WO2000048481A1 - Flat-folded personal respiratory protection devices and processes for preparing same - Google Patents
Flat-folded personal respiratory protection devices and processes for preparing same Download PDFInfo
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- WO2000048481A1 WO2000048481A1 PCT/US1999/011575 US9911575W WO0048481A1 WO 2000048481 A1 WO2000048481 A1 WO 2000048481A1 US 9911575 W US9911575 W US 9911575W WO 0048481 A1 WO0048481 A1 WO 0048481A1
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- line
- demarcation
- fold
- preform
- layer
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Classifications
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- A—HUMAN NECESSITIES
- A41—WEARING APPAREL
- A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
- A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
- A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
- A41D13/11—Protective face masks, e.g. for surgical use, or for use in foul atmospheres
- A41D13/1107—Protective face masks, e.g. for surgical use, or for use in foul atmospheres characterised by their shape
- A41D13/113—Protective face masks, e.g. for surgical use, or for use in foul atmospheres characterised by their shape with a vertical fold or weld
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
- A62B18/00—Breathing masks or helmets, e.g. affording protection against chemical agents or for use at high altitudes or incorporating a pump or compressor for reducing the inhalation effort
- A62B18/02—Masks
- A62B18/025—Halfmasks
Definitions
- the present invention relates to personal respiratory protection devices that are capable of being folded flat during storage and form an air chamber over the mouth and nose of a wearer during use.
- Personal respiratory protection devices also known as filtration respirators or face masks
- face masks are used in a wide variety of applications to protect a wearer's respiratory system from particles suspended in the air or from unpleasant or noxious gases.
- Face masks are typically designed to be worn over the nose and the mouth to protect the wearer from undesirable material suspended in the air.
- these types of face masks come in two basic designs - a molded cup-shaped form or a flat-folded form.
- a conventional flat-folded form of face mask is typically constructed by incorporating a fabric that is rectangular in form and includes at least one pleat running generally parallel to the mouth of the wearer. Such constructions may have a stiffening element to hold the face mask away from contact with the wearer's face.
- Stiffening has also been provided by fusing a pleat across the width of the face mask in a laminated structure or by providing a seam across the width of the face mask.
- the flat-folded form has advantages in that it can be easily stored, such as in a wearer's pocket. It has been found that flat type face masks can conform quite closely to the wearer's face, that is, most of the inner surface of the mask may come into contact with the face of the wearer. Thus, flat face masks may be warm and uncomfortable during use, and this is particularly true when the face mask is worn for extended periods of time. In addition, the inner surface of the face mask may come into contact with the wearer's mouth such that the face mask often becomes wet and abraded. When this happens, the abraded material from the inner surface may irritate the wearer.
- Cup-shaped masks are typically molded masks that form an air-chamber over the face when in use thereby overcoming some of the comfort concerns related to flat folded masks.
- molded cup-shaped masks may not be folded flat for easy and convenient storage.
- U.S. Patent No. 3,971,369 to Aspelin et al. discloses a generally cup- shaped surgical mask that is not molded.
- the patent discloses that because the mask is not molded, the edges of the body portion of the mask are not rigid and therefore conform to the contours of the wearer's face.
- the mask is complicated to manufacture and the resulting design is pleated, having overlapping material on the front of the mask.
- the devices include a flat central portion, a flat first member joined to the central portion through either a fold-line, seam, weld, or bond and a flat second member joined to the central portion through either a fold-line, seam, weld, or bond. It is described that the device is capable of being folded flat for storage with the first and second members being in at least partial face to face contact with a common surface of the central portion and, during use, is capable of forming a cup-shaped air chamber over the nose and the mouth of the wearer.
- a personal respiratory protection device including a non-pleated main body.
- the main body includes a first portion; a second portion distinguished from the first portion by a first line of demarcation; a third portion distinguished from the second portion by a second line of demarcation; and a bisecting fold extending through the first portion, second portion and third portion; wherein the device is capable of being folded to a first substantially flat-folded configuration along the bisecting fold and is capable of being unfolded to a convex open configuration.
- the device includes filter media and a cover layer.
- the device includes a stiffener layer in at least the second portion.
- the device includes a weld-line between the first and second portion which bonds the filter media, cover layer and preferably the stiffener layer together.
- the device includes a second weld-line between the second portion and the third portion that bonds the layers together.
- a device in accordance with the present invention preferably has the first portion extending from the second portion at an angle of about 1 10 degrees to about 175 degrees when measured from the bisecting fold extending through the second portion to the bisecting fold extending through the first portion when the device is folded in the substantially flat-folded configuration.
- a device in accordance with the present invention preferably has the third portion extending from the second portion at an angle of about 100 degrees to about 165 degrees when measured from the bisecting fold extending through the second portion to the bisecting fold extending through the third portion when the device is folded in the substantially flat-folded configuration.
- a process for producing respiratory devices of different sizes from preformed blanks of the same size includes folding a preformed blank over a bisecting axis to create a preform having a bisecting fold-line and cutting the preform at a first desired angle at a first position relative to the bisecting fold-line, wherein the first desired angle depends on a desired size and fit of the device.
- the size and fit of the device may be further adjusted by cutting the preform at a second desired angle at a position relative to the bisecting fold-line.
- a device in accordance with the present invention may also include an optional constituent such as a face shield, a face seal, a neck cover, and a combination thereof.
- a flat-folded face mask in accordance with the present invention preferably contacts the wearer's face at the periphery of the face mask at an acute angle with minimal facial contact to form a convex- or cup-shaped region over the nose and mouth of the wearer, thereby increasing comfort to the wearer and potentially maximizing the engagement of the perimeter of the face mask to the face of the wearer.
- a process in accordance with the present invention is amenable to high speed production methods and may comprise additional steps as needed for attachment of headbands, ear loops, nosepieces, and other typical respiratory device components.
- Fig. 1 is a side view of a personal respiratory protection device of the invention in a flat-fold configuration.
- Fig. 2 is a front view of the personal respiratory protection device of Fig. 1 shown in an open ready-to-use configuration.
- Fig. 3 is a schematic illustration of an exemplary manufacturing process for producing a flat-folded personal respiratory protection device.
- Fig. 4a-4c is a schematic illustration of an assembly process utilizing a single preform resulting from an exemplary manufacturing process of Fig. 3.
- Fig. 5 is a cross-section taken along line 5-5 of a single preform of Fig. 4a.
- Fig. 6 is a schematic illustration of an anvil utilized to form weld-lines in a device in accordance with the present invention.
- Fig. 7 is a schematic illustration of an anvil utilized to form a preform in the process for making a device in accordance with the present invention.
- a personal respiratory protection device 10 is preferably capable of a flat-folded configuration, as shown in FIG. 1.
- the device is preferably folded in half along a line 18 that extends from a first portion 34 to a third portion 36 for storage in a package prior to use or in a wearer's pocket.
- FIG. 1 one half or a side view of a folded configuration of the personal respiratory protection device 10 is shown.
- the device includes a main body 12, a first portion 34, a second portion 38 and a third portion 36.
- a device in accordance with the present invention also includes attachment constituents, that can be an ear attachment constituent 26 or a headband (not shown).
- Convex open configuration shall mean a configuration of the device in use wherein the main body is substantially off the face of the wearer, yet is in sealing engagement with the face to provide an air chamber over the nose and mouth of the wearer.
- Line of demarcation shall mean a predetermined line in the main body 12 that distinguishes one portion 34, 36, 38 of the main body 12 from another.
- a line of demarcation forms an axis of rotation for one or more of the portions 34, 36, 38 to rotate at least partially around such line of demarcation.
- a line of demarcation may or may not extend the length or width of the main body 12. Examples of a line of demarcation include a fold-line, bond, weld-line or seam.
- “Pleat” means a fold wherein the material of the device is doubled back on itself at least once in an accordion-like fashion.
- Yield-line may or may not be a line of demarcation.
- the main body 12 preferably includes multiple layers that may function to filter unwanted particles suspended in the air, to protect the wearer from environmental irritation, and/or to warm the in-coming air in colder climates as the wearer inhales.
- a respiratory device in accordance with the present invention includes a first line of demarcation A and a second line of demarcation B that define the second portion 38 therebetween. These lines of demarcation provide two laterally extending axes of rotation for movement of the first portion 34 about the line of demarcation A and of the third portion 36 about the second line of demarcation B.
- the personal respiratory device includes a multi-layer construction.
- the lines of demarcation can prevent delamination of the multi-layers such that the inner layer does not collapse during use.
- the lines of demarcation are welds, because welds impart good structural integrity and prevent delamination.
- the lines of demarcation can be formed by a variety of techniques suitable to form an axis of rotation. Suitable techniques include welding (e.g., ultrasonic welding), application of pressure (with or without heat), application of adhesive bars, stitching, and the like. It is to be understood that the lines of demarcation can be substantially continuous, discontinuous, straight, curvilinear, and a combination thereof, so long as the lines of demarcation impart an axis of rotation for movement of the first portion 34 about the line of demarcation A and of the third portion 36 about the second line of demarcation B.
- At least one line of demarcation includes a weld-line and, more preferably, both lines of demarcation include weld-lines.
- the lines of demarcation do not include and are not part of a pleat.
- a bisecting fold 18 preferably includes a first fold 14, a second fold 14', and a third fold 14".
- the folds 14 and 14" are preferably formed by welds, as will be described below, that can be straight or curvilinear, but are preferably substantially straight as shown. However, the fold may be formed by other means in the art, such as stitching.
- the ear attachment constituent 26 is provided to hold the device in place on a wearer's face, typically by securing around the ears of the wearer.
- FIG. 2 The personal respiratory protection device 10 is shown in FIG. 2, where common parts are identified as in FIG. 1 , in its ready-to-wear convex open configuration having the general shape of a cup or pouch which provides the wearer with the "off-the-face” benefits of a "cup-shaped" respiratory device.
- This configuration allows the wearer a greater degree of jaw movement and wearer comfort because the device is substantially not in contact with the wearer's face in the mouth area.
- this configuration is preferably accomplished in the absence of pleat(s) running horizontally on the main body 12.
- a device in accordance with the present invention preferably includes a bisecting fold extending from the first portion to the third portion of the device, wherein the device is essentially divided into a first half and a second half. Aside from the bisecting fold, no other fold- lines are necessary to achieve a substantially flat-folded configuration of the device.
- the center portion 38 is less compliant than the first portion 34 and the second portion 36.
- a less compliant center portion included in a personal respiratory device in accordance with the present invention advantageously enhances the convex open configuration, thus contributing to the off-the-face benefits during wear.
- the shape and the size of a personal respiratory device 10 of the present invention may be varied by varying the shape and angle of the folds 14 and 14", which can be straight to curvilinear, preferably substantially straight, as desired to achieve good conformance to the wearer's face.
- the folds 14 and 14" are each preferably formed by a weld line that results in a first angle 40 and a second angle 42, from a first point of origin 44 and a second point of origin 46 along the second fold 14', respectively.
- the first angle 40, formed and measured from the second fold 14' to the first fold line 14, is about 110 degrees to about 175 degrees, more preferably about 140 degrees to about 155 degrees.
- the second angle 42, formed and measured from the second fold 14' to the third fold line 14" is about 100 degrees to about 165 degrees, more preferably about 135 degrees to about 150 degrees.
- the conformance of the respiratory device to the face can be easily altered to conform to varying face sizes.
- first and third fold lines 14 and 14" typically vary within a length range of about 40 mm to about 80 mm, wherein the first fold line and the third fold line are not necessarily the same length.
- a personal respiratory device in accordance with the present invention typically has a height (measured from the outer edge of the first portion to the outer edge of the second portion) in the convex open configuration of about 90 mm to about 160 mm, preferably from about 100 mm to about 150 mm, and more preferably from about 110 mm to about 140 mm.
- the height of the second portion 38 of the respiratory device 10 formed between lines of demarcation A, A' and B, B' is preferably about 30 mm to about 100 mm in height, more preferably about 35 mm to about 75 mm in height, most preferably about 45 mm to about 65 mm in height.
- a personal respiratory device in accordance with the present invention typically has a width (measured from the outer edge of the right edge seal to the outer edge of the left edge seal) in the convex open configuration of about 110 mm to about 190 mm, preferably from about 130 mm to about 170 mm, and more preferably from about 140 mm to about 160 mm.
- a personal respiratory device in accordance with the present invention preferably includes a multilayer construction having at least one cover layer and a filter layer.
- An optional stiffener layer may also be included.
- the filter layer includes media or material that is preferably included in at least the center portion of the device.
- the filter layer may be comprised of a number of woven and nonwoven materials, a single or a plurality of layers, with or without an inner or outer cover layer.
- the center portion is formed between the lines of demarcation laterally extending from the bisecting fold line.
- suitable filter material include microfiber webs, fibrillated film webs, woven or nonwoven webs (e.g., airlaid or carded staple fibers), solution-blown fiber webs, or combinations thereof.
- Fibers useful for forming such webs include, for example, polyolefins such as polypropylene, polyethylene, polybutylene, poly(4-methyl-l-pentene) and blends thereof, halogen substituted polyolefins such as those containing one or more chloroethylene units, or tetrafluoroethylene units, and which may also contain acrylonitrile units, polyesters, polycarbonates, polyurethanes, rosin-wool, glass, cellulose or combinations thereof.
- polyolefins such as polypropylene, polyethylene, polybutylene, poly(4-methyl-l-pentene) and blends thereof
- halogen substituted polyolefins such as those containing one or more chloroethylene units, or tetrafluoroethylene units, and which may also contain acrylonitrile units
- polyesters polycarbonates, polyurethanes, rosin-wool, glass, cellulose or combinations thereof.
- Fibers of the filtering layer are selected depending upon the type of particulate to be filtered. Proper selection of fibers can also affect the comfort of the respiratory device to the wearer, e.g., by providing softness or moisture control.
- Webs of melt blown microfibers useful in the present invention can be prepared as described, for example, in Wente, Van A., "Superfine Thermoplastic Fibers” in Industrial Engineering Chemistry, Vol. 48, 1342 et seq. (1956) and in Report No. 4364 of the Naval Research Laboratories, published May 25, 1954, entitled “Manufacture of Super Fine Organic Fibers" by Van A. Wente et al.
- the blown microfibers in the filter media useful on the present invention preferably have an effective fiber diameter of from 3 to 30 micrometers, more preferably from about 7 to 15 micrometers, as calculated according to the method set forth in Davies, C.N., "The Separation of Airborne Dust Particles," Institution of Mechanical Engineers, London, Proceedings IB, 1952. Staple fibers may also, optionally, be present in the filtering layer.
- the presence of crimped, bulking staple fibers provides for a more lofty, less dense web than a web consisting solely of blown microfibers.
- no more than 90 weight percent staple fibers, more preferably no more than 70 weight percent are present in the media.
- Such webs containing staple fiber are disclosed in U.S. Pat. No. 4, 118,531 (Hauser).
- Bicomponent staple fibers may also be used in the filtering layer or in one or more other layers of the filter media.
- the bicomponent staple fibers which generally have an outer layer which has a lower melting point than the core portion can be used to form a resilient shaping layer bonded together at fiber intersection points, e.g., by heating the layer so that the outer layer of the bicomponent fibers flows into contact with adjacent fibers that are either bicomponent or other staple fibers.
- the shaping layer can also be prepared with binder fibers of a heat-flowable polyester included together with staple fibers and upon heating of the shaping layer the binder fibers melt and flow to a fiber intersection point where they surround the fiber intersection point. Upon cooling, bonds develop at the intersection points of the fibers and hold the fiber mass in the desired shape.
- binder materials such as acrylic latex or powdered heat activatable adhesive resins can be applied to the webs to provide bonding of the fibers.
- Electrically charged fibers such those disclosed in U.S. Pat. No. 4,215,682 (Kubik et al.), U.S. Pat. No. 4,588,537 (Klasse et al.), or by other conventional methods of polarizing or charging electrets, e.g., by the process of U.S. Pat. No. 4,375,718 (Wadsworth et al.), or U.S. Pat. No. 4,592,815 (Nakao), or by a hydrocharging method described in U.S. Patent No. 5,496,507 (Angadjivand et al.) are particularly useful in the present invention. Electrically charged fibrillated-film fibers as taught in U.S. Pat. No. RE. 31 ,285 (van Turnhout), are also useful.
- Sorbent particulate material such as activated carbon or alumina
- sorbent fibers e.g., activated carbon fibers
- Such particle-loaded webs are described, for example, in U.S. Pat. No. 3,971,373 (Braun), U.S. Pat. No. 4,100,324 (Anderson) and U.S. Pat. No.
- a respiratory device for filtering airborne particulates of the present invention must include a filter layer in at least the one portion.
- the entire respiratory device in accordance with the present invention includes a filter layer.
- a personal respiratory device in accordance with the present invention may include at least one optional constituent as described herein.
- the first portion may include a material that provides a moisture barrier to prevent fogging of a wearer's glasses.
- personal respiratory devices of the present invention are typically held in place on a wearer's face by constituents well-known to those skilled in the art such as with straps or bands, preferably as ear loops and/or headbands.
- ear loops can be stapled to the respiratory device main body as shown in FIGS. 1 and 2, or they may be adhered to the main body of the respiratory device by means such as embossing, adhesive bonding, ultrasonic welding, sewing or other means commonly known to those skilled in the art.
- a personal respiratory device preferably has some degree of adjustability to effect tension against the wearer's face with or without the use of a headband.
- Straps or bands useful in the present invention may be constructed from thermoplastic elastomers, resilient polyurethane, polyisoprene, butylene-styrene copolymers.
- thermoplastic elastomers resilient polyurethane, polyisoprene, butylene-styrene copolymers.
- One such example is a styrene-butadiene-styrene block copolymer, commercially available under the trade designation KRATON D 1101, from Shell Chemical Co., Houston, TX.
- Straps or bands may also be constructed from elastic rubber or a covered stretch yarn, such as that commercially available under the trade designation LYCRA, from DuPont Co., Wilmington, DE.
- Also useful for straps or bands in the present invention are stretch activated, elastomeric composite materials.
- One such material is a non-tacky, multi-layer elastomeric laminate having at least one elastomeric core and at least one relatively nonelastomeric skin layer.
- the skin layer is stretched beyond its elastic limit and is relaxed with the core so as to form a microstructured skin layer.
- Microstructure means that the surface contains peak and valley irregularities or folds which are large enough to be perceived by the unaided human eye as causing increased opacity over the opacity of the composite before microstructuring, and which irregularities are small enough to be perceived as smooth or soft to human skin. Magnification of the irregularities is required to see the details of the microstructured texture. Examples of such elastomeric composites are disclosed in U.S. Pat. No. 5,501,679 (Krueger).
- non-elastic bands may also be used in the present invention and include, for example, non-woven materials formed by both wet-laid or dry-laid processes and consisting of rayon, polyester or like fibers, calendared spun-bonded webs of polypropylene, polyethylene or polyester and reinforced paper.
- the bands can be tied, clasped, or stretched such that the bands encircle the head of the wearer bringing the facemask in sealing engagement with the face of the wearer.
- the respiratory device may also include an optional exhalation valve, typically a diaphragm valve, which allows for the easy exhalation of air by the user.
- an exhalation valve having extraordinary low pressure drop during exhalation for the mask is described in U.S. Pat. No. 5,325,892 (Japuntich et al.).
- exhalation valves of other designs are well known to those skilled in the art.
- the exhalation valve is preferably secured to the center portion, preferably near the middle of the center portion, by sonic welds, adhesion bonding, mechanical clamping or the like.
- the respiratory device may optionally have attached, at the upper edge or outboard portions of the respiratory device, a face shield.
- Typical face shields are disclosed, for example, in U.S. Pat. No. 2,762,368 (Bloomfield) and U.S. Pat. No. 4,944,294 (Borek, Jr.). Also useful is the type of face shield disclosed in U.S.
- Typical neck covers are disclosed, for example in U.S. Pat. No. 4,825,878 (Kuntz et al.), U.S. Pat. No. 5,322,061 (Brunson), and U.S. Design Patent No. Des.
- any personal respiratory device may include a nosepiece including two-parts.
- two-part when referring to a nosepiece, refers to a configuration wherein a respiratory device or mask includes a first nosepiece part on a right side of the respiratory device and a second nosepiece on a left side of the respiratory, wherein the two parts are not joined across the nose when the device is donned by the wearer.
- a two-part nosepiece decreases the likelihood of the formation of a "peak" like configuration.
- a sharply pointed gap or “peak” may form over the nose because the single part nosepiece bends to accommodate the curvature of the bridge of the nose.
- the gap or peak is undesirable because moist breath air exhaled by the wearer tends to fog a wearer's glasses.
- Any respiratory device can include a two- part nosepiece to improve conformance over the wearer's nose, such as those that are commercially available under the trademarks 8210TM, 8210iTM, 8246TM, 8247TM, 1860TM, 8110STM, 8218TM, 8710TM, and 2610TM, all from Minnesota Mining and Manufacturing Company, St. Paul, MN.
- a two-part nosepiece permits conformance on the cheek area on either side of the nose while also permitting greater conformance over the bridge of the nose because that portion of the rigid nosepiece covering the bridge of the nose is absent.
- improved conformance over the nose is observed when a respiratory device includes a two-part nosepiece.
- the manufacturing of a respiratory device including a two-part nosepiece can be simplified.
- a two-part nosepiece can be added to the respiratory device at any point during the process, including prior to folding the device.
- a single part nosepiece is typically added once the device is folded so that the single part nosepiece resides on either side of the fold and on the fold itself.
- the two-part nosepiece can be added to a substantially flat preform (described below) at any point in the manufacturing process.
- the two-part nosepiece can be attached to a surface of a cover layer so that the two-part nosepiece is encased within the device (so that the nosepiece is invisible to the wearer) or on an exterior surface of the device.
- a nosepiece useful in the respiratory device of the present invention may include a single part nosepiece or a two-part nosepiece.
- the nosepiece can be made of a formable material for example, a pliable dead-soft band of metal such as aluminum or plastic coated wire and can be shaped to conform the device comfortably to a wearer's face. Additionally, a non-linear nosepiece configured to extend over the bridge of the wearer's nose having inflections disposed along the clip section to afford wings that assist in providing a snug fit of the mask in the nose and cheek area.
- the nosepiece may be secured to the respiratory device by an adhesive, for example, a pressure sensitive adhesive, a liquid hot-melt adhesive, or ultrasonic welding.
- the nosepiece may be encased in the body of the respiratory device or it may be held between the device body and a fabric or foam that is mechanically or adhesively attached thereto.
- the nosepiece is positioned on the outside part of the nose portion. Because the nose portion is more compliant than the center portion, a respiratory device in accordance with the present invention preferably does not require the presence of a foam piece. If included, a foam piece is typically disposed between a respiratory device in alignment with the nosepiece for added comfort to the wearer.
- Personal respiratory devices of the present invention can be sterilized by any standard method, such as gamma radiation, exposure to ethylene oxide, or autoclaving.
- a flat-folded respiratory device such as that illustrated in FIG. 1 , is preferably formed from a single piece, although multiple pieces can be attached to one another using the various techniques described herein, such as a batch process (e.g., by plunge welding) or a continuous process (e.g., rotary welding). In either process, a flat-folded respiratory device is preferably produced by forming a substantially flat sheet of a multilayer construction (also referred to herein as a "preform") by bonding and cutting the outer forming edges. Other techniques may be employed for forming the edges utilizing other techniques, such as ultrasonic welding, stitching, and the application of pressure to form the edges (with or without the addition of heat).
- a substantially flat preform can have any shape.
- the substantially flat preform 136 has a diamond shape, although other shapes (e.g., pentagonal, hexagonal, semicircular, square, butterfly, etc.) are equally suitable.
- a process in accordance with the present invention also includes forming at least one line of demarcation within the preform; folding the preform along a substantially bisecting axis; and forming a first angle and a second angle.
- FIG. 3 is a schematic illustration of one production process 120 for manufacturing a flat-folded respiratory devices such as shown in FIG. 1.
- An inner cover web 124 and a filter layer 126 are preferably supplied in roll form for a substantially continuous process.
- the nosepiece 24 (for example, as a two-part nosepiece described above) may be positioned on an outer or an inner surface of either the inner cover web 124 or outer cover web 132.
- a stiffening material 128 is preferably positioned proximate center on the filter layer 126.
- the filter layer 126 and the stiffening material 128 are covered by an outer cover web 132 to form a web assembly 134.
- the web assembly 134 may be held together by surface forces, electrostatic forces, thermal bonding, an adhesive or any other suitable well-known means.
- the web assembly 134 can be welded and trimmed to form a preform 136 at welding station 136a.
- the preform 136 is substantially flat such that a face mask in accordance with the present invention can be formed a relatively high rates of speed and at a relatively low cost because conventional components, such as molded support shells, are not required.
- the preform 136 then passes through a demarcation station 138.
- the demarcation station 138 at least one line of demarcation is formed in the preform to form a demarked preform 136'.
- a line of demarcation can be formed by a variety of techniques including ultrasonic welding, application of pressure (with or without the presence of heat), stitching, application of adhesive bars, and the like.
- the demarked preform 136' includes lines of demarcation A, A', B, and B'.
- the lines of demarcation function to prevent delamination of the layers in the preform, to add stiffness to the second portion of the face mask during wear, and to provide greater flexibility of the first portion and the third portion relative to the second portion.
- FIG. 5, taken across line 5-5 in FIG. 4a, illustrates a cross-section of a welded preform 136'.
- the second portion 38 preferably includes an outer layer 132, a stiffening material layer 128, a filter layer 126, and an inner layer 124.
- the first portion 34 and the third portion 36 preferably include the outer layer 132, the filter layer 126, and the inner layer 124.
- the stiffening material 128 is preferably absent from each of the first portion 34 and the third portion 26. As shown in FIG. 5, a slight extension of the stiffening material 128 may be necessary in the first portion, the third portion, or both so that all layers can be attached via the lines of demarcation. Alternatively, the stiffening material 128 may extend into the lines of demarcation but no further or it may extend to just inside the lines of demarcation so that the stiffening material is located within a pocket formed by the lines of demarcation.
- the demarked preform 136' is preferably folded along bisecting fold 18 parallel to a substantially vertical axis along the midsection of the length of the welded preform 136'. As shown in FIG. 4c, a folded preform 136" is then welded and cut along lines C and D, each at predetermined angles relative to the second fold line 14', to form fold lines 14 and 14", respectively.
- the demarked preform 136' is preferably formed from a single piece. However, multiple pieces can be joined along fold lines 14, 14', and 14" such that any or all of these fold lines include a weld line. Preferably, fold line 14' does not include a weld line.
- Each of the predetermined angles of lines C and D can be varied independently to adjust the size and shape of the resulting face mask by adjusting the first portion and/or the third portion.
- the folded preform can be welded and cut along line C so that the fold line 14 is provided at an angle of about 147 degrees relative to the second fold line 14' to form the nose portion.
- the folded preform can be welded and cut along line D so that the third fold line 14" is provided at an angle of about 142 degrees relative to the second fold line 14' to form the third portion.
- these angles can be easily varied to accommodate a variety of face sizes and shapes.
- a process in accordance with the present invention is preferably capable of high speed production methods and may comprise additional steps as needed for attachment of headbands, nosepieces, and other typical respiratory device components.
- *Hold time refers to the time period during which the preform was held under pressure in the absence of ultrasonic power.
- Inner cover web The materials were layered together and then welded together using an anvil 60 as shown in FIG. 6, where weld protrusions 62, 62', 64, and 64' pressed into the layered material to form the lines of demarcation A, A', B, and B', respectively, as illustrated in FIG. 4a.
- the diamond-shaped preform was formed utilizing an anvil 70 illustrated in FIG. 7.
- the anvil 70 was first pressed into the layered material including the lines of demarcation, resulting in the left half of the welded preform.
- the anvil 70 was rotated 180 degrees and pressed into the layered material such that the first compression described above and this second compression completed the formation of the welded preform as illustrated in FIG. 4a.
- a folded preform was formed, and welded along lines C and D, as shown in FIG. 4c.
- Each of the Examples below contained an filter material that was a layer of electrically charged melt blown polypropylene microfibers with a fiber diameter of about 7 to about 8 microns and a basis weight of about 50 grams per square meter.
- each of the Examples below included a nosepiece, whether a single part or a two-part nosepiece.
- Each of the nosepieces was formed from a dead soft aluminum band having a width of about 5 mm and a thickness of about 0.8 mm.
- the length was about 87 mm.
- the length of each part was about 38 mm.
- a personal respiratory device including ear loops.
- a personal respiratory device including adjustable ear loops.
- Ear loops Formed from polyisoprene having the dimensions of 4.8 mm wide, 22 cm long, 0.5 mm thick (2 each)
- a personal respiratory device including a netting as a stiffener.
- a personal respiratory device without a stiffening layer and including a braided headband.
- a personal respiratory device was designed including a two-part nosepiece and braided ear loops.
- Personal respiratory devices of the Examples above exhibited good fit and off-the-face characteristics. It was surprising that these well conforming personal respiratory devices could be easily fabricated from a single substantially flat multilayer piece.
- Personal respiratory devices of the present invention include, for example, respirators, surgical masks, clean room masks, face shields, dust masks, breath warming masks, and a variety of other face coverings.
- the respiratory devices of the present invention provide improved sealing engagement with the wearer's face as compared to some other conventional types of flat-folded face masks.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000599285A JP4295438B2 (en) | 1999-02-17 | 1999-05-26 | Flat foldable personal respiratory protection device and preparation method thereof |
EP99925845A EP1152668A1 (en) | 1999-02-17 | 1999-05-26 | Flat-folded personal respiratory protection devices and processes for preparing same |
PL99349882A PL188442B1 (en) | 1999-02-17 | 1999-05-26 | Flat-folded personal respiratory protection devices and processes for preparing same |
AU42050/99A AU762416B2 (en) | 1999-02-17 | 1999-05-26 | Flat-folded personal respiratory protection devices and processes for preparing same |
CA002368844A CA2368844A1 (en) | 1999-02-17 | 1999-05-26 | Flat-folded personal respiratory protection devices and processes for preparing same |
BR9917135-0A BR9917135A (en) | 1999-02-17 | 1999-05-26 | Personal respiratory protection device, and process to produce respiratory devices |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US09/250,825 | 1999-02-17 | ||
US09/250,825 US6394090B1 (en) | 1999-02-17 | 1999-02-17 | Flat-folded personal respiratory protection devices and processes for preparing same |
Publications (1)
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WO2000048481A1 true WO2000048481A1 (en) | 2000-08-24 |
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PCT/US1999/011575 WO2000048481A1 (en) | 1999-02-17 | 1999-05-26 | Flat-folded personal respiratory protection devices and processes for preparing same |
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US (1) | US6394090B1 (en) |
EP (1) | EP1152668A1 (en) |
JP (1) | JP4295438B2 (en) |
KR (1) | KR100561579B1 (en) |
CN (2) | CN1161046C (en) |
AU (1) | AU762416B2 (en) |
BR (1) | BR9917135A (en) |
CA (1) | CA2368844A1 (en) |
CZ (1) | CZ20012983A3 (en) |
HU (1) | HUP0200084A2 (en) |
PL (1) | PL188442B1 (en) |
RU (1) | RU2218199C2 (en) |
TR (1) | TR200102391T2 (en) |
TW (1) | TW555579B (en) |
WO (1) | WO2000048481A1 (en) |
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- 1999-05-26 CN CNB998016012A patent/CN1161046C/en not_active Expired - Fee Related
- 1999-05-26 CA CA002368844A patent/CA2368844A1/en not_active Abandoned
- 1999-05-26 AU AU42050/99A patent/AU762416B2/en not_active Expired
- 1999-05-26 RU RU2001123221/12A patent/RU2218199C2/en not_active IP Right Cessation
- 1999-05-26 JP JP2000599285A patent/JP4295438B2/en not_active Expired - Lifetime
- 1999-05-26 HU HU0200084A patent/HUP0200084A2/en unknown
- 1999-05-26 EP EP99925845A patent/EP1152668A1/en not_active Withdrawn
- 1999-05-26 KR KR1020017010443A patent/KR100561579B1/en not_active IP Right Cessation
- 1999-05-26 TR TR2001/02391T patent/TR200102391T2/en unknown
- 1999-05-26 CN CNB2004100033232A patent/CN1262321C/en not_active Expired - Lifetime
- 1999-05-26 BR BR9917135-0A patent/BR9917135A/en not_active IP Right Cessation
- 1999-05-26 WO PCT/US1999/011575 patent/WO2000048481A1/en active IP Right Grant
- 1999-05-26 CZ CZ20012983A patent/CZ20012983A3/en unknown
- 1999-05-26 PL PL99349882A patent/PL188442B1/en unknown
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2000
- 2000-02-19 TW TW089102704A patent/TW555579B/en active
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US2565124A (en) * | 1948-09-22 | 1951-08-21 | Henry J Durborow | Medical face mask |
US2634724A (en) * | 1949-10-22 | 1953-04-14 | Henry L Burns | Disposable breathing mask |
US3971369A (en) * | 1975-06-23 | 1976-07-27 | Johnson & Johnson | Folded cup-like surgical face mask and method of forming the same |
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FR2471792A1 (en) * | 1979-12-18 | 1981-06-26 | Airfil | Face mask for dust and filter protection - has filter element formed by successive folding of sheet with nose clip and head band |
US5701892A (en) * | 1995-12-01 | 1997-12-30 | Bledstein; Adrien Janis | Multipurpose face mask that maintains an airspace between the mask and the wearer's face |
Cited By (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7677248B2 (en) | 2002-06-05 | 2010-03-16 | Louis M. Gerson Co., Inc. | Stiffened filter mask |
EP1402914A1 (en) * | 2002-09-24 | 2004-03-31 | Imeco einwegprodukte gmbh + co. | Breathing protection for mouth to mouth/nose -respiration and method and device for the fabrication thereof |
US11904191B2 (en) | 2007-05-03 | 2024-02-20 | 3M Innovative Properties Company | Anti-fog respirator |
US11877604B2 (en) | 2007-05-03 | 2024-01-23 | 3M Innovative Properties Company | Maintenance-free respirator that has concave portions on opposing sides of mask top section |
EP2407209A1 (en) * | 2009-03-12 | 2012-01-18 | Shigematsu Works Co., Ltd. | Mask |
EP2407209A4 (en) * | 2009-03-12 | 2013-04-10 | Shigematsu Works | Mask |
EP2441494A1 (en) * | 2009-06-12 | 2012-04-18 | Shigematsu Works Co., Ltd. | Mask with nasal cushion |
EP2441494A4 (en) * | 2009-06-12 | 2014-12-03 | Shigematsu Works | Mask with nasal cushion |
RU2446845C1 (en) * | 2009-10-23 | 2012-04-10 | Зм Инновейтив Пропертиз Компани | Filtration respiratory face mask with base comprising parallel weld line structure |
US8528560B2 (en) | 2009-10-23 | 2013-09-10 | 3M Innovative Properties Company | Filtering face-piece respirator having parallel line weld pattern in mask body |
US20170258150A1 (en) * | 2014-12-04 | 2017-09-14 | 3M Innovative Properties Company | Flat-Fold Respirator |
US20210112893A1 (en) * | 2014-12-04 | 2021-04-22 | 3M Innovative Properties Company | Flat-Fold Respirator |
CN106998834A (en) * | 2014-12-04 | 2017-08-01 | 3M创新有限公司 | Flat-fold respirator |
US20170340031A1 (en) * | 2014-12-04 | 2017-11-30 | 3M Innovative Properties Company | Respirator Valve |
CN106998833B (en) * | 2014-12-04 | 2020-01-03 | 3M创新有限公司 | Nose support of respirator |
CN106998834B (en) * | 2014-12-04 | 2020-01-14 | 3M创新有限公司 | Flat-folding respirator |
US10863784B2 (en) | 2014-12-04 | 2020-12-15 | 3M Innovative Properties Company | Flat-fold respirator |
KR20170090489A (en) * | 2014-12-04 | 2017-08-07 | 쓰리엠 이노베이티브 프로퍼티즈 캄파니 | Flat-fold respirator |
WO2016090072A1 (en) * | 2014-12-04 | 2016-06-09 | 3M Innovative Properties Company | Flat-fold respirator |
CN106998833A (en) * | 2014-12-04 | 2017-08-01 | 3M创新有限公司 | Respirator nose support |
KR102603376B1 (en) * | 2014-12-04 | 2023-11-20 | 쓰리엠 이노베이티브 프로퍼티즈 캄파니 | Flat-fold respirator |
US11445771B2 (en) * | 2014-12-04 | 2022-09-20 | 3M Innovative Properties Company | Respirator valve |
US11813581B2 (en) | 2017-07-14 | 2023-11-14 | 3M Innovative Properties Company | Method and adapter for conveying plural liquid streams |
DE202020102444U1 (en) | 2020-04-30 | 2021-08-02 | Autefa Solutions Austria Gmbh | Protective mask |
EP3929340A1 (en) | 2020-06-26 | 2021-12-29 | Lenzing Aktiengesellschaft | Electrostatically charged filter material, its manufacture and use |
DE202020106886U1 (en) | 2020-11-30 | 2022-03-03 | Zender Germany Gmbh | respirator |
Also Published As
Publication number | Publication date |
---|---|
PL188442B1 (en) | 2005-01-31 |
KR20020016615A (en) | 2002-03-04 |
JP4295438B2 (en) | 2009-07-15 |
BR9917135A (en) | 2002-01-29 |
US6394090B1 (en) | 2002-05-28 |
KR100561579B1 (en) | 2006-03-20 |
CZ20012983A3 (en) | 2002-11-13 |
PL349882A1 (en) | 2002-09-23 |
TW555579B (en) | 2003-10-01 |
JP2002537009A (en) | 2002-11-05 |
CN1292652A (en) | 2001-04-25 |
CN1262321C (en) | 2006-07-05 |
CA2368844A1 (en) | 2000-08-24 |
AU762416B2 (en) | 2003-06-26 |
RU2218199C2 (en) | 2003-12-10 |
TR200102391T2 (en) | 2002-03-21 |
CN1511601A (en) | 2004-07-14 |
EP1152668A1 (en) | 2001-11-14 |
HUP0200084A2 (en) | 2002-05-29 |
CN1161046C (en) | 2004-08-11 |
AU4205099A (en) | 2000-09-04 |
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