Uncoated woven fabric for air bags, and its production process and system
AssigneeToyo Boseki Kabushiki Kaisha
InventorsTatsuo Konishi, Mamoru Kitamura
Life of this patent
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Abstract
An uncoated woven fabric for air bags of motor vehicles which is produced by weaving a fabric; subjecting the woven fabric to a shrinkage step in boiling water; and then subjecting the woven fabric thus treated to a step for drying and finishing.
Claims15
(Amended) An uncoated woven fabric for air bags which has the following properties:
- (a) ST5% (warp direction)+ST5% (weft direction)≦1.2 g/d
- (b) AP≦0.5 cc/cm2/sec.
- (c) W≦205 g/m2
- (d) S (warp direction)+S (weft direction)≦220 mm
- (e) T≦0.30mm
- wherein ST5% represents a value obtained by dividing tensile strength at 5% elongation of the fabric by total yarn denier of the fabric toward the elongation direction (g/d);
- AP represents the degree of air-permeability (frazir method, 125 Pa pressure difference) (cc/cm2/sec.);
- W represents weight of the fabric (g/m2);
- S represents the degree of stiffness (cantilever method) (mm);
- and T represents a thickness of the fabric (mm).
A process for producing an uncoated woven fabric for an air bag which comprises the steps of:
- (a) weaving a fabric;
- (b) subjecting the woven fabric to a shrinkage step in boiling water;
- and then
- (c) subjecting the woven fabric thus treated to a step for drying with a suction drum dryer and finishing, wherein the step (c) is carried out by a multi-stage step.
A process for producing an uncoated woven fabric for an air bag which comprises the steps of:
- (a) weaving a fabric;
- (b) subjecting the woven fabric to a shrinkage step in boiling water;
- and then
- (c) subjecting the woven fabric thus treated to a step for drying with a suction drum dryer and finishing, wherein the step (c) is carried out by a two-stage step, temperature of the first stage (T1) being 70 to 170° C. and temperature of the second stage (T2) being 90 to 190° C.
A system of producing an uncoated woven fabric for air bags which comprises:
- (a) a weaving mechanism;
- (b) a woven fabric shrinking mechanism in boiling water;
- and
- (c) a drying and finishing mechanism, wherein the mechanism (c) includes a suction drum dryer and is a multi-stage mechanism.
A system of producing an uncoated woven fabric for air bags which comprises:
- (a) a weaving mechanism;
- (b) a woven fabric shrinking mechanism in boiling water;
- and
- (c) a drying and finishing mechanism, wherein the mechanism (c) includes a suction drum dryer and is a two-stage mechanism.
Dependencies are inferred from the claim text.