[54] GASTIGHT WOVEN FABRIC SHEET FOR AIR BAGS AND A PROCESS FOR PRODUCING SAME
[75] Inventors: Kunio Nishimura, Ibaraki; Hideo Nakagawa, Takatsuki; Nobuo Takahashi, Ikoma; Kiyoshi Maruo, Matsuyama, all of Japan
[73] Assignee: Teijin Limited, Osaka, Japan
[21] Appl. No.: 66,093
[22] Filed: Sep. 25,1992
[86] PCTNo.: PCT/JP92/01217
§ 371 Date: May 27, 1993
§ 102(e) Date: May 27, 1993
[87] PCTPub. No.: WO93/05985
PCT Pub. Date: Apr. 1,1993
[30] Foreign Application Priority Data
Sep. 27, 1991 [JP] Japan 3-275011
Jun. 29, 1992 [JP] Japan 4-170812
[51] Int. CU B29D 22/00
[52] U.S. Q 428/36.1; 28/116;
28/122; 28/134; 28/135; 280/728; 428/225; 428/229; 428/252; 428/265; 428/266
[58] Field of Search 428/225, 229, 265, 266,
428/252, 36.1; 28/116, 122, 134, 135; 280/728
[56] References Cited
U.S. PATENT DOCUMENTS
FOREIGN PATENT DOCUMENTS
59-192767 11/1984 Japan .
61-28046 2/1986 Japan .
61-146840 7/1986 Japan .
1-122752 5/1989 Japan .
Primary Examiner—James J. Bell
Attorney, Agent, or Firm—Burgess, Ryan & Wayne
[57] ABSTRACT
A gastight woven fabric sheet for air bags having no risk of burning a person due to formation of gas-permeable perforations and gas flowing out when the air bag is inflated, a high burst strength due to a reinforcing effect by adhesion, and a satisfactory feel, comprising a woven fabric composed of a plurality of warps and wefts each comprising a polyester multifilament having a yarn thickness of 200 to 550 deniers and a twist multiplier of 3,000 or less, and having a smooth surface formed by a calendering and a non-smoothed opposite surface thereof, the woven fabric having a gas-permeability function (ml/cm2/sec) of 7.874 p to 78.74 p (wherein p is a pressure between 0 to 0.03 kg/cm^); a radius Rl (mm) of curvature of a smoothed surface side half portion of a cross-sectional profile of a warp or weft yarn located in the smoothed surface portion of the fabric, larger than a radius R2 (mm) of curvature of an opposite side half portion of a cross-sectional profile of the above-mentioned warp or weft yarn and than a radius R3 (mm) of curvature of a non-smoothed surface side half portion of a cross-sectional profile of a warp or weft yarn located in the non-smoothed surface portion of the woven fabric, which R3 is in the range of from 0.5 to 3.5; a difference in average deviation of 0.0005 or more between surface frictional coefficients of the smoothed surface and the non-smoothed surface of the woven fabric; a difference in average deviation of 0.5 fim or more between surface roughnesses of the abovementioned surfaces; and a fiber packing of 70 to 85%.
17 Claims, 4 Drawing Sheets
