JP2010195239A - Cut, sewn and laminated extensible structure of occupant protection device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To extend an extensible curtain in response to an accident, in which extension of the extensible curtain is desired in the case of shocks of a vehicle and roll-over of the vehicle, or in both cases. <P>SOLUTION: This extensible occupant protection device 14 of a vehicle includes woven panels 41, arranged so that one of them is above the other, and having a first side panel 40 and a second side panel 42. The side panels 40, 42 are not covered or laminated on any face. A sewing part 58 extends through the first panel 40 and the second panel 42 in a manner that one of them is above the other, and connects the panels with each other. A film layer 74 is laminated on the woven panel 41, and covers the outer face of the woven panel and the sewing part 58. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an occupant protection device for an expandable vehicle that is cut, stitched and laminated.

  It is known to expand expandable vehicle occupant protection devices to help protect vehicle occupants. Examples of expandable vehicle occupant protection devices include driver and passenger front side airbags, side airbags, and expandable knee bolsters. One particular type of expandable vehicle protection device is an expandable curtain.

  The expandable curtain expands in response to the occurrence of an accident in which the expandable curtain is desired to expand, such as a vehicle impact, vehicle rollover, or both. The expandable curtain extends between the vehicle side structure and the vehicle occupant and moves away from the vehicle roof. Known expandable curtains are expanded by expansion fluid that is directed from the inflator to the expandable curtain via a fill tube.

  Expandable curtains can have a wide variety of structures. For example, expandable curtains can be made of woven panels that are interconnected by any suitable means such as stitching, ultrasonic welding, or adhesive bonding. The gas impermeability of the expandable curtain can be improved by coating the curtain with a material such as silicone or polyurethane via spray coating or knife dispersion. Alternatively, film sheet material, such as polyurethane or copolyester, may be laminated to the expandable curtain to improve gas impermeability.

  The present invention is expandable including a woven panel (41) comprising a first side panel (40) and a second side panel (42) arranged such that one is above the other. The present invention relates to a passenger protection device for a vehicle. The side panels (40, 42) are not coated or laminated on any surface. The stitching (58) extends through and connects the first and second panels (40, 42), one above the other. The film layer (75) is laminated to the woven panel (41) and covers the outer surface of the woven panel and the stitching (58).

  The present invention also relates to an expandable vehicle occupant protection device that includes first and second panels of woven material arranged such that one is above the other. The second panel is configured to leave an exposed portion of the first panel extending around the periphery of the first panel. The sewn portion extends through and connects the first and second panels, one above the other. The first film layer is located above the first panel and covers the sewn portion. The second film layer is located above the second panel and covers the sewn portion. The second film layer also covers the exposed portion of the first panel.

  The present invention also relates to an expandable vehicle occupant protection device that includes first and second panels of woven material arranged such that one is above the other. The sewn portion extends through the first and second panels, one above the other and connects the panels together. The first and second film layers are located above the first and second panels and cover the sewn portion. The first and second film layers include peripheral overlap portions that extend beyond the peripheral edges of the first and second panels. The peripheral overlap portion forms a peripheral edge seal that is one above the other and is laminated together to help prevent the expansion fluid from leaking between the first and second panels.

  The present invention also relates to an expandable vehicle protection device that includes first and second panels of woven material, one above the other. A gasket is disposed between the first panel and the second panel. The gasket includes a narrow strip of film that extends along at least a portion of the periphery of the panel. The sewn portion extends through and connects the first panel, the second panel, and the gasket. The first film layer is above the first panel and the seam. The second film layer is above the second panel and the seam.

  The invention also relates to a method of manufacturing an expandable vehicle occupant protection device. The method includes providing first and second panels of woven material without any coating or laminate on either side. The method also includes disposing the first and second panels such that one is above the other and sewing the panels together. The method also includes laminating a first film layer to the first panel. The first film layer is over and covers the first panel and the seam. The method further includes laminating a second film layer to the second panel. The second film layer is located above and covers the second panel and the stitched portion.

  The invention also relates to a method of manufacturing an expandable vehicle occupant protection device. The method includes providing first and second panels of woven material positioned such that one is above the other. The method also includes configuring the second panel to leave an exposed portion of the first panel that extends around the periphery of the first panel. The method also includes the step of sewing together the first and second panels, one above the other. The method also includes the steps of laminating a first film layer to the first panel and covering the stitching. The method further includes laminating a second film layer on the second panel, an exposed portion of the first panel and covering the stitched portion.

  The invention also relates to a method of manufacturing an expandable vehicle occupant protection device. The method includes providing first and second panels of woven material positioned such that one is above the other. The method also includes the step of sewing together the first and second panels, one above the other. The method also includes providing first and second film layers that are larger than the first and second panels. The method also includes the steps of laminating the first film layer on the first panel and above the stitching portion, and laminating the second film layer on the second panel and above the stitching portion. Including. The method includes laminating overlapping portions of the periphery where one of the first and second film layers extending beyond the periphery of the first and second panels is over the other to form a peripheral edge seal. Is further included.

  The invention further relates to a method of manufacturing an expandable vehicle occupant protection device. The method includes providing first and second panels of woven material and positioning the first and second panels such that one is above the other. The method also includes disposing a gasket between the first panel and the second panel along at least a portion of the periphery of the panel. The method also includes stitching the first panel, the second panel, and the gasket together. The method includes the steps of laminating the first film sheet on the first panel above the sewn portion and laminating the second film sheet on the second panel above the sewn portion. In addition.

1 is a schematic diagram of an apparatus that assists in protecting a vehicle occupant in accordance with the present invention. FIG. 2 is a cross-sectional view of a portion of the device taken generally along line 2-2 of FIG. FIG. 2 is an exploded view of a portion of the apparatus of FIG. FIG. 2 is a plan view of a portion of the apparatus of FIG. FIG. 6 is a plan view showing the manufacture of certain components of the device. FIG. 6 is a plan view showing the manufacture of certain components of the device. It is a top view which shows manufacture of an apparatus. It is a top view which shows manufacture of an apparatus. It is a top view which shows manufacture of an apparatus. It is a graph which shows the pressure of the apparatus with progress of time. 8A-8C are block diagrams illustrating a method of manufacturing a device that helps protect vehicle occupants in accordance with the present invention. FIG. 4 is an exploded perspective view of an apparatus for helping to protect a vehicle occupant according to a second embodiment of the invention. FIG. 10 is a plan view of the apparatus of FIG. 9 in an assembled state. FIG. 11 is a cross-sectional view taken generally along line 11-11 in FIG. FIG. 6 is a block diagram illustrating a method of manufacturing a device that helps protect a vehicle occupant according to a second embodiment of the present invention. FIG. 2 is a block diagram illustrating a method of manufacturing a device that helps protect a vehicle occupant in accordance with the present invention.

The foregoing and other features of the present invention will become apparent to those skilled in the art to which the present invention pertains upon review of the following description of the invention with reference to the accompanying drawings.
The device 10 helps to protect one or more passengers 28 of the vehicle 12. As illustrated in FIGS. 1 and 2, the device 10 includes an expandable vehicle occupant protection device in the form of an expandable curtain 14. The present invention provides alternative configurations such as a driver's front impact airbag, a passenger front impact airbag, a side impact airbag, an expandable seat belt, or an expandable knee bolster. An expandable vehicle occupant protection device (not shown) may be included.

  The expandable curtain 14 is mounted at a location adjacent to the side structure 16 of the vehicle 12 and the vehicle roof 18. The side structure 16 of the vehicle 12 includes a side window 20, an A pillar 30, a B pillar 32, and a C pillar 34. The inflator 24 is connected in fluid communication with the expandable curtain 14 through the fill tube 22. The expandable curtain 14, filling tube 22 and inflator 24 are connected to the vehicle 12 by means 36, such as a bracket.

  In the illustrated embodiment, the expandable curtain 14 extends from the A pillar 30 to the C pillar 34 when expanded. Those skilled in the art will appreciate that alternative configurations can be constructed without departing from the teachings of the present invention. For example, the expandable curtain 14 may be configured to extend from the A pillar 30 to the B pillar 32 of the vehicle 12 or from the A pillar to the D pillar (not shown).

  The filling tube 22 has an end portion that receives fluid from the inflator 24. The filling tube 22 can be directly connected to the inflator 24, or a manifold (not shown) can connect the filling tube to the inflator. The fill tube 22 has a portion disposed within the expandable curtain 14 having an opening (not shown) for directing expansion fluid into the curtain. The filling tube 22 can be made of any suitable material, such as plastic, metal or fabric. As a further alternative, those skilled in the art will appreciate that the fill tube 22 may be eliminated, in which case the inflator 24 may be directly coupled to the expandable curtain 14.

  The inflator 24 holds a stored amount of pressurized expansion fluid (not shown) in the form of a gas that expands the expandable curtain 14. Inflator 24 may alternatively hold a combination of pressurized expansion fluid and an ignitable material that heats the expansion fluid, or using combustion of a gas generating material. A pyrotechnic inflator that generates expansion fluid may be used. As a further alternative, the inflator 24 may be any suitable type or structure that provides a medium for expanding the expandable curtain 14.

  The apparatus 10 includes a housing 26 (FIG. 1) that houses the expandable curtain 14 in a deflated state. The fill tube 22, the contracted expandable curtain 14, and the housing 26 have an elongated configuration and along the vehicle roof 18 above the side window 20 and the side structure 16 of the vehicle 12. It extends along. Filling tube 22, expandable curtain 14 and housing 26 are connected to vehicle 12 by means 36 such as a bracket.

  Referring to FIG. 2, the expandable curtain 14 includes first and second woven panels 40, 42 arranged in a manner that one is above the other. The expandable curtain 14 includes a connection 50 that helps connect the woven panels 40, 42 together to define an expandable volume 60 of the expandable curtain 14. With reference to FIGS. 1 and 2, the connection 50 can include an outer peripheral connection 52 that extends along the periphery 54 of the expandable curtain 14. The connection 50 can also include an internal connection 56 disposed within the outer perimeter 54 of the expandable curtain.

  The connection 50 can help define an expandable chamber 62 within the expandable volume 60. Certain connections 50, such as the internal connection 56, can also form an unexpandable portion of the expandable curtain 14 disposed within the expandable volume 60. In the illustrated embodiment, the connecting portion 50 includes a sewing portion 58 that extends through the first panel 40 and the second panel 42 and connects the panels together.

  Referring to FIG. 2, the expandable curtain 14 includes a gasket 70 disposed between the woven first panel 40 and the second panel 42. The gasket 70 is, for example, in the form of a strip about 50 mm wide that extends along the periphery 54 of the expandable curtain 14, where the connection 50 connects the panels 40, 42 one above the other. I am doing. The gasket 70 prevents gas from escaping between the woven fabric layers 40,42.

  The expandable curtain 14 also includes a first film panel 74 disposed on the first woven panel 40 and a second film panel 76 disposed on the second woven panel 42. including. The first film panel 74 includes the sewn portion 50 and covers the outer surface of the first woven panel 40. The second film panel 74 includes a stitched portion 50 and covers the outer surface of the second woven panel 42. First and second film panels 74, 76 are laminated to first and second woven panels 40, 42, respectively. A gasket 70 is disposed between and laminated to the first and second woven panels 40,42.

  The vehicle 12 includes a sensor (shown at 100 in FIG. 1) that detects the occurrence of an accident where expansion of the expandable curtain 14 is desired, such as side impact, vehicle rollover, or both. When detecting the accident, sensor 100 provides an electrical signal to inflator 24 through lead 102. This electrical signal activates the inflator 24 in a known manner. The inflator 24 discharges fluid under pressure through the fill tube 22 that directs the fluid into the expandable curtain 14.

  The expandable curtain 14 expands expansion fluid from the inflator 24 under pressure. The housing 26 (FIG. 1) is open and the expandable curtain 14 is directed downwards and in the direction in which the vehicle travels forward to the position illustrated in FIGS. On the other hand, it expands away from the roof 18 downward. The expandable curtain 14 is positioned between the side structure 16 of the vehicle 12 and any occupant 28 of the vehicle when expanded.

  The expandable curtain 14 helps protect the vehicle occupant in the event of an accident that, when expanded, causes a vehicle rollover or side impact to the vehicle 12. The expandable curtain 14 helps to absorb impact energy by the curtain when expanded and to distribute the impact energy over a large area of the curtain. The gasket 70 and film panels 74, 76 help maintain the pressure of the expansion fluid in the expandable curtain 14 at a desired level and prevent the expansion fluid from leaking through the panels and seams or seams. Help block.

  In accordance with the present invention, the expandable curtain 14 is a cut, stitched and laminated structure that helps maintain the pressure of the expansion fluid within the curtain and helps prevent the expansion fluid from leaking out of the curtain. have. This structure is 1) cut from uncoated and non-laminated woven raw sheet material, 2) stitched together, and 3) laminated with film to form an effective seal against expandable curtain 14, while Includes a panel over the other. In addition, the structure in which the expandable curtain 14 is cut, stitched, and laminated is efficient in terms of the amount of material used, production time, and manufacturing cost.

  In describing the structure and performance of the expandable curtain of the present invention, reference is made to FIGS. 3-7C show a test configuration of an apparatus manufactured according to the present invention. The configuration of the apparatus shown in FIGS. 3 to 7C is the same as the configuration of the apparatus shown in FIGS. 1 and 2. Therefore, in order to avoid confusion, in FIGS. 3 to 7C, the same components are denoted by the same numbers as those in FIGS. 1 and 2 with the suffix “a” appended to the numbers in FIGS. It will be displayed.

The apparatus 10a of FIGS. 3-7C is expandable in a dimension complementary to a typical “AB” curtain, ie, a curtain extending between the A-pillar 30 (see FIG. 1) and the B-pillar 32 of the vehicle 12. A simple curtain 14a.
Referring to FIGS. 3 and 4, except for the shape and dimensions, the expandable curtain 14a has a structure similar to that shown in FIGS. Thus, the expandable curtain 14a is folded in the same manner as a single woven "butterfly" panel 41 folded at fold line 90 to define woven side panels 40a, 42a. It includes a single butterfly film panel 75 forming side panels 74a, 76a and a gasket 70a. Referring to FIG. 5, a woven butterfly panel 41 is cut from a sheet 80 of woven material in a manner that generates little waste. Since the film panel 75 is the same or substantially the same as the woven panel 41, the film panel can be similarly cut from the sheet of film material 82 in a similar or identical pattern, so Hardly generate.

  Also, according to the present invention, the film panel 75 and the woven panel 41 can be simultaneously cut from their respective sheets. With the woven sheet 80 and the film sheet 82 as shown in FIG. 5, with one on the other, a means (not shown) such as laser cutting is used to woven the panel 41 and the film panel 75. Can be cut at the same time. This makes it unnecessary to perform a separate cutting step. Thereafter, the film panel 75 can be removed from the woven panel 41.

  Referring to FIG. 6, in accordance with the present invention, the gasket 70a is cut from a sheet 84 of gasket material, such as film material, in a pattern that helps reduce debris. The gasket 70a is cut from the film sheet 84 using means such as a die or laser cutting (not shown). Referring to FIGS. 3 and 6, the sheet 84 is combined and cut into a number of separate gasket pieces 86 that form a gasket 70a when placed between the woven side panels 40a, 42a. . As shown in FIG. 6, this allows different gasket pieces 86 to be positioned and telescoped together so that film sheet 84 can be used more efficiently by helping to reduce debris. To do.

  3-7A, to assemble the expandable curtain 14a, a gasket piece 86 is placed on one of the woven side panels 40a, 42a. In the embodiment shown in FIG. 7A, the gasket piece 86 is disposed on the first woven side panel 40a. The woven panel 41 is then folded along the fold line 90 so that the gasket piece 86 is sandwiched between the side panels 40, 42 as shown in FIG. 7B. The woven side panels 40a, 42a and the gasket piece 86 are connected to each other via a connecting portion 50a extending through the side panel and the gasket, that is, a sewing portion 58a. As shown in FIG. 7B, the outer peripheral connection portion 52a extends through the gasket 70a and the side panels 40a and 42a along the peripheral edge 54a of the expandable curtain 14a. The internal connection 56a penetrates the gasket 70a and the side panels 40a, 42a from the peripheral edge 54a of the expandable curtain 14a within the outer periphery of the expandable volume 60a or at a spaced position within the peripheral edge. It is growing.

  When the gasket 70a and the side panels 40a and 42a are connected to each other via the connecting part 50a, the film panel 75 is arranged to be above the first and second side panels 40a and 42a, respectively. . The film panel 75 and gasket 70a are then laminated to the woven side panels 40a, 42a through the application of heat and pressure through known means, such as a heated roller or platen. Desirably, no curing is required when the materials are laminated together.

  Film material and gasket 70a is suitable for making expandable curtain 14a according to the methods described herein and is capable of exhibiting desirable properties such as leakage prevention, adhesion and anti-blocking performance. Plastic or elastomeric film material.

  The film material typically consists of an adhesive layer and a surface layer. The surface layer has a melting temperature substantially above the adhesive layer. This is typically referred to as Duplex or Co-ex film. The gasket and adhesive layer should have similar thermal properties. The film material can also consist of two separate films, firstly an adhesive film and secondly a surface film. In either case, the adhesive film is placed between the woven panel and the surface film. The gasket film is placed between the sides of the woven fabric.

  The materials used to manufacture the woven panels 40a, 42a are selected to provide the desired performance characteristics, such as strength, abrasion resistance, drilling resistance, and gas impermeability. For example, the panel 41 can be made from fabric woven in a 1 × 1 plain weave pattern using conventional weaving methods such as rapier, air jet or water jet weaving. In one example, the yarn used to make panel 41 may be 470 dtex (470 g per 10,000 m) polyamide 66 (PA66) nylon yarn. This structure can have a relatively low weave density, such as 18 picks / cm and 18 ends / cm. In another example, the yarn used to make the woven panel 41 can be a 350 dtex PA66 nylon yarn having a relatively low weave density, such as 21 picks / cm and 21 ends / cm.

  The yarn used to connect the side panels 40a, 42a to each other can also be PA66 nylon yarn, such as T135 (135 g per 1,000 m) PA66 nylon yarn or T90PA66 nylon yarn. In one exemplary form, T135PA66 yarn can be used in a double needle lock stitch pattern with a needle separation of about 3 mm.

When manufactured according to the above description, the expandable curtain 14a is configured to exhibit very good performance in terms of blocking, or in other words, preventing leakage. Film panel 75 helps block leakage of expansion fluid through woven panel 41 and through the seam 58a and the area of the panel through which the seam extends through. The gasket 70a also blocks expansion fluid from leaking through the area of the panel that passes through and adjacent to the seam 58a and through which the seam extends. help. The gasket 70a provides the additional beneficial effect of helping to block expansion fluid from between the side panels 40a, 42a, one above the other.
EXAMPLE Test curtains were created to evaluate and demonstrate the effects of the curtain structure described above. The test curtain had the same basic form as the cut, stitched and laminated shown in FIGS. In this construction, the woven panel was cut from a conventional uncoated, non-laminated 350 dtex PA66 nylon fabric woven in a 1 × 1 plain weave having a weave density of 23 picks / cm and 23 ends / cm. A gasket consisting of two layers of Collano® 22.000 adhesive film at a weight of about 30 g / m ² was placed between the woven panels, one above the other. The panel and gasket material were sewn together using T90PA66 nylon suture at 50 stitches per decimeter. Next, a set of curtains was laminated to a Corano (registered trademark) 55.504C duplex film at a weight of 57 g / m ² . The second set of curtains was laminated to the Korano® coextruded film V763 at a weight of 40 g / m ² . Corano® adhesive, duplex and coextruded films are commercially available from Collano, Inc., Greenville, South Carolina, USA.

拡張カーテンの圧力を維持する基準は、車両のアーキテクチャ、及び拡張カーテンの判断基準となる特定の政府及び自動車メーカの標準のような、多岐にわたるファクタに依存して変更可能である。例えば、一般的に云って、大きい寸法のロールオーバ拡張カーテンの場合、展開後、６秒にて、最高圧力の５０％を維持することが望ましい。 The curtain was tested using a deployment simulation device. Helium was used to pressurize the bag to about 140 kPa. The time taken to reach this pressure from 0 kPa is typically about 50 milliseconds (see FIG. 7D). After deployment, the curtain was expanded to 70 kPa with factory air and the pressure drop after 6 seconds was measured. These test results are listed in Table 1 below.

The criteria for maintaining expansion curtain pressure can vary depending on a variety of factors, such as the vehicle architecture and the specific government and automaker standards that make up the extension curtain. For example, generally speaking, for large dimension rollover expansion curtains, it is desirable to maintain 50% of the maximum pressure 6 seconds after deployment.

  In general, for any particular expandable curtain configuration, the volumetric flow rate of expansion fluid from the expansion curtain is typically within the area of the curtain that is subject to high stress both during and after deployment. It ’s the best. Examples of these large stress areas may be areas adjacent to or near where the inflator extends into and is secured to the expandable curtain.

  The volumetric flow rate of the expansion fluid through the large stress areas of these expandable curtains is independent of the size or volume of the curtain itself. However, the size or volume of the expandable curtains has a large effect on the amount of curtain decompression due to the volumetric flow of expansion fluid through the large stress regions of these curtains. For this reason, those skilled in the art will assume that the volumetric flow through the high stress region is equal, and the pressure of the expansion fluid in the curtain is more rapid with a smaller low volume curtain than with a larger high volume curtain. It will be understood that it descends.

  The test configurations used to perform the tests shown in Table 1, ie, the configurations shown in FIGS. 7A-7C, are far less than 10% by volume, compared to conventional AC pillar expandable curtains. Small. For this reason, those skilled in the art will appreciate that the pressure of the expansion fluid in the test curtain drops much more rapidly than in the form of a full sized AC pillar curtain. For this reason, the expandable curtain structure shown in FIGS. 1-7c exhibits excellent performance in terms of the properties of retaining gas and preventing leakage.

  From the above description, one of ordinary skill in the art will understand that the embodiment of the present invention shown in FIGS. 3-7 discloses an expandable curtain 14a having a design that exhibits desirable gas retention properties. Like. In terms of manufacturing, the expandable curtain design is efficient and economical. The expandable curtain 14a utilizes uncoated, non-laminated woven fabric side panels 40a, 42a, one above the other, before assembling the curtain. When the uncoated, non-laminated side panels 40a, 42a, one above the other, are sewn together, the film panel 75 is laminated on the outer surface of the panel and covers the panel and the sewn portion 58a. The film panel 75 provides an effective seal that helps to block or resist leakage of gas through the panels 40a, 42a and through the stitching 58a. A gasket 70a laminated between the side panels 40a, 42a helps to strengthen or improve this seal.

  Desirably, the film panel 75 can be applied simultaneously, does not require curing, and requires little cooling time, which will help reduce manufacturing time. The fact that the woven panel 41 does not have any coating further helps to reduce manufacturing time since the coating typically requires significant curing time.

  In addition, from the above description, those skilled in the art will recognize that the embodiment of the present invention shown in FIGS. It will be understood that this also relates to More particularly, referring to FIG. 8A, a method 200 of manufacturing an expandable vehicle occupant protection device (eg, expandable curtain) includes first and second woven panels, first and second. Providing 202 a film panel. At step 204, a gasket is provided and placed between the woven panels, one above the other. At step 206, the woven panels and gaskets are connected to each other by stitches that extend through the panels and gaskets. The method 200 also includes the step 210 of positioning the first and second film panels so that they are respectively above the outer surfaces of the first and second woven panels sewn together. Method 200 further includes laminating the gasket and film panel to the woven panel.

  The method 200 shown in FIG. 8A and described above relates to manufacturing a curtain that can be expanded to include the properties of holding and preventing leakage of the gas described and illustrated above. In accordance with the present invention, the method 200 of manufacturing the expandable curtain 14 also includes improving the efficiency and economy associated with manufacturing the expandable curtain 14.

  For example, referring to FIG. 8B, providing 202 first and second woven panels and first and second film panels comprises providing 220 a sheet of woven fabric material and above the fabric sheet. Providing 222 a film sheet. Step 202 further includes a step 224 of simultaneously cutting the woven and film sheets, one above the other to form first and second woven panels and first and second film panels.

  As another example, referring to FIG. 8C, the step 210 of providing and placing a gasket cuts a sheet of gasket material into a nested manner that reduces or minimizes the amount of material waste. Forming a gasket segment. Step 210 also includes a step 232 of placing the segments between the woven panels to form a continuous gasket.

  A second embodiment of the present invention is shown in FIGS. The second embodiment of the present invention is the same as the first embodiment of the present invention shown in FIGS. Therefore, to avoid confusion, suffixes “b” are appended to the numbers in FIGS. 9-11 to indicate similar components in FIGS. 9-11, and numbers similar to those in FIGS. 1-8C. It is shown.

  The expandable curtain 14b of the second embodiment cuts, stitches and helps to maintain the pressure of the expansion fluid in the curtain and to prevent the expansion fluid from leaking out of the curtain. It has a laminated structure. This structure 1) cut unwoven and non-laminated raw material sheet material, 2) stitched together, and 3) laminated to film to form an effective seal against expandable curtain 14b , One panel over the other. In addition, the structure in which the expandable curtain 14b is cut, stitched, and laminated is efficient in terms of the amount of material used, production time, and manufacturing cost.

  With reference to FIGS. 9-11, the expandable curtain 14b includes the steps of bringing the panels 40b, 42b and the film panels 74b, 76b one above the other. The expandable curtain 14b does not include a gasket. The first and second panels 40b, 42b are cut from a sheet of material woven in a manner that does not generate debris. As best shown in FIGS. 9 and 10, the first and second panels 40b, 42b are not identical. The first panel 40b is slightly larger than the second panel 42b and has a form slightly different from the second panel form. As shown in FIG. 10, this size and configuration difference results in a peripheral overlap portion 250 of the first panel 40b that extends along the peripheral edge 54b of the expandable curtain 14b.

  The first and second film panels 74b and 76b of the second embodiment have the same or substantially the same form as the first panel 40b. To assemble the expandable curtain 14b, the woven panels 40b, 42b are arranged so that one is above the other and connected to each other via a connection 50b, i.e. a stitching 58b extending through the panel. Is done. As shown in FIG. 11, the sewn portion 58b of the main connecting portion 52b extends through the panels 40b and 42b along the peripheral edge 54b of the expandable curtain 14b.

  When the panels 40b and 42b are connected to each other via the connection portion 50b, the first and second films 74b and 76b are arranged such that one of the first and second panels 40b and 42b is above the other, respectively. Placed in. The first and second films 74b, 76b are then laminated to the woven panels 40b, 42b via application of heat and pressure through known means such as heated rollers or platens. Desirably, no curing is required when laminating the films 74b, 76b and the gasket 70b.

  As shown in FIG. 11, in accordance with the second embodiment of the present invention, the second film 76b is configured to fit the first panel 40b and is positioned above the second panel 42b. Are stacked on the peripheral overlapping portions of the second panel 42b and the first panel 40b. The second film 76b covers the sewing portion 58b and extends beyond the end edge of the second panel 42b. Thus, the second film 76b forms a peripheral edge seal 252 that helps block expansion fluid from leaking between the panels 40b, 42b, one above the other.

  The film material made to use the first and second films 74b, 76b is suitable for manufacturing the expandable curtain 14b according to the methods described herein, and is suitable for leak prevention, It can be any plastic or elastomeric film material that can exhibit desirable properties in terms of adhesion and antiblock performance.

  For example, the first and second films 74b and 76b can be made of an adhesive film and a surface film. The adhesive film and the surface film of the first and second films 74b, 76b are composed of separate film layers arranged to be above their corresponding panels 40b, 42b of the expandable curtain 14b. Alternatively, the adhesive film layer is disposed at a position adjacent to the panel. Alternatively, the first and second films 74b, 76b may comprise a duplex film consisting of a single sheet having an adhesive film layer and a surface film layer. In this case, the duplex first and second surface films 74b, 76b are arranged to be above the corresponding panels 40b, 42b of the expandable curtain 14b and the adhesive film layer is arranged adjacent to the panel. Is done.

  The materials used to manufacture the woven panels 40b, 42b are selected to provide desirable performance characteristics such as strength, abrasion resistance, puncture resistance and gas impermeability. For example, the first and second panels 40b, 42b are manufactured from fabric woven in a 1 × 1 plain weave pattern using conventional weaving methods such as rapier, air jet, or water jet weaving. Can do. In one example, the yarn used to make panels 40b, 42b may be 470 dtex (470 g per 10,000 m) polyamide 66 (PA66) nylon yarn. This structure can have a relatively low weave density, such as 18 picks / cm and 18 ends / cm. In another example, the yarn used to make the panels 40b, 42b may be 350 dtex PA66 nylon yarn having a relatively low weave density, such as 23 picks / cm and 23 ends / cm.

  The yarn used to connect the panels 40b, 42b to each other can also be PA66 nylon yarn, such as T135 (135 g per 1,000 m) PA66 nylon yarn or T90PA66 nylon yarn. In one exemplary form, T135PA66 yarn can be used in a double needle lockstitch pattern with a needle separation of about 3 mm.

  Also, as in the embodiment of FIGS. 3-7C, the expandable curtain 14b of FIGS. 9-11 is manufactured with a single woven panel of the first and second panels 40b, 42b. In addition, the first and second films 74b and 76b may have a “butterfly” structure in which a single film sheet is manufactured. A single woven panel is folded along the fold line and the first and second panels 40b, 42b are positioned adjacent to each other and one above the other. Next, the first and second panels 40b and 42b are sewn together. The single film sheet is then wound or folded around the panels 40b, 42b sewn together, with the first film 74b above the first panel 40b and the second film 76b being It should be above the second panel 42b. Next, the films 74b and 76b are laminated on the panels 40b and 42b.

In this case, the portion of the single woven panel that forms the second panel 42b will be smaller than the portion of the single woven panel that forms the first panel 40b. As a result, peripheral overlap portions 250 are formed when the panels are folded so that one is above the other. The portion of the single film sheet that forms both the first and second films 74b, 76b will be configured identically to the first panel 40b. The second panel 42b may be configured to be smaller than the portion of the single woven panel that forms the first panel 40b.
EXAMPLE Three sets of three test curtains were created to evaluate and demonstrate the effect of the curtain structure of FIGS. All of these sets shall have the same basic form--the form shown in FIGS. 9-11, with the difference being the material used to make the curtain and the manner in which the curtain is sealed against leakage. It is. Three sets of curtains were manufactured as follows.
1. First Set Curtain The first set of curtains is expandable cut from a panel woven from a conventional 585 dtex PA66 fabric woven into a 1 × 1 plain weave at a weave density of 17 picks / cm and 17 ends / cm. Curtain included. One side of the fabric was coated with 25 g / m ² of silicone. The silicone-coated side of the panel was placed on the side of the curtain. The panels were sewn together using T90PA66 sutures in a double needle lock stitch pattern with a stitch count of 50 stitches / 100 mm. The film was not laminated on the curtain.
2. A second set of curtains second set of curtains, possible extensions cutting the woven panel from 17 conventional 585dtexPA66 fabrics woven in weave density of picks / cm and 17 ends / cm to 1 × 1 plain weave Curtain included. The fabric was not covered. The woven panels had the same form, i.e. no peripheral overlap was formed. The panels were sewn together using T90PA66 sutures in a double needle lock stitch pattern with a stitch count of 50 stitches / 100 mm. Next, both sides of the expandable curtain were laminated with a duplex foil, the adhesive layer was a polyurethane material, and the surface layer was a copolyester.
3. Third Set Curtain The third set of curtains included an expandable curtain cut, stitched and laminated according to the present invention as shown in FIGS. 9-11. For this reason, these curtains shall include the peripheral overlapping part. A third set of expandable curtains was made of woven panels cut from a conventional 585 dtex PA66 fabric woven into a 1 × 1 plain weave at a weave density of 17 picks / cm and 17 ends / cm. The fabric was not covered. The woven panels were then sewn together along their periphery and laminated with duplex foil sheets on both sides, where the adhesive layer was a polyurethane material and the surface layer was a copolyester. The duplex foil sheet covered the entire first and second panels, thus forming a peripheral edge seal.

All three sets of curtains were expanded with 35 kPa factory air and the leakage of each curtain was measured. These measurement results are listed in Table 1 below.

  As shown in Table 1, the expandable curtain of the third set of curtains cut, stitched and laminated according to the present invention to include a peripheral edge seal is a property of preventing gas retention and leakage. Showed significantly improved performance.

  From the above description, those skilled in the art will appreciate that the embodiment of the present invention shown in FIGS. 9-11 discloses an expandable curtain 14b designed to exhibit desirable gas retention performance. It will be understood. With respect to manufacturing, the expandable curtain design is efficient and economical. The expandable curtain 14b utilizes uncoated and non-laminated woven fabric panels 40b, 42b, one above the other before assembling the curtain. When the uncoated and non-laminated panels 40b, 42b, one above the other, are sewn together, the film layers 74b, 76b are laminated on the outer surface of the panel to cover the panel and the sewn portion 58b. . The film layers 74b, 76b provide an effective seal that helps block or resist leakage of gas through the panels 40b, 42b and through the seam 58b. A peripheral overlap 250 covered by the laminated second film layer 76b helps to enhance or improve this seal.

  Desirably, the first and second film layers 74b, 76b can be applied simultaneously, require no curing, and require little cooling time, which reduces manufacturing time. Will help. The fact that the panels 40b, 42b do not have any coating further helps to reduce manufacturing time since the coating typically requires significant cure time.

  From the above description, those skilled in the art will recognize that the embodiment of the present invention shown in FIGS. 9-11 is not limited to the manufacture of the expandable curtain 14b itself, but also the method of manufacturing the expandable curtain. It will be understood that this is also relevant. More particularly, referring to FIG. 12, a method 300 of manufacturing an expandable vehicle occupant protection device (e.g., an expandable curtain) includes a first arranged with one above the other. And providing a second woven panel material 302. The method 300 also includes a step 304 of configuring the second panel to leave an exposed portion of the first panel extending around the periphery of the first panel. The method 300 also includes a step 306 of sewing together the first and second panels, one above the other. The method 300 also includes a step 308 of laminating the first film layer on the surface of the first panel opposite the second panel. The first film layer also covers the seam. The method 300 further includes a step 310 of laminating a second film layer on the surface of the second panel opposite the first panel and laminating on the exposed portion of the first panel. The second film layer also covers the seam.

  A third embodiment of the present invention is shown in FIGS. 13-15B. The third embodiment of the present invention is the same as the first and second embodiments of the present invention shown in FIGS. Therefore, to avoid confusion, the suffix “c” is associated with the numbers in FIGS. 13-15B to display similar components, and numbers similar to those in FIGS. Use at.

  The expandable curtain 14c of the second embodiment cuts, stitches, and helps maintain the pressure of the expansion fluid within the curtain and help prevent the expansion fluid from leaking out of the curtain. It has a laminated structure. This structure is 1) cut from uncoated and non-laminated woven raw sheet material, 2) stitched together, and 3) laminated with film to form an effective seal against expandable curtain 14c, Includes a panel over the other. Further, the structure in which the expandable curtain 14c is cut, stitched and laminated is efficient in terms of the amount of material used, production time, and manufacturing cost.

  Referring to FIGS. 13-15B, the expandable curtain 14c includes panels 40c, 42c, one over the other, and film panels 74c, 76c. The expandable curtain 14c of FIG. 15A does not include a gasket, while the expandable curtain of FIG. 15C includes a gasket 70c. The first and second panels 40c, 42c are cut from a sheet of woven material in a manner that produces little waste.

  As shown in FIGS. 13 and 14, the first and second panels 40c and 42c are the same in terms of form and dimensions. The first and second film panels 74c and 76c of the second embodiment are also the same in terms of form and size. In accordance with the present invention, the first and second film panels 74c, 76c are configured and dimensioned larger than the first and second panels 40c, 42c. As a result, the first and second film panels 74c, 76c include peripheral overlapping portions 340, 342, respectively, when positioned so as to be above the panels 40c, 42c.

  To assemble the expandable curtain 14c, the woven panels 40c, 42c are arranged so that one is above the other and through the connection 50b, i.e. the stitching 58b extending through the panel. Connect to each other. As shown in FIGS. 15A and 15B, the sewn portion 58c of the outer peripheral connection portion 52c extends through the panels 40c and 42c along the peripheral edge 54c of the expandable curtain 14c. In the embodiment of FIG. 15B, the sewing portion 58c of the outer peripheral connection portion 52c also extends through the gasket 70c.

  When the panels 40c and 42c are connected to each other via the connection portion 50c, the first and second films 74c and 76c are arranged to be above the first and second panels 40c and 42b, respectively. . The first and second films 74c, 76c are then laminated to the woven panels 40c, 42c through the application of heat and pressure through known means, such as heated rollers or platens. Desirably, no curing is required when laminating films 74c, 76c and gasket 70c.

  As shown in FIGS. 15A and 15B, according to the third embodiment of the present invention, the peripheral overlap portions 340 and 342 are stacked on each other, and thus around the outer periphery of the first and second panels 40c and 42c. A peripheral edge seal 344 is formed. In this way, the first and second films 74c, 76c help block the expansion fluid from leaking between the panels 40c, 42c, one above the other.

  The film material used to produce the first and second films 74c, 76c is suitable for producing the expandable curtain 14c according to the methods described herein and is suitable for leak prevention, adhesion, And any plastic or elastomeric film material that exhibits desirable properties, such as anti-blocking performance.

  For example, the first and second films 74c and 76c can include an adhesive film and a surface film. The adhesive film and the surface film of the first and second films 74c, 76c consist of separate film layers arranged so as to be above their corresponding panels 40c, 42c of the expandable curtain 14c. The agent film layer is disposed at a position adjacent to the panel. Alternatively, the first and second films 74c, 76c may consist of a duplex film consisting of a single sheet having an adhesive film layer and a surface film layer. In this case, the duplex first and second surface films 74c, 76c are arranged to be above their corresponding panels 40c, 42c of the expandable curtain 14c and the adhesive film layer is adjacent to the panel. Placed in position.

  The materials used to make the woven panels 40c, 42c are selected to provide the desired performance characteristics such as strength, abrasion resistance, drilling resistance, and gas impermeability. For example, the first and second panels 40c, 42c may be manufactured from fabric woven in a 1x1 plain weave pattern using conventional weaving methods such as rapier, air jet, or water jet weaving methods. it can. In this example, the yarn used to make panels 40c, 42c may be 470 dtex (470 g per 10,000 m) polyamide 66 (PA66) nylon yarn. The structure can have a relatively low weave density, such as 18 picks / cm and 18 ends / cm. In another example, the yarn used to make the panels 40c, 42c can be 350 dtex PA66 nylon yarn having a relatively low weave density, such as 23 picks / cm and 23 ends / cm.

  The yarn used to connect the panels 40c, 42c to each other can also be T135 (135 g per 1,000 m) PA66 nylon yarn or T90PA66 nylon yarn. In one exemplary form, the T135PA66 thread can be used in a double needle lock stitch pattern with a needle separation of about 3 mm.

  Similarly to the embodiment of FIGS. 3-7C and 9-11, the expandable curtain 14c of FIGS. 13-15B has a single woven first and second panels 40c, 42c. Can have a “butterfly” structure in which the first and second films 74c, 76c are manufactured in a single film sheet. The single woven panel is folded along the fold line and the first and second panels 40c, 42c are positioned adjacent to each other and one above the other. Next, the first and second panels 40c and 42c are sewn together. The single film sheet is then wound or folded around the panels 40c, 42c sewn together, with the first film 74c above the first panel 40c and the second film 76c being the second. So that it is above the panel 42c. Next, the films 74c and 76c are laminated on the panels 40c and 42c.

  In this case, the first and second films 74c and 76c formed on the butterfly will be larger than the first and second panels 40c and 42c formed on the butterfly. As a result, when the first and second panels 40c and 42c are sandwiched between them and the panels are folded so that one of them is above the other, peripheral overlapping portions 340 and 342 are formed. Is done.

  From the above description, one of ordinary skill in the art will appreciate that the embodiment of the present invention shown in FIGS. 13-15B discloses an expandable curtain 14c designed to exhibit desirable gas retention properties. . In terms of manufacturing, the expandable curtain design is efficient and economical. The expandable curtain 14c utilizes uncoated and non-laminated woven fabric panels 40c, 42c, one above the other before assembling the curtain. When the uncovered and non-laminated panels 40c, 42c, one above the other, are sewn together, the film layers 74c, 76c are laminated on the outer surface of the panel to cover the panel and the sewn portion 58b. Film layers 74c, 76c provide an effective seal that helps block or resist gas leakage through panels 40c, 42c and through stitching 58c. A peripheral edge seal 344 formed by the stacked peripheral overlap portions 340, 342 helps to enhance or improve the seal.

  Desirably, the first and second film layers 74c, 76c can be applied simultaneously, require no curing, and require little cooling time, which reduces manufacturing time. Will help. The lack of any coating on the panels 40c, 42c further helps to reduce manufacturing time since the coating typically requires significant time for curing.

  From the above description, those skilled in the art will appreciate that the embodiments of the present invention shown in FIGS. 13-15 relate not only to the structure of the expandable curtain 14c itself, but also to the method of manufacturing the expandable curtain. It will be understood that it is. More particularly, referring to FIG. 16, a method 350 of manufacturing an expandable vehicle occupant protection device (eg, an expandable curtain) is woven arranged so that one is above the other. Providing 352 providing first and second panels of material. The method 350 also includes a step 354 of sewing together the first and second panels, one above the other. The method 350 also includes a step 356 of providing first and second film layers that are larger than the first and second woven panels. The method 350 also includes a step 358 of laminating the first film layer to the first woven panel and above the stitching. The method 350 also includes a step 360 of laminating the second film layer to the second woven panel and above the stitching. The method 350 further includes the step 362 of laminating the peripheral overlap portions of the first and second film layers together to laminate the peripheral edge seal of the expansion curtain.

  In addition, from the above description, those skilled in the art will recognize that the embodiments of the present invention shown in FIGS. It will be understood that this also relates to a method of manufacturing an expandable curtain. More particularly, referring to FIG. 17, a method 400 of manufacturing an expandable vehicle occupant protection device (eg, an expandable curtain) includes first and second unwoven and non-laminated woven materials. Providing step 402. The method 400 also includes a step 404 of sewing together the first and second panels, one above the other. The method 400 further includes the step 406 of laminating a film layer to the panel and covering the stitching.

  From the above description of the invention, those skilled in the art will perceive improvements, changes and modifications. For example, the cut, stitched and laminated structure of the present invention is a type of expansion other than an expandable curtain, such as a front airbag, a side airbag, an expandable knee bolster, or an expandable seat belt. Can be used to manufacture possible vehicle occupant protection devices. Such improvements, changes and modifications within the skill of the art are intended to be covered by the appended claims.

DESCRIPTION OF SYMBOLS 10 Expandable vehicle occupant protection device 10a Expandable vehicle occupant protection device 12 Vehicle 14 Expandable curtain 14a Expandable curtain 16 Side structure 18 of vehicle 12 Roof 20 of vehicle Side window 22 Filling Tube 24 Inflator 26 Housing 28 Passenger 30 A-pillar 32 B-pillar 34 C-pillar 36 Bracket-like means 40 First panel 40a Woven side panel 41 Butterfly panel 42 Second panel 42a Woven side panel 50 Connection Part 52 outer peripheral connection part 52a outer peripheral connection part 54 expandable curtain outer periphery 54a peripheral edge 56 of expandable curtain 14a internal connection part 56a internal connection part 58 sewing part 58a sewing part 60 expandable volume 60a expandable volume 62 Expandable chamber 70 Gasket 70a Gasket 74 Film Panel 74a side panel 75 butterfly panel 76 film panel 76a side panels 80 woven sheets 82 film sheet 84 sheet 86 Gasket strip 90 fold line 100 sensor 102 wire gasket material of the material of the material of the film of the film

Claims (28)

In an expandable vehicle occupant protection device,
A woven panel comprising first and second side panels arranged such that one is above the other;
Before being sewn together, one without any coating or laminate on either side extends through the first and second side panels above the other and connects the panels together The sewn part,
An expandable vehicle occupant protection device comprising a film layer laminated to the woven panel and covering the woven panel and the stitched portion. The expandable vehicle occupant protection device according to claim 1,
The second side panel is configured to leave an exposed portion of the first side panel extending around the periphery of the first side panel, and the film layer comprises the first side panel An expandable vehicle occupant protection device for covering the exposed portion of the panel. An expandable vehicle occupant protection device according to claim 2,
The exposed portion of the first side panel extends around the periphery of the first side panel, where the first and second side panels are connected to each other by a sewn portion. Expandable vehicle occupant protection device. An expandable vehicle occupant protection device according to claim 2,
The film layer forms an expandable vehicle that forms a peripheral edge seal that helps to prevent expansion fluid from leaking between the first and second side panels over which the one is above the other. Passenger protection device 0. An expandable vehicle occupant protection device according to claim 2,
The film layer is laminated on the outer surface of the first panel, the outer surface of the second panel, and the exposed portion of the first panel, and the exposed portion is a part of the inner surface of the first panel. An expandable vehicle occupant protection device comprising:   6. The expandable vehicle occupant protection device according to claim 5, wherein the film layer is laminated via heat and pressure.   2. The expandable vehicle occupant protection device according to claim 1, wherein the film is disposed between the first and second side panels and extends along at least a portion of a peripheral edge of the side panels. An expandable vehicle occupant protection device further comprising the gasket comprising a narrow strip.   8. The expandable vehicle occupant protection device of claim 7, wherein the gasket is laminated to the first and second side panels.   9. The expandable vehicle occupant protection device of claim 8, wherein the film layer and the gasket are laminated simultaneously via heat and pressure. The expandable vehicle occupant protection device according to claim 7,
The gasket leaks expansion fluid from between the first and second side panels, one above the other, and through the portion of the side panel through which the seam extends. An expandable vehicle occupant protection device that helps block out of. The expandable vehicle occupant protection device according to claim 7,
The gasket comprises an expandable vehicle comprising a narrow strip segment of gasket material disposed between the first and second side panels along a periphery of the first and second side panels. Passenger protection device. The expandable vehicle occupant protection device according to claim 1,
The film layer is configured to have a peripheral overlap portion extending beyond the peripheral edges of the first and second side panels, and the peripheral overlap portion is one layer above the other and laminated to each other. , An expandable vehicle occupant protection device that forms a peripheral edge seal that helps to block expansion fluid from leaking between the first and second panels. An expandable vehicle occupant protection device according to claim 12,
And further comprising a gasket disposed between the first side panel and the second side panel, the gasket comprising a narrow strip of film extending along at least a portion of the periphery of the side panel. An expandable vehicle occupant protection device comprising:   14. The expandable vehicle occupant protection device according to claim 13, wherein the film layer and gasket are simultaneously laminated to the side panel via heat and pressure.   2. The expandable vehicle occupant protection device of claim 1, wherein the film layer comprises an adhesive film layer and a surface film layer.   2. The expandable vehicle occupant protection device of claim 1, wherein the adhesive film layer comprises a polyurethane film layer and the surface film layer comprises a copolyester film layer. Protective device.   2. The expandable vehicle occupant protection device according to claim 1, wherein the film layer includes a duplex film composed of an adhesive film and a surface film, and a COEX film composed of the adhesive film and the surface film. Expandable vehicle occupant protection device.   8. The expandable vehicle occupant protection device according to claim 7, wherein the gasket comprises a polyurethane adhesive film.   2. The expandable vehicle occupant protection device of claim 1, wherein the woven panel is folded to define the first and second side panels. apparatus.   The expandable vehicle occupant protection device according to claim 1, wherein the protection device expands away from the vehicle roof to a position between the vehicle side structure and the vehicle occupant. An expandable vehicle occupant protection device comprising a curtain. In an expandable vehicle occupant protection device,
First and second panels of woven material arranged so that one is above the other, said second panel being exposed of said first panel extending around the periphery of the first panel It is in a form that leaves the part,
A stitching portion extending through the first and second panels, one above the other, and interconnecting the first and second panels;
A first film layer above the first panel and covering the stitched portion;
An expandable vehicle comprising a second film layer overlying the second panel and covering the stitched portion, the second film layer covering the exposed portion of the one panel. Passenger protection device. In an expandable vehicle occupant protection device,
First and second panels of woven material arranged so that one is above the other;
A stitching portion extending through the first and second panels, one above the other, and interconnecting the first and second panels;
A first film layer above the first panel and covering the stitched portion;
A second film layer overlying the second panel and covering the stitched portion, wherein the first and second film layers extend beyond the periphery of the first and second panels. A peripheral overlap portion extending, the peripheral overlap portion being positioned such that one is above the other and stacked together to block leakage of expansion fluid from between the first and second panels An expandable vehicle occupant protection device designed to form a peripheral edge seal. In an expandable vehicle occupant protection device,
First and second panels of woven material, one above the other;
A gasket comprising a narrow strip of film disposed between the first side panel and the second side panel and extending along at least a portion of a periphery of the panel;
A stitched portion extending through the first and second panels and the gasket and interconnecting the first and second panels and the gasket;
A first film layer above the first panel and the seam;
An expandable vehicle occupant protection device comprising the second panel and a second film layer above the seam. In a method of manufacturing an expandable vehicle occupant protection device,
Providing first and second panels of woven material without any coating or laminate on either side;
Arranging the first and second panels so that one is above the other;
Sewing the first and second panels, one above the other, to each other;
Laminating the first film layer on the first panel, the first film layer being above and covering the first panel and the stitching portion;
Laminating the second film layer to the second panel, the second film layer being over and covering the second panel and the seam A method of manufacturing a vehicle occupant protection device. In a method of manufacturing an expandable vehicle occupant protection device,
Providing first and second panels of woven material arranged such that one is above the other;
Configuring the second panel to leave the exposed portion of the first panel extending around a periphery of the first panel;
Sewing the first and second panels, one above the other, to each other;
Laminating the first film layer on the first panel, the first film layer also covering the sewn portion;
Laminating the second film layer to the exposed portion of the second panel and the first panel, the second film layer also comprising covering the stitched portion. A method of manufacturing an expandable vehicle occupant protection device. In a method of manufacturing an expandable vehicle occupant protection device,
Providing first and second panels of woven material;
Placing a gasket between the first and second side panels along at least a portion of the periphery of the panel;
Sewing the first panel, the second panel and the gasket together;
A step of laminating a first film layer on the first panel above the sewn portion;
Laminating a second film layer on the second panel above the sewn portion and producing an expandable vehicle occupant protection device.   27. The method of claim 26, wherein laminating the first and second film sheets comprises laminating the gasket to the first and second panels simultaneously. In a method of manufacturing an expandable vehicle occupant protection device,
Providing first and second panels of woven material arranged such that one is above the other;
Sewing the first and second panels, one above the other, to each other;
Providing a first and second film layer that is larger than the first and second panels;
Laminating the first film layer on the first panel and above the sewn portion;
Laminating the second film layer on the second panel and above the sewn portion;
Laminating overlapping portions of the perimeter that extend beyond the perimeter of the first and second panels and one of the first and second film layers is over the other to form a perimeter edge seal; A method of manufacturing an expandable vehicle occupant protection device.

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