laminating roll 20 ′ by a feeding means (not shown in FIG. 5 ).
- the gas-impermeable base include polyester, polyamide, and EVOH (ethylene vinyl alcohol), and it is preferable that the gas-impermeable base is made of materials capable of securing mechanical properties when subject to heating in the process of the subsequent vacuum packaging.
- the heat-sealable resin is typically made of a thermoplastic resin. After perishable products are stuffed into a bag for use in vacuum packages produced by using a laminated film of the present invention and air which is present in the bag is evacuated, the heat-sealable resin layer of the two sheets in contact with each other while being heated, should be strongly bonded to each other so as to prevent environmental air from penetrating into the bag.
- the heat-sealable resin is made of polyethylene (PE) suitable to preserve foods and harmless to a human body.
- an extruder 30 is positioned in such a way that the melt-extruded heat-sealable resin is layered on the base layer by feeding the extruded heat-sealable resin to the nip between the cooling roll 20 and the laminating roll 20 ′.
- the heat-sealable resin is fed through a nozzle 31 of the extruder 30 .
- the temperature of the melt-extruded heat-sealable resin depends on a kind of the used resin, and preferably, ranges from about 200 to about 250° C.
- the amount of resin to be extruded into the laminating unit depends on the required thickness of the heat-sealable resin layer to be positioned on the base layer.
- a plurality of grooves are formed in a predetermined pattern on the circumferential surface of the cooling roll 20 .
- FIG. 5 a film for use in vacuum packages according to an embodiment of the present invention is illustrated, in which the heat-sealable resin layer is molded in such a way that protrusions corresponding to illustrative-shaped grooves formed in a predetermined pattern on the circumferential surface of the cooling roll and air channels defined by the space between the protrusions, are formed on the molded heat-sealable resin layer.
- the heat-sealable resin melt-extruded by the extruder is fed through the nozzle of the extruder, and naturally molded by the grooves of the cooling roll while being cooled.
- the melt-extruded heat-sealable resin is fed along with the base layer to a laminating unit consisting of the laminating roll and the cooling roll having the grooves formed in a predetermined pattern, and the heat-sealable resin is molded in such a way that a plurality of protrusions, corresponding to the grooves formed on the circumferential surface of the cooling roll, are formed on the molded heat-sealable resin layer, defining channels for the evacuation of air therebetween, thereby the film for use in vacuum packages 40 of the present invention can be prepared.
- the pattern of the grooves can be formed in desired various shapes such as straight lines and curved lines according to shapes of desired channels, and the shape of the pattern is not limited. Unlike the conventional method adopting a post-embossing treatment, in case that the melt-extruded heat-sealable resin is molded and cooled by use of the grooves according to the present invention, the performance of securing a vacuum by use of the melt-extruded heat-sealable resin is not poor, even though the heat-sealable resin layer is kept thin.
- FIG. 6 is a partial expanded view of FIG. 5 illustrating formation of the heat-sealable resin layer with protrusions and channels for the evacuation of air on the gas-impermeable base layer
- FIG. 7 is a schematic partial perspective view of an extruder shown in FIG. 5 .
- the extruded heat-sealable resin is fed through a nozzle 32 of a nozzle part 31 to the laminating unit, as shown in FIG. 7 .
- the base 10 is fed to the nip between the cooling roll 20 and the laminating roll 20 ′ constituting the laminating unit.
- a plurality of grooves 21 are formed in a predetermined pattern on the circumferential surface of the cooling roll 20 .
- each of the grooves is formed in an uneven pattern on the circumferential surface of the cooling roll 20 such that each groove is symmetrical with neighboring grooves.
- the extruder 30 is positioned between the cooling roll 20 having the grooves 21 with a predetermined pattern and the laminating roll 20 ′, and the heat-sealable resin extruded by the nozzle 32 of the extruder 30 is pressed, along with the base 10 , by the cooling roll 20 and the laminating roll 20 ′ constituting the laminating unit to form protrusions corresponding to the grooves of the cooling roll 20 on the heat-sealable resin layer formed on the upper surface of the film 40 for use in vacuum packages.
- channels for the evacuation of air are formed on the heat-sealable resin layer at positions between protrusions formed by the grooves 21 of the cooling roll 20 .
- the channels may be formed in such a way that a plurality of stripes or crossed stripes are longitudinally extended on the film.
- the stripe- or cross stripe-shaped channels are set forth to illustrate, but are not to be construed to limit the shape of the channel. Therefore, any shapes of the channels can be applied to a bag for use in vacuum packages of the present invention.
- the grooves are formed in a predetermined uneven pattern on the circumferential surface of the cooling roll, and so a plurality of protrusions are formed on the heat-sealable resin layer and define channels therebetween, which act as channels for the movement of air. Therefore, the shape of the channels of the present invention is determined by the pattern on the cooling roll. On the other hand, the cooling roll having protrusions with the uneven pattern may be employed, so that the resulting channels take an uneven pattern.
- FIG. 8 a plane view of the film for use in vacuum packages according to an embodiment of the present invention is illustrated, in which a plurality of protrusions with the uneven pattern are positioned on the film and channels formed at the gaps between the protrusions are longitudinally extended. Therefore, air remaining in the bag is smoothly evacuated along the channels during the evacuation of air.
- FIG. 9 a plane view of a film for use in vacuum packages according to another embodiment of the present invention is illustrated.
- a plurality of grooves are foamed in a wave pattern on the circumferential surface of the cooling roll, and thus channels defined by the gaps between protrusions take the shape of the wave pattern.
- each protrusion formed on the heat-sealable resin layer of a laminated film 40 is determined by the depth of grooves 21 formed on the cooling roll 20 , and the width of the channel is determined by the interval between the grooves 21 .
- the shape, width, and thickness of the channels for the evacuation of air, defined by the gaps between protrusions are controlled by changing the specifications for the grooves of the cooling roll according to use of the laminated film.
- each channel ranges from about 40 to about 100 ⁇ m in depth
- each protrusion and the base layer are about 150 to about 300 ⁇ m and about 30 to about 200 ⁇ m in thickness, respectively.
- the dimensions of the channel, the protrusion, and the base layer are set forth to illustrate, but are not to be construed to limit the dimensions.
- the base layer may consist of one layer, or two or more layers.
- a total thickness thereof is also adjusted within the allowable range for the base layer.
- the bag 50 for use in vacuum packages consists of a first sheet 51 and a second sheet 52 overlapping each other, and channels are formed on any one of the first sheet 51 and the second sheet 52 .
- the heat-sealable resin layer and the base layer of each sheet are typically made of the same material as those of the other sheet, but they may also be made of different materials.
- the heat-sealable resin layer is used as an inner layer and the base layer is used as an outer layer.
- lower, left, and right edges of the first and the second sheet are bonded to each other so as to form a space for receiving a product to be vacuum packaged.
- the sheet In case of using the sheet on which channels are not formed, the sheet ranges from about 50 to about 150 gm in thickness.
- channels with a predetermined pattern are formed on any one of the first sheet and the second sheet.
- a film, in which channels with a predetermined pattern are formed may be useful as the material of both the first sheet and the second sheet of the bag for use in vacuum packages of this invention.
- various shapes of bags for use in vacuum packages can be prepared by using the laminated film having channels of the present invention.
- a polyamide base layer with a width of 1200 mm and a thickness of 75 ⁇ m was fed to a laminating unit at a rate of 80 m/min, as shown in FIG. 5 .
- a laminating roll and a cooling roll made of steel were 250 ⁇ and 500 ⁇ in diameter, respectively, and the depth of each groove on the cooling roll was 0:8 mm.
- the gap between the laminating roll and the cooling roll was 100, ⁇ m, and an extruder was positioned around the nip between the laminating roll and the cooling roll so that a melt-extruded polyethylene resin (CA-110 made by SK Corp.) at 220° C.
- CA-110 made by SK Corp.
- the film for use in vacuum packages thus produced comprised a base layer with a thickness of 75 ⁇ m, protrusions with a thickness of 250 ⁇ m, and channels with a depth of 25 ⁇ m, and was used as a first sheet.
- a second sheet was produced according to the same procedure as the first sheet, and combined with the first sheet to prepare a bag of 300 ⁇ 400 mm for use in vacuum packages. At this time, the second sheet does not have channels, and the base layer and the heat-sealable resin layer were 75 ⁇ m and 25 ⁇ m in thickness, respectively.
- protrusions and channels are naturally formed on a heat-sealable resin layer by grooves of a cooling roll when a heat-sealable resin is layered on a gas-impermeable base. Therefore, the method is simple because of its ability to form air channels without the aid of additional embossing techniques, as well as being economically favorable owing to the employment of no embossing molds. Also, the freedom in patterning the grooves of the cooling roll makes it possible to form versatile air channel patterns and to easily control the intervals between the air channels, with an increase in productivity of about 50% compared to the conventional techniques.
Abstract
Disclosed is a method for preparing an air channel-equipped film for use in vacuum packages, which comprises the step of providing a gas-impermeable base, along with a melt-extruded heat-sealable resin, to a laminating unit consisting of a laminating roll and a cooling roll, to form a heat-sealable resin layer on the gas-impermeable base, characterized in that the heat-sealable resin is molded and quenched in such a way that a plurality of protrusions, corresponding to a plurality of grooves formed in a predetermined pattern on the circumferential surface of the cooling roll, are formed on the molded heat-sealable resin layer, defining channels for the evacuation of air therebetween. The method is simple because of its ability to form air channels without the aid of additional embossing techniques, as well as being economically favorable owing to the employment of no embossing molds.
Description
- This application is a continuation of U.S. Application No. 10/169,485 filed Jun. 26, 2002, now pending, which is a 35 USC § 371 application of International Application No. PCT/KR02/00283 filed Feb. 21, 2002 designating the United States, which claims priority to KR Application No. 2001-8724 filed Feb. 21, 2001, and claims priority to KR Application No. 2002-9064 filed Feb. 20, 2002, all of which are incorporated herein by reference in their entirety.
- The present invention relates to a method for preparing an air channel-equipped film for use in vacuum packages. More specifically, the present invention is directed to a method for preparing an air channel-equipped film, in which a heat-sealable resin layer having channels for the evacuation of air formed in a pattern defined by grooves on a cooling roll is formed on a gas-impermeable base layer, and a bag for use in vacuum packages produced by use of such films.
- In various countries including the United States, a method of preserving perishable foods such as meats or processed meats for a long term has been widely used, comprising the steps of stuffing foods into a plastic bag capable of maintaining a vacuum therein, evacuating air from the bag by use of an air pump or another vacuum processing machine, and tightly sealing the bag.
- With reference to
FIG. 1 , a schematic perspective view of the conventional bag for use in vacuum packages is illustrated. The conventional bag comprises amain body 110 with bothsheets part 120 in which a lower, a left, and a right edge of themain body 110 are heat-sealed so as to form an inner space for receiving perishable products such as foods; and anunsealed part 130 provided at an upper edge of themain body 110, through which perishable products are stuffed into themain body 110 and air is evacuated from the inside of themain body 110. At this time, themain body 110 is generally made of a thermoplastic polyethylene resin which is melted by heat and is harmless to a human body. - After foods are stuffed through the
unsealed part 130 into the bag and air is evacuated from the inside of the bag by use of an air pump or another vacuum processing machine, the unsealed part is heated to a predetermined temperature and pressed to seal the bag. - However, the bag as above is disadvantageous in that both
sheets main body 110 are quickly adhered to each other while some of air is discharged from the bag when perishable products are stuffed into the bag and air in the bag is evacuated by use of a vacuum processing machine, and thus air remaining in the lower part of the bag may not evacuated. - To avoid the above disadvantage, a technology for forming air channels by processing the conventional sheet with the aid of embossing techniques was developed. According to the technology, air channels are formed on one sheet or both sheets of a film constituting the main body, and air is evacuated along the air channel from the bag during the evacuation of air in the bag by the vacuum processing machine, thereby air existing in the lower par of the bag is easily evacuated from the bag.
- U.S. Pat. No. 2,778,173 discloses a method of producing airtight packages using the above technology. According to this method, an evacuating opening is formed on a first sheet, and a second sheet is laid overlapped with the first sheet in such a way that the second sheet precisely overlaps the first sheet. At this time, a plurality of spacing projections are formed on at least one of the two sheets, thereby channels for the movement of air, connected to the openings, are formed. In addition, the projections may take shapes of pyramid and hemisphere, and are formed by pressing the film constituting the sheet using heated female and male dies or various tools. Alternatively, the channels are formed by interposing a strip with projections between the first sheet and the second sheet.
- According to this method, projections in a blank of flexible, fluid-tight sheet material to provide channels between the projections, and one sheet portion of the blank is folded over another sheet portion of the blank with the projections between the sheet portions and with the peripheral edges of the sheet portions contacting each other. Then, the contacting peripheral edges are sealed to each other for part of their length to form an envelope having an inlet at the unsealed part of the peripheral edges. A commodity is introduced into the envelope through the inlet and the remainder of the contacting peripheral edges is sealed to each other to close the inlet. Thereafter, an evacuating opening is pierced in a part of the sheet material which communicates with the channels, air is removed from the interior of the envelope through the channels and opening, and the opening is sealed. However, this method is disadvantageous in that two sealing steps are additionally required after the commodity is stuffed into the envelope.
- To avoid the above disadvantage, another technology was developed, in which a main body of the conventional bag for use in vacuum packages as shown in
FIG. 1 consists of laminated films, and at least one sheet of the main body is embossed by use of an embossing mold. -
FIG. 2 is a schematic perspective view of the conventional bag for use in vacuum packages, with its one side being subjected to embossing. In this technology, onefilm layer 113 of laminatedfilm layers main body 110 of the conventional bag for use in vacuum packages as shown inFIG. 2 is embossed to formprotrusions 116 andchannels 115 defined by the space betweenprotrusions 116, so that air is readily evacuated from the bag. - Such a technology is exemplified in U.S. Pat. No. Re. 34,929. The bag for use in vacuum packages consists of a first panel and a second panel overlapping each other, and panels each having a predetermined thickness are sealed to each other at a lower, a left, and a right edge except an inlet for receiving products. Furthermore, the first and the second panel each consist of a heat-sealable inner layer with a uniform thickness and a gas-impermeable outer layer with a uniform thickness, and a plurality of protrusions are formed in a waffle-shaped pattern on an inner and an outer surface of at least one panel of the first panel and the second panel (refer to
FIGS. 6 and 7 in U.S. Pat. No. Re. 34,929). In particular, an embossing pattern is formed on a hot roller, and the laminated film consisting of the gas-impermeable sheet and the heat-sealable sheet is provided to the hot roller and embossed with heating to formchannels 115 andprotrusions 116. However, when the protrusions and channels are forcibly formed on the film with a predetermined thickness by heat, the contacting portion between the channel and the protrusion is drawn and such a drawn portion of the film becomes thin. Thus, the film may be torn during the embossing, or pinholes may be formed on the film due to re-drawing of the film during forming a vacuum in the bag, and so environmental air flows into the bag. Also, it is necessary to frequently replace the embossing mold with a new one because the film may be damaged due to abrasion of the embossing mold when the embossing mold is used for a long time. - Meanwhile, U.S. Pat. No. 5,554,423 corresponding to EP 0 648 688 B1 discloses a bag for use in vacuum packages using another type of protrusions. According to this patent, a tubular element for forming bags for the vacuum-packing of products comprises a first sheet consisting of a gas-impermeable outer layer and a heat-sealable inner layer and a second sheet consisting of a gas-impermeable outer layer and a heat-sealable inner layer, and the first sheet and the second sheet are adhered to each other at an upper and a lower edge to form a space for receiving perishable products in the bag. In particular, a plurality of heat-sealable strand elements are heat bonded at regular intervals to the inner sheet of any one sheet of the first sheet and the second sheet in such a way that heat-sealable strand elements extend along a length of the tubular element substantially parallel to the upper and lower bonded edges, thereby a space between strand elements acts as a channel for the evacuation of air. In this respect,
FIG. 3 schematically illustrates arrangement and heat bonding of a plurality of heat-sealable strand elements on the sheet. According to this patent, a plurality ofstrand elements 4 extruded from an extrusion head 2 for use in producing strand elements are arranged at regular intervals on the heat-sealable layer of the laminatedsheet 1 consisting of the gas-impermeable layer and the heat-sealable layer, and heat bonded to a surface of the heat-sealable layer by use ofpressure rollers - Referring to
FIG. 4 , another method of preparing a film for use in vacuum packages is illustrated, in which channels are directly formed on a heat-sealable inner layer by a co-extrusion process using blowing, and the resulting heat-sealable inner layer is laminated on a gas-impermeable outer layer. - In detail,
protrusions 5 are equipped on a co-extrusion ring of the inner layer, and so channels are formed by the protrusions on the film for use in vacuum packages when the film is upwardly blown. However, this method is disadvantageous in that only stripe-shaped channels are formed in itself on the film regardless of the shape of the protrusions, and so various shapes of channels cannot be obtained. Furthermore, there is a limitation in making narrow a space between channels due to characteristics of the co-extrusion process using blowing, so that sheets constituting the main body of the bag are readily adhered to each other during vacuum packing. Thus, the formation of a vacuum in the bag is not sufficient. - Therefore, there remains a need for providing a method of preparing a film for use in vacuum packages, by which more various channel patterns can be achieved with ease compared with the conventional method.
- The present inventors have conducted extensive studies into an improved method of preparing a film for use in vacuum packages, resulting in the finding that the film for use in vacuum packages, which is prepared in such a manner that a heat-sealable resin melt-extruded through a nozzle of an extruder and a gas-impermeable base layer are provided between a laminating roll and a cooling roll having grooves formed in a predetermined pattern on a surface thereof, thereby the heat-sealable layer with protrusions and channels for the evacuation of air is formed on the gas-impermeable base layer, can easily overcome the disadvantages encountered in the prior arts.
- Therefore, it is an object of the present invention to provide a method of preparing a film for use in vacuum packages, which can effectively prevent pinholes from occurring and can improve an ability to form a vacuum by precisely forming channels.
- It is another object of the present invention to provide a method of preparing a film for use in vacuum packages, in which various channel patterns of the film can be readily provided.
- It is still another object of the present invention to provide a method of preparing a thin film with excellent physical properties, for use in vacuum packages.
- It is yet another object of the present invention to provide a bag for use in vacuum packages produced by use of the film according to the present invention.
- Based on the present invention, the above objects of the present invention can be accomplished by a provision of a method for preparing an air channel-equipped film for use in vacuum packages, which comprises the step of providing a gas-impermeable base, along with a melt-extruded heat-sealable resin, to a laminating unit consisting of a laminating roll and a cooling roll, to from a heat-sealable resin layer on the gas-impermeable base, characterized in that the heat-sealable resin is molded and cooled in such a way that a plurality of protrusions, corresponding to a plurality of grooves formed in a predetermined pattern on the circumferential surface of the cooling roll, are formed on the molded heat-sealable resin layer, defining channels for the evacuation of air therebetween.
- In addition, according to the present invention, a bag for use in vacuum packages is provided, which comprises a first sheet and a second sheet, one overlapping the other. Each of the two sheets is composed of a laminated film consisting of a gas-impermeable base layer as an outer layer and a heat-sealable resin layer as an inner layer, wherein at least one of the first sheet and the second sheet is a film for use in vacuum packages produced according to the method of this invention. The first sheet and the second sheet are bonded to each other along their lower, left, and right edges so as to form a space for receiving a product to be vacuum packaged therein.
- The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
-
FIG. 1 is a schematic perspective view of the conventional bag for use in vacuum packages; -
FIG. 2 is a schematic perspective view of the conventional bag for use in vacuum packages, with its one sheet being subjected to embossing; -
FIG. 3 illustrates heat bonding of a plurality of heat-sealable strand elements onto a surface of a heat-sealable layer of a laminated sheet comprising a gas-impermeable layer and the heat-sealable layer according to the conventional method; -
FIG. 4 illustrates a formation of air channels by the conventional co-extrusion process using blowing; -
FIG. 5 schematically illustrates a formation of a heat-sealabel resin layer with protrusions and channels for the evacuation of air on a gas-impermeable base layer of the film according to an embodiment of the present invention; -
FIG. 6 is a partial expanded view ofFIG. 5 illustrating a formation of the heat-sealable resin layer with protrusions and channels for the evacuation of air on the gas-impermeable base layer of the film according to the embodiment of the present invention; -
FIG. 7 is a schematic partial perspective view of an extruder shown inFIG. 5 ; -
FIG. 8 is a plane view of the film for use in vacuum packages according to an embodiment of the present invention; -
FIG. 9 is a plane view of the film for use in vacuum packages according to another embodiment of the present invention; and -
FIG. 10 is a schematic perspective view of a bag for use in vacuum packages according to a further embodiment of the present invention. - With reference to
FIG. 5 , formation of a heat-sealable resin layer with protrusions and air channels on a gas-impermeable base layer according to an embodiment of the present invention is schematically illustrated. Alaminating roll 20′ and acooling roll 20 constituting a laminating unit are arranged at regular intervals so that the melt-extruded heat-sealable resin layer is stacked on the gas-impermeable base layer while the heat-sealable resin is cooled. Illustrative, but non-limiting examples of materials of the laminating roll and the cooling roll include steel and rubber. The space between the laminating roll and the cooling roll is desirably controlled according to specifications (for example, thickness) of the film for use in vacuum packages. It is preferable to control the temperature of the cooling roll in a range of about −15 to about −10° C. so that the melt-extruded resin is cooled. However, the temperature of the cooling roll may be varied according to a laminating condition. - Typically, the cooling roll has a larger diameter than the laminating roll, for example, the diameter of the cooling roll is about 1.5 to about 3 times as large as that of the laminating roll. This range is set forth to illustrate, but is not to be construed to limit the diameter of the cooling roll.
- The gas-
impermeable base 10 is fed to the nip between the coolingroll 20 and thelaminating roll 20′ by a feeding means (not shown inFIG. 5 ). Examples of the gas-impermeable base include polyester, polyamide, and EVOH (ethylene vinyl alcohol), and it is preferable that the gas-impermeable base is made of materials capable of securing mechanical properties when subject to heating in the process of the subsequent vacuum packaging. - The heat-sealable resin is typically made of a thermoplastic resin. After perishable products are stuffed into a bag for use in vacuum packages produced by using a laminated film of the present invention and air which is present in the bag is evacuated, the heat-sealable resin layer of the two sheets in contact with each other while being heated, should be strongly bonded to each other so as to prevent environmental air from penetrating into the bag. In particular, it is preferable that the heat-sealable resin is made of polyethylene (PE) suitable to preserve foods and harmless to a human body.
- In
FIG. 5 , anextruder 30 is positioned in such a way that the melt-extruded heat-sealable resin is layered on the base layer by feeding the extruded heat-sealable resin to the nip between the coolingroll 20 and thelaminating roll 20′. The heat-sealable resin is fed through anozzle 31 of theextruder 30. At this time, the temperature of the melt-extruded heat-sealable resin depends on a kind of the used resin, and preferably, ranges from about 200 to about 250° C. Furthermore, the amount of resin to be extruded into the laminating unit depends on the required thickness of the heat-sealable resin layer to be positioned on the base layer. - According to the present invention, a plurality of grooves are formed in a predetermined pattern on the circumferential surface of the
cooling roll 20. InFIG. 5 , a film for use in vacuum packages according to an embodiment of the present invention is illustrated, in which the heat-sealable resin layer is molded in such a way that protrusions corresponding to illustrative-shaped grooves formed in a predetermined pattern on the circumferential surface of the cooling roll and air channels defined by the space between the protrusions, are formed on the molded heat-sealable resin layer. - As described above, according to the present invention, the heat-sealable resin melt-extruded by the extruder is fed through the nozzle of the extruder, and naturally molded by the grooves of the cooling roll while being cooled. The melt-extruded heat-sealable resin is fed along with the base layer to a laminating unit consisting of the laminating roll and the cooling roll having the grooves formed in a predetermined pattern, and the heat-sealable resin is molded in such a way that a plurality of protrusions, corresponding to the grooves formed on the circumferential surface of the cooling roll, are formed on the molded heat-sealable resin layer, defining channels for the evacuation of air therebetween, thereby the film for use in
vacuum packages 40 of the present invention can be prepared. The pattern of the grooves can be formed in desired various shapes such as straight lines and curved lines according to shapes of desired channels, and the shape of the pattern is not limited. Unlike the conventional method adopting a post-embossing treatment, in case that the melt-extruded heat-sealable resin is molded and cooled by use of the grooves according to the present invention, the performance of securing a vacuum by use of the melt-extruded heat-sealable resin is not poor, even though the heat-sealable resin layer is kept thin. -
FIG. 6 is a partial expanded view ofFIG. 5 illustrating formation of the heat-sealable resin layer with protrusions and channels for the evacuation of air on the gas-impermeable base layer, andFIG. 7 is a schematic partial perspective view of an extruder shown inFIG. 5 . The extruded heat-sealable resin is fed through anozzle 32 of anozzle part 31 to the laminating unit, as shown inFIG. 7 . - With reference to FIGS. 5 to 7, the
base 10 is fed to the nip between the coolingroll 20 and thelaminating roll 20′ constituting the laminating unit. At this time, a plurality ofgrooves 21 are formed in a predetermined pattern on the circumferential surface of thecooling roll 20. According to the embodiment illustrated inFIG. 5 , each of the grooves is formed in an uneven pattern on the circumferential surface of thecooling roll 20 such that each groove is symmetrical with neighboring grooves. - Moreover, the
extruder 30 is positioned between the coolingroll 20 having thegrooves 21 with a predetermined pattern and thelaminating roll 20′, and the heat-sealable resin extruded by thenozzle 32 of theextruder 30 is pressed, along with thebase 10, by the coolingroll 20 and thelaminating roll 20′ constituting the laminating unit to form protrusions corresponding to the grooves of thecooling roll 20 on the heat-sealable resin layer formed on the upper surface of thefilm 40 for use in vacuum packages. At this time, channels for the evacuation of air are formed on the heat-sealable resin layer at positions between protrusions formed by thegrooves 21 of thecooling roll 20. - According to the present invention, the channels may be formed in such a way that a plurality of stripes or crossed stripes are longitudinally extended on the film. The stripe- or cross stripe-shaped channels are set forth to illustrate, but are not to be construed to limit the shape of the channel. Therefore, any shapes of the channels can be applied to a bag for use in vacuum packages of the present invention.
- With reference to
FIGS. 5 and 6 , the grooves are formed in a predetermined uneven pattern on the circumferential surface of the cooling roll, and so a plurality of protrusions are formed on the heat-sealable resin layer and define channels therebetween, which act as channels for the movement of air. Therefore, the shape of the channels of the present invention is determined by the pattern on the cooling roll. On the other hand, the cooling roll having protrusions with the uneven pattern may be employed, so that the resulting channels take an uneven pattern. - Referring to
FIG. 8 , a plane view of the film for use in vacuum packages according to an embodiment of the present invention is illustrated, in which a plurality of protrusions with the uneven pattern are positioned on the film and channels formed at the gaps between the protrusions are longitudinally extended. Therefore, air remaining in the bag is smoothly evacuated along the channels during the evacuation of air. - Turning now to
FIG. 9 , a plane view of a film for use in vacuum packages according to another embodiment of the present invention is illustrated. In this embodiment, a plurality of grooves are foamed in a wave pattern on the circumferential surface of the cooling roll, and thus channels defined by the gaps between protrusions take the shape of the wave pattern. - Meanwhile, the thickness of each protrusion formed on the heat-sealable resin layer of a
laminated film 40 is determined by the depth ofgrooves 21 formed on thecooling roll 20, and the width of the channel is determined by the interval between thegrooves 21. Thus, the shape, width, and thickness of the channels for the evacuation of air, defined by the gaps between protrusions are controlled by changing the specifications for the grooves of the cooling roll according to use of the laminated film. - In the heat-sealable resin layer having such channels, it is typical that each channel ranges from about 40 to about 100 μm in depth, each protrusion and the base layer are about 150 to about 300 μm and about 30 to about 200 μm in thickness, respectively. However, the dimensions of the channel, the protrusion, and the base layer are set forth to illustrate, but are not to be construed to limit the dimensions.
- According to the present invention, the base layer may consist of one layer, or two or more layers. When employing a multilayer-structured base layer, it should be understood that a total thickness thereof is also adjusted within the allowable range for the base layer.
- With reference to
FIG. 10 , a bag for use in vacuum packages produced by using the film of the present invention is illustrated, in which the bag 50 for use in vacuum packages consists of afirst sheet 51 and asecond sheet 52 overlapping each other, and channels are formed on any one of thefirst sheet 51 and thesecond sheet 52. At this time, the heat-sealable resin layer and the base layer of each sheet are typically made of the same material as those of the other sheet, but they may also be made of different materials. The heat-sealable resin layer is used as an inner layer and the base layer is used as an outer layer. In addition, lower, left, and right edges of the first and the second sheet are bonded to each other so as to form a space for receiving a product to be vacuum packaged. In case of using the sheet on which channels are not formed, the sheet ranges from about 50 to about 150 gm in thickness. InFIG. 10 , channels with a predetermined pattern are formed on any one of the first sheet and the second sheet. However, it should be understand that a film, in which channels with a predetermined pattern are formed, may be useful as the material of both the first sheet and the second sheet of the bag for use in vacuum packages of this invention. Furthermore, various shapes of bags for use in vacuum packages can be prepared by using the laminated film having channels of the present invention. - A better understanding of the present invention may be obtained by reading the following examples which are set forth to illustrate, but are not to be construed to limit the present invention.
- A polyamide base layer with a width of 1200 mm and a thickness of 75 μm was fed to a laminating unit at a rate of 80 m/min, as shown in
FIG. 5 . A laminating roll and a cooling roll made of steel were 250 Φ and 500 Φ in diameter, respectively, and the depth of each groove on the cooling roll was 0:8 mm. The gap between the laminating roll and the cooling roll was 100, μm, and an extruder was positioned around the nip between the laminating roll and the cooling roll so that a melt-extruded polyethylene resin (CA-110 made by SK Corp.) at 220° C. was fed from a nozzle of the extruder to the laminating unit to produce a film for use in vacuum packages. At this time, the temperature of the cooling roll was −12° C. The film for use in vacuum packages thus produced comprised a base layer with a thickness of 75 μm, protrusions with a thickness of 250 μm, and channels with a depth of 25 μm, and was used as a first sheet. A second sheet was produced according to the same procedure as the first sheet, and combined with the first sheet to prepare a bag of 300×400 mm for use in vacuum packages. At this time, the second sheet does not have channels, and the base layer and the heat-sealable resin layer were 75 μm and 25 μm in thickness, respectively. Samples were put into the bag for use in vacuum packages, and tightly vacuum-packed by use of a vacuum packing machine (trade name: Foodsaver 550). 100 Samples thus packed were tested for 100 hours, and then the number of bags not maintaining a vacuum state was counted. The results are given in Table 1, below. - Performance of a bag for use in vacuum packages was evaluated according to the same procedure as example I except that commercial Foodsaver® made by Tilia Inc. was used as the bag. The results are described in Table 1, below.
- Performance of a bag for use in vacuum packages was evaluated according to the same procedure as example 1 except that commercial MAGIC VAC made by Flaemnouva Co. was used as the bag. The results are described in Table 1, below.
TABLE 1 Example 1 Com. Ex. 1 Com. Ex. 2 Number of bags not 0 20 5 maintaining vacuum - From the results of Table 1, it can be seen that the bag for use in vacuum packages according to example 1 of the present invention is much better than the conventional bags for use in vacuum packages in view of maintaining a vacuum state for an extended period.
- INDUSTRIAL APPLICABILITY
- According to a method of preparing a film for use in vacuum packages of the present invention, as described above, protrusions and channels are naturally formed on a heat-sealable resin layer by grooves of a cooling roll when a heat-sealable resin is layered on a gas-impermeable base. Therefore, the method is simple because of its ability to form air channels without the aid of additional embossing techniques, as well as being economically favorable owing to the employment of no embossing molds. Also, the freedom in patterning the grooves of the cooling roll makes it possible to form versatile air channel patterns and to easily control the intervals between the air channels, with an increase in productivity of about 50% compared to the conventional techniques.
- The present invention has been described in an illustrative manner, and it is to be understood that the terminology used is intended to be in the nature of description rather than of limitation. Many modifications and variations of the present invention are possible in light of the above teachings. Therefore, it is to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described.
Claims (8)
1. A method for preparing an air channel-equipped film for use in vacuum package, comprising the step of feeding a gas-impermeable base, along with a melt-extruded heat-sealable resin, to a laminating unit consisting of a laminating roll and a cooling roll to form a heat-sealable resin layer on a gas-impermeable base layer, said heat-sealable resin layer being molded and cooled in such a way that a plurality of protrusions, corresponding to a plurality of grooves formed in a predetermined pattern on a circumferential surface of the cooling roll, are formed on the heat-sealable resin layer, defining channels for the evacuation of air therebetween.
2. The method according to claim 1 , wherein the gas-impermeable base layer is made of a material selected from the group consisting of polyamide, polyester, and ethylene vinyl alcohol (EVOH).
3. The method according to claim 1 , wherein the heat-sealable resin layer is made of polyethylene.
4. The method according to claim 1 , wherein the grooves of the cooling roll are formed in an uneven pattern on the circumferential surface of the cooling roll.
5. The method according to claim 1 , wherein the grooves of the cooling roll are formed in a wave pattern on the circumferential surface of the cooling roll.
6. The method according to claim 1 , wherein the grooves of the cooling roll are formed in a stripe pattern on the circumferential surface of the cooling roll.
7. The method according to claim 2 , wherein the gas-impermeable base layer consists of single layer, or two or more layers.
8. A bag for use in vacuum packages, comprising a first sheet and a second sheet overlapping with each other, each of which is composed of a laminated film consisting of a gas-impermeable base layer as an outer layer and a heat-sealable resin layer as an inner layer, said first sheet and the second sheet being bonded to each other along lower, left, and right edges thereof so as to form a space for receiving a product to be vacuum packaged therein, wherein at least one of the first sheet and the second sheet is a film for use in vacuum packages produced according to the method of claim 1.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/241,205 US20060035046A1 (en) | 2001-02-21 | 2005-09-30 | Method for preparing air channel-equipped film for use in vacuum package |
Applications Claiming Priority (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR20010008724 | 2001-02-21 | ||
KR2002-9064 | 2002-02-20 | ||
KR10-2002-0009064A KR100444402B1 (en) | 2001-02-21 | 2002-02-20 | Preparation Method of Film for Vacuum Package Having Air Channels |
KR2001-8724 | 2002-02-21 | ||
US10/169,485 US7022058B2 (en) | 2001-02-21 | 2002-02-21 | Method for preparing air channel-equipped film for use in vacuum package |
PCT/KR2002/000283 WO2002074522A1 (en) | 2001-02-21 | 2002-02-21 | Method for preparing air channel-equipped film for use in vacuum package |
US11/241,205 US20060035046A1 (en) | 2001-02-21 | 2005-09-30 | Method for preparing air channel-equipped film for use in vacuum package |
Related Parent Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/169,485 Continuation US7022058B2 (en) | 2001-02-21 | 2002-02-21 | Method for preparing air channel-equipped film for use in vacuum package |
PCT/KR2002/000283 Continuation WO2002074522A1 (en) | 2001-02-21 | 2002-02-21 | Method for preparing air channel-equipped film for use in vacuum package |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060035046A1 true US20060035046A1 (en) | 2006-02-16 |
Family
ID=26638827
Family Applications (5)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/169,485 Expired - Lifetime US7022058B2 (en) | 2001-02-21 | 2002-02-21 | Method for preparing air channel-equipped film for use in vacuum package |
US11/066,413 Abandoned US20050143243A1 (en) | 2001-02-21 | 2005-02-24 | Method for preparing air channel-equipped film for use in vacuum package |
US11/069,430 Abandoned US20050147330A1 (en) | 2001-02-21 | 2005-02-28 | Vacuum packaging bags and multi-layer vacuum packaging film |
US11/069,498 Abandoned US20050147774A1 (en) | 2001-02-21 | 2005-02-28 | Bag roll for vacuum packaging applications |
US11/241,205 Abandoned US20060035046A1 (en) | 2001-02-21 | 2005-09-30 | Method for preparing air channel-equipped film for use in vacuum package |
Family Applications Before (4)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/169,485 Expired - Lifetime US7022058B2 (en) | 2001-02-21 | 2002-02-21 | Method for preparing air channel-equipped film for use in vacuum package |
US11/066,413 Abandoned US20050143243A1 (en) | 2001-02-21 | 2005-02-24 | Method for preparing air channel-equipped film for use in vacuum package |
US11/069,430 Abandoned US20050147330A1 (en) | 2001-02-21 | 2005-02-28 | Vacuum packaging bags and multi-layer vacuum packaging film |
US11/069,498 Abandoned US20050147774A1 (en) | 2001-02-21 | 2005-02-28 | Bag roll for vacuum packaging applications |
Country Status (9)
Country | Link |
---|---|
US (5) | US7022058B2 (en) |
EP (1) | EP1412167A4 (en) |
JP (1) | JP2004519356A (en) |
CN (1) | CN100429070C (en) |
AU (1) | AU2002234998B2 (en) |
CA (1) | CA2443888C (en) |
MX (1) | MXPA03007545A (en) |
TW (1) | TW530001B (en) |
WO (1) | WO2002074522A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7857515B2 (en) | 2007-06-15 | 2010-12-28 | S.C. Johnson Home Storage, Inc. | Airtight closure mechanism for a reclosable pouch |
US7874731B2 (en) | 2007-06-15 | 2011-01-25 | S.C. Johnson Home Storage, Inc. | Valve for a recloseable container |
US7887238B2 (en) | 2007-06-15 | 2011-02-15 | S.C. Johnson Home Storage, Inc. | Flow channels for a pouch |
US7946766B2 (en) | 2007-06-15 | 2011-05-24 | S.C. Johnson & Son, Inc. | Offset closure mechanism for a reclosable pouch |
US7967509B2 (en) | 2007-06-15 | 2011-06-28 | S.C. Johnson & Son, Inc. | Pouch with a valve |
US8397958B2 (en) | 2010-08-05 | 2013-03-19 | Ds Smith Plastics Limited | Closure valve assembly for a container |
Families Citing this family (54)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090305861A1 (en) * | 1997-06-19 | 2009-12-10 | Weder Donald E | Method for making distorted fragments |
WO2002074522A1 (en) * | 2001-02-21 | 2002-09-26 | Tilia International, Inc | Method for preparing air channel-equipped film for use in vacuum package |
US6991109B1 (en) | 2001-04-17 | 2006-01-31 | Foodfresh Technologies Llc | Vacuum sealable bag apparatus and method |
US7270238B2 (en) * | 2001-04-17 | 2007-09-18 | Foodfresh Technologies, Llc | Vacuum sealable bag apparatus and method |
US6799680B2 (en) * | 2002-04-05 | 2004-10-05 | The Holmes Group, Inc. | Vacuum sealed containers |
WO2003101705A1 (en) * | 2002-05-30 | 2003-12-11 | Flaem Nuova S.P.A. | Method of forming film for the construction of bags for vacuum packaging of products |
AU2003261641A1 (en) * | 2003-08-14 | 2005-03-07 | Wan Hyuk Yoon | Film with different heght of protuberances, manufacturing method and vacuum bag using thereof |
US20050220942A1 (en) * | 2004-03-15 | 2005-10-06 | Hongyu Wu | Easy to peal vacuum packaging bags |
US7938581B2 (en) * | 2004-04-22 | 2011-05-10 | Lau Kong Ping | Vacuum sealing bag |
US20050238263A1 (en) * | 2004-04-22 | 2005-10-27 | Ping Lau K | Vacuum sealing bag |
KR20050106536A (en) * | 2004-05-04 | 2005-11-10 | 바프렉스 주식회사 | Process for fabricating embossed multi-film for vacuum packaging and embossed multi-film for vacuum packaging fabricated by the method |
US7726880B2 (en) | 2004-06-29 | 2010-06-01 | The Glad Products Company | Flexible storage bag |
US8419279B2 (en) * | 2004-06-29 | 2013-04-16 | The Glad Products Company | Flexible storage bag |
US7534039B2 (en) * | 2004-07-22 | 2009-05-19 | Sunbeam Products, Inc. | Vacuum packaging films patterned with protruding cavernous structures |
US7290660B2 (en) * | 2004-07-23 | 2007-11-06 | Tilman Paul A | Storage system having a disposable vacuum bag |
US20070172157A1 (en) * | 2004-07-23 | 2007-07-26 | Alcoa Inc. | Polymeric package with resealable closure and valve and methods relating thereto |
US20070092167A1 (en) * | 2005-10-24 | 2007-04-26 | Paul Tilman | Polymeric Package With Resealable Closure And Valve, And Methods |
US20060072860A1 (en) * | 2004-09-17 | 2006-04-06 | Hongyu Wu | Multi-layer film for forming a vacuum packaging bag and method of manufacture |
US7972064B2 (en) | 2004-12-22 | 2011-07-05 | Cti Industries Corporation | One way valve and container |
US7597479B2 (en) * | 2005-01-20 | 2009-10-06 | The Glad Products Company | Storage bag with fluid separator |
US20080256901A1 (en) * | 2005-10-24 | 2008-10-23 | Reynolds Foil Inc, D/B/A Reynolds Consumer Products Company | Polymeric package with resealable closure and valve, and methods |
JP2007166299A (en) * | 2005-12-14 | 2007-06-28 | Sony Corp | Solid-state imaging element, color decomposition imaging optical system, and imaging device |
US20070297701A1 (en) * | 2006-01-19 | 2007-12-27 | Tiger Medical Products (Us), Inc. | Pill crusher pouch for use with a pill crusher |
US7594372B2 (en) * | 2006-03-14 | 2009-09-29 | Scholle Corporation | Flexible container forming apparatus having integrated web surface deformation |
US20070217718A1 (en) * | 2006-03-14 | 2007-09-20 | Kenneth Micnerski | Collapsible bag for dispensing liquids and method |
AU2007284251A1 (en) * | 2006-08-07 | 2008-02-21 | The Glad Products Company | Vacuum storage bag |
AT503972B1 (en) * | 2006-08-08 | 2010-01-15 | Unterland Flexible Packaging G | RETRACTABLE OR STRIPED PLASTIC FOIL AND METHOD FOR THE PRODUCTION THEREOF |
KR100755925B1 (en) * | 2006-08-21 | 2007-09-06 | 주식회사 락앤락 | Method for preparing air channel equipped film and bag |
US7857514B2 (en) | 2006-12-12 | 2010-12-28 | Reynolds Foil Inc. | Resealable closures, polymeric packages and systems and methods relating thereto |
EP2117994A1 (en) * | 2007-01-30 | 2009-11-18 | Advanced Technology Materials, Inc. | Prevention of liner choke-off in liner-based pressure dispensation system |
US7784160B2 (en) | 2007-03-16 | 2010-08-31 | S.C. Johnson & Son, Inc. | Pouch and airtight resealable closure mechanism therefor |
US7886412B2 (en) | 2007-03-16 | 2011-02-15 | S.C. Johnson Home Storage, Inc. | Pouch and airtight resealable closure mechanism therefor |
AU2008276353A1 (en) * | 2007-07-17 | 2009-01-22 | The Glad Products Company | Storage bag |
US20100205909A1 (en) * | 2007-07-24 | 2010-08-19 | Zimmerman Dean A | Storage bag |
EP2149447A1 (en) * | 2008-07-29 | 2010-02-03 | Alcan Technology & Management Ltd. | Method for producing a sheet of material with surface structure |
US8197138B2 (en) * | 2008-08-12 | 2012-06-12 | S.C. Johnson & Son, Inc. | Evacuable container and evacuation strip therefor |
US20100098354A1 (en) * | 2008-10-20 | 2010-04-22 | Fraser Robert W | Bag and Methods of Making the Same |
US9016945B2 (en) * | 2008-10-20 | 2015-04-28 | The Glad Products Company | Bag and method of making the same |
US20110268906A1 (en) * | 2008-12-31 | 2011-11-03 | Ausen Ronald W | Co-extrusion die, method of extruding with the die, and extruded articles made therefrom |
EP2669213A1 (en) | 2009-07-09 | 2013-12-04 | Advanced Technology Materials, Inc. | Liner-based storage system |
RU2540591C2 (en) * | 2010-04-15 | 2015-02-10 | Тетра Лаваль Холдингз Энд Файнэнс С.А. | Laminating roller, method for providing packing laminate and packing laminate |
US20120128836A1 (en) * | 2010-11-23 | 2012-05-24 | Flavorseal Llc | Pre-coated seasoning bags |
WO2012071370A2 (en) | 2010-11-23 | 2012-05-31 | Advanced Technology Materials, Inc. | Liner-based dispenser |
WO2012118527A1 (en) | 2011-03-01 | 2012-09-07 | Advanced Technology Materials, Inc. | Nested blow molded liner and overpack and methods of making same |
EP2748070A4 (en) | 2011-08-22 | 2015-11-18 | Advanced Tech Materials | Substantially rigid collapsible container with fold pattern |
SG11201405141TA (en) | 2012-02-24 | 2014-09-26 | Advanced Tech Materials | Fluid delivery system and method |
WO2014032024A1 (en) * | 2012-08-23 | 2014-02-27 | Waterview Innovation, Llc | Reusable multi-purpose bag formed of nonwoven fibrous material |
US9266647B2 (en) | 2012-08-23 | 2016-02-23 | Waterview Innovation, Llc | Reusable shopping bag having multiple secondary uses |
KR102272976B1 (en) | 2013-12-12 | 2021-07-06 | 쓰리엠 이노베이티브 프로퍼티즈 캄파니 | Method of making polymeric multilayer films |
CN111002676A (en) * | 2014-02-04 | 2020-04-14 | 古普里特·辛格·桑德哈 | Roofing membrane made of synthetic fiber fabric with anti-skid property |
KR20180073570A (en) | 2015-09-21 | 2018-07-02 | 플래버실 | Coated packaging products, systems and methods |
CN112895371A (en) * | 2018-08-09 | 2021-06-04 | 桐乡市凯瑞包装材料有限公司 | Manufacturing method of multipurpose easily-degradable improved storage bag |
CA3225346A1 (en) * | 2021-07-09 | 2023-01-12 | OAS Design Group, Inc. | Continuous process for forming domed paper and structures |
WO2023152647A1 (en) | 2022-02-09 | 2023-08-17 | Cryovac, Llc | Multilayer film, process of making the same, vacuum package and process of making said package |
Citations (98)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US274447A (en) * | 1883-03-20 | William-kentish | ||
US2105376A (en) * | 1936-12-18 | 1938-01-11 | Chase Bag Company | Valve bag |
US2633442A (en) * | 1949-03-08 | 1953-03-31 | Albert E Caldwell | Method of making tufted material |
US2670501A (en) * | 1951-08-24 | 1954-03-02 | Us Rubber Co | Method of forming plastic material |
US2776452A (en) * | 1952-09-03 | 1957-01-08 | Chavannes Ind Synthetics Inc | Apparatus for embossing thermoplastic film |
US2778173A (en) * | 1950-11-29 | 1957-01-22 | Wilts United Dairies Ltd | Method of producing airtight packages |
US2778171A (en) * | 1952-04-07 | 1957-01-22 | Wilts United Dairies Ltd | Production of air-tight packages |
US2789609A (en) * | 1952-03-14 | 1957-04-23 | Flexigrip Inc | Actuator for zippers and pouch embodying the same |
US2821338A (en) * | 1954-10-21 | 1958-01-28 | Melvin R Metzger | Valve-equipped container |
US3026231A (en) * | 1957-12-23 | 1962-03-20 | Sealed Air Corp | Method of making an embossed laminated structure |
US3077428A (en) * | 1956-06-29 | 1963-02-12 | Union Carbide Corp | Heat sealable polyethylene laminate and method of making same |
US3077262A (en) * | 1961-03-22 | 1963-02-12 | Poly Sil Inc | Novel container |
US3237844A (en) * | 1963-10-07 | 1966-03-01 | Ici Ltd | Bag closure |
US3251463A (en) * | 1961-11-04 | 1966-05-17 | Bodet Jean Augustin | Pellet package |
US3381887A (en) * | 1967-04-14 | 1968-05-07 | Nat Distillers Chem Corp | Sealing patch valve for plastic bags |
US3423231A (en) * | 1965-05-20 | 1969-01-21 | Ethyl Corp | Multilayer polymeric film |
US3565147A (en) * | 1968-11-27 | 1971-02-23 | Steven Ausnit | Plastic bag having reinforced closure |
US3575781A (en) * | 1969-05-16 | 1971-04-20 | Stauffer Hoechst Polymer Corp | Plastic film wrapping material |
US3661677A (en) * | 1969-10-10 | 1972-05-09 | Allied Chem | Post-heat treatment for polyvinylidene chloride-coated film |
US3785111A (en) * | 1972-02-04 | 1974-01-15 | Schneider W | Method of forming containers and packages |
US3799427A (en) * | 1972-12-04 | 1974-03-26 | L Goglio | Degassing valve for hermetically sealed flexible containers and a container provided with the valve |
US3809217A (en) * | 1969-07-22 | 1974-05-07 | Franklin Mint Corp | Packaging for flat objects |
US3937395A (en) * | 1973-07-30 | 1976-02-10 | British Visqueen Limited | Vented bags |
US3958693A (en) * | 1975-01-20 | 1976-05-25 | E-Z-Em Company Inc. | Vacuum X-ray envelope |
US3958391A (en) * | 1974-11-21 | 1976-05-25 | Kabushiki Kaisha Furukawa Seisakusho | Vacuum packaging method and apparatus |
US4018253A (en) * | 1975-10-09 | 1977-04-19 | Seth Ian Kaufman | Home vacuum apparatus for freezer bags |
US4066167A (en) * | 1976-07-08 | 1978-01-03 | Keebler Company | Recloseable package |
US4155453A (en) * | 1978-02-27 | 1979-05-22 | Ono Dan D | Inflatable grip container |
US4186786A (en) * | 1978-09-29 | 1980-02-05 | Union Carbide Corporation | Colored interlocking closure strips for a container |
US4310118A (en) * | 1979-08-10 | 1982-01-12 | C. I. Kasei Co. Ltd. | Packaging bags for powdery materials |
US4370187A (en) * | 1979-12-21 | 1983-01-25 | Mitsui Polychemicals Co. Ltd. | Process and apparatus for producing a laminated structure composed of a substrate web and a thermoplastic resin web extrusion-coated thereon |
US4372921A (en) * | 1980-01-28 | 1983-02-08 | Sanderson Roger S | Sterilized storage container |
US4449243A (en) * | 1981-09-10 | 1984-05-15 | Cafes Collet | Vacuum package bag |
US4569712A (en) * | 1982-11-12 | 1986-02-11 | Sanyo Kokusaku Pulp Co., Ltd. | Process for producing support for use in formation of polyurethan films |
US4575990A (en) * | 1982-01-19 | 1986-03-18 | W. R. Grace & Co., Cryovac Div. | Shrink packaging process |
US4576283A (en) * | 1983-01-25 | 1986-03-18 | Bernard Fafournoux | Bag for vacuum packaging of articles |
US4576285A (en) * | 1983-05-20 | 1986-03-18 | Fres-Co System Usa, Inc. | Sealed flexible container with non-destructive peelable opening and apparatus and method for forming same |
US4579756A (en) * | 1984-08-13 | 1986-04-01 | Edgel Rex D | Insulation material with vacuum compartments |
US4583347A (en) * | 1982-10-07 | 1986-04-22 | W. R. Grace & Co., Cryovac Div. | Vacuum packaging apparatus and process |
US4658434A (en) * | 1986-05-29 | 1987-04-14 | Grain Security Foundation Ltd. | Laminates and laminated articles |
US4669124A (en) * | 1984-05-23 | 1987-05-26 | Yoken Co., Ltd. | Beverage container with tamperproof screwthread cap |
US4747702A (en) * | 1983-06-30 | 1988-05-31 | First Brands Corporation | Interlocking closure device having controlled separation and improved ease of occlusion |
US4812056A (en) * | 1985-03-25 | 1989-03-14 | The Dow Chemical Company | Reclosable, flexible container having an externally operated fastener |
US4834554A (en) * | 1987-11-16 | 1989-05-30 | J. C. Brock Corp. | Plastic bag with integral venting structure |
US4890637A (en) * | 1988-12-12 | 1990-01-02 | Flavorcoffee Co. Inc. | One way valve |
US4892414A (en) * | 1988-07-05 | 1990-01-09 | Minigrip, Inc. | Bags with reclosable plastic fastener having automatic sealing gasket means |
US4903718A (en) * | 1988-10-19 | 1990-02-27 | Ipco Corporation | Flexible ultrasonic cleaning bag |
US4906108A (en) * | 1989-03-08 | 1990-03-06 | Mobil Oil Corporation | Corrugated sticky tape bag tie closure |
US4913561A (en) * | 1988-11-15 | 1990-04-03 | Fres-Co System Usa, Inc. | Gussetted flexible package with presealed portions and method of making the same |
US4917844A (en) * | 1987-04-01 | 1990-04-17 | Fuji Photo Film Co., Ltd. | Method of manufacturing laminate product |
US4917506A (en) * | 1983-06-30 | 1990-04-17 | First Brands Corporation | Interlocking closure device having controlled separation and improved ease of occlusion |
US5006056A (en) * | 1989-09-01 | 1991-04-09 | The Black Clawson Company | Film extrusion apparatus including a quickly replaceable chill roll |
US5080155A (en) * | 1990-12-28 | 1992-01-14 | Hooleon Corporation | Keyboard enclosure |
US5097956A (en) * | 1988-09-07 | 1992-03-24 | Paramount Packaging Corporation | Vacuum package with smooth surface and method of making same |
US5098497A (en) * | 1989-02-23 | 1992-03-24 | Anthony Industries, Inc. | Process for preparing embossed, coated paper |
US5106688A (en) * | 1988-05-20 | 1992-04-21 | W. R. Grace & Co.-Conn. | Multi-layer packaging film and process |
US5111838A (en) * | 1991-11-25 | 1992-05-12 | Shipping Systems, Inc. | Dunnage bag air valve and coupling |
US5116444A (en) * | 1991-05-30 | 1992-05-26 | Sealed Air Corporation | Apparatus and method for enhancing lamination of plastic films |
US5203458A (en) * | 1992-03-02 | 1993-04-20 | Quality Containers International, Inc. | Cryptoplate disposable surgical garment container |
US5209264A (en) * | 1991-07-05 | 1993-05-11 | Yoshihiro Koyanagi | Check valve |
US5397182A (en) * | 1993-10-13 | 1995-03-14 | Reynolds Consumer Products Inc. | Write-on profile strips for recloseable plastic storage bags |
US5402906A (en) * | 1992-07-16 | 1995-04-04 | Brown; Richard S. | Fresh produce container system |
USRE34929E (en) * | 1985-09-23 | 1995-05-09 | Tilia, Inc. | Plastic bag for vacuum sealing |
US5480030A (en) * | 1993-12-15 | 1996-01-02 | New West Products, Inc. | Reusable, evacuable enclosure for storage of clothing and the like |
US5592697A (en) * | 1995-04-18 | 1997-01-14 | Young; Russell | Waterproof pocket |
US5620098A (en) * | 1994-06-08 | 1997-04-15 | Southern California Foam, Inc. | Full recovery reduced-volume packaging system |
US5709467A (en) * | 1996-06-18 | 1998-01-20 | Galliano, Ii; Carol J. | Device and apparatus for mixing alginate |
US5735395A (en) * | 1996-06-28 | 1998-04-07 | Lo; Luke | Airtight garment hanging bag |
US5749493A (en) * | 1983-10-17 | 1998-05-12 | The Coca-Cola Company | Conduit member for collapsible container |
US5874155A (en) * | 1995-06-07 | 1999-02-23 | American National Can Company | Easy-opening flexible packaging laminates and packaging materials made therefrom |
US5873217A (en) * | 1997-05-09 | 1999-02-23 | Smith; George E. | Vacuum sealing methods and apparatus |
US5881881A (en) * | 1997-06-16 | 1999-03-16 | Carrington; Thomas | Evacuateable bag |
US5893822A (en) * | 1997-10-22 | 1999-04-13 | Keystone Mfg. Co., Inc. | System for vacuum evacuation and sealing of plastic bags |
US5898113A (en) * | 1997-07-30 | 1999-04-27 | Bellaire Industries, Inc. | Multi-ply material sealed container |
US6021624A (en) * | 1990-04-27 | 2000-02-08 | Kapak Corporation | Vented pouch arrangement and method |
US6029810A (en) * | 1997-10-17 | 2000-02-29 | Chen; Shu-Ling | Dress bag and hanger assembly |
US6030652A (en) * | 1997-08-05 | 2000-02-29 | Hanus; John | Food bag featuring gusset opening, method of making the food bag, and method of using the food bag |
US6035769A (en) * | 1997-04-16 | 2000-03-14 | Hikari Kinzoku Industry Co., Ltd. | Method for preserving cooked food and vacuum sealed preservation container therefor |
US6039182A (en) * | 1998-08-13 | 2000-03-21 | Light; Barry | Bag |
US6045264A (en) * | 1998-01-29 | 2000-04-04 | Miniea; Stephen H. | Self-sealing, disposable storage bag |
US6045006A (en) * | 1998-06-02 | 2000-04-04 | The Coca-Cola Company | Disposable liquid containing and dispensing package and an apparatus for its manufacture |
US6053606A (en) * | 1996-10-07 | 2000-04-25 | Seiko Epson Corporation | Ink cartridge |
US6059457A (en) * | 1998-01-02 | 2000-05-09 | Com-Pac International, Inc. | Evacuable storage bag with integral zipper seal |
USD425786S (en) * | 1998-05-04 | 2000-05-30 | Voller Ronald L | Multi ply reinforced dunnage bag and valve therefor |
US6202849B1 (en) * | 1999-07-07 | 2001-03-20 | David B. Graham | Evacuatable rigid storage unit for storing compressible articles therein |
US6220702B1 (en) * | 1998-12-24 | 2001-04-24 | Seiko Epson Corporation | Ink bag for ink jet type recording apparatus and package suitable for packing such ink bag |
US6224528B1 (en) * | 1997-04-11 | 2001-05-01 | Kapak Corporation | Method for making bag constructions having inwardly directed side seal portions |
US6227706B1 (en) * | 2000-06-26 | 2001-05-08 | Thoai S. Tran | Two piece, compressible storage satchel for compressible articles |
US6231236B1 (en) * | 1998-07-28 | 2001-05-15 | Reynolds Consumer Products, Inc. | Resealable package having venting structure and methods |
US6231234B1 (en) * | 1998-05-13 | 2001-05-15 | Tc Manufacturing Co., Inc. | One piece snap closure for a plastic bag |
US6357915B2 (en) * | 1999-08-13 | 2002-03-19 | New West Products, Inc. | Storage bag with one-way air valve |
US6520071B1 (en) * | 1999-05-21 | 2003-02-18 | Aracaria B. . | Hand-held suction pump |
US6568931B2 (en) * | 1996-06-26 | 2003-05-27 | Idemitsu Petrochemical Co., Ltd. | Emboss pattern processing apparatus |
US20040000503A1 (en) * | 2002-06-28 | 2004-01-01 | Shah Ketan N. | Recloseable storage bag with porous evacuation portal |
US20040000502A1 (en) * | 2002-06-28 | 2004-01-01 | Shah Ketan N. | Recloseable storage bag with user-deformable air vent |
US20040000501A1 (en) * | 2002-06-28 | 2004-01-01 | Shah Ketan N. | Recloseable storage bag with secondary closure members |
US20040007494A1 (en) * | 2002-07-15 | 2004-01-15 | Popeil Ronald M. | Apparatus and method to more effectively vacuum package foods and other objects |
US7022058B2 (en) * | 2001-02-21 | 2006-04-04 | Tilia International, Inc. | Method for preparing air channel-equipped film for use in vacuum package |
Family Cites Families (77)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US27447A (en) * | 1860-03-13 | Chain for timbee-behdiug machines | ||
US474702A (en) * | 1892-05-10 | James e | ||
NL22408C (en) | 1927-06-02 | |||
US2085766A (en) | 1934-09-29 | 1937-07-06 | Potdevin Machine Co | Method of making bags and the like |
US2429482A (en) | 1939-04-06 | 1947-10-21 | Munters Carl Georg | Method and means for the production of foil material |
US2265075A (en) | 1939-12-06 | 1941-12-02 | Thomas M Royal & Company | Method of making bags |
US2387812A (en) | 1941-12-18 | 1945-10-30 | Stokes & Smith Co | System of producing evacuated packages |
US2480316A (en) | 1944-11-11 | 1949-08-30 | Mishawaka Rubber & Woolen Mfg | Method of making laminated cushion material |
US2609314A (en) | 1946-10-30 | 1952-09-02 | Glenn L Martin Co | Machine for making honeycomb core material |
US2642372A (en) | 1950-02-02 | 1953-06-16 | Chittick Charles Yardley | Flexible corrugated sheet material and method of fabricating same |
US2607712A (en) | 1952-01-28 | 1952-08-19 | Frank W Egan & Company | Extrusion coating machine |
US2772712A (en) | 1952-03-14 | 1956-12-04 | Flexigrip Inc | Actuator for zippers and pouch embodying the same |
US2759866A (en) | 1952-12-17 | 1956-08-21 | Gen Tire & Rubber Co | Method of making wall covering |
US2690206A (en) | 1953-03-23 | 1954-09-28 | Marathon Corp | Extrusion coating machine |
US2695741A (en) | 1953-06-16 | 1954-11-30 | Stephen L Haley | Air evacuator for plastic bags |
US2858247A (en) | 1955-08-04 | 1958-10-28 | Swart Dev Company De | Panel material |
US2916411A (en) | 1955-11-03 | 1959-12-08 | Fiammiferi Ed Affini Spa Fab | Composite packing paper |
US2856323A (en) | 1955-11-09 | 1958-10-14 | Jack C Gordon | Indented resilient matted fibrous pad |
US2913030A (en) | 1956-10-22 | 1959-11-17 | Arnold J Fisher | Moisture-free bag |
US2960144A (en) | 1958-05-21 | 1960-11-15 | Edwards Eng Corp | Corrugating machines |
US3023231A (en) * | 1958-11-28 | 1962-02-27 | Phillips Petroleum Co | Production of calcium petroleum sulfonates |
US3142599A (en) | 1959-11-27 | 1964-07-28 | Sealed Air Corp | Method for making laminated cushioning material |
US3102676A (en) | 1960-02-16 | 1963-09-03 | Montedison Spa | Self-closing containers |
US3060985A (en) | 1960-08-05 | 1962-10-30 | John R Vance | Bag closure |
US3098563A (en) | 1960-10-03 | 1963-07-23 | Hugh B Skees | Inflatable heat insulating material |
US3149772A (en) | 1960-12-07 | 1964-09-22 | Technipak Proprietary Ltd | Self sealing sachets or containers |
US3113715A (en) | 1961-02-03 | 1963-12-10 | Dow Chemical Co | Anti-block edge for plastic bags and the like |
US3237644A (en) * | 1962-09-07 | 1966-03-01 | Robertshaw Controls Co | Rotary valving mechanism |
US3141221A (en) | 1962-11-13 | 1964-07-21 | Amtec Inc | Closure for flexible bags |
US3160323A (en) | 1963-04-05 | 1964-12-08 | Leonard R Weisberg | Containers with internal, interlocking protrusions |
US3135411A (en) | 1963-05-09 | 1964-06-02 | Wiley W Osborne | Vacuum sealing means |
US3595722A (en) | 1964-04-17 | 1971-07-27 | Thiokol Chemical Corp | Process for forming a thermoplastic product |
US3224574A (en) | 1964-06-10 | 1965-12-21 | Scott Paper Co | Embossed plastic bag |
US3227574A (en) * | 1965-05-20 | 1966-01-04 | Textile Rubber & Chem Co | Tufted scatter rugs with double coated skid-resistant backing and method of preparing same |
US3325084A (en) | 1965-10-18 | 1967-06-13 | Ausnit Steven | Pressure closable fastener |
US3334805A (en) | 1965-10-22 | 1967-08-08 | Robert W Halbach | Plastic bag closure |
US3411698A (en) | 1966-09-09 | 1968-11-19 | Reynolds Metals Co | Bag-like container means |
AT276220B (en) * | 1967-05-18 | 1969-11-25 | Natron Papier Ind Ges M B H | Method for producing a packaging material, in particular for sacks |
US3595467A (en) | 1968-01-23 | 1971-07-27 | Luigi Goglio | Flexible sealed container provided with a one-way safety valve |
US3516217A (en) | 1968-03-07 | 1970-06-23 | Bemis Co Inc | Compression packaging |
US3595740A (en) | 1968-05-08 | 1971-07-27 | Du Pont | Hydrolyzed ethylene/vinyl acetate copolymer as oxygen barrier layer |
US3533548A (en) | 1968-10-17 | 1970-10-13 | Bard Inc C R | Method of ascertaining validity of heat seal and product of said method |
US3600267A (en) | 1969-04-14 | 1971-08-17 | Dow Chemical Co | Packaging film |
CA984346A (en) | 1971-03-24 | 1976-02-24 | Canadian Industries Limited | Valve bag |
US3908070A (en) | 1972-04-24 | 1975-09-23 | Dow Chemical Co | Multilayer thermoplastic barrier structure |
US4098404A (en) | 1973-02-23 | 1978-07-04 | Sonoco Products Company | Vacuum package with flexible end |
US3895153A (en) | 1973-10-05 | 1975-07-15 | Minnesota Mining & Mfg | Friction-surface sheet |
US4105491A (en) | 1975-02-21 | 1978-08-08 | Mobil Oil Corporation | Process and apparatus for the manufacture of embossed film laminations |
US3997383A (en) | 1975-03-10 | 1976-12-14 | W. R. Grace & Co. | Cross-linked amide/olefin polymeric laminates |
US3980226A (en) | 1975-05-05 | 1976-09-14 | Franz Charles F | Evacuateable bag |
US3998499A (en) | 1975-12-18 | 1976-12-21 | Forniture Industriali Padova - S.P.A. | Steel bearings with polychloroprene and fluorocarbon resin |
US4340558A (en) * | 1976-05-05 | 1982-07-20 | Colgate-Palmolive Company | Scrim reinforced plastic film |
US4132347A (en) * | 1976-07-07 | 1979-01-02 | Showa Seitai Kogyo Kaisha Ltd. | Moisture proof bags provided with blow-in ports and method of manufacturing the same |
IT1067343B (en) | 1976-11-19 | 1985-03-16 | Bernardo P Di | METHOD AND DEVICE FOR THE VACUUM PACKAGING OF PRODUCTS |
FR2409205A2 (en) | 1977-11-17 | 1979-06-15 | Est Imprimerie Papeterie | DEAERATION VALVE FOR BAGGING PULVERULENT PRODUCTS |
US4212337A (en) | 1978-03-31 | 1980-07-15 | Union Carbide Corporation | Closure fastening device |
US4179862A (en) | 1978-06-19 | 1979-12-25 | Inauen Maschinen Ag | Vacuum packing machine with bag end retractor |
DE2934126A1 (en) | 1978-09-07 | 1980-03-20 | Matburn Holdings Ltd | SEALING DEVICE FOR A BAG, SACK OR THE LIKE. |
US4295566A (en) | 1980-05-07 | 1981-10-20 | Becton, Dickinson And Company | Air-evacuated package with vacuum integrity indicator means |
US4407879A (en) * | 1981-08-07 | 1983-10-04 | Northern Petrochemical Company | Method of producing a textured film |
US4622036A (en) * | 1982-04-05 | 1986-11-11 | Ethyl Corporation | Porous film and absorptive structure |
US4551379A (en) | 1983-08-31 | 1985-11-05 | Kerr Stanley R | Inflatable packaging material |
NZ209507A (en) | 1983-10-06 | 1986-07-11 | Canadian Ind | Thermoplastic valve bag:perforated outer wall with mesh inner liner |
US4532652A (en) | 1983-11-16 | 1985-07-30 | Mobil Oil Corporation | Plastic bag with air exhaustion valve |
US4705174A (en) | 1984-02-29 | 1987-11-10 | Fres-Co System Usa, Inc. | Sealed flexible container with non-destructive peelable opening |
IT1176180B (en) | 1984-05-23 | 1987-08-18 | Eurodomestici Ind Riunite | METHOD FOR THE VACUUM PACKAGING OF FINALLY DIVIDED MATERIALS AND CONTAINER FOR THE IMPLEMENTATION OF THE METHOD |
CA1253592A (en) * | 1985-02-15 | 1989-05-02 | Tatsuya Tsuda | Heating apparatus with humidity sensor |
US4756422A (en) | 1985-09-23 | 1988-07-12 | Kristen Hanns J | Plastic bag for vacuum sealing |
US4841603A (en) * | 1986-12-22 | 1989-06-27 | Minigrip, Inc. | Reclosable seams for fluid-tight applications |
US4712574A (en) | 1987-04-23 | 1987-12-15 | C. H. Perrott, Inc. | Vacuum-breaking valve for pressurized fluid lines |
CA1330285C (en) * | 1987-12-22 | 1994-06-21 | Geoffrey S. Martin | Triple lumen catheter |
US5121590A (en) * | 1990-06-04 | 1992-06-16 | Scanlan Gregory P | Vacuum packing apparatus |
FI86477C (en) * | 1991-02-28 | 1992-08-25 | Neste Oy | FOERVARINGS- OCH TRANSPORTFOERPACKNING AV PLAST FOER LOESPATRONER. |
DE4112900A1 (en) * | 1991-03-22 | 1992-09-24 | Windmoeller & Hoelscher | METHOD FOR PRODUCING A SACK OR BAG WITH RECTANGULAR BOTTOM IN FILLED CONDITION AND WITH A HANDLE AND A SACK OR BAG PRODUCED BY THIS METHOD |
IT231279Y1 (en) * | 1993-10-13 | 1999-08-02 | Abate Luigi | TUBULAR ELEMENT FOR THE FORMATION OF BAGS FOR THE PACKAGING OF VACUUM PRODUCTS |
US6035969A (en) * | 1998-08-25 | 2000-03-14 | Pyle; Gary Lee | Grease gun extension coupling device |
US6319456B1 (en) * | 1998-11-12 | 2001-11-20 | Certainteed Corporation | Method for continuous vacuum forming shaped polymeric articles |
-
2002
- 2002-02-21 WO PCT/KR2002/000283 patent/WO2002074522A1/en active IP Right Grant
- 2002-02-21 CN CNB028084101A patent/CN100429070C/en not_active Expired - Fee Related
- 2002-02-21 US US10/169,485 patent/US7022058B2/en not_active Expired - Lifetime
- 2002-02-21 EP EP02701765A patent/EP1412167A4/en not_active Withdrawn
- 2002-02-21 AU AU2002234998A patent/AU2002234998B2/en not_active Ceased
- 2002-02-21 CA CA002443888A patent/CA2443888C/en not_active Expired - Lifetime
- 2002-02-21 MX MXPA03007545A patent/MXPA03007545A/en active IP Right Grant
- 2002-02-21 JP JP2002573215A patent/JP2004519356A/en active Pending
- 2002-08-09 TW TW091117967A patent/TW530001B/en not_active IP Right Cessation
-
2005
- 2005-02-24 US US11/066,413 patent/US20050143243A1/en not_active Abandoned
- 2005-02-28 US US11/069,430 patent/US20050147330A1/en not_active Abandoned
- 2005-02-28 US US11/069,498 patent/US20050147774A1/en not_active Abandoned
- 2005-09-30 US US11/241,205 patent/US20060035046A1/en not_active Abandoned
Patent Citations (100)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US274447A (en) * | 1883-03-20 | William-kentish | ||
US2105376A (en) * | 1936-12-18 | 1938-01-11 | Chase Bag Company | Valve bag |
US2633442A (en) * | 1949-03-08 | 1953-03-31 | Albert E Caldwell | Method of making tufted material |
US2778173A (en) * | 1950-11-29 | 1957-01-22 | Wilts United Dairies Ltd | Method of producing airtight packages |
US2670501A (en) * | 1951-08-24 | 1954-03-02 | Us Rubber Co | Method of forming plastic material |
US2789609A (en) * | 1952-03-14 | 1957-04-23 | Flexigrip Inc | Actuator for zippers and pouch embodying the same |
US2778171A (en) * | 1952-04-07 | 1957-01-22 | Wilts United Dairies Ltd | Production of air-tight packages |
US2776452A (en) * | 1952-09-03 | 1957-01-08 | Chavannes Ind Synthetics Inc | Apparatus for embossing thermoplastic film |
US2821338A (en) * | 1954-10-21 | 1958-01-28 | Melvin R Metzger | Valve-equipped container |
US3077428A (en) * | 1956-06-29 | 1963-02-12 | Union Carbide Corp | Heat sealable polyethylene laminate and method of making same |
US3026231A (en) * | 1957-12-23 | 1962-03-20 | Sealed Air Corp | Method of making an embossed laminated structure |
US3077262A (en) * | 1961-03-22 | 1963-02-12 | Poly Sil Inc | Novel container |
US3251463A (en) * | 1961-11-04 | 1966-05-17 | Bodet Jean Augustin | Pellet package |
US3237844A (en) * | 1963-10-07 | 1966-03-01 | Ici Ltd | Bag closure |
US3423231A (en) * | 1965-05-20 | 1969-01-21 | Ethyl Corp | Multilayer polymeric film |
US3381887A (en) * | 1967-04-14 | 1968-05-07 | Nat Distillers Chem Corp | Sealing patch valve for plastic bags |
US3565147A (en) * | 1968-11-27 | 1971-02-23 | Steven Ausnit | Plastic bag having reinforced closure |
US3575781A (en) * | 1969-05-16 | 1971-04-20 | Stauffer Hoechst Polymer Corp | Plastic film wrapping material |
US3809217A (en) * | 1969-07-22 | 1974-05-07 | Franklin Mint Corp | Packaging for flat objects |
US3661677A (en) * | 1969-10-10 | 1972-05-09 | Allied Chem | Post-heat treatment for polyvinylidene chloride-coated film |
US3785111A (en) * | 1972-02-04 | 1974-01-15 | Schneider W | Method of forming containers and packages |
US3799427A (en) * | 1972-12-04 | 1974-03-26 | L Goglio | Degassing valve for hermetically sealed flexible containers and a container provided with the valve |
US3799427B1 (en) * | 1972-12-04 | 1987-02-03 | ||
US3937395A (en) * | 1973-07-30 | 1976-02-10 | British Visqueen Limited | Vented bags |
US3958391A (en) * | 1974-11-21 | 1976-05-25 | Kabushiki Kaisha Furukawa Seisakusho | Vacuum packaging method and apparatus |
US3958693A (en) * | 1975-01-20 | 1976-05-25 | E-Z-Em Company Inc. | Vacuum X-ray envelope |
US4018253A (en) * | 1975-10-09 | 1977-04-19 | Seth Ian Kaufman | Home vacuum apparatus for freezer bags |
US4066167A (en) * | 1976-07-08 | 1978-01-03 | Keebler Company | Recloseable package |
US4155453A (en) * | 1978-02-27 | 1979-05-22 | Ono Dan D | Inflatable grip container |
US4186786A (en) * | 1978-09-29 | 1980-02-05 | Union Carbide Corporation | Colored interlocking closure strips for a container |
US4310118A (en) * | 1979-08-10 | 1982-01-12 | C. I. Kasei Co. Ltd. | Packaging bags for powdery materials |
US4370187A (en) * | 1979-12-21 | 1983-01-25 | Mitsui Polychemicals Co. Ltd. | Process and apparatus for producing a laminated structure composed of a substrate web and a thermoplastic resin web extrusion-coated thereon |
US4372921A (en) * | 1980-01-28 | 1983-02-08 | Sanderson Roger S | Sterilized storage container |
US4449243A (en) * | 1981-09-10 | 1984-05-15 | Cafes Collet | Vacuum package bag |
US4575990A (en) * | 1982-01-19 | 1986-03-18 | W. R. Grace & Co., Cryovac Div. | Shrink packaging process |
US4583347A (en) * | 1982-10-07 | 1986-04-22 | W. R. Grace & Co., Cryovac Div. | Vacuum packaging apparatus and process |
US4569712A (en) * | 1982-11-12 | 1986-02-11 | Sanyo Kokusaku Pulp Co., Ltd. | Process for producing support for use in formation of polyurethan films |
US4576283A (en) * | 1983-01-25 | 1986-03-18 | Bernard Fafournoux | Bag for vacuum packaging of articles |
US4576285A (en) * | 1983-05-20 | 1986-03-18 | Fres-Co System Usa, Inc. | Sealed flexible container with non-destructive peelable opening and apparatus and method for forming same |
US4747702A (en) * | 1983-06-30 | 1988-05-31 | First Brands Corporation | Interlocking closure device having controlled separation and improved ease of occlusion |
US4917506A (en) * | 1983-06-30 | 1990-04-17 | First Brands Corporation | Interlocking closure device having controlled separation and improved ease of occlusion |
US5749493A (en) * | 1983-10-17 | 1998-05-12 | The Coca-Cola Company | Conduit member for collapsible container |
US4669124A (en) * | 1984-05-23 | 1987-05-26 | Yoken Co., Ltd. | Beverage container with tamperproof screwthread cap |
US4579756A (en) * | 1984-08-13 | 1986-04-01 | Edgel Rex D | Insulation material with vacuum compartments |
US4812056A (en) * | 1985-03-25 | 1989-03-14 | The Dow Chemical Company | Reclosable, flexible container having an externally operated fastener |
USRE34929E (en) * | 1985-09-23 | 1995-05-09 | Tilia, Inc. | Plastic bag for vacuum sealing |
US4658434A (en) * | 1986-05-29 | 1987-04-14 | Grain Security Foundation Ltd. | Laminates and laminated articles |
US4917844A (en) * | 1987-04-01 | 1990-04-17 | Fuji Photo Film Co., Ltd. | Method of manufacturing laminate product |
US4834554A (en) * | 1987-11-16 | 1989-05-30 | J. C. Brock Corp. | Plastic bag with integral venting structure |
US5106688A (en) * | 1988-05-20 | 1992-04-21 | W. R. Grace & Co.-Conn. | Multi-layer packaging film and process |
US4892414A (en) * | 1988-07-05 | 1990-01-09 | Minigrip, Inc. | Bags with reclosable plastic fastener having automatic sealing gasket means |
US5097956A (en) * | 1988-09-07 | 1992-03-24 | Paramount Packaging Corporation | Vacuum package with smooth surface and method of making same |
US4903718A (en) * | 1988-10-19 | 1990-02-27 | Ipco Corporation | Flexible ultrasonic cleaning bag |
US4913561A (en) * | 1988-11-15 | 1990-04-03 | Fres-Co System Usa, Inc. | Gussetted flexible package with presealed portions and method of making the same |
US4890637A (en) * | 1988-12-12 | 1990-01-02 | Flavorcoffee Co. Inc. | One way valve |
US5098497A (en) * | 1989-02-23 | 1992-03-24 | Anthony Industries, Inc. | Process for preparing embossed, coated paper |
US4906108A (en) * | 1989-03-08 | 1990-03-06 | Mobil Oil Corporation | Corrugated sticky tape bag tie closure |
US5006056A (en) * | 1989-09-01 | 1991-04-09 | The Black Clawson Company | Film extrusion apparatus including a quickly replaceable chill roll |
US6023914A (en) * | 1990-04-27 | 2000-02-15 | Kapak Corporation | Vented pouch arrangement and method |
US6021624A (en) * | 1990-04-27 | 2000-02-08 | Kapak Corporation | Vented pouch arrangement and method |
US5080155A (en) * | 1990-12-28 | 1992-01-14 | Hooleon Corporation | Keyboard enclosure |
US5116444A (en) * | 1991-05-30 | 1992-05-26 | Sealed Air Corporation | Apparatus and method for enhancing lamination of plastic films |
US5209264A (en) * | 1991-07-05 | 1993-05-11 | Yoshihiro Koyanagi | Check valve |
US5111838A (en) * | 1991-11-25 | 1992-05-12 | Shipping Systems, Inc. | Dunnage bag air valve and coupling |
US5203458A (en) * | 1992-03-02 | 1993-04-20 | Quality Containers International, Inc. | Cryptoplate disposable surgical garment container |
US5402906A (en) * | 1992-07-16 | 1995-04-04 | Brown; Richard S. | Fresh produce container system |
US5397182A (en) * | 1993-10-13 | 1995-03-14 | Reynolds Consumer Products Inc. | Write-on profile strips for recloseable plastic storage bags |
US5480030A (en) * | 1993-12-15 | 1996-01-02 | New West Products, Inc. | Reusable, evacuable enclosure for storage of clothing and the like |
US5620098A (en) * | 1994-06-08 | 1997-04-15 | Southern California Foam, Inc. | Full recovery reduced-volume packaging system |
US5592697A (en) * | 1995-04-18 | 1997-01-14 | Young; Russell | Waterproof pocket |
US5874155A (en) * | 1995-06-07 | 1999-02-23 | American National Can Company | Easy-opening flexible packaging laminates and packaging materials made therefrom |
US5709467A (en) * | 1996-06-18 | 1998-01-20 | Galliano, Ii; Carol J. | Device and apparatus for mixing alginate |
US6568931B2 (en) * | 1996-06-26 | 2003-05-27 | Idemitsu Petrochemical Co., Ltd. | Emboss pattern processing apparatus |
US5735395A (en) * | 1996-06-28 | 1998-04-07 | Lo; Luke | Airtight garment hanging bag |
US6053606A (en) * | 1996-10-07 | 2000-04-25 | Seiko Epson Corporation | Ink cartridge |
US6224528B1 (en) * | 1997-04-11 | 2001-05-01 | Kapak Corporation | Method for making bag constructions having inwardly directed side seal portions |
US6035769A (en) * | 1997-04-16 | 2000-03-14 | Hikari Kinzoku Industry Co., Ltd. | Method for preserving cooked food and vacuum sealed preservation container therefor |
US5873217A (en) * | 1997-05-09 | 1999-02-23 | Smith; George E. | Vacuum sealing methods and apparatus |
US5881881A (en) * | 1997-06-16 | 1999-03-16 | Carrington; Thomas | Evacuateable bag |
US5898113A (en) * | 1997-07-30 | 1999-04-27 | Bellaire Industries, Inc. | Multi-ply material sealed container |
US6030652A (en) * | 1997-08-05 | 2000-02-29 | Hanus; John | Food bag featuring gusset opening, method of making the food bag, and method of using the food bag |
US6029810A (en) * | 1997-10-17 | 2000-02-29 | Chen; Shu-Ling | Dress bag and hanger assembly |
US5893822A (en) * | 1997-10-22 | 1999-04-13 | Keystone Mfg. Co., Inc. | System for vacuum evacuation and sealing of plastic bags |
US6059457A (en) * | 1998-01-02 | 2000-05-09 | Com-Pac International, Inc. | Evacuable storage bag with integral zipper seal |
US6045264A (en) * | 1998-01-29 | 2000-04-04 | Miniea; Stephen H. | Self-sealing, disposable storage bag |
USD425786S (en) * | 1998-05-04 | 2000-05-30 | Voller Ronald L | Multi ply reinforced dunnage bag and valve therefor |
US6231234B1 (en) * | 1998-05-13 | 2001-05-15 | Tc Manufacturing Co., Inc. | One piece snap closure for a plastic bag |
US6045006A (en) * | 1998-06-02 | 2000-04-04 | The Coca-Cola Company | Disposable liquid containing and dispensing package and an apparatus for its manufacture |
US6231236B1 (en) * | 1998-07-28 | 2001-05-15 | Reynolds Consumer Products, Inc. | Resealable package having venting structure and methods |
US6039182A (en) * | 1998-08-13 | 2000-03-21 | Light; Barry | Bag |
US6220702B1 (en) * | 1998-12-24 | 2001-04-24 | Seiko Epson Corporation | Ink bag for ink jet type recording apparatus and package suitable for packing such ink bag |
US6520071B1 (en) * | 1999-05-21 | 2003-02-18 | Aracaria B. . | Hand-held suction pump |
US6202849B1 (en) * | 1999-07-07 | 2001-03-20 | David B. Graham | Evacuatable rigid storage unit for storing compressible articles therein |
US6357915B2 (en) * | 1999-08-13 | 2002-03-19 | New West Products, Inc. | Storage bag with one-way air valve |
US6227706B1 (en) * | 2000-06-26 | 2001-05-08 | Thoai S. Tran | Two piece, compressible storage satchel for compressible articles |
US7022058B2 (en) * | 2001-02-21 | 2006-04-04 | Tilia International, Inc. | Method for preparing air channel-equipped film for use in vacuum package |
US20040000503A1 (en) * | 2002-06-28 | 2004-01-01 | Shah Ketan N. | Recloseable storage bag with porous evacuation portal |
US20040000502A1 (en) * | 2002-06-28 | 2004-01-01 | Shah Ketan N. | Recloseable storage bag with user-deformable air vent |
US20040000501A1 (en) * | 2002-06-28 | 2004-01-01 | Shah Ketan N. | Recloseable storage bag with secondary closure members |
US20040007494A1 (en) * | 2002-07-15 | 2004-01-15 | Popeil Ronald M. | Apparatus and method to more effectively vacuum package foods and other objects |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7857515B2 (en) | 2007-06-15 | 2010-12-28 | S.C. Johnson Home Storage, Inc. | Airtight closure mechanism for a reclosable pouch |
US7874731B2 (en) | 2007-06-15 | 2011-01-25 | S.C. Johnson Home Storage, Inc. | Valve for a recloseable container |
US7887238B2 (en) | 2007-06-15 | 2011-02-15 | S.C. Johnson Home Storage, Inc. | Flow channels for a pouch |
US7946766B2 (en) | 2007-06-15 | 2011-05-24 | S.C. Johnson & Son, Inc. | Offset closure mechanism for a reclosable pouch |
US7967509B2 (en) | 2007-06-15 | 2011-06-28 | S.C. Johnson & Son, Inc. | Pouch with a valve |
US8231273B2 (en) | 2007-06-15 | 2012-07-31 | S.C. Johnson & Son, Inc. | Flow channel profile and a complementary groove for a pouch |
US8397958B2 (en) | 2010-08-05 | 2013-03-19 | Ds Smith Plastics Limited | Closure valve assembly for a container |
US8820591B2 (en) | 2010-08-05 | 2014-09-02 | Ds Smith Plastics Limited | Closure valve assembly for a container |
US8973789B2 (en) | 2010-08-05 | 2015-03-10 | Ds Smith Plastics Limited | Closure valve assembly for a container |
Also Published As
Publication number | Publication date |
---|---|
CA2443888A1 (en) | 2002-09-26 |
MXPA03007545A (en) | 2004-10-15 |
CA2443888C (en) | 2007-08-14 |
JP2004519356A (en) | 2004-07-02 |
US20050147774A1 (en) | 2005-07-07 |
WO2002074522A1 (en) | 2002-09-26 |
AU2002234998B2 (en) | 2005-07-28 |
US20030155269A1 (en) | 2003-08-21 |
US20050143243A1 (en) | 2005-06-30 |
US7022058B2 (en) | 2006-04-04 |
EP1412167A1 (en) | 2004-04-28 |
CN100429070C (en) | 2008-10-29 |
EP1412167A4 (en) | 2007-08-08 |
CN1503722A (en) | 2004-06-09 |
TW530001B (en) | 2003-05-01 |
US20050147330A1 (en) | 2005-07-07 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7022058B2 (en) | Method for preparing air channel-equipped film for use in vacuum package | |
AU2002234998A1 (en) | Method for preparing air channel-equipped film for use in vacuum package | |
US7625459B2 (en) | Method for manufacturing liquid-trapping bag for use in vacuum packaging | |
AU751499B2 (en) | Multi-layered freezer storage bag | |
NZ203576A (en) | Reclosable plastics bag:non slip gripping edges | |
US20050037164A1 (en) | Liquid-trapping bag for use in vacuum packaging | |
US20050065007A1 (en) | Method for manufacturing a sealable bag having an integrated valve structure for use in vacuum packaging | |
US7087130B2 (en) | Method for manufacturing a sealable bag having an integrated zipper for use in vacuum packaging | |
KR20050116829A (en) | Forming evacuation channels during single and multi-layer extrusion process | |
US7138025B2 (en) | Method for manufacturing a sealable bag having an integrated tray for use in vacuum packaging | |
US6279300B1 (en) | Method of manufacturing air cell dunnage | |
US20050035020A1 (en) | Sealable bag having an integrated tray for use in vacuum packaging | |
KR100444402B1 (en) | Preparation Method of Film for Vacuum Package Having Air Channels | |
US20060283757A1 (en) | System and method for forming an integrated tray for use in vacuum packaging | |
WO2004078591A2 (en) | System and method for forming an integrated tray for use in vacuum packaging | |
WO2004078609A1 (en) | Liquid-trapping bag and method of making it |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SUNBEAM PRODUCTS, INC., FLORIDA Free format text: MERGER;ASSIGNOR:TILIA INTERNATIONAL, INC.;REEL/FRAME:020102/0840 Effective date: 20060630 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |