WO1988003473A1 - Process for forming hollow objects, by injection and curing, in elastomer with closely adhering dies - Google Patents

Process for forming hollow objects, by injection and curing, in elastomer with closely adhering dies Download PDF

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Publication number
WO1988003473A1
WO1988003473A1 PCT/IT1986/000094 IT8600094W WO8803473A1 WO 1988003473 A1 WO1988003473 A1 WO 1988003473A1 IT 8600094 W IT8600094 W IT 8600094W WO 8803473 A1 WO8803473 A1 WO 8803473A1
Authority
WO
WIPO (PCT)
Prior art keywords
die
core
dies
halves
elastomer
Prior art date
Application number
PCT/IT1986/000094
Other languages
French (fr)
Inventor
Alberto Ferri
Fedelia Artuso
Original Assignee
Alberto Ferri
Fedelia Artuso
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Alberto Ferri, Fedelia Artuso filed Critical Alberto Ferri
Priority to KR1019880700753A priority Critical patent/KR890700078A/en
Publication of WO1988003473A1 publication Critical patent/WO1988003473A1/en
Priority to DK356388A priority patent/DK356388A/en
Priority to NO882904A priority patent/NO882904L/en

Links

Classifications

    • 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
    • B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D22/00—Producing hollow articles
    • B29D22/003—Containers for packaging, storing or transporting, e.g. bottles, jars, cans, barrels, tanks
    • B29D22/006—Hot water bottles
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
    • B29C45/006—Joining parts moulded in separate cavities
    • 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
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/0053—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor combined with a final operation, e.g. shaping
    • B29C45/006—Joining parts moulded in separate cavities
    • B29C2045/0072—Joining parts moulded in separate cavities the parts to be joined being moulded in a stack mould

Definitions

  • two halves of the body are molded in the two chambers created between the two halves of the die and the intermediate core.
  • the core is removed from the die, the edges of the two halves are placed together, fluid under pressure is injected inside the die after which the elastomer is cured.
  • Subject of the invention is a process for molding elastomer in dies to form hollow bodies so shaped that, by cutting them apart on a geometrical plane, the edges of the two halves obtained have outlines substantially suited to complete matching.
  • the complete die is composed of three main parts: an upper half, a lower half and an intermediate core creating one or more pairs of chambers respectively for the two substantially complementary halves of each object.
  • the material Is injected simultaneously into the two chambers for making each object, through a side channel for each chamber, one of said channels being situated between one face of the core and the upper half of the die, and the other between the other face of the core and the lower half of the die.
  • Said channels lying parallel, are connected by means of a feed hole passing transversally through the core.
  • Said hole Is connected,by means of a longitudinal branching duct inside the core, with a second transversal hole for influx of the material, opening onto one face of the core, opposite to one of the die halves at a point corresponding to a mouth in said die half, in such a way as to be aligned with the input nozzle for the material.
  • Each half of the molded object is therefore connected to the material input channel on a lateral edge.
  • the core is extracted leaving the two halves of the hollow object in the two half dies; the die is then closed once more to align the two edges of said two halves. Finally, the two edges are welded together during the curing process.
  • said appendix reacting to the pulling force on the material left inside the core feed hole, causes detachment of said material from the two halves of each hollow object allowing said objects to remain closely fitting to the two half dies to ensure effective curing.
  • the die having been closed following removal of the core, fluid is blown into said die under pressure to assist and maintain close adherence of the two halves of the hollow object to their respective halves of the die while the curing process continues.
  • the die has two pairs of chambers so that two hollow objects cen be produced simultaneously.
  • the core feed hole lies between the two pairs of chambers.
  • a channel connects each of the two mouths of said feed hole to the chambers which form the two halves of the hollow object in each half of the die.
  • the effect of the foregoing is to ensure a more balanced distribution of the material, a higher output from the die, and a superior end product.
  • a grip slide to support the nozzles blowing the fluid in under pressure while curing is proceeding, and to permit said nozzles to translate.
  • Any piece to be inserted is preferably associated to the nozzles used for blowing the fluid in under pressure.
  • the core is supported by a grip slide moving back and forth perpendicularly to the direction in which the die opens and closes.
  • Fig. 1 Viewof the open die, cut through at its central longitudinal axis.
  • Fig. 2 Detail of the closed die, cut through at its central longitudinal axis.
  • Fig. 3 Partial cross section of the die at the position of the core feed hole.
  • FIG. 4 The cross section of Fig. 3 when Injection molding has been completed.
  • Fig. 5 Front view of the upper half of the die.
  • Fig. 6 The open die cut through at the level of an impression.
  • Fig. 8 The die in Fig. 6, closed, during the curing process.
  • the die (10) comprises the upper die half (11), the lower die half (12) and the intermediate core (13).
  • the upper die half (11) shows the female impressions (14) and (16) substantially equal to the impressions (15) and (17) in the lower die half.
  • the core (13) shows the male shapes (18), (19) and (20), (21), for creating, when the die is closed, the chambers (29), (31) and (30), (32) respectively for the two objects formed by the die, especially two hot water bottles.
  • the material is injected into the mold through the nozzle (39) which, at each molding operation, approaches the die (11) penetrating into the housing (40) until it comes in contact with the projecting mouth (41) which, when the die closes, penetrates inside the hole (42) of the die (11). From the mouth (41 ) the fluid material flows, through the vertical hole (22), into the branch duct(23) communicating centrally with the vertical transversal feed hole (24) passing through the core (13).
  • the material flows through the upper mouth (25) and lower mouth (26) into the channels (27) and (28) respectively situated in the body of the half die (11) at the top, and of the other half die (12) at the bottom.
  • Said channels (27) arid (28) connect with the chambers (29) and (30) created by matching the upper die with the core (13) and, respectively, with the chambers (31) and (32) created by matching up the lower die (12) with the core
  • the die On completion of the forming process the die is opened to allow the core (13) to be removed.
  • Figure 6 shows a longitudinal cross section at the level of the impressions (14) and (15) and of the corresponding male forms (18), (20).
  • Figure 7 shows the stage corresponding to closure of the die and the beginning of the injection process.
  • the two parts of the die are put back together again as seen in Fig. 8 and, after injecting compressed air inside the die, the curing stage begins which welds the outer edges (39) and (40) of the two halves like (35) and (36) of the object that, in the example described, together form a hot water bottle (41).

Abstract

Process for forming hollow objects (41) in elastomer, especially hot water bottles, by injecting the material into the two chambers (29-31), (30-32) formed between two half dies (11), (12) and an intermediate core (13) each chamber (29-31), (30-32) being connected by a lateral channel (27), (28) respectively to the one mouth (25) and the other (26) of a transversal feed hole (24) passing through the core (13) to which the material flows in by means of an internal branch duct (23), there being in each of the half dies (11) and (12), in the zone corresponding to the one mouth (25) and the other mouth (26) of the feed hole (24), a recess (33), (34) whose outer hole is smaller than its internal volume, the purpose of which is to prevent, by reaction of the material that penetrates within it, the two halves (35-36), (37-38) of the hollow object (41) from becoming detached from the two half dies (11), (12), at the moment when the core (13) is removed to pass on to the stage of curing.

Description

PROCESS FOR FORMING HOLLOW OBJECTS, BY INJECTION AND CURING, IN ELASTOMER WITH CLOSELY ADHERING DIES
Various processes are adopted for manufacturing hollow objects of synthetic or natural rubber, such as hot water bottles, for example, utilizing a die composed of three parts, one part which may be called the upper die, another opposite it which may be called the lower die and a central part known as the core.
When the material is placed in the die, in the form of sheets of rubber, one sheet for each of the two halves of the die, by compressing the material in special presses and applying heat to it, a finished product is obtained by the curing process.
To extract the core from the object so produced various measures must be taken; in the case of hot water bottles, for example, certain dimensions must be given to the mouth so as to allow extraction of the core, but the material is often torn because of the excessive strain put upon it.
Further difficulties arise over application of inserted pieces, such as the threaded ring for the stopper.
According to another process two halves of the body are molded in the two chambers created between the two halves of the die and the intermediate core.
When molding is finished, the core is removed from the die, the edges of the two halves are placed together, fluid under pressure is injected inside the die after which the elastomer is cured.
During removal of the core, some areas of the two halves of the hollow object tend to be pulled too hard by exit of said core, and become detached from the die especially when the material is injected through the core. In the process of extracting the core, due to connection between the molded objects and the material remaining in the feed hole, pulling forces are in fact set up tending to detach the half of the object from its half die. The invention here described avoids the above drawbacks providing at the same time considerable advantages as wiil be explained below.
Subject of the invention is a process for molding elastomer in dies to form hollow bodies so shaped that, by cutting them apart on a geometrical plane, the edges of the two halves obtained have outlines substantially suited to complete matching.
This is therefore a process particularly suited to production of hot water bottles.
The complete die is composed of three main parts: an upper half, a lower half and an intermediate core creating one or more pairs of chambers respectively for the two substantially complementary halves of each object. The material Is injected simultaneously into the two chambers for making each object, through a side channel for each chamber, one of said channels being situated between one face of the core and the upper half of the die, and the other between the other face of the core and the lower half of the die.
Said channels, lying parallel, are connected by means of a feed hole passing transversally through the core.
Said hole Is connected,by means of a longitudinal branching duct inside the core, with a second transversal hole for influx of the material, opening onto one face of the core, opposite to one of the die halves at a point corresponding to a mouth in said die half, in such a way as to be aligned with the input nozzle for the material.
Each half of the molded object is therefore connected to the material input channel on a lateral edge.
After molding the core is extracted leaving the two halves of the hollow object in the two half dies; the die is then closed once more to align the two edges of said two halves. Finally, the two edges are welded together during the curing process.
In the area corresponding to each mouth of the core feed hole, there are recesses, one in each half die, the outer apertures of which are smaller than their internal volume, so that, within said recesses, an appendix of material is formed and is joined to the rest of said material, which on completion of molding, remains in the core feed hole.
Thus, when the die is opened and the core removed, said appendix, reacting to the pulling force on the material left inside the core feed hole, causes detachment of said material from the two halves of each hollow object allowing said objects to remain closely fitting to the two half dies to ensure effective curing. The die having been closed following removal of the core, fluid is blown into said die under pressure to assist and maintain close adherence of the two halves of the hollow object to their respective halves of the die while the curing process continues. Preferably the die has two pairs of chambers so that two hollow objects cen be produced simultaneously.
The core feed hole lies between the two pairs of chambers.
A channel connects each of the two mouths of said feed hole to the chambers which form the two halves of the hollow object in each half of the die.
The effect of the foregoing is to ensure a more balanced distribution of the material, a higher output from the die, and a superior end product.
In one half die there is a grip slide to support the nozzles blowing the fluid in under pressure while curing is proceeding, and to permit said nozzles to translate.
Any piece to be inserted, such as the threaded ring for hot water bottles, is preferably associated to the nozzles used for blowing the fluid in under pressure. The core is supported by a grip slide moving back and forth perpendicularly to the direction in which the die opens and closes.
Characteristics and purposes of the invention will be made even clearer by the following example of its execution Illustrated by drawings.
Fig. 1 Viewof the open die, cut through at its central longitudinal axis.
Fig. 2 Detail of the closed die, cut through at its central longitudinal axis.
Fig. 3 Partial cross section of the die at the position of the core feed hole.
Fig. 4 The cross section of Fig. 3 when Injection molding has been completed. Fig. 5 Front view of the upper half of the die.
Fig. 6 The open die cut through at the level of an impression.
Fig. 7 Ditto as above, closed during molding.
Fig. 8 The die in Fig. 6, closed, during the curing process.
The die (10) comprises the upper die half (11), the lower die half (12) and the intermediate core (13).
Said die makes possible the simultaneous production of two hot water bottles placed side by side. The upper die half (11) shows the female impressions (14) and (16) substantially equal to the impressions (15) and (17) in the lower die half.
The core (13) shows the male shapes (18), (19) and (20), (21), for creating, when the die is closed, the chambers (29), (31) and (30), (32) respectively for the two objects formed by the die, especially two hot water bottles.
The material is injected into the mold through the nozzle (39) which, at each molding operation, approaches the die (11) penetrating into the housing (40) until it comes in contact with the projecting mouth (41) which, when the die closes, penetrates inside the hole (42) of the die (11). From the mouth (41 ) the fluid material flows, through the vertical hole (22), into the branch duct(23) communicating centrally with the vertical transversal feed hole (24) passing through the core (13).
The material flows through the upper mouth (25) and lower mouth (26) into the channels (27) and (28) respectively situated in the body of the half die (11) at the top, and of the other half die (12) at the bottom.
Said channels (27) arid (28) connect with the chambers (29) and (30) created by matching the upper die with the core (13) and, respectively, with the chambers (31) and (32) created by matching up the lower die (12) with the core
(13).
The body of the upper die (11), in line with the mouth(25) of the transversal feed hole (24) in the core (13), contains a recess (33) shaped substantially like a truncated cone the base of which is internal, and similarly, the body of the lower die (12), in line with the mouth (26) of the above hole (24), contains a recess (34) also shaped like a truncated cone the base of which lies internally. After closing the die, elastomer is injected into it.
On completion of the forming process the die is opened to allow the core (13) to be removed.
During the opening stage the material that had previously penetrated inside the recesses (33), (34) creates a force tending to retain the material present in the channels (27) and (28), breaking connection with the material inside the feed hole (24) opposing those forces that are tending to detach the hollow bodies (35), (36), (37), (38) from the sides of each half die. Figure 6 shows a longitudinal cross section at the level of the impressions (14) and (15) and of the corresponding male forms (18), (20).
Figure 7 shows the stage corresponding to closure of the die and the beginning of the injection process.
When the core is removed, the two parts of the die are put back together again as seen in Fig. 8 and, after injecting compressed air inside the die, the curing stage begins which welds the outer edges (39) and (40) of the two halves like (35) and (36) of the object that, in the example described, together form a hot water bottle (41).
Curing having been completed all that is required is to open the die and lift out the perfectly shaped hot water bottle. The advantages of the invention are clear.
Avoidance of the drawbacks which injection of the material, made through the core caused because of the tendency for said core to pull the molded bodies away from the dies at the moment of its extraction, leading to spoiled products and their consequent rejection.
Testing of the hollow objects, especially of hot water botties,becomes in practice a part of the procedure adopted since the air blown into the die during curing immediately shows up any incomplete or damaged moldings. Using a single machine and a quick and effective injection system, hollow objects in elastomer, especially hot water bottles, are made of excellent quality, speedily and at a low cost. As the applications of the invention have been described as examples only not limited to these, it is understood that every equivalent application of the inventive concepts explained and every product made and/or in operation according to the characteristics of the invention will be covered by its field of protection.

Claims

Claims
1. Process for forming hollow objects in elastomer, by means of molds, said objects being divisible, in relation to a geometrical plane of separation, into two halves the edges of which both delimit a substantially equivalent shape and therefore can be completely fitted cne onto the other, especially suitable for hot water bottles, characterized in that the die (10) is composed of three main parts, an upper half die (11), a lower half die (12; and a core (13) betv/een said half dies giving rise to one or more pairs of chambers (29-31) for the two halves (35-36) respectively, substantially complementary for each object (41), the material being injected simultaneously into the two chambers (29-31) of each pair through lateral channels (27-28) one of which (27) is situated between one face of the core (13) and the upper half die, and the other (28) between the second face of the core (13) and the lower half die (12), said channels (27), (28) being parallel and connected by a transversal feed hole (24) passing through the core (13) in turn connected by an internal longitudinal branch duct (23) to a second transversal hole (22), opening onto one of the faces of the core (13) counterposed to one of the half dies (11) at the point of a mouth (42) in this latter, suitable for accepting a nozzle (39) through which the material enters, each of the two halves (35-36) of each molded object (41) being therefore connected to the channels (27-28) carrying the material on a lateral edge, the intermediate core (13) being extracted on completion of the molding process leaving the two halves (35-36) of the hollow object (41) lodged in the two half dies (11-12), the die being then closed again to allow the edges (39-40) of said two halves (35-36) to fit togethe after which said edges are joined together by curing.
2. Process for forming hollow objects in elastomer, by means of molds as in claim 1, characterized in that, in the zone corresponding to the one (25) and the other (26) mouth of the feed hole (24) in the core (13) there is a recess (33), (34) in each of the half dies (11), (12), the external hole of said recess being smaller than its internal volume allowing an appendix of material to be formed inside connected to that material which, after mold ing, remains behind in the feed hole (24), so that when the die (10) is opened and the core (13) removed, said ap pendix reacts to the pull on the material lodged in said feed hole (24) causing said material to become detached from the two halves (35-36) of the hollow object(41)which is thus left adhering closely to the two half dies (11) and (12) and receives satisfactory curing.
3. Process for forming hollow objects in elastomer, by means of dies, as in claim 1, characterizes, in that, when the die (10) is closed after extraction of the core (13) fluid Is blown into said die (10) under pressure to assist and maintain, while curing is proceeding, close adherence of the two halves (35-36) of the hollow object (41) to the two half dies (11) and (12) respectively.
4. Process for forming hollow objects in elastomer, by means of dies as in claim 1, characterized in that the die (10) comprises two pairs of chambers (29-31) and (30-32) respectively for the two pairs of halves (35-36), (37-38) of the two hollow objects to permit their simultaneous production, the feed hole (24) in the core (13) being situated between the two pairs of chambers (29-31) and (30-32), the lateral channels (27), (28) communicating with said feed hole (24), one (27) extending from one chamber (29), for one object, to the other chamber (30) alongside, for the second object, and the other channel (28) extending from one chamber (31),for the first object, to the chamber (32) alongside, for the second object.
5. Process for forming hollow objects in elastomer, by means of dies as in claim 1, characterized in that one of the two half dies (11) and (12) comprises a grip slide for supporting the nozzles used for blowing the fluid under pressure into the die while the curing process is proceeding, and allowing them to translate.
6. Process for forming hollow objects in elastomer, by means of dies as in claim 5, characterized in that any piece to be inserted, such as the threaded ring for hot water bottles for example, is associated to the nozzles used for blowing in fluids.
7. Process for forming hollow objects in elastomer, by means of dies as in claim 1, characterized in that the core (13) is supported by a slide moving back and forth perpendicularly to the direction in which the die (10) opens and closes.
PCT/IT1986/000094 1986-11-06 1986-12-29 Process for forming hollow objects, by injection and curing, in elastomer with closely adhering dies WO1988003473A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
KR1019880700753A KR890700078A (en) 1986-11-06 1986-12-29 A method of forming a hollow body by injecting and curing an elastomer with close-die dies.
DK356388A DK356388A (en) 1986-11-06 1988-06-28 PROCEDURE FOR MANUFACTURING HOLE OBJECTS IN ELASTOMER MATERIAL BY INJECTION AND CURRENCY WITH TAKEN CONNECTED FORMS
NO882904A NO882904L (en) 1986-11-06 1988-06-29 PROCEDURE FOR THE FORMATION OF HOLE ARTICLES IN ELASTOMER WITH CLOSELY PRESSED PRESSURE FORM INJECTION AND CURING

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT22255A/86 1986-11-06
IT8622255A IT1206351B (en) 1986-11-06 1986-11-06 PROCESS FOR THE FORMATION OF ELASTOMER CABLE OBJECTS, INJECTION AND VULCANIZATION, WITH HIGH-ADHERENCE MOLDS.

Publications (1)

Publication Number Publication Date
WO1988003473A1 true WO1988003473A1 (en) 1988-05-19

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ID=11193734

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IT1986/000094 WO1988003473A1 (en) 1986-11-06 1986-12-29 Process for forming hollow objects, by injection and curing, in elastomer with closely adhering dies

Country Status (4)

Country Link
KR (1) KR890700078A (en)
AU (1) AU6845187A (en)
IT (1) IT1206351B (en)
WO (1) WO1988003473A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0683031A2 (en) * 1994-05-21 1995-11-22 Siegfried Hofmann GmbH Werkzeugbau Method for manufacturing multi-part injection moulded objects and device for carrying out the method
EP0867266A2 (en) * 1997-03-26 1998-09-30 Takata Corporation Resin bag and manufacturing method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB839759A (en) * 1955-08-25 1960-06-29 Harvey Neil Ansell Improvements in or relating to articles made from rubber or rubber-like materials
FR2114604A5 (en) * 1970-11-13 1972-06-30 Exxon Research Engineering Co
US3933967A (en) * 1973-02-20 1976-01-20 Taylor Don A Method of making seamless hollow molded articles
US4028042A (en) * 1973-08-14 1977-06-07 Dunlop Limited Moulding apparatus
GB2042412A (en) * 1979-02-19 1980-09-24 Desma Werke Gmbh Moulding hollow articles

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB839759A (en) * 1955-08-25 1960-06-29 Harvey Neil Ansell Improvements in or relating to articles made from rubber or rubber-like materials
FR2114604A5 (en) * 1970-11-13 1972-06-30 Exxon Research Engineering Co
US3933967A (en) * 1973-02-20 1976-01-20 Taylor Don A Method of making seamless hollow molded articles
US4028042A (en) * 1973-08-14 1977-06-07 Dunlop Limited Moulding apparatus
GB2042412A (en) * 1979-02-19 1980-09-24 Desma Werke Gmbh Moulding hollow articles

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0683031A2 (en) * 1994-05-21 1995-11-22 Siegfried Hofmann GmbH Werkzeugbau Method for manufacturing multi-part injection moulded objects and device for carrying out the method
EP0683031A3 (en) * 1994-05-21 1996-09-11 Siegfried Hofmann Gmbh Werkzeu Method for manufacturing multi-part injection moulded objects and device for carrying out the method.
EP0867266A2 (en) * 1997-03-26 1998-09-30 Takata Corporation Resin bag and manufacturing method thereof
EP0867266A3 (en) * 1997-03-26 1999-06-09 Takata Corporation Resin bag and manufacturing method thereof
US6044629A (en) * 1997-03-26 2000-04-04 Takata Corporation Method of manufacturing resin bag

Also Published As

Publication number Publication date
IT8622255A0 (en) 1986-11-06
KR890700078A (en) 1989-03-02
AU6845187A (en) 1988-06-01
IT1206351B (en) 1989-04-14

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