JPH04352843A - Cloth for air bag - Google Patents

Abstract

PURPOSE:To obtain lightweight cloth for air bag having compact storage space and basic performances of the air bag. CONSTITUTION:Cloth for air bag, comprising cloth is made up of plain weaves or twill weaves texture composed of constituent yarn having 100-500 denier fineness consisting of fiber material having >=15g/denier strength and >=22 oxygen index value and has 1,000-2,000 cover factor(CF) shown by the product of density of weft per inch and a square root of denier and a resin or rubber layer on one or both sides thereof.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag fabric used in an airbag system for protecting the human body in the event of a collision of a passenger car.

0002

[Prior Art] Conventionally known airbag fabrics include:
For woven fabrics composed of synthetic fiber filament yarns such as nylon and polyester of 500 to 1000 deniers,
Fabrics coated with flame-retardant resin or elastomer are common.

0003

[Problems to be Solved by the Invention] In conventional airbag fabrics, the raw yarn has a strength of less than 10 g/denier, and in order to ensure strength, constituent yarns of 500 to 1000 dr are required, and the oxygen index value (hereinafter referred to as Since the LOI (sometimes simply written as LOI) is around 20, it is necessary to use flame-retardant rubber such as CR rubber or flame-retardant resin coating such as PVC with a weight of 100 g/m2 or more to ensure flame resistance. As,
Since it has a basis weight of 300g/m2 or more and is thick,
There are problems with light weight and compact storage. The present invention solves the light weight and compact storage problems of the conventional technology, and also solves other airbag performance requirements such as strength, flame resistance, air resistance, integrity (between cloth and resin layer) adhesiveness, and The purpose is to provide an airbag fabric that satisfies heat resistance, etc.

0004

[Means for Solving the Problems] The present invention has a strength of 15 g/
Denier or higher, oxygen index value (hereinafter abbreviated as LOI)
Cover factor (hereinafter abbreviated as CF) consisting of yarn of 100 to 500 denier with a diameter of 22 or more is 1000 to 2
000 plain weave or diagonal weave structure, and a rubber or resin layer with a basis weight of 10 to 90 g/m2 is arranged on at least one side of the fabric.

[0005] The present invention has a strength of 15 g as a fabric constituent thread.
/denier or more, the LOI is less than or equal to 22, and it is necessary to use yarn in the range of 100 to 500 denier. This is because if the strength is less than 15 g/denier, in order to secure the required strength (64 kg/f/cm or more) for airbag fabrics, thick threads of around 1000 denier must be used, or it is difficult to weave with a normal loom. It is necessary to use a certain ultra-high density fabric, which results in a reduction in weight and compact storage. Furthermore, if the LOI is less than 22, in order to ensure flame resistance, it is necessary to use a flame retardant rubber or resin with high adhesion, which causes problems in terms of weight reduction and compact storage. Furthermore, if the yarn is less than 100 denier, even if the high strength yarn of the present invention is used, the tear strength will be low, making it undesirable as an air bag.

[0006] Here, the synthetic fiber material that can be used in the present invention is not limited in any way as long as it satisfies the above-mentioned condition range, and includes, for example, wholly aromatic polyester (polyarylate), wholly aromatic polyamide, etc. (para-aramid) and high-strength polyvinyl alcohol fibers can be used.

The fiber used in the present invention has a cross-sectional solidity of 70
% or less and an irregularly shaped cross section, it is possible to obtain a base fabric that is lightweight, has a high cover factor, and has excellent adhesiveness to resin. Section solidity = (4F/B2π) x 100 (%) (F: cross-sectional area, B: widest width in cross-section)

[0008] The cross-sectional shape of the fibers includes rectangles, triangles, ellipses, T-shapes, cross-shapes, etc., and typical examples are shown in FIG. Such irregular cross-section fibers can be obtained by a conventionally known spinning method using a spinneret having an irregularly shaped nozzle.

Furthermore, the CF of the fabric of the present invention is calculated as the product of the warp and weft fabric density (lines/inches) x the square root of fineness (dr), and must be in the range of 1000 to 2000. . This is because if it is less than 1000, the fabric becomes extremely loose, and in order to ensure low air permeability, it is necessary to apply a large amount of coating material such as rubber, resulting in a high basis weight.
In addition, when treating fabrics such as rubber, coating with a rubber solution etc. is generally carried out, but in this case, one-sided coating is preferable to ensure flexibility, but due to looseness of the fabric,
The treatment liquid leaks to the back side of the fabric, causing problems such as hardening of the texture and deterioration of quality. On the other hand, if it exceeds 2000, it is no longer necessary from the viewpoint of ensuring low air permeability, and only the disadvantages of high basis weight will occur.

[0010] Furthermore, the weave structure of the fabric must be a plain weave or a diagonal weave. This is because this structure has excellent airtightness and is small in thickness.

On the other hand, it is necessary to provide a rubber or resin layer on one or both sides of the fabric in an amount of 10 to 90 g/m 2 . This is because in order to achieve the low air permeability required for airbags using only fabric, the fabric must be an extremely dense fabric, which limits the number of looms available for weaving, and as a result tends to increase the cost. To avoid this,
CR (chloroprene) on one or both sides of the fabric.
Rubber such as the like or resin such as PVC is used to ensure low air permeability. Here, if the adhesion amount is less than 10 g/m2, the effect of achieving low air permeability is insufficient;
This is because if it exceeds g/m2, there is no need to achieve low air permeability, and the disadvantage of unnecessarily increasing the basis weight increases. It is preferable to use rubber from the viewpoint of the shock absorbing properties of the fabric.

0012

[Function] 1 made of synthetic fiber yarn of the present invention having a strength of 15 g/denier or more and an oxygen index value (LOI) of 22 or more.
A fabric with a CF of 1000 or more and 2000 or less of a plain weave or mesh weave structure consisting of constituent yarns in the range of 00 to 500 deniers, and a rubber or resin layer of 10 or more to 90 g/m2 or less on one or both sides of the fabric. The rubber or resin-treated fabric with which airbags are coated ensures the various performances required of airbag fabrics, and is significantly lighter and more compactly storable than conventional technology, making it extremely desirable for airbags. You will get the dough.

[0013]

[Example] The constituent yarn is a 200 dr multifilament polyaryte fiber with an elliptical cross section with an LOI of 37, a strength of 25 g/dr, and a cross-sectional solidity of 48% as measured by JIS K7201, and the vertical and horizontal implant densities are varied. A plain weave fabric was prototyped using a known rapier loom. This fabric is a 20% solids solution prepared by blending 15 parts of antimony trioxide with a vulcanizing agent, etc. to 100 parts by weight of chloroprene rubber (hereinafter sometimes referred to as CR), and dissolving this in toluene. (Viscosity 25 poise: 2
0°C) was coated on one side by roll-on knife coating method. The weavability of the above fabric, the ability to remove liquid from the back side of the fabric when coated with CR/rubber liquid, and the basic performance as an air bag were measured. In addition, as a comparative example, the strength was 9 g/dr.
, 840dr multifilament nylon 66 was used, and the CR rubber/single-sided coated cloth barely maintained flame retardancy that passed the standard (10cm/min) when applied at 150g/m2, but as shown in Table 1, Total weight 350g/m
2, which is large in thickness, proving the lightweight and compact storage properties of the airbag fabric of the present invention.

[0014]

[Table 1]

[0015]

[Effects of the Invention] As explained above, the airbag fabric of the present invention is thinner and significantly lighter than those of the prior art, and also has other basic airbag performance. Therefore, it can be said to be an extremely convenient material for use as a membrane material for automobile airbags due to its light weight and compact storage characteristics.

[Brief explanation of drawings]

FIG. 1 is an example of a modified cross-sectional shape of a synthetic fiber used in the present invention.

Claims (1)

[Claims] [Claim 1] A plain weave or mesh weave fabric with a cover factor of 1000 to 2000, consisting of yarns of 100 to 500 denier with a strength of 15 g/denier or more and an oxygen index value of 22 or more, having a basis weight on at least one side. 10-9
Airbag fabric with a 0g/m2 rubber or resin layer.