JPH05124480A - Two-layer texture for air bag provided with strap - Google Patents

Abstract

PURPOSE:To provide two-layer texture for air bag which can surely specify the distance between the upper layer texture and the lower layer texture at working of an air bag and is provided with a strap capable of being manufactured at a cheap price. CONSTITUTION:When two layers of texture 3,4 are woven while leaving a space between them, joining warp 5 for connecting both layers are respectively woven into the two layers of texture so as to elongate to the opposite layer at nearly same distance from an inflator fitting opening part 9. Woof in the vicinity of rising points 8 is made into yarn 7 which can be released from confounding with the joining warp 5 by physical external force or chemical process.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a two-layer woven fabric for an air bag. More specifically, the present invention relates to a two-layer fabric for an air bag, which has a strap between the upper fabric and the lower fabric in order to prevent the upper fabric and the lower fabric from being separated from each other by a predetermined distance or more when the airbag is inflated.

[0002]

2. Description of the Related Art Currently, an air bag system is used to protect an occupant of a vehicle. The airbag system includes a sensor for detecting an approach of an automobile to another object, an inflator that operates based on a signal from the sensor, and an airbag that contains gas generated from the inflator and inflates to protect an occupant. Since the airbag needs to be folded compactly and accommodated in the vehicle body (handle in the case of an airbag for driver seats), it is made of a flexible fabric manufactured so that a bag-shaped space is formed inside. .. For example, in the case of an air bag for a driver seat, two substantially circular cloths having a diameter of about 70 cm are joined at their peripheral edges by sewing or the like, or a bag body is formed by bag weaving, and an inflator mounting hole and, if necessary, a ventilator hole are formed in this bag body. Is provided.

When such a bag having a diameter of, for example, about 70 cm is inflated by gas at the time of operation, the bag tends to expand into a spherical shape. When the bag expands in such a spherical shape, the occupant is injured against the vehicle body (in this case, the handle). It becomes impossible to protect it safely and surely. Therefore, a strap is provided between the upper and lower woven fabrics so that the upper and lower woven fabrics are prevented from separating by a predetermined distance or more when the airbag is inflated, so that the airbag bulges in a flat shape. Is being done.

[0004]

Conventionally known straps are installed by sewing a tape-shaped woven fabric to an upper woven fabric and a lower woven fabric on the inner side of an air bag, or using a woven fabric for a strap as a third layer to form an upper woven fabric and a lower woven fabric. Weaving together with a woven fabric, and cutting out a plurality of straps from a continuous strap woven fabric from either the upper layer woven fabric or the lower layer woven fabric,
One end is sewn to the other layer of fabric. In these known methods, a sewing process is required for inserting the strap, which complicates the manufacturing process of the airbag and increases the cost, and by using the sewing, the strap can be fixed to the upper fabric or the lower fabric. It has the problem of uncertainty.

The present invention solves the problems of the conventionally known straps, and is capable of reliably defining the distance between the upper layer fabric and the lower layer fabric when the air bag is operated, and is provided with a strap that can be manufactured at low cost. It is intended to provide a two-layer woven fabric for an air bag.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is a two-layer fabric for an air bag consisting of two layers of upper and lower fabrics, wherein the two-layer fabric is spaced in at least three areas and in the two-layer fabric. At least one joining warp that connects the wefts of each fabric a plurality of times is provided, and as a weft that entangles the joining warp with the fabric in each area, it is joined by physical external force or chemical treatment. A weft capable of canceling the entanglement with the warp is used, and the rising point from each of the two layers of the joint warp when the joint warp entanglement weft is released is the inflator attachment opening of the airbag. This is achieved by a two-layer fabric for an air bag, which is arranged concentrically with the center of the opening when the portion is provided.

An air bag for a driver sheet can be manufactured by cutting the two-layer woven fabric for an air bag into a circular shape and sewing the peripheral edge thereof. Further, the two-layer woven fabric for a driver sheet can be cut into a rectangular shape to form an upper layer woven fabric and a lower layer woven fabric on two parallel sides. An air bag for a passenger seat can be formed by sewing and spreading the other two parallel sides and sewing the end face cloth. The joining warp yarns are continuously arranged from the upper layer fabric to the lower layer fabric, and extend reciprocally between the upper layer fabric and the lower layer fabric for a plurality of times with respect to the upper layer fabric and the lower layer fabric woven at a predetermined interval. Therefore, by releasing the weft yarn that entangles the joining warp with the upper layer fabric or the lower layer fabric, the interval between the upper layer fabric and the lower layer fabric can be made to be a multiple of the predetermined interval.
The treatment for releasing the entanglement of the joined warp may be performed at the time of manufacturing the air bag, but when a relatively weak yarn is used as the weft, the releasing process is not performed at the time of manufacturing the air bag, and the force at the time of expanding the air bag is not used. The weft may be cut by.

Since the above-mentioned bonded warp is continuous with the upper layer fabric or the lower layer fabric when the air bag is in operation, it is possible to sufficiently withstand the inflating force of the air bag by properly selecting the type and number of yarns of the bonded warp to be used. The space between the upper layer fabric and the lower layer fabric can be reliably maintained. Further, since the sewing process is not required for installing the strap, the air bag provided with the strap can be manufactured at low cost.

[0009]

The present invention will be described in detail below with reference to the accompanying drawings showing an example of a two-layer woven fabric for an air bag provided with the strap of the present invention. It should be noted that the following description will be made on the driver seat airbag, but it is clear that the present invention is not limited to the driver seat airbag. FIG. 1 shows a schematic cross-section of a two-layer woven fabric for an air bag equipped with a strap according to the present invention. The two-layer woven fabric 1 for an air bag shown in FIG. 1 comprises an upper woven fabric 3 and a lower woven fabric 4, each of which is composed of a warp yarn (not shown) and a weft yarn (only the weft yarn 6 at the rising point is shown). Is woven into the upper layer fabric 3 in the right side portion 3a of the upper layer fabric 3, and is entangled with the bonded warp by a physical external force or a chemical treatment on the lower layer fabric 4 side via the weft yarn 6 at the rising point at the left end of the right side portion 3a. Wefts 7 that can be released (hereinafter referred to as released wefts), and the released wefts 7 on the upper layer fabric 3 side
And reaches the weft yarn 6 at the rising point of the lower layer fabric 4,
And reaches the weft yarn 6 at the rising point on the left side and is woven into the central portion 4a of the lower layer fabric 4, and the released weft yarn 7 of the upper layer fabric 3 and the released weft yarn 7 of the lower layer fabric 4 on the left side as well as the right side portion. And reaches the weft yarn 6 at the rising point of the upper layer fabric 3, and is further woven into the left side portion 3b of the upper layer fabric 3. Therefore, the joining warp yarns 5 are securely fixed to the upper layer fabric 3 and the lower layer fabric 4.

FIG. 2 shows the two-layer fabric 2 for an air bag in which the weft yarn 7 to be released is released by a physical external force or a chemical treatment. In FIG. 1, since the joining warp yarn 5 reciprocates once and a half between the upper layer fabric 3 and the lower layer fabric 4,
In the state of the above, the joint warp yarn 5 is formed between the upper layer fabric 3 and the lower layer fabric 4.
Extends directly from the weft yarn 6 at the rising point of the upper layer fabric 3 to the weft yarn 6 at the rising point of the lower layer fabric 4, so that the spacing between the upper layer fabric 3 and the lower layer fabric 4 is the same as in the original weave fabric (FIG. 1). It is about 3 times the interval.

FIG. 3 shows a plan view of a corresponding portion of the two-layer fabric for an air bag shown in FIG. In FIG. 3, 9 indicates an inflator mounting opening, and a circle 10 shown by a broken line indicates a virtual circle concentric with the center of the inflator mounting opening. The rising points 8 defined by the weft yarn 6 of the upper layer fabric 3 of the joining warp yarn 5 or the weft yarn 6 of the lower layer fabric 4 are arranged at four positions on the virtual circle 10, and as a result, four joining warp yarns 5 are provided between the two layers. It will be extended. Therefore, when the air bag is inflated by the gas discharged from the inflator attached to the inflator attachment opening 9, the four joining warps 5 uniformly regulate the distance between the upper layer fabric 3 and the lower layer fabric 4.

FIG. 4 shows an example of an inflated air bag made from the two-layer fabric for an air bag according to the present invention. In this airbag, upper layer fabric 3 and lower layer fabric 4
The inflation is restricted by the joining warp 5 which is joined to the peripheral edge of the by sewing and is arranged in the vicinity of the inflator attachment opening 9. As a result, the cross section when inflated can be kept in an elliptical shape, and the occupant at the time of inflation can be restrained. You can ensure protection.

The fabric for an air bag is usually woven using a high-strength synthetic fiber filament system, for example, a yarn of nylon 66 840d as a warp and a weft. As the bonding warp yarns 5, yarns of the same kind as the warp yarns constituting the upper layer fabric and the lower layer fabric may be used, and a plurality of them may be aligned or twisted so as to sufficiently endure the distance between the two layers. Circle center circle 10
A plurality of joint warp threads 5 so that the rising points 8 are arranged on the upper side.
May be used. Further, as the joining warp yarn 5, a yarn having higher strength than the yarn type forming the air bag fabric, for example, an aramid fiber yarn may be used.

As the weft yarn 7 to be released, a thin yarn or a yarn made of weak fibers (for example, viscose rayon yarn) may be used when releasing is performed by a physical external force. In the case of releasing by chemical treatment, for example, water-soluble polyvinyl alcohol thread or the like can be used.

In the example shown in FIG. 1, the joining warp yarn 5 reciprocates 1.5 times between the upper layer fabric 3 and the lower layer fabric 4. This number of reciprocations may be arbitrarily selected based on the corresponding interval of the initial two-layer fabric and the interval regulated when the airbag is inflated. Further, in the example shown in FIG. 3, the number of rising points 8 is four, but the number may be any number as long as it is three or more and can be arbitrarily selected. The larger the number of rising points 8 is, the more uniformly the space between the two layers can be regulated.
If the number is too large, weaving becomes complicated, which is not preferable.

The double-layered fabric for an air bag according to the present invention uses a normal multi-layered fabric loom, and the joining warp moves from the upper layer fabric to the lower layer fabric at a predetermined position by using a dobby device or the like, or vice versa. By weaving the released weft and weaving the released weft.

[0017]

In the two-layer fabric for an air bag of the present invention, the joint warp yarns are arranged in a state of being entangled with the weft to be released, so that an arbitrary interval can be formed between the two-layer fabrics. The straps, which can define the desired spacing, can be provided in the weaving operation only. Therefore, the sewing work for installing the strap is not required, and as a result, the strap can be reliably fixed to the upper layer fabric and the lower layer fabric, and an airbag provided with the strap can be manufactured at low cost by using this fabric.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a two-layer woven fabric for an air bag equipped with the strap of the present invention.

FIG. 2 is a cross-sectional view showing a state in which the released weft of the two-layer fabric for an air bag shown in FIG. 1 is released and the upper-layer fabric is separated from the lower-layer fabric.

FIG. 3 is a plan view of the two-layer fabric for an air bag shown in FIG.

FIG. 4 is a cross-sectional view showing an example of an air bag made from a two-layer woven fabric for an air bag according to the present invention.

[Explanation of symbols]

 1, 2 ... Two-layer woven fabric for air bag 3 ... Upper woven fabric 4 ... Lower woven fabric 5 ... Joined warp 6 ... Weft at rising point 7 ... Weft to be released 8 ... Rising point 9 ... Inflator mounting opening 10 ... Virtual circle 11 ... Air bag

Claims (1)

[Claims] 1. A two-layer fabric for an air bag, which comprises upper and lower two-layer fabrics, wherein at least three areas of the two-layer fabric are spaced so that the two-layer fabrics are spaced apart. Is provided at least one joint warp that is connected a plurality of times. As a weft that entangles the joint warp with the fabric in each area, the entanglement with the joint warp can be released by a physical external force or a chemical treatment. A weft that can be used is used, and when the joining warp entanglement weft is released, the rising points of the joining warp from each of the two-layer fabrics are provided when the inflator mounting opening of the airbag is provided. A two-layer fabric for airbags, which is arranged concentrically with the center of the.