JP2002225669A - Double weaving air bag for side collision - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a double weaving air bag that solves a problem of a conventional double weaving air bag foundation and, especially, a problem about unevenness in thickness and unevenness in warp tension in a width direction in view of flatness of the foundation. SOLUTION: In forming the double weaving air bag, a foundation is woven in a bagging weave which has a percentage crimp fluctuation of 40% or smaller in all the warp of the foundation, to form an air bag.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag which is one of safety devices for automobiles, and more particularly to an airbag which is particularly useful for protecting a passenger in a transportation vehicle from a side.

[0002]

2. Description of the Related Art In recent years, as one of safety components for automobiles, the mounting rate of airbags has been rapidly increasing along with an increase in occupant safety awareness. In the event of a car crash, airbags
The impact is detected by a sensor, and a high-temperature and / or high-pressure gas is generated from the inflator, and the gas rapidly deploys the airbag to help protect the occupant.

Conventionally, airbags for a driver's seat and a passenger's seat that protect an occupant in the event of a frontal collision have been installed. Recently, airbags that can cope with a collision from the side have been developed. Have been.

[0004] Conventionally, airbags for a driver's seat and a passenger's seat are conventionally used.
It is made by sewing two airbag base fabrics. However, a bag weaving technique capable of forming a bag at the weaving stage has recently attracted attention because of the improvement in performance of an airbag and a reduction in manufacturing cost.

[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 internal pressure retention time of several seconds to 10 seconds after deployment. It is designed so that the occupant's head can be protected even during a rollover of the vehicle. Therefore, gas leakage from the woven fabric body must be prevented, and it is not practical for sewn products due to air leakage from the seams. At present, it is usual to coat the surface of a woven airbag base fabric.

[0006]

The side-impact woven airbag is a bag in which a plurality of fabrics are partially joined together to form a bag. The thickness of the stitched portion and the tension of the warp that are integrally joined are different.

If the thickness or the warp tension of the base fabric constituting the side-impact woven airbag is different in the width direction, the base fabric is wrinkled or suspended during winding after weaving, and the quality of the base fabric deteriorates. . In addition, after weaving the base fabric, inspection, scouring,
Since the final product passes through drying, heat setting, and various post-processing steps, if the quality of the base fabric is deteriorated in the stage after weaving, the possibility of increasing the badness in the post-process increases.

Further, at the present stage, in the case of a woven airbag for side impact, it is often assumed that the vehicle rolls over. In order to improve the internal pressure holding performance of the bag, the woven airbag base cloth is coated with a surface. If a wrinkle is present in the base fabric, uniform coating becomes impossible, and the airbag cannot function as an airbag.

Therefore, the side-impact woven airbag of the present invention focuses on the problems of the conventional woven airbag, especially on the flatness of the airbag, and reduces the unevenness of the thickness of the base fabric constituting the airbag in the width direction. It is an object of the present invention to provide a side-impact woven airbag which solves the problem relating to warp tension unevenness.

[0010]

Means for Solving the Problems The first means of the present invention is an airbag formed by weaving with a bag weave to form a bag, and a base fabric of the airbag. A side-impact woven airbag, wherein a crimp rate variation of all warps is 40% or less,

A second aspect of the present invention is the side-impact woven airbag according to claim 1, wherein a thickness variation in a width direction of a base fabric constituting the airbag is 3% or less.

Third, the variation in the crimp rate of all the warps of the base fabric constituting the airbag is 30% or less.
A woven airbag for side impact according to the description,

Fourth, the variation in the crimp rate of all the warps of the base fabric constituting the airbag is 15% or less.
A woven airbag for side impact according to the description,

Fifth, the variation in the crimp rate of all the warps of the base fabric constituting the airbag is 10% or less.
It is a side weave airbag for side collision described.

[0015]

DETAILED DESCRIPTION OF THE INVENTION The yarn constituting the side-impact woven airbag of the present invention is not particularly limited in material, but is preferably an aliphatic polyamide such as nylon 66, nylon 6, nylon 46 or nylon 12. Fibers, aromatic polyamide fibers such as aramid fibers, and homopolyester fibers such as polyethylene terephthalate and polybutylene terephthalate are used. Other examples include wholly aromatic polyesters, ultrahigh molecular weight polyethylene fibers, PPS fibers, and polyetherketone fibers. However, polyester fibers and polyamide fibers (nylon 66, nylon 6, nylon 46) are particularly preferable in consideration of economic efficiency. In addition, there is no problem even if these synthetic fibers contain various additives in order to improve the processability in the raw yarn manufacturing process and the post-processing process. For example, antioxidants, heat stabilizers, leveling agents, antistatic agents, thickeners, flame retardants and the like.

The coating agent for preventing a decrease in air permeability and misalignment is not particularly limited, and a synthetic rubber such as chloroprene, chlorosulfonated olefin, silicone or the like is applied or a rubber-like material is used as an adhesive. It is also possible to perform lamination via an adhesive, or to perform lamination without using an adhesive. In addition, as long as the performance of the airbag is satisfied, a non-coated bag may be used without coating or laminating, and a post-processing may be performed on the non-coated base fabric.

The weaving machine used for weaving is not particularly limited. For example, a water jet room, an air jet room, a rapier room, a projector room and the like are used. However, water jet looms and air jet looms are particularly preferred in view of weaving productivity, damage to warp yarns, yarn contamination, and the like.

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

The boiling water shrinkage of the yarn used is not particularly limited, but the hot water shrinkage (SHW) of JIS-L-1013 (8.18.1A) can be used.
(Value) of about 4 to 15% is a preferable fiber when passing through the boiling water shrinking step in the subsequent step, more preferably 6 to 15%.
-10%, more preferably 8-10%.

[0020]

The present invention will be described in more detail below. In addition,
Physical properties in Examples and Comparative Examples were measured by the following methods.

Samples used in Examples and Comparative Examples were prepared in the shape shown in FIG. 1, and A portion was a bag portion (multiple fabric portions) and B portion was a binding portion. In addition, in order to eliminate factors such as the shape of the bag, the drawings are simplified without taking into account the inflator mounting port and the complicated shape of the bag. In addition, examples of weaving textures used for Part A and Part B
2 to 8 and FIG. 9 shows an example of the shape of a general side-impact woven airbag.

Measurement method of crimp rate and calculation method of fluctuation rate: JIS-L-1096 (8.
7.2) was used. Since the woven structure of part A was the same for all samples, sampling was performed using the sample of Example 1 and measured.
In addition, in order to calculate the rate of change in the crimp rate, for each sample of Examples and Comparative Examples, 10 parts per
Measure the warp crimp rate of the book, calculate the average value, and calculate the ratio of the difference between the average value of the A section (bag section) and the B section (binding section) (| (A−B) / A | × 100 =%), the fluctuation rate of the warp crimp rate of the base fabric constituting the side-impact woven airbag was calculated.

A method for measuring the thickness and a method for calculating the variation rate:
Using JIS-L-1096 (under a pressure of 240 g / cm2), measurements were made at 10 locations in the width direction of the side-impact woven airbag base fabric in the A section and the B section, respectively. In addition, the thickness variation rate is the ratio of the difference from the B portion (the binding portion) based on the A portion (the bag portion) (| (A−B) / A |
× 100 =%).

Evaluation method of wrinkles and fishing: Evaluation of wrinkling and fishing was evaluated by an appearance inspection in a greige state and an appearance inspection after processing during the production process of a base fabric constituting a side-impact woven airbag. The coat processability was evaluated based on the processability of the bag and the product removal rate when coating was performed on the contrary to the process. The overall evaluation was based on the quality of the base fabric including the weaving property and the quality of the bag as the final product.

Example 1 A warp and weft yarn of 350dtex / 108f nylon 66 filament raw yarn was used, and in an air jet loom equipped with an electronic jacquard device, it was a plain weave with a double bag portion and a warp of 60 yarns / 2.54 cm. Latitude 60 /
After weaving with a bag weave to a size of 2.54 cm, the fabric was passed through a boiling water shrinking step, followed by drying and setting steps to prepare a processed fabric. A part of FIG. 1 showing this sample is a double woven bag part, and part B is a binding part structure in which a one-point binding part is created in the bag part structure.

Example 2 A warp and weft yarn of 350dtex / 108f nylon 66 filament raw yarn was used in a double weave in a double weave section using an air jet loom and an electronic jacquard device. Book / 2.54c
After weaving in a bag weave to a thickness of m, the fabric was passed through a boiling water shrinking step, followed by drying and setting steps to prepare a processed fabric. A part of FIG. 1 showing this sample is a double woven bag part, and B part is 3 × 3.
It is a binding organization using a satin organization.

Example 3 A warp and a weft yarn of 350dtex / 108f nylon 66 filament raw yarn were used in an air jet loom and an electronic jacquard device in a plain weave in a double sack part with a warp of 60 / 2.54 cm and a weft of 60. Book / 2.54c
After weaving in a bag weave to a thickness of m, the fabric was passed through a boiling water shrinking step, followed by drying and setting steps to prepare a processed fabric. A part of FIG. 1 showing this sample is a double woven bag part, and B part is 7 × 7.
It is a binding organization using a basket.

Example 4 A warp and weft yarn of 350dtex / 108f nylon 66 filament raw yarn was used in an air jet loom and an electronic jacquard device in a plain weave in a double sack part with a warp of 60 / 2.54 cm, a weft of 60. Book / 2.54c
After weaving in a bag weave to a thickness of m, the fabric was passed through a boiling water shrinking step, followed by drying and setting steps to prepare a processed fabric. A part of FIG. 1 showing this sample is a double woven bag part, and B part is 5 × 5.
It is a binding organization using a basket.

COMPARATIVE EXAMPLE 1 A warp and a weft yarn of 350dtex / 108f nylon 66 filament raw yarn were used in an air jet loom and an electronic jacquard device in a plain weave in a double sack part with a warp of 60 / 2.54 cm and a weft of 60. Book / 2.54c
After weaving in a bag weave to a thickness of m, the fabric was passed through a boiling water shrinking step, followed by drying and setting steps to prepare a processed fabric. A part of FIG. 1 showing this sample is a double woven bag part, and part B is 2 × 2.
It is a binding organization using a basket.

COMPARATIVE EXAMPLE 2 A warp and weft yarn of 350dtex / 108f nylon 66 filament raw yarn was used in an air jet loom and an electronic jacquard apparatus in a plain weave in a double sack part with a warp of 60 / 2.54 cm, a weft of 60. Book / 2.54c
After weaving in a bag weave to a thickness of m, the fabric was passed through a boiling water shrinking step, followed by drying and setting steps to prepare a processed fabric. In FIG. 1 showing the sachet sample, part A is a double-woven bag part, and part B is a binding part structure using a 3 × 3 basket.

[0031]

【table 1】 The coat processability and overall evaluation were ◎: very good, ○: good,
Δ: Normal, ×: Poor, marked.

As is clear from Table 1, in the case of Example 1, since the rate of change in the thickness of the base fabric constituting the woven airbag for side impact is small, and the rate of change in the crimp rate of the warp is almost nonexistent, Is obtained, the number of defects at the stage of greige is reduced, and the post-processability is good. Also, since the crimp rate of the warp is almost equal to that of the bag, there is no looseness of the warp,
Very good weaving. In addition, the coatability is good, and as a result, the quality of the obtained side-impact woven airbag is high.

In the case of Example 2, since the rate of change of the crimp ratio between the warps in the portions A and B is slightly larger than that in the example 1, the weaving property is inferior. Since the rate of change in thickness is small in the width direction of the base fabric, the flatness of the base fabric is good, there are few defects such as wrinkles, and the post-processability is good. Further, since the base fabric has flatness, the coatability is good, and as a result, the quality of the obtained side-impact woven airbag is high.

In the case of Examples 3 and 4, the fluctuation rate of the crimp ratio between the warp yarns is slightly higher, and although the weaving property is inferior to that of Example 1, the level of the warp slackness extremely deteriorates the weaving property. Not enough. Further, although the rate of change in the thickness of the base fabric constituting the side-impact woven airbag in the width direction is larger than that in Example 1, the wrinkles in the weaving stage can be suppressed to some extent. Further, the coat workability is slightly inferior to Examples 1 and 2 due to the difference in thickness between the base fabrics, but not so much as to deteriorate the coat workability.

In the case of Comparative Examples 1 and 2, as can be seen from Table 1, since the rate of thickness variation in the width direction of the base fabric constituting the side-impact woven airbag is large, the base fabric is wound around the winding core after weaving. Wrinkles are generated at the time, the quality deteriorates, and during post-processing,
The ears of the base cloth flap, the workability deteriorates, and the quality further deteriorates. In addition, the rate of change in the crimp ratio between the warps is large, and the warps are loosened, and the weaving property is significantly deteriorated. In addition, since the quality of the finished processing is poor, there is a high possibility that the quality will deteriorate during the coating process, and as a result, the quality of the side-impact woven airbag obtained will also be poor.

[0036]

According to the present invention, a side-impact woven airbag is provided.
In the base fabric constituting the airbag, the rate of change in the crimp rate between the warps of the different portions of the weave structure is small,
Since the occurrence of warp loosening during weaving can be suppressed, and the weaving property is improved and the thickness fluctuation in the width direction of the base fabric is small,
The flatness of the base fabric is obtained, and defects due to wrinkles and the like are reduced. In addition, since the flatness of the base fabric is obtained, the post-processability is improved, and even when coating is required in the post-process, the coat processability is good. The quality of the bag can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view showing one example of a bag-woven airbag base fabric sample used in Examples and Comparative Examples.

FIG. 2 is a structural diagram of a double-pouch weaving part used in Examples and Comparative Examples.

FIG. 3 is an organization diagram of a binding portion used in Example 1.

FIG. 4 is an organization diagram of a binding portion used in Example 2.

FIG. 5 is an organization diagram of a binding portion used in Example 3.

FIG. 6 is an organization diagram of a binding portion used in Example 4.

FIG. 7 is an organization diagram of a binding portion used in Comparative Example 1.

FIG. 8 is an organization diagram of a binding portion used in Comparative Example 2.

FIG. 9 shows an example of a general side-impact woven airbag.

[Explanation of symbols]

 A: Double woven bag part B: Binding part

Claims (5)

[Claims] An airbag formed by weaving with a bag weave to form a bag, wherein a variation in the crimp rate of all warps of a base fabric constituting the airbag is 40% or less. Airbag. 2. A woven airbag for side impact according to claim 1, wherein the thickness variation in the width direction of the base fabric constituting the airbag is 3% or less. 3. The side-impact woven airbag according to claim 1, wherein the crimp ratio of all warps of the base fabric constituting the airbag has a variation of 30% or less. 4. The side-impact woven airbag according to claim 1, wherein the crimp ratio of all warps of the base fabric constituting the airbag has a variation of 15% or less. 5. The side-impact woven airbag according to claim 1, wherein the crimp rate of all warps of the base fabric constituting the airbag has a variation of 10% or less.