| 摘要 |
<p>An airtight woven sheet for air bags, not having the possibility of causing gas-permeable holes to develop in an air bag made of this sheet, when inflated, not having the possibility of causing a gas to flow out from such an air bag to burn an occupant of the vehicle, capable of being reinforced very effectively when sealed with a bonding agent, having a high bursting strength, and having an excellent hand. This woven sheet includes a fabric consisting of weft and warp threads of multifilament yarn of polyester of 200-550 denier having a twist multiplier of not more than 3000, and having a smoothed surface formed by calendering and another non-smoothed surface. This fabric shall satisfy all of the following conditions: the gas-permeability function (ml/cm<2>/sec) is in the range of 7.874p-78.74p (p is 0-0.03 kg/cm<2>G). The radius of curvature (R1) of a smoothed surface-side half portion of a cross-sectional contour line of a weft thread and/or a warp thread in the smoothed surface of the fabric is larger than a radius of curvature (R2) of the opposite side half portion thereof, and also larger than a radius of curvature (R3) of a non-smoothed surface-side half portion of a cross-sectional contour line of a weft thread and/or a warp thread in the non-smoothed surface of the fabric. R3 is in the range of 0.5-3.5. A difference in the average deviation of the friction coefficient between the non-smoothed surface and the smoothed surface is not less than 0.0005. A difference in the average deviation of the surface roughness between the non-smoothed surface and the smoothed surface is not less than 0.5 mu m, and a fiber packing rate 70-85%. <IMAGE></p> |
