JP2001277973A - Hollow weave air bag foundation cloth and hollow weave air bag - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide high-quality hollow weave air bag foundation cloth excellent in housing performance and folding-up performance of an air bag and a hollow weave air bag using thereof. SOLUTION: This hollow wave air bag base cloth has a bag part A formed by joining a fabric web by a hollow weave, and has a double part C noninflatable at air bag actuating time in an outer peripheral part and/or an inner peripheral part of a connecting joining single weave (a single part) D formed so as to surround the bag part (a double part) A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag-woven airbag base fabric and a bag-woven airbag used for an airbag, which is one of safety parts for automobiles, and more particularly, to a front protection or a side protection for a passenger in a transportation vehicle. And a bag-woven airbag using the same.

[0002]

2. Description of the Related Art In recent years, as one of safety parts for automobiles,
The mounting rate of airbags is rapidly increasing as occupants' safety awareness increases. Airbags are used to generate high-temperature, high-pressure gas from the inflator when a sensor detects an impact in the event of an automobile collision, and this gas is used to rapidly deploy the airbag to help protect occupants. It is.

[0003] Conventionally, airbags that protect the occupant in the event of a collision from the front of the driver's seat or front passenger seat have been installed. Recently, airbags that can cope with a collision from the side have been developed.

[0004] Airbags for the driver's seat and the passenger's seat are conventionally manufactured by sewing two airbag base fabrics. However, recently, due to demands for improving the performance of airbags and reducing manufacturing costs, attention has been paid to bag-weaving techniques that can form bags at the weaving stage.

[0005] In addition, side protection airbags are often designed for rollover of automobiles,
Unlike airbags for passenger seats, it is said that it is necessary to secure an internal pressure holding time of several seconds to 10 seconds after deployment. It is designed to protect the occupant's head even when the vehicle rolls over. Gas leakage from the woven fabric body must be prevented due to the necessity of securing the internal pressure holding time after deployment, but it is not practical for sewn products due to air leakage from the seam. Then, it is the present condition to coat the surface of the woven airbag base fabric.

[0006] Recently, as vehicles become lighter and more compact, the storage space for airbags is becoming smaller. Therefore, lightweight of the airbag base fabric itself,
It is required that the airbag base fabric be well folded and stored as well as compact.

[0007] In the case of a bag-woven airbag for a driver's seat and a passenger's seat, since an internal pressure is not required to be maintained for several seconds to about 10 seconds, a non-coated cloth is usually used for the purpose of light weight and compactness, and low air permeability. High density fabrics are required. In addition, all airbags for the driver's seat, the passenger's seat, and the side protection have large leakage of air from the misalignment between the single and double parts when the airbags are deployed, and a large amount of residue from the inflator. It is a problem, and a high-density fabric is needed to solve this problem.

[0008]

However, in the case of a bag-woven airbag base fabric in which all the warp yarns have one doubled portion, the following problems are encountered.
Since the number of warp yarns per unit area is about twice as large as that of the double part and the hardness of the base fabric is increased, it is difficult to fold the airbag when storing the airbag, and the foldability decreases. ,
There is a problem that the storage property is deteriorated. In particular, in the case of a high-density woven fabric, this tendency becomes remarkable.

Accordingly, the present invention solves the problems of the above-mentioned prior art bag-woven airbag base fabric, particularly the problems relating to the storage and foldability of the airbag, and provides a high-quality bag-woven airbag base fabric. It is an object of the present invention to provide a woven airbag using the same.

[0010]

Means for Solving the Problems In order to achieve the above object, the inventors of the present invention have conducted intensive studies, and as a result, have completed a bag-woven airbag base fabric of the present invention having the following features.

The characteristic structure of the bag-woven airbag base fabric according to the present invention is an airbag base fabric having a bag portion formed by joining fabrics by bag weaving, and surrounding the bag portion (double portion). At least one of the outer peripheral portion and the inner peripheral portion of the connection single-structure (single portion) formed as described above has a double portion that does not expand when the airbag is activated.

According to this configuration, the presence of the double portion that does not inflate when the airbag is activated further improves the folding workability, facilitates folding, and does not increase the volume of the folded airbag. Therefore, the airbag is excellent in the storage property when storing the airbag in the storage space, and the workability in the airbag folding step can be improved.

As a result, when storing the airbag, it is possible to reliably solve the problems of the prior art, such as difficulty in folding, lowering the foldability, and lowering the storage performance. It is possible to provide a high-quality woven airbag base fabric which is excellent in foldability.

It is preferable that the double portion which does not expand when the airbag is operated is formed in accordance with a folding pattern or a folding interval of the airbag.

According to this configuration, the foldable portion can be folded through the double portion, and the foldability is further improved, which is convenient.

Furthermore, a warp portion having no single portion in any portion in the warp direction or a weft portion having no single portion in at least one of the portions in the weft direction is provided on an outer peripheral portion of the binding single structure. Is preferred.

According to this configuration, the warp or the weft from the beam is unlikely to be loosened, so that the weaving property is stabilized and good, which is convenient.

The number of warp portions having no single portion in any portion in the warp direction or the number of warp portions having no single portion in at least one of the portions in the weft direction is equal to the number of all warps or all wefts in one pattern of the airbag. It is preferable that the number is 30% or less of at least one of the number.

According to this structure, since the warp or the weft from the beam is less likely to be loosened, the weaving property is stabilized and improved, which is convenient. For further stabilization of the weaving property, it is preferably at most 20%, more preferably at most 10%.

[0020] At least one of a part of the warp or the weft at the outer periphery of the binding single layer formed so as to surround the bag portion is adjusted in accordance with the interval at which the airbag is folded.
Preferably, at least one of the warp direction and the weft direction does not have a single portion.

According to this configuration, the operability of folding is improved, and it is easy to be folded, so that the bulk after folding of the airbag can be reduced, and the storage capacity of the airbag can be improved. It is convenient.

Further, a characteristic configuration of the woven airbag according to the present invention is that the woven airbag base fabric according to any one of claims 1 to 5 is used.

According to this configuration, it is possible to reliably solve the problems of the prior art, such as difficulty in folding, lowering the foldability, and worsening the storability, when storing the storable body. An excellent and high quality woven airbag can be provided.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The yarn constituting the base fabric of the woven airbag of the present invention is not particularly limited in its material,
Nylon 66, Nylon 6, Nylon 46, Nylon 1
2, aromatic polyamide fibers such as aramid fibers, and homopolyesters such as polyethylene terephthalate and polybutylene terephthalate. Alternatively, a wholly aromatic polyester, an ultrahigh molecular weight polyethylene fiber, a PPS fiber, a polyetherketone fiber, or the like can be used. However, in consideration of economy, polyester fiber and polyamide fiber (nylon 6
6, nylon 6, nylon 46) are preferred. Furthermore, these synthetic fibers include antioxidants, heat stabilizers, leveling agents, antistatic agents, thickeners, flame retardants, etc., in order to improve the processability in the yarn production process and post-processing process. Various additives may be contained.

The coating agent used for preventing the air permeability from lowering and misalignment is not particularly limited, and a synthetic rubber such as chloroprene, chlorosulfonated olefin, silicone, or the like, or a rubber-like material may be used. Lamination may be performed via an adhesive.

There is no particular limitation on the loom used in weaving, for example, a water jet loom,
An air jet room, a rapier room, a projector room, and the like are used. However, it is particularly preferable to use a water jet loom or an air jet loom in consideration of fiber productivity, damage to the warp yarn, yarn contamination, and the like.

A jacquard device or a dobby device is used for determining the weave pattern. In particular, a jacquard device (electronic type or mechanical type) is required to perform complicated patterning, and an electronic jacquard device is preferable in consideration of productivity and ease of pattern change.

Hereinafter, preferred examples of the bag-woven airbag base fabric of the present invention will be described in detail with reference to the drawings.

The base fabric shown in FIG. 1 has a bag woven portion (double portion), a portion A which is an outer peripheral portion of a single joining portion, and a bag woven portion (double portion) which does not expand when the airbag is activated. C), and a D portion, which is a single portion (coupling single portion) required to form the woven portion of the A portion. The outer peripheral portion, which is the portion B, may basically be woven with any structure as long as it is not a bag-woven structure (double-part preparation structure). The warp in section C is organized from 4 units or more with 4 units as a basic unit, and has a width of about 2 mm or more. Also, C
The number of warp units in the portion is 1 to 12 units, more preferably 1 to 10 units. In the drawing, a indicates the distance between the center portions of the C portion, and it is preferable to match the distance between the folded portions when storing the airbag, and b indicates the width of the D portion, and the misalignment occurs when the airbag is deployed. 10m so that no
m or more.

FIG. 4 is a schematic cross-sectional view of a dotted line portion (a cross section taken along the line IV) in FIG. For the sake of simplicity, the portions B and D in the figure are represented by plain weave structures.

FIG. 2 shows a modified example of the woven airbag base fabric shown in FIG. 1. The basic fabric configuration is the same as that shown in FIG. Is small (only part B is present in the vertical position of part A with respect to the paper surface of FIG. 2, and part C is not present).

FIG. 3 shows a plane structure of a conventional airbag base fabric of a woven fabric for comparison. This bag-woven airbag base fabric forms a bag-weaving portion, as shown in FIGS. 1 and 2, a portion A which is a bag-weaving portion (double portion), a portion B which is an outer peripheral portion of a single joining portion and a bag-weaving portion. Single part (ie, binding one part) necessary to perform
However, the woven portion of the portion C shown in FIGS. 1 and 2 does not exist.

In the case of the prior art shown in FIG. 3, the bending strength of the base cloth at the portion B is increased, the folding workability is deteriorated, and the folding work is difficult to be performed. Gets worse.

When 30% or more of the total number of warp yarns of the airbag base fabric is a warp having no single portion in any portion, most of the outer peripheral portion of the binding single portion is in any portion.
Since the warp has no overlapping portion, the warp from the beam is loosened, and the weaving property is reduced. Therefore, in the bag-woven airbag base fabric of the present invention, the ratio of the warp having no single portion in any portion is preferably 30% or less of the total number of warps,
For stable weaving, the content is more preferably 20% or less, and further preferably 10% or less.

Further, according to the folding pattern and the folding interval at the time of storing the airbag, C as shown in FIGS.
By inserting the part, the folding workability is improved, and the folding work is easily performed. Therefore, it is possible to reduce the bulk after folding the airbag, and it is possible to improve the storage capacity of the airbag.

[0036]

The present invention will be described in more detail with reference to the following examples. Evaluation in the following Examples and Comparative Examples,
Displayed by the following method.

The foldability substitute measure was evaluated in two ways. For one, the base cloth was folded as shown in FIG. 5, and a load of 400 g was placed at a position 20 mm away from the folding point indicated by X in FIG. 5, and the height L of the ring formed at that time was evaluated. The smaller the L value, the better the foldability. At the time of this measurement, the folding point is the center point in the length direction of the test cloth, and in Examples 1 and 2, and in the case of Comparative Example 2, sampling was performed so that the center point was the portion C.
In the case of Comparative Example 1, sampling was performed such that the portion B was the center point. The width of the test cloth was 5 cm, and the size of the bottom face was 5 cm in length, which is the same as the width of the test cloth, so that the load weight becomes uniform over the entire width of the test cloth.

In the other case, sampling was performed in the same manner as the test cloth used in the test described above, the base cloth was folded, a load was placed on the folding point, and the gap between the upper and lower base cloths was eliminated. It was evaluated by load. At this time, the smaller the load when the gap disappears, the better the foldability. In addition, the load used in this evaluation is the same as the test described above, and the length of the bottom surface is 5 cm, which is the same as the width of the test cloth, so that the weight of the load becomes even throughout the width of the test cloth. It was used.

As an evaluation of the bulkiness of the airbag base fabric, the base fabric is folded in a bellows shape at a warp portion (portion C in FIGS. 1 and 2) having no binding portions at regular intervals in parallel with the warp direction. Then, the height when a load of 500 g was placed thereon was evaluated. At this time, the diameter of the load was 3 cm according to the airbag folding interval. Further, in the case of a base cloth having no warp portion without a binding portion (FIG. 3), the base fabric was folded in bellows at the same method and at the same interval as described above. However, in the display, the height of Example 1 is set to 100, and other Examples and Comparative Examples are displayed. As this evaluation value is smaller, the airbag base fabric does not become bulky, and the storability of the airbag becomes better.

The weaving property was evaluated based on the number of times the loom was stopped per hour. This indicates that the smaller the number of stops, the better the weaving property.

Example 1 Nylon 6 was used for warp and weft.
6, 350 dt / 108f, and the density of the bag weave portion (double portion) was 60 / (2.54 cm) × 55 / (2.54 cm) (warp × weft), and the size of the bag weave portion Was woven into a bag-woven airbag base fabric having a configuration shown in FIG. At this time, the distance of a shown in FIG. 1 is 30 mm, the distance of b is 30 mm, and the woven portion (double portion) of the portion C is the warp 4.
The book was used as a basic unit to form a bag-weaving section organized by three of the units (that is, the C section was constituted by using 12 warps). At that time, the ratio of the C section warp to the total number of warp was 7.9%. The weaving property in this example was good, and the quality of the obtained base fabric was also good.

Example 2 A woven airbag fabric was woven under the same conditions as in Example 1 except that the fabric structure shown in FIG. 2 was used. Further, the ratio of the portion C was 2.8%.

(Comparative Example 1) A woven airbag base fabric was woven under the same conditions as in Example 1 except that the base fabric configuration shown in FIG. 3 was used.

(Comparative Example 2) The same base fabric construction as in Example 1, but the C portion is composed of 15 units (60 warp yarns), and the warp yarn having no binding portion in any part is about 40% of the total number of warp yarns. Met.

Table 1 shows the results of evaluating the characteristics of each of the above-mentioned airbag fabrics.

[0046]

[Table 1] As is clear from Table 1, in the case of Examples 1 and 2, the height at the L value, which is a foldability substitute measure, is small, and the load for eliminating the gap is small. It can be seen that the foldability is good. In addition, in the case of Example 1, since the value of the bulkiness evaluation of the airbag base fabric is also low, the woven airbag base fabric of this embodiment does not become bulky, and the airbag storage property is very good. Becomes

In the case of the second embodiment, although the evaluation of the bulkiness is inferior to that of the first embodiment, it can be said that the airbag storage property is good in terms of the folding workability and the ease of folding.

On the other hand, in the case of the comparative example 1 created by the configuration of FIG. 3, since the C portion existing in the examples 1 and 2 does not exist, the height at the L value, which is a foldability substitute measure, is reduced. Since the load is large and the load for eliminating the gap is large, it can be seen that the foldability of the base fabric of the woven airbag is poor. In addition, in the case of Comparative Example 1, since the bulkiness evaluation of the airbag base fabric also shows a high value, the woven airbag base fabric of Comparative Example 1 becomes bulky and the airbag storage property becomes poor. .

In the case of Comparative Example 2, since the C portion is provided as in the case of Examples 1 and 2, the workability of folding the airbag and the ease with which the airbag can be folded are good, and the storage property of the airbag is good. Is good, but the number of stops during weaving of the airbag base fabric is large, and the weavability is poor.

[0050]

The bag-woven airbag base fabric of the present invention has a binding single part (l) formed so as to surround a bag part (double part).
The air bag has a bag portion (corresponding to a portion C in FIGS. 1 and 2) that does not inflate when the air bag is activated at the outer peripheral portion of the air bag portion. Thereby, the folding workability is further improved, the folding work is easily performed, and the folded airbag does not become bulky. As a result, the airbag base fabric is excellent in storability when the airbag is stored in the storage space, and further improves the workability of the airbag folding step.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a woven airbag base fabric according to the present invention.

FIG. 2 is a plan view showing a modified example of the woven airbag fabric according to the present invention.

FIG. 3 is a plan view showing an example of a conventional bag-woven airbag fabric.

FIG. 4 is an enlarged cross-sectional schematic view of a broken line portion in FIG.

FIG. 5 is an explanatory diagram of an L value evaluation method.

[Explanation of symbols]

 A bag part (double part) B outer peripheral part C double part which does not inflate when airbag is activated D connecting single part

Continued on the front page (72) Inventor Mamoru Kitamura 1-1-1, Katata, Otsu-shi, Shiga F-term in Toyobo Co., Ltd. Research Laboratory 3D054 CC26 CC27 CC45 FF17 4L048 AA24 AB07 BA13 CA13 DA25

Claims (6)

[Claims] 1. An airbag base fabric having a bag portion formed by binding fabrics by bag weaving, wherein the airbag base fabric is formed with a single binding structure (single layer) formed so as to surround the bag portion (double portion). A woven airbag base fabric, characterized in that at least one of the outer peripheral portion and the inner peripheral portion of the portion has a double portion that does not expand when the airbag is activated. 2. The woven airbag base fabric according to claim 1, wherein the double portion that does not inflate when the airbag is activated is formed in accordance with a folding pattern and a folding interval of the airbag. 3. The outer periphery of the binding single layer has a warp portion having no single portion in any portion in the warp direction or a weft portion having no single portion in at least one portion in the weft direction. The airbag base fabric according to claim 1. 4. The number of warp portions having no single portion in any portion in the warp direction or the number of warp portions having no single portion in at least one of the portions in the weft direction is equal to the number of the airbag 1.
4. The woven airbag base fabric according to claim 3, wherein the number of at least one of all the warp yarns or all the weft yarns in the handle is 30% or less. 5. A warp direction or a weft direction in which at least one of a part of the warp or the weft in an outer peripheral portion of the binding single structure formed so as to surround the bag portion is aligned with an airbag folding interval. 4. The woven airbag fabric of claim 3, wherein at least one of the portions has no single portion. 6. A woven airbag using the woven airbag base fabric according to claim 1.