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Hollow Weave Fabric for an Air Bag and Method of Producing the Same

a technology of weave fabric and air bag, which is applied in the directions of weaving, pedestrian/occupant safety arrangement, vehicular safety arrangement, etc., can solve the problems of air bag weight increase, air bag has no internal pressure retaining function, and long and large air bag, etc., to achieve excellent internal pressure retention and light weight

Inactive Publication Date: 2008-02-21
ASAHI KASEI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] As a result of extensive investigations, the present inventors have found that the above problems can be solved by specifying the total size of a warp yarn and that of a weft yarn forming the base fabric in a hollow weave fabric for an air bag in which the periphery of the double-layer hollow weave portion is formed with a seam zone, and employing a coating composition showing a high logarithmic decrement. According to the present invention, a curtain-like air bag excellent in internal pressure retention before and after aging in comparison with conventional ones, and being made light weight can be obtained.
[0102] There is no specific restriction on means for producing a woven fabric used for the hollow weave fabric for an air bag of the invention. The weaving machine should be an air-jet loom, a rapier loom, a projectile loom, a multi-phase weaving machine, or the like. A jacquard apparatus, a DOBBI apparatus, or the like apparatus can be used as a machine for controlling the up and down of a warp yarn. However, an electronic jacquard apparatus is advantageous in productivity, quickness in design alteration and preciseness of a design. Although there is no specific restriction on the number of feeders of a jacquard apparatus, an electronic jacquard apparatus having as many feeders as from 2,000 to 14,000 feeders is preferred, because such an apparatus can precisely correspond to designing a complicated shape.

Problems solved by technology

Moreover, for the curtain-like air bag, an expandable bag-like portion is formed at each of the plurality of sites, and the air bag is long and large and has a complicated shape.
However, the air bag has actually not displayed the internal pressure retaining function under severe environmental test conditions such as heat aging, wet heat aging and cooling-heating cycle aging.
When the coating film thickness is increased in order to enhance the internal pressure retention performance, the air bag weight is undesirably increased.
Moreover, the air bag cannot pass a severe environment test.
As a result, the air bag has the following problems: the air bag has poor storability; and sewing the air bag takes a lot of time.
The air bag does therefore not sufficiently satisfy the requirement of light weight.
However, the high elongation silicone has poor adhesion to the woven fabric and the following problems result: the internal pressure retention after aging deteriorates after wet heat aging and cooling-heating cycle aging; and delamination of the silicone film sometimes takes place.
However, in conventional air bags, the adhesive strength of the first coating layer significantly lowers in the cooling region during cooling-heating cycle aging, and the air bag cannot withstand the initial pressure during expansion and deployment; as a result, the air bag cannot maintain the internal pressure retaining function.
However, there is no disclosure in the above patent specification regarding internal pressure retention during air bag deployment after aging.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Hollow Weave Fabric for an Air Bag and Method of Producing the Same
  • Hollow Weave Fabric for an Air Bag and Method of Producing the Same
  • Hollow Weave Fabric for an Air Bag and Method of Producing the Same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0200] A nylon 66 fiber having a total size of 235 dtex and a single filament size of 3.3 dtex was used as a warp yarn and a weft yarn, and a gray fabric having a design as shown in FIG. 1 was prepared with an electronic jacquard apparatus and a rapier loom. The gray fabric was then scoured and set. The seam zone formed a reversible figured weave when seen from the bag portion side. A double-layer hollow weave portion was then prepared from two yarns. Moreover, a 2 / 2 basket weave pattern was formed as a single-layer portion out of 6 yarns.

[0201] Next, the fabric was coated with a liquid silicone composition in an amount of 50 g / m2 on one side using a roll-on-knife coater, and heat treated at 180° C. for 1 minute in a drying machine. The fabric was similarly coated with a liquid silicone composition in an amount of 50 g / m2 on the other side, and heat treated at 180° C. for 1 minute in a drying machine. The bag portion after coating had a warp yarn density of 72 ends / 2.54 cm and a we...

example 2

[0207] The fabric obtained in the same manner as in Example 1 was coated with a liquid silicone composition in an amount of 50 g / m2 on one side using a roll-on-knife coater, and heat treated at 180° C. for 1 minute in a drying machine. The fabric was similarly coated with a liquid silicone composition in an amount of 50 g / m2 on the other side, and heat treated at 180° C. for 1 minute in a drying machine. The bag portion after coating had a warp yarn density of 72 ends / 2.54 cm and a weft yarn density of 72 picks / 2.54 cm.

[0208] An air bag was prepared from the hollow weave fabric for an air bag thus obtained. The properties of the air bag were as shown in Table 1. The air bag was excellent in compactness, and showed good internal pressure retention, and quick deployment speed.

[0209] The liquid silicone composition used herein was produced as explained below.

[0210] (1) Hexamethyldisilazane-treated silica in an amount of 11 parts by weight and 33 parts by weight of a vinyl-terminated...

example 3

[0222] A nylon 66 fiber having a total size of 175 dtex and a single filament size of 3.1 dtex was used as a warp yarn and a weft yarn, and a gray fabric having a design as shown in FIG. 1 was prepared with an electronic jacquard apparatus and a rapier loom. The gray fabric was then subjected to a set-coat step to give a double-layer hollow weave textured fabric having a warp yarn density of 166 ends / 2.54 cm and a weft yarn density of 166 / 2.54 cm. The seam zone formed a reversible figured weave when seen from the bag portion side. A double-layer hollow weave portion was then prepared from two yarns. Moreover, a 2 / 2 basket weave pattern was formed as a single-layer portion out of 8 yarns.

[0223] Next, the fabric was coated with a liquid silicone composition in an amount of 35 g / m2 on one side using a roll-on-knife coater, and heat treated at 180° C. for 1 minute in a drying machine. The fabric was similarly coated with a liquid silicone composition in an amount of 35 g / m2 on the othe...

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Abstract

A hollow weave fabric for an air bag in which the periphery of a double-layer hollow weave portion is formed with a seam zone, wherein the warp yarn and the weft yarn forming the base fabric are each a poly(hexamethylene adipamide) fiber having a total size of 150 to 500 dtex, the double-layer hollow weave portion has a fabric weight of 120 to 350 g / m2 on one side, and the fabric shows a logarithmic decrement of 0.01 to 0.10.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a base fabric used for an air bag that is one of the safety devices of vehicles such as automobiles. In particular, the present invention relates to a hollow weave fabric for an air bag for protecting an occupant of a vehicle during collision, and a method of producing the same. BACKGROUND ART [0002] Improvement of the safety of occupants in vehicles such as automobiles has been required in recent years, and the installation ratio of air bags has been improved. An air bag is a module wherein a sensor detects the impact a vehicle encounters during a head-on collision, a rear-end collision or a side collision of the vehicle, a gas is then blown into an expandable bag portion from an inflator to rapidly deploy and expand the air bag, and the cushioning of the air bag protects the occupant. [0003] Conventional air bags are often installed in the front portion of a driver's seat and an assistant driver's seat, respectively, a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B60R21/16D03D1/02D06M15/643B60R21/232
CPCB60R21/235B60R2021/23509B60R2021/23547B60R21/16D06M15/643D06N3/0002D06N3/128D03D1/02
Inventor NAGAOKA, TOSHIRO
Owner ASAHI KASEI CHEM CORP
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