Sheet material for vehicle safety air bags

• US 4,963,412 A
• Filed: 06/14/1989
• Issued: 10/16/1990
• Est. Priority Date: 06/17/1988
• Status: Expired due to Term

• Current Assignee: Takata Corporation (Ningbo Junsheng Investment Group Co., Ltd.)
• Original Assignee: Takata Corporation (Ningbo Junsheng Investment Group Co., Ltd.)
• Inventors: Kokeguchi, Akira
• Primary Examiner(s): Robinson, Ellis P.
• Assistant Examiner(s): Watkins, III, William P.
• Application Number:
  US07/365,689
• Time in Patent Office: 489 Days
• Field of Search: 428/137, 428/138, 428/139, 428/140, 428/423.7, 428/198, 280/743
• US Class Current: 428/137
• CPC Class Codes: B32B 2250/24 All layers being polymeric
• CPC Class Codes: B32B 2305/028 Hollow fillers; Syntactic material
• CPC Class Codes: B32B 2605/003 Interior finishings
• CPC Class Codes: B32B 2605/08 Cars
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 3/266 characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: B60R 2021/23523 Composite coated fabric B60R2021/23514
• CPC Class Codes: B60R 2021/23557 Molding
• CPC Class Codes: B60R 2021/2359 Welding
• CPC Class Codes: B60R 21/235 characterised by their material
• CPC Class Codes: Y10T 428/24322 Composite web or sheet
• CPC Class Codes: Y10T 428/24331 including nonapertured component
• CPC Class Codes: Y10T 428/24339 Keyed
• CPC Class Codes: Y10T 428/24347 From both sides
• CPC Class Codes: Y10T 428/24826 Spot bonds connect components
• CPC Class Codes: Y10T 428/31565 Next to polyester [polyethylene terephthalate, etc.]

Abstract

Sheet material for use in vehicle safety air bags comprises a multiplicity of perforated films of polymeric material having holes, the perforated films being superposed on each other such that the holes in adjacent films do not overlap to any great extent, and adhesive filling the holes of all of the perforated films other than the outermost ones and uniting them into a laminate.

Claims

1. Sheet material for use in vehicle safety air bags comprising a multiplicity of perforated films of polymeric material having holes, the holes in the films being free of corners and the perforated films being superposed directly on each other and aligned such that the holes in adjacent films do not entirely overlap, and adhesive filling the holes of all of the perforated films other than the outermost one and uniting them into a laminate.

2. Sheet material according to claim 1 and further comprising a non-perforated film adhered to an outermost perforated film and an adhesive filling the holes of said outermost film to unite the non-perforated film to the laminate.

3. Sheet material according to claim 1 wherein the holes in the perforated films have curved edges throughout.

4. Sheet material according to claim 1 wherein the maximum dimension of the holes in any direction is about 20 mm.

5. Sheet material according to claim 1 wherein the minimum dimension of the holes in any direction is about 5 mm.

6. Sheet material according to claim 1 wherein the total area of the holes in each perforated film does not exceed about 50% of the total area of the film.

7. Sheet material according to claim 6 wherein the total area of the holes in each perforated film is from about 25% to about 45% of the total area of the film.

8. Sheet material according to claim 1 wherein the total thickness of the sheet material does not exceed about 300 micrometers.

9. Sheet material according to claim 8 wherein the total thickness of the sheet material is in the range of from about 250 micrometers to about 300 micrometers.