Method of preparing polyester fabric for airbag
A method of preparing a polyester fabric for an airbag is provided, and particularly, a method of preparing a fabric for an airbag by inserting a predetermined weave into a selvage to provide the whole fabric with uniform tension upon weaving a high-density fabric for an airbag using a polyester yarn is provided.
1. A method of preparing a polyester fabric for an airbag, comprising weaving a raw fabric for an airbag using a polyester fiber to obtain a woven fabric,
wherein the weaving comprises inserting a higher-density weave region in warp or weft direction into a selvage of the raw fabric for an airbag, wherein the higher-density weave region has a larger number of yarns and a higher tension than other part of the raw fabric, and is separately inserted into the selvage of the raw fabric,
wherein the selvage is removed from the woven fabric by cutting in a cutting process to acquire an airbag cushion,
wherein each of warpwise weaving density and weftwise weaving density of the polyester fabric is 36 to 65 yarns/inch, and
wherein the higher-density weave region is a 2×2 basket weave, a 3×3 basket weave, or a mixed weave of one or more thereof, and comprises 20 yarns to 100 yarns.
2. The method according to claim 1 , wherein the polyester fiber has a total fineness of 200 to 1000 denier.
3. The method according to claim 1 , wherein the raw fabric for an airbag is weaved by an one piece woven method.
4. The method according to claim 1 , further comprising coating the woven fabric with a rubber component.
5. The method according to claim 4 , wherein the rubber component is one or more selected from the group consisting of a powder-type silicone, a liquid-type silicone, polyurethane, chloroprene, a neoprene rubber, polyvinyl chloride, and an emulsion-type silicone resin.
6. (The method according to claim 4 , wherein a coating weight of the rubber component is 30 to 150 g/m 2 .
7. The method according to claim 6 , wherein a coating weight deviation of the rubber component per unit area of m 2 is within 20% in the width direction of the fabric.
8. The method according to claim 1 , wherein the higher-density weave region is composed of 40 yarns to 90 yarns/inch.
9. The method according to claim 1 , wherein the polyester fabric has a cover factor of 1780 or more according to the following Equation 1:
Cover Factor (CF)=warp density×√{square root over ((warp denier))}+weft density×√{square root over ((weft denier))} [Equation 1].