JP2003171842A - Air bag base fabric and air bag - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air bag base fabric which has excellent bag unfolding property and can efficiently absorb shock to a passenger, and an air bag. <P>SOLUTION: In the air bag base fabric comprising a synthetic fiber woven fabric, a disintegration yarn constituting the woven fabric has ≥100 dtex and ≤700 dtex total denier and ≥1.0 dtex and ≤7.0 dtex single fiber denier. The cover factor of the woven fabric is 1,500-2,300, the elongation at 50 N/cm tensile of the woven fabric is ≤15% and elongation at 300 N/cm tensile of the woven fabric is ≥15% and ≤35% to give the air bag base fabric. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag base cloth and an airbag for absorbing and protecting an occupant's impact in the event of a vehicle collision, and more particularly, to an airbag occupant having excellent bag deployability. The present invention relates to an airbag base fabric and an airbag capable of efficiently absorbing a shock.

[0002]

2. Description of the Related Art In recent years, various types of airbags have been developed in order to ensure the safety of passengers in the event of accidents in various transportation means, especially in automobiles, and their effectiveness has been recognized and rapidly put into practical use. It is progressing.

Conventionally, air bags have 300 to 1000 d.
A plain woven fabric using tex nylon 6/6 or nylon 6 filament yarn, and an elastomer resin such as synthetic rubber such as chloroprene, chlorosulfonated olefin, and silicone to improve heat resistance, flame retardancy, air barrier properties, etc. Was applied, and the laminated base fabric was cut and sewn into a bag body.

However, when coating and laminating these elastomer resins, coating methods such as knife coating, roll coating and reverse coating are generally adopted. Usually, in the case of the chloroprene elastomer resin, 90 to 120 g / m ^{2 is} applied on the surface of the base fabric, and there is a problem that the thickness becomes thick and the package volume also becomes large in terms of storability. Further, in the case of a silicone elastomer resin which is more excellent in heat resistance and cold resistance than the chloroprene elastomer resin, the coating amount is 40 to 60 g / m ² and the weight is light, but the storability and compactness are considerably improved, but it is still unsatisfactory. Is enough
There is also a problem that it is difficult to fold the bag when storing it by folding it into a package. Further, the process of applying and laminating the elastomer is complicated, and there is a problem in terms of productivity.

Therefore, in recent years, an air bag using a non-coated base cloth has attracted attention in order to solve such problems. As a corresponding technology, a high-density non-coated airbag composed of nylon 6/6, polyamide fiber woven fabric such as nylon 6 or polyester fiber woven fabric is being studied. On the other hand, with the revision of the US regulation FMVSS208 in 2000, it is required to speed up the deployment of airbags and reduce the impact on passengers. From this point of view, for example, Japanese Patent No. 2950954 discloses a non-coated base fabric using a yarn having a total fineness of 300 to 400 dtex. The airbag base fabric obtained by this proposal is considerably improved in terms of bag storability when the bag is deployed, but since there is no description about the tensile strength / elongation property of the base fabric, the airbag deployment properties are improved. Not not. Further, Japanese Patent Application Laid-Open No. 7-90746 specifies the strength at 10% elongation as a raw yarn characteristic used for an airbag base cloth. There is no description about the elongation under strength applied to the base fabric when hitting.

Therefore, from the viewpoint of the elongation under the strong force applied to the base cloth when the bag is deployed and the strength applied to the base cloth when the occupant hits the bag, the optimum base cloth has not been earnestly studied. Is.

[0007]

SUMMARY OF THE INVENTION In view of the drawbacks of the conventional airbag, an object of the present invention is to provide an airbag base cloth and an airbag which are excellent in bag deployability and can efficiently absorb the impact of an occupant. It is what

[0008]

The present invention adopts the following means in order to solve the above problems. That is, in an airbag base fabric made of a synthetic fiber woven fabric, the decomposed yarn constituting the woven fabric has a total fineness of 100 dtex or more 7
00 dtex or less, single yarn fineness of 1.0 dtex or more 7.
0 dtex or less, the cover factor of the woven fabric is 1500 to 2500, and the elongation of the woven fabric when stretched at 50 N / cm is 15% or less.
The elongation at N / cm tension is 15% or more and 35% or less.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, as a result of intensive studies on a base fabric which can be rapidly deployed and which can absorb the impact of the occupant when the bag enters the bag after the deployment, the decomposed yarns constituting the fabric are Fineness of 100 dtex or more and 700 d
tex or less, single yarn fineness of 1.0 dtex or more and 7.0 dt
ex is less than or equal to, the cover factor of the woven fabric is 1500 to 2300, the elongation of the woven fabric when stretched at 50 N / cm is 15% or less, and further 300 N / c of the woven fabric.
It has been clarified that the above-mentioned problems can be achieved by setting the elongation at m tension to be 15% or more and 35% or less.

When the correlation between the tensile strength / elongation property and the bag deployability of the synthetic fiber woven fabric according to the present invention was examined, the elongation of the woven fabric at 50 N / cm tensile was 15% or less, and further 300 N of the woven fabric. / Cm elongation is 15% or more when stretched 35
It has been confirmed that if the content is less than or equal to%, the bag can be deployed quickly and the impact on the occupant when the occupant enters the bag can be absorbed.

Regarding the above tensile strength and elongation characteristics, JIS
Based on L1096 (8.12.1A method), the fabric width is 3 cm, the tensile gripping interval is 15 cm, and the tensile speed is 200 mm.
The relationship between the elongation and the strength when pulled at a speed of / min was measured.

50 N / c of the synthetic fiber fabric of the present invention
It is important that the elongation at m tension is 15% or less when the bag is developed, and preferably 13% or less, and more preferably 10% or less. When the elongation is 15% or less, the woven fabric does not stretch when the bag is deployed, and the gas is less likely to leak from the woven fabric mesh portion, so that the gas generated from the inflator can be efficiently used and the bag Develops faster.

Further, it is important that the elongation of the above-mentioned woven fabric at the time of pulling 300 N / cm is not less than 15% and not more than 35%, because it is important for absorbing the impact when the occupant enters the bag after the bag is deployed. Is preferably 17% or more and 30% or less. When the elongation is less than 15%, when the occupant enters the bag, the woven fabric does not stretch and the impact of the occupant cannot be absorbed. On the other hand, if the elongation is greater than 35%, when the occupant enters the bag, the woven fabric will be excessively stretched, gas will leak from the woven fabric mesh portion, and the bag internal pressure cannot be maintained.
The bag cannot absorb the impact of the occupant. Further, since the gas has a high temperature, the occupant may be burned when the gas passing through the base cloth comes into contact with the face.

In order to bring the tensile strength and elongation property of the synthetic fiber woven fabric of the present invention into the range of the present invention, the elongation of the decomposed yarn constituting the woven fabric at 0.7 cN / dtex tension is 1
0% or less, and the elongation at 4cN / dtex tension is 1
It is preferably 0% or more and 20% or less. The tensile strength and elongation characteristics of the decomposed yarn are measured according to JIS L1017. 0.7 cN / dtex of the decomposed yarn
The elongation of 10% or less when stretched is 50N
/ Cm It is good to make the elongation at the time of tension 15% or less.
Further, the elongation of the decomposed yarn when pulled at 4 cN / dtex is 10
% To 20% or less is 300 N / cm of woven fabric
It is good to make the elongation at tension 15% or more and 35% or less.

In order to bring the tensile strength / elongation property of the synthetic fiber woven fabric of the present invention into the range of the present invention, not only the tensile strength / elongation property of the decomposed yarn constituting the woven fabric is specified, but also the woven structure. It is important to optimize In particular, it is preferable that the woven crimp ratio is 15% or less in the woven structure. The crimp rate is JIS L1096 (8.7.2.
It is measured based on the B method). Crimp rate is 1
Setting it to 5% or less particularly affects the elongation of the woven fabric at 50 N / cm tension, and by setting the crimp rate to 15% or less,
The elongation of the woven fabric at low tension can be suppressed, and the elongation at 50 N / cm tension can be 15% or less. In order to keep the crimp rate at 15% or less, the warp tension at the time of weaving is 50 to 2
It is preferably set to 00 cN / line. If it is less than 50 cN / piece, the crimp rate is high, and conversely 200 cN /
When it is larger than the number of books, the flexibility of the woven fabric is impaired and the weaving stability is poor, which is not preferable.

In order to bring the tensile strength and elongation property of the synthetic fiber woven fabric of the present invention into the range of the present invention, it is important to optimize the post-processing conditions after weaving. For example, when performing a scouring process after weaving, it is preferable not to shrink the woven fabric as much as possible so as not to increase the crimp rate of the woven fabric. It is better to process while applying tension. However, regarding the scouring temperature, the scouring process causes the decomposed yarns constituting the woven fabric to be heat-shrinked, and
The refining temperature is preferably 50 ° C. or higher because the elongation can be increased when N / cm is pulled. In addition, even when heat-set processing is performed, in order not to increase the crimp rate of the fabric, for example, when using a pin tenter, for the set width, keep the width of the base fabric after weaving as it is, or further width out. Is preferable, and it is preferable to control the overfeed in the range of 0 to 5% also in the length direction of the fabric. Regarding the heat setting temperature, the decomposed yarns that make up the fabric are heat-shrunk
130 ~ 2 to increase the elongation at N / cm tension
It is preferable to set it in the range of 00 ° C.

Further, the synthetic fiber woven fabric in the present invention includes nylon 6.6, nylon 6, nylon 12, nylon 4.6 and copolymer of nylon 6 and nylon 6.6, nylon 6 with polyalkylene glycol and dicarboxylic acid. Fiber such as polyamide fiber, polyethylene terephthalate, polybutylene terephthalate, etc., copolymerized with amine, amine, etc., and the acid component constituting the repeating unit of polyester, such as isophthalic acid, 5-sodium sulfoisophthalic acid or aliphatic dicarboxylic acid such as adipic acid. Polyester fiber copolymerized with aramid fiber typified by copolymerization with paraphenylene terephthalamide and aromatic ether, rayon fiber, polysulfone fiber, ultra high molecular weight polyethylene fiber, and sea island mainly composed of the above synthetic fiber Synthetic fiber fabrics are used consisting of a polymer array fibers having a granulation. Among these, polyamide fibers and polyethylene terephthalate fibers are preferable, and polyamide fibers such as nylon 6.6 and nylon 6 are preferable from the viewpoint of heat resistance, and nylon 6.6 having a high melting point is more preferable. Such fibers may contain various additives that are usually used for improving the productivity or the characteristics in the manufacturing process and the processing process of the raw yarn. For example, a heat stabilizer, an antioxidant, a light stabilizer, a smoothing agent, an antistatic agent, a plasticizer, a thickener, a pigment, a flame retardant and the like can be contained.

The total fineness of the yarns constituting the woven fabric is 100.
~ 700 dtex is important from the viewpoint of strength and bag storability, and more preferably 300-500 d.
tex. If the total fineness is less than 100 dtex, it is good in terms of bag storability, but a problem occurs in strength. On the other hand, if the total fineness is more than 700 dtex, the strength is good, but the woven fabric becomes bulky, which causes a problem in bag storage.

The single yarn fineness of the yarn constituting the woven fabric is 1.0 dt.
It is important that it is ex or more and 7.0 dtex or less from the viewpoint of yarn formability, woven fabric flexibility and low air permeability, and more preferably 2.0 dtex or more and 5.0 dtex or less. If the single yarn fineness is less than 1.0 dtex, the woven fabric is good in terms of flexibility and low air permeability, but there is a problem in terms of spinnability. On the contrary, when the single yarn fineness is larger than 7.0 dtex, the gap between the single yarns forming the yarn becomes large, the air permeability of the fabric becomes large, and the flexibility of the yarn is impaired. There is a problem in terms of.

As the raw yarn used for the woven fabric, 150
℃ dry heat shrinkage is 1% to 10%, boiling water shrinkage is 3
% Or more and 15% or less, and as tensile strength / elongation property, the elongation at 0.7 cN / dtex tension is 10% or less,
Moreover, it is preferable that the elongation at 4 cN / dtex tension is 5% or more and 20% or less.

The structure of the woven fabric is plain weave, twill weave,
Textiles such as satin weave and their modified weaves and multiaxial weaves are used. Of these, plain weaves are particularly preferable because of their excellent mechanical properties. Further, the cover factor of the woven fabric is preferably 1500 to 2300 when it is made into an airbag base fabric or an airbag, from the viewpoint of strength and bag storability. Cover factor is 150
When it is less than 0, it is preferable in terms of bag storage, but there is a problem in strength. A cover factor of more than 2300 is preferable in terms of strength, but since the woven fabric becomes hard, the flexibility deteriorates, causing a problem in bag storage. Here, the cover factor is the total fineness of the warp yarn of the base cloth, which is D ₁
(Dtex) , Warp density N ₁ (thread / 2.54 cm)
And the total weft fineness is D ₂ (dtex) , The weft density is N ₂ (thread / 2.54 cm) Then (D ₁ × 0.9 )
^{_{1/2 × N 1 + (D 2}} × 0.9 ) It is represented by ^1/2 x N ₂ .

As the loom used in the weaving process, a water jet loom, an air jet loom, a rapier loom or the like is used.

The airbag base fabric of the present invention can be used as a non-coated base fabric, but if further low air permeability is required or if it is necessary to prevent the fabric from fraying, a silicone resin or urethane resin is used. Resin processing may be performed by using, for example.

Further, the airbag base fabric of the present invention can be used for various airbags such as driver's seat, passenger's seat, rear seat, side seats, inflatable curtains and the like.

The features of the air bag base fabric and the air bag of the present invention are that they have excellent bag deployability and can efficiently absorb the impact of an occupant.

[0026]

EXAMPLES The present invention will be described in more detail with reference to examples.

Various evaluations in the examples were carried out according to the following methods. Tensile strength and elongation of woven fabric: JIS
Based on L1096 (8.12.1A method), the fabric width is 3
cm, Tension grip distance 15 cm, Tension speed 200 mm /
The relationship between elongation and tenacity when pulled at min was measured, and the average in the warp direction and the weft direction was taken. Tensile strength and elongation of raw yarn and decomposed yarn: Measured according to JIS L1017. Regarding the decomposed yarn, the average of the warp yarn and the weft yarn was taken. Crimp rate: JIS L1096 (8.7.2B)
Method).

Example 1 Nylon 6.6 (N66) having the yarn characteristics shown in Table 1
Using a raw yarn, the warp tension was set to 150 cN / thread in a water jet room, and the warp and weft were adjusted to have a weaving density of 54 threads / 2.54 cm to obtain a plain weave fabric. . Then, the fabric is tensioned in the lengthwise direction of the fabric in a warm water bath at 80 ° C. containing 0.5 g / l of sodium alkylbenzene sulfonate and 0.5 g / l of soda ash for 1
After soaking for 3 minutes, it was dried at 130 ° C. for 3 minutes, and with a pin tenter type heat treatment machine, while maintaining the same width as the width of the dried fabric, the overfeed rate was set to 2%, and 1
Heat setting was performed at 80 ° C. for 30 seconds to obtain an airbag base fabric.

The characteristics of the airbag base fabric thus obtained are shown in Table 1. The airbag base fabric of the present invention is capable of deploying the bag at high speed and absorbing the impact when the occupant enters the bag after deploying the bag.

[0030]

[Table 1]

Comparative Example 1 Using N66 raw yarn having the raw yarn characteristics shown in Table 1, the warp yarn tension was set to 40 cN / thread in a water jet loom, and the weaving density of both warp and weft was 54 yarn / 2.54
The woven fabric was adjusted to have a flat structure and was obtained. Then, the fabric is treated with 0.5 g of sodium alkylbenzene sulfonate /
1 and 0.5 g / l of soda ash were immersed in a 90 ° C. hot water bath for 3 minutes without applying tension in the length direction of the fabric, and then 1
It is dried at 30 ° C for 3 minutes, and the pin width is set to be 5% narrower than the width of the dried fabric with a pin tenter type heat treatment machine, and the overfeed rate is set to 7%.
And heat set for 30 seconds to obtain an airbag base fabric.

The properties of the thus obtained air bag base fabric are shown in Table 1. As can be seen from the above, the airbag base fabric of Comparative Example 1 did not deploy the bag at high speed, and could not absorb the impact when the occupant entered the bag after deploying the bag.

Example 2 N66 raw yarn having the raw yarn characteristics shown in Table 1 was used, the warp tension was set to 130 cN / thread in an air jet loom, and the warp and weft woven densities were both 49 / 2.54c
The woven fabric was adjusted to have a m, and a woven fabric having a flat structure was obtained. Then, using a pin tenter type heat treatment machine, the woven fabric was kept at the same width as the woven fabric after the weaving, and the overfeed rate was 0.
%, And heat set at 160 ° C. for 30 seconds to obtain an airbag base fabric.

The characteristics of the thus obtained airbag base fabric are shown in Table 1. The airbag base fabric of the present invention is capable of deploying the bag at high speed and absorbing the impact when the occupant enters the bag after deploying the bag.

Comparative Example 2 Using N66 raw yarn having the raw yarn characteristics shown in Table 1, the warp yarn tension was set to 35 cN / thread in the air jet loom, and the weaving density of both the warp yarn and the weft yarn was 49 yarn / 2.54 cm
Was adjusted so that a plain weave fabric was obtained. Then, using a pin tenter type heat treatment machine, the pin width was set to be 4% narrower than the width of the woven fabric after the weaving, and the overfeed rate was set to 6%. A bag base cloth was obtained.

The characteristics of the thus obtained airbag base fabric are shown in Table 1. As can be seen from the results, the airbag base fabric of Comparative Example 2 did not deploy the bag at high speed and could not absorb the impact when the occupant entered the bag after deploying the bag.

Example 3 N66 raw yarn having the raw yarn characteristics shown in Table 1 was used, the warp yarn tension was set to 160 cN / thread in a rapier room, and the warp and weft woven densities were both 75/2. It was adjusted to be 54 cm to obtain a woven fabric having a flat structure. Then, the fabric is immersed in a warm water bath of 80 ° C. containing 0.5 g / l of sodium alkylbenzene sulfonate and 0.5 g / l of soda ash for 3 minutes while tension is applied in the length direction of the fabric, and then at 130 ° C. for 3 minutes. After drying, using a pin tenter type heat treatment machine, set the pin width to 1% wider than the width of the dried fabric and set the overfeed rate to 0%, and heat set at 180 ° C. for 30 seconds. Got a cloth.

The properties of the thus obtained airbag base fabric are shown in Table 1. The airbag base fabric of the present invention is capable of deploying the bag at high speed and absorbing the impact when the occupant enters the bag after deploying the bag.

Comparative Example 3 N66 raw yarn having the raw yarn characteristics shown in Table 1 was used, the warp tension was set to 210 cN / thread in the rapier room, and the warp and weft woven densities were both 75/2. It was adjusted to be 54 cm to obtain a woven fabric having a flat structure. Then, using a pin tenter type heat treatment machine, the pin width was set to the same width as the width of the woven fabric after the weaving, the overfeed rate was set to 0%, and heat setting was performed at 180 ° C. for 30 seconds. The base cloth was obtained.

The properties of the air bag base fabric thus obtained are shown in Table 1. As can be seen from the above, the airbag base fabric of Comparative Example 1 deploys the bag at high speed,
After the bag was deployed, the occupant could not absorb the impact when entering the bag.

[0041]

According to the present invention, it is possible to provide an airbag base cloth and an airbag capable of absorbing the bag deployability and the impact of the occupant, and to promote the occupant protection system using the airbag.

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Claims (4)

[Claims] 1. An airbag base fabric made of synthetic fiber woven fabric, wherein the decomposed yarn constituting the woven fabric has a total fineness of 100 dte.
x or more and 700 dtex or less, single yarn fineness of 1.0 dtex
It is not less than 7.0 dtex, and the cover factor of the woven fabric is 1500 to 2300, and 50 N of the woven fabric.
An elongation of 15% or less when stretched / cm, and an elongation of 15% or more and 35% or less of the woven fabric when stretched at 300 N / cm. 2. The decomposed yarn constituting the woven fabric is 0.7 cN
/ Dtex Tensile elongation is less than 10%, and 4c
The airbag base cloth according to claim 1, wherein the elongation at N / dtex tension is 10% or more and 20% or less. 3. The airbag base fabric according to claim 1, wherein the crimp rate of the woven fabric is 15% or less. 4. An airbag comprising the airbag base fabric according to any one of claims 1 to 3.