JP3475768B2 - Base fabric for airbag and airbag - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag which retains mechanical properties and has excellent flexibility.

[0002]

2. Description of the Related Art In recent years, the practical use of airbags for ensuring the safety of passengers in automobiles has been rapidly increasing. In the case of a collision accident of an automobile, an airbag receives a collision impact and a sensor is activated to generate high temperature and high pressure gas, and the gas causes the airbag to inflate instantaneously, the occupant's face at the time of collision, It is intended to protect the forehead. Conventionally, a plain woven fabric using nylon 66 or nylon 6 filament yarn of 300 to 1000 denier is used for an airbag, and chloroprene, chlorosulfonated olefin, silicone, etc. are used to improve heat resistance, flame retardancy, air barrier property, etc. It was made by applying an elastomer resin such as synthetic rubber, cutting the laminated base fabric, and sewing it into a bag.

However, the base fabric obtained by coating and laminating these elastomeric resins is not preferable because the base fabric is considerably heavy, the texture is rough and hard, and when the airbag is inflated, the face may be scratched when it comes into contact with the face. Also in terms of storage, there are problems that it is difficult to fold and that the base cloth is thick, so there is a large storage space. Further, when coating these elastomeric resins, the processing steps are very complicated, which is not a preferable method in terms of process control and processing costs.

On the other hand, in order to remedy the above-mentioned drawbacks, investigations on an airbag using a non-coated base cloth by densifying a woven fabric using one of polyamide fibers or polyester fibers such as nylon 66 and nylon 6 have been advanced. The mechanical properties, storability, and weight reduction of the airbag base fabric have been improved compared to the coated fabric, but the airbag is inflated and expanded, and is scratched when it contacts the occupant's face.
Alternatively, there is a problem that the occupant receives a repulsion due to the inflation of the airbag and is injured by colliding with a vehicle structure, and there is a strong demand for improvement in flexibility and impact absorption of the airbag base fabric. For example, Japanese Unexamined Patent Publication (Kokai) No. 4-281062 proposes a method for producing an uncoated industrial woven fabric having a dense weave, and from a polyamide filament yarn having a hot air shrinkage of 6 to 15% to impart low air permeability. It is disclosed that the resulting woven fabric is treated in a water bath within a temperature range of 60 to 140 ° C. The non-coated high-density woven fabric proposed here is lighter in weight than the coated fabric and has improved mechanical properties, but lacks flexibility and a satisfactory airbag cannot be obtained.

Further, Japanese Patent Laid-Open No. 4-2835 proposes an uncoated low-permeability woven fabric, and discloses the use of calendering to impart low-permeability. The air bag base fabric obtained by this proposal has a considerably improved low air permeability, but has a problem that it tends to burst due to a mechanical property for an air bag, that is, a slightly low tear strength. Further, an airbag using a non-coated base cloth is injured when the airbag is inflated and deployed, and is scratched when it comes into contact with the occupant's face, or when the occupant is repulsed by the airbag inflation and collides with a vehicle structure. Therefore, there is a strong demand for improvement in flexibility and shock absorption of the airbag base fabric.

Further, Japanese Patent Application Laid-Open No. 7-292542 discloses that
In order to provide a high-density and highly flexible woven fabric by proposing a high-density woven fabric and a method for producing the same, a woven fabric composed of a composite fiber of alkali-insoluble polyethylene terephthalate and alkali-soluble polyethylene terephthalate-based copolyester Although a method of treating with alkali has been disclosed, it is the current situation that satisfactory impact absorption is not obtained.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of conventional airbags, while maintaining the mechanical characteristics required as an airbag, having a low air permeability, being flexible, and having a shock resistance upon collision. It is intended to provide a small amount of base fabric for airbags and airbags.

[0008]

The present invention adopts the following means in order to solve the above problems. That is, in the airbag base fabric of the present invention, in the airbag base fabric made of a woven fabric, one of warp yarns and weft yarns constituting the woven fabric is one of which is made of a polyamide fiber yarn and the other is made of polyester. system which is characterized in that it consists of fiber yarns, one may either is a polyamide fiber yarns or polyester yarns,
The other is characterized in that it consists of aligned yarns of polyamide fiber yarns and polyester fiber yarns,
One is characterized in that at least one is composed of a polyamide fiber yarn and a polyester fiber yarn, and the polyamide fiber yarn and the polyester fiber yarn are alternately arranged. Yes, one of them is composed of a polyamide fiber yarn or a polyester fiber yarn, the other is composed of a polyamide fiber yarn and a polyester fiber yarn, and a polyamide fiber yarn and a polyester fiber yarn. and the system fiber yarns is characterized in that it is arranged alternately.

Further, the airbag of the present invention is characterized by being constructed by using such an airbag fabric.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In the first invention of the present invention,
When the base fabric is formed by using both fibers of the polyamide fiber yarn and the polyester fiber yarn in combination, the above problems can be solved all at once.

[0011] In that case, two or more different by utilizing the fiber yarn with dry heat shrinkage ratio and boiling water shrinkage and making a difference in component yarn crimp ratio of constituting the fabric, the fabric flexibility, Due to the increased compressibility, the airbag expands and expands, absorbing the impact when it contacts the occupant's face, preventing scratches, and receiving a rebound from the occupant's airbag expansion to collide with the vehicle structure. it can be prevented from being injured
Is preferred .

In the base fabric of the present invention, a polyamide fiber yarn and a polyester fiber yarn may be used in combination.
It is necessary . Such polyamide fiber yarns include nylon 6.6, nylon 6, nylon 12, nylon 4
.6, and a copolymer of nylon 6 and nylon 6.6,
Nylon copolymerized with polyalkylene glycol, dicarboxylic acid, amine or the like is used. Among them, nylon 6.6 and nylon 6 are particularly preferable. Further, as the polyester fiber yarn , homopolyester such as polyethylene terephthalate and polybutylene terephthalate, and isophthalic acid, an aliphatic dicarboxylic acid such as 5-sodium sulfoisophthalic acid or adipic acid as an acid component constituting the repeating unit of polyester. Copolymerized polyester fibers or ultrafine fibers mainly composed of the above synthetic fibers are used. Examples of ultrafine fibers include polyethylene terephthalate as an island component, polymer array fibers mainly composed of polystyrene as a sea component, polyethylene terephthalate as an island component, and polyethylene terephthalate as a sea component copolymerized with 5-sodium sulfoisophthalic acid. Examples of the polymer array fiber include With the polymer array fibers, ultrafine fibers can be obtained by a method of removing sea components with a solvent such as trichlorethylene.

The fiber yarn may contain various additives which 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 leveling agent, an antistatic agent, a plasticizer, a thickener, a pigment, a flame retardant and the like can be contained.

Further, the synthetic fiber base fabric in the present invention is required to be composed of two types of fiber yarns, that is, the above-mentioned polyamide fiber yarn and polyester fiber yarn . By using such two types of fiber yarns , the difference in dry heat shrinkage ratio, shrinkage ratio in boiling water, elongation, etc. of each fiber yarn can be utilized to provide the base cloth with low air permeability and impact absorbability. Can be given. The mixing ratio of the fiber yarn is not particularly limited, but the mixing ratio of the polyester fiber is preferably 10 to 90.
It is preferable that the content is 30 % by weight, and more preferably 30 to 70 % by weight.

On the other hand, as the structure of the base cloth, plain weave, twill weave,
Textiles such as satin weave and their modified weaves and multiaxial weaves are used. Among them, particularly excellent mechanical properties,
A plain woven fabric is preferable from the viewpoint of the thinness. It is preferable that the woven fabric has a cover factor of 1700 to 2500 from the viewpoint of non-breathability, that is, airtightness and flexibility. Here, the cover factor is the total warp fineness of D1,
The warp density is N1, the total weft fineness is D2, and the warp density is N.
If it is 2, it is represented by D1 ^1/2 × N1 + D2 ^1/2 × N2. A water jet loom, an air jet loom, and a rapier loom are preferable as the loom used in the weaving process.

Further, synthetic fiber base cloth to be used in have you in the present invention, when decomposing said textile, warp of the textile product and /
Alternatively, the weft is composed of two or more kinds of fiber yarns having different crimp rates (hereinafter simply referred to as decomposed yarn),
Further, those having a crimp ratio of 1 to 15% and a difference in crimp ratio of two or more kinds of the decomposed yarns used for warp or weft of 0.5% or more are preferably used.
It More preferably, the difference between the crimp rates of the two or more types of decomposed yarns is 1% or more. When the difference in crimp ratio between the two or more types of decomposed yarns used for warp or weft is 0.5% or more, the decomposed yarns having a large crimp ratio are raised on the surface of the woven fabric to increase the flexibility of the base fabric, Furthermore, the compressibility due to the bulkiness of the base fabric is also increased, and the impact absorption is imparted. The mixing ratio of the decomposed yarns having two or more different crimp ratios is not particularly limited, but preferably,
Among the decomposed yarns, the mixed ratio of the decomposed yarns having the highest crimp rate is 10 to 90% by weight, and more preferably 25 to 7.
It is preferably 5% by weight. In order to make a difference in the crimp rate of two or more kinds of the decomposed yarn, the dry heat shrinkage rate of the raw yarn used for forming the woven fabric is 1 to 10%, and the difference is 2% or more, or Shrinkage rate of raw yarn in boiling water is 0.5-10%
It is preferable that the difference is 2% or more. When the difference in dry heat shrinkage between the two or more types of yarns is 2% or more, the yarn having the smaller dry heat shrinkage is raised on the surface by heat-setting the fabric using the yarns. As a result, a difference of 0.5% or more is created in the crimp rate of the decomposed yarn. When the difference in shrinkage rate in boiling water of two or more kinds of yarns is 2% or more, the yarn having a smaller shrinkage rate in boiling water is treated by hot water treatment on the woven fabric using the yarns. The difference between the crimp rates of the decomposed yarns is 0.5% or more.

Any method may be used for mixing two or more kinds of the decomposed yarns, but the following method is preferable from the viewpoint of imparting impact absorption while maintaining mechanical properties. For example, there is a method in which at least one of the warp yarn and the weft yarn of the woven fabric is composed of two types of decomposed yarns having different crimp rates, and the two types of decomposed yarns are arranged in a woven structure. As another method, there is a method in which at least one of the warp and the weft of the woven fabric is composed of two types of decomposed yarns having different crimp rates, and the decomposed yarns are arranged alternately. The arrangement method is not particularly limited, but it is preferable that one of the two types of the decomposed yarns is arranged between one decomposed yarn and the other decomposed yarn.

Any method may be used for mixing the two types of fiber yarns, but the following method is preferable from the viewpoint of imparting low air permeability and impact absorption.

As one example, the base fabric is a woven fabric , and one of the warp yarn and the weft yarn is woven with a polyamide fiber yarn and the other is a polyester fiber yarn. When a pressure (0.2 kg / cm ² ) of air applied when the airbag is inflated and deployed is applied, a polyamide fiber yarn that has a large elongation that tries to expand and a small elongation that tries to stop the expansion. Since the polyester fiber yarns interact with each other moderately, the vacant portions at the intersections of the woven fabric are clogged, and the air permeability can be reduced. Polyamide fiber
In the case of a woven fabric consisting only of yarns , if the fabric is exposed to air, the fabric will stretch too much and the vacant areas at the intersections of the fabric will expand, and conversely, in the case of a fabric consisting only of polyester fiber yarns, the fabric will not stretch even if air is applied. Since the vacant part of the fabric intersection is not clogged, low air permeability cannot be achieved.

Another example is an example in which a difference in dry heat shrinkage between a polyamide fiber yarn and a polyester fiber yarn is utilized, and for example, a polyamide fiber yarn and a polyester fiber yarn are used for either warp or weft. When heat-setting a woven fabric composed of mixed fiber yarns, the polyester fiber yarns with high dry heat shrinkage shrink more than the polyamide fiber yarns with low dry heat shrinkage. In addition, the polyamide fiber yarn is raised on the fabric surface,
A woven fabric having excellent flexibility will be formed. As such a mixing method, there is a method of using a fiber yarn obtained by aligning a polyamide fiber yarn and a polyester fiber yarn for at least one of the warp yarn and the weft yarn. The method does not include a fiber yarn obtained by mixing polyamide fibers and polyester fibers . Also, the mixing ratio of polyester fiber yarn pull aligned fiber yarn is not particularly restricted, preferably 30
˜70% by weight. There is also a method of alternately arranging a polyamide fiber yarn and a polyester fiber yarn on at least one of the warp yarn and the weft yarn. The arranging method is not particularly limited, but preferably a method of arranging one fiber yarn between one to three of the polyester fiber yarn and the polyamide fiber yarn and the other fiber yarn between them. Is good.

As yet another example, polyamide fiber yarn
By utilizing the difference of conditions and boiling water shrinkage of polyester fiber yarns, hot water a fabric constructed using a mix fibers yarns of polyamide fiber yarns and polyester fiber thread in the warp or weft By treatment, the polyamide fiber filaments with high shrinkage in boiling water shrink more than the polyester fiber filaments with low shrinkage in boiling water, so the polyester fiber filaments are raised on the fabric surface and have excellent flexibility. Becomes a woven fabric. As such a mixing method, there is a method of using a fiber yarn obtained by aligning a polyamide fiber yarn and a polyester fiber yarn for at least one of the warp yarn and the weft yarn. Similarly to the above, in the method, polyamide is also used.
Fiber yarns and tabs that are a mixture of polyester fibers and polyester fibers
A single yarn made of polyamide fiber and polyester fiber
It does not include yarns in which single yarns consisting of are randomly mixed. Well
And, although mixing ratio of polyester fiber yarns pull aligned fibers yarn is not particularly restricted, it's good preferably 30 to 70 wt%. There is also a method of alternately arranging a polyamide fiber yarn and a polyester fiber yarn on at least one of the warp yarn and the weft yarn. The arranging method is not particularly limited, but preferably one of the polyamide fiber yarn and the polyester fiber yarn, one of the fiber yarns 1 to 3 is used.
A method of arranging the other fiber yarn between the books is preferable.

Further, the polyamide fiber yarn according to the present invention
There is a difference of 180 ° C. dry heat shrinkage and / or boiling water shrinkage between the filament and the polyester fiber yarn of 2% or more,
It is preferable to utilize the difference in dry heat shrinkage at 180 ° C. and / or the difference in shrinkage in boiling water. More preferably, 180 ° C
Polyamide dry heat shrinkage fiber yarn is 1-5%, polyester fiber yarns is 3 to 10% 180 ° C. dry heat shrinkage polyamide fiber yarns of polyester fiber yarns <br / It is preferable that the dry heat shrinkage rate of 180 ° C. is 2% or more in order to give the base cloth flexibility. Regarding the shrinkage ratio in boiling water, the polyamide fiber yarn has a shrinkage ratio of 3 to 10
%, The polyester fiber yarn is 0.5 to 5%, and the shrinkage rate of the polyamide fiber yarn in boiling water is preferably 2% or more higher than that of the polyester fiber yarn in boiling water.

Further, the single yarn fineness of the fiber yarns constituting the synthetic fiber base fabric of the present invention is not particularly limited, but is preferably 0.3 to 7.0 denier, and the fibers constituting the base fabric.
Although not particularly restricted even for the total fineness of Wei yarn, from the face of the mechanical properties as well as the storage of 100 to 700
It is preferably denier. It also constitutes the base fabric
The strength of the fiber yarn is not particularly limited as long as it satisfies the mechanical properties required as an airbag, but is preferably 5 g / denier or more, more preferably 7 g / denier or more.
It is preferably g / denier or higher.

Further, in the present invention, the air permeability of the above-mentioned base fabric is adjusted to 40 kg / cm ² by flowing a fluid (air) at a pressure of 0.2 kg / cm ² and flowing the air. cm ² / sec or less, preferably 30c
It is preferably c / cm ² / sec or less. The features of the base fabric for an airbag of the present invention are that the air permeability can be reduced to a range suitable for the airbag and that the impact can be absorbed when a human body of an occupant comes into contact with the airbag. That is, base cloth obtained by the present invention, in that use using two types of synthetic fiber yarns of polyamide fiber yarns and polyester fiber yarn, or the crimp ratio of different fiber yarns, By utilizing the difference in dry heat shrinkage, shrinkage in boiling water, and elongation of each fiber yarn, it is possible to provide a product having low air permeability and flexibility.

In the present invention, it is preferable to use at least the base cloth on the face contacting side of the airbag having the above-mentioned construction.

Next, the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view showing an example of an airbag made of the base cloth of the present invention. Reference numeral 1 is a face contact side base cloth, and 2 is an inflator side base cloth. Reference numeral 3 is an inflator mounting port, and 4 is a vent hole portion. FIG. 2 is a schematic view of a measuring device for measuring impact resistance. When an ultrathin rubber balloon 6 is put in an airbag 5 to inflate it, and a pendulum 7 is raised to 45 degrees and released. The return angle due to repulsion is measured.

[0028]

EXAMPLES The present invention will be described in more detail with reference to examples. The yarn types used in the examples are summarized in Table 1. Further, the air permeability of the airbag base fabric in the examples,
The following properties were used to measure the expansion and deployment characteristics, bending resistance, crimp ratio, compression and impact of the airbag on the human body, and the presence or absence of burst. Air permeability: Using a laminar flow tube type air permeability meter, the fluid (air) is adjusted to a predetermined pressure (0.2 kg / cm ² ) and allowed to flow, and the air flow rate (cc / cm ² / se) passing therethrough
c) was measured. Inflating and deploying characteristics: The inflating and deploying time of the airbag was measured using an electric ignition type inflator manufactured by Daicel Chemical. Stiffness: JIS L 1096, 6.19.1
It was determined by method A (45 ° cantilever method).

Crimping rate: JIS L 1096, 6.7.2
Calculated from method B. Compression: Linearity (LC) and compression work (W) of compression characteristics by KES-G5 handy compression tester
C) was measured. Impact on human body: As shown in FIG. 2, an ultra-thin rubber balloon was placed in the airbag, and air was introduced to the inner pressure of 0.2 kg /
The pendulum was inflated to have a size of cm ^2, and a pendulum of 500 g of lead was released from a position of 45 ° and collided with an airbag, and the angle at which the pendulum returned due to repulsion was measured.

Presence or absence of burst: Using an airbag dynamic burst tester,
The pressure inside the bag was adjusted to be 1.5 kg / cm ^2, and the presence or absence of burst of the airbag was examined.

Example 1 As a warp, a filament yarn made of nylon 6.6 fiber having a total fineness of 420 denier, 72 filaments, a strength of 9.8 g / denier, an elongation of 22% and a dry heat shrinkage of 2% at 180 ° C. was used. The total fineness is 420 denier, 144 filaments, strength 9.3 g / denier, elongation 16%, 150 ° C dry heat shrinkage 8% polyethylene terephthalate fiber filament yarn is used, and the weaving density is 54 in the water jet room. A woven fabric having a flat design of 1 / inch and 52 wefts / inch was woven. Then, the woven fabric is immersed in a hot water bath containing 85 g of sodium alkylbenzene sulfonate at 85 ° C. for 3 minutes, dried at 130 ° C. for 3 minutes, and then heat set at 180 ° C. for 1 minute to form a warp and a weft. A base fabric for airbags having a finishing density of 55 / inch was obtained. When the air permeability of the airbag base fabric was measured,
0.2kg / cm ² under a pressure 11.0cc / cm ² /
It was sec. Thereafter, two circular fabrics having a diameter of 725 mm were cut from the base fabric for airbag by a punching method, and one circular fabric had a diameter of 200 mm formed of the same fabric in the center.
3 layers of circular reinforcing cloth of 110mm in diameter,
The upper and lower threads on the 5 mm and 175 mm lines were sewn by a lock stitch with a sewing thread composed of 420D / 1 × 3 of nylon 6.6 fiber, and a hole having a diameter of 90 mm was provided to serve as an inflator attachment port. In addition, the diameter of the same cloth 7 contradictory to the position of 255 mm in the bias direction from the center
One piece of 5 mm circular reinforcing fabric is applied, diameter 50 mm, 60 m
420D / of nylon 6.6 fiber for both upper and lower threads on the line of m
Sewing was performed by lock stitching with a sewing thread composed of 1 × 3, and two vent holes having holes with a diameter of 40 mm were provided. Next, the reinforcing cloth side of the circular cloth is placed outside, and the circular cloth is overlapped with the circular cloth by shifting the warp axis by 45 degrees, and the upper and lower threads have a diameter of 1260D of nylon 6.6 fiber on the circumference of 700 mm and 710 mm. After the sewing machine sewing with the sewing thread composed of 1 was performed by double chain stitching, the bag body was turned inside out to produce an airbag for a driver's seat having a capacity of 60 L. However, vent holes were omitted from the burst test airbag.

The characteristics of the airbag thus obtained were evaluated and are shown in Table 2. As is clear from Table 2,
The airbag of Example 1 had a short inflation time because it had the low air permeability required as an airbag, and did not burst.

Example 2 Using the same two types of filament yarn as in Example 1, a woven fabric having a plain design was constructed in which the warp and weft were reversed. Then, the woven fabric is scoured, dried and heat-set in the same manner as in Example 1 so that the finishing densities of the warp and the weft are both 5
A base fabric for airbag of 5 pieces / inch was obtained. When the air permeability of the airbag base fabric was measured, it was 0.2 kg / cm ^2.
Under the pressure of 12.1 cc / cm ² / sec. After that, a 60 L capacity airbag for a driver's seat was produced in the same manner as in Example 1.

The characteristics of the airbag thus obtained were evaluated in the same manner as in Example 1 and shown in Table 2. As is clear from Table 2, the airbag of the example had a short inflation and deployment time because it had the low air permeability required for the airbag, and did not burst .

[0035]

Example 3 As a warp, a filament yarn composed of nylon 6.6 fiber having a total fineness of 420 denier, 72 filaments, a strength of 9.8 g / denier, an elongation of 22% and a dry heat shrinkage of 2% at 180 ° C. was used. Total fineness of 210 denier, 36 filaments,
Strength 9.8g / denier, elongation 22%, 180 ° C dry heat shrinkage 2% nylon 6.6 fiber filament yarn and total fineness 210 denier, 72 filaments, strength 9.3g /
Using a filament yarn prepared by aligning filament yarns of polyethylene terephthalate fiber having a denier elongation of 16% and a dry heat shrinkage rate of 180% at 180 ° C., a flat design with a rapier loom and a weaving density of 54 warps / inch wefts 52 inches / inch Was woven. Then, the woven fabric was heat set at 180 ° C. for 1 minute to obtain an air bag base fabric having a finishing density of both warp and weft of 55 yarns / in. The crimp ratio of the decomposed yarn in the weft direction of the airbag base fabric was measured to find that the nylon 6.6
The filament yarn was 6.0% and the polyethylene terephthalate filament yarn was 4.0%. After that, a 60 L capacity airbag for a driver's seat was produced in the same manner as in Example 1.

The characteristics of the thus obtained non-coated airbag were evaluated in the same manner as in Example 1 and shown in Table 2. As can be seen from Table 2, the airbag of the present invention did not burst because of the mechanical properties required for the airbag. Further, since the base cloth has flexibility and compressibility, it has a small impact on the human body.

Example 4 As a warp, a total fineness of 420 denier, 72 filaments,
Strength 9.8g / denier, elongation 22%, 180 ° C dry heat shrinkage 2% nylon 6.6 filament filament yarn and total fineness 420 denier, 144 filaments, strength 9.3g / denier, elongation 16% , A filament yarn of polyethylene terephthalate fiber having a dry heat shrinkage rate of 180% at 180 ° C. and a warp yarn in which one polyethylene terephthalate filament yarn is arranged every two yarns of the nylon 6/6 filament yarn are used. -Weft insertion was performed using a rapier loom so that one polyethylene terephthalate filament yarn was arranged every two 6-filament yarns, and a plain weave fabric having a warp and weft density of 54 yarns / inch was woven. . Then, the woven fabric was heat set at 180 ° C. for 1 minute to obtain an air bag base fabric having a finishing density of both warp and weft of 55 yarns / in. The crimp ratio of the decomposed yarn in the warp direction of the airbag base fabric was measured to find that the nylon 6.6 filament yarn was 13.0% and the polyethylene terephthalate filament yarn was 11.5%.
%Met. The crimp rate of the decomposed yarn in the weft direction was measured to find that the nylon 6.6 filament yarn was 5.5.
%, The polyethylene terephthalate filament yarn was 3.5%. Then, as in Example 1, 60 L
A capacity airbag for a driver's seat was produced.

The characteristics of the thus obtained non-coated airbag were evaluated in the same manner as in Example 1 and shown in Table 2. As can be seen from Table 2, the airbag of the present invention did not burst because of the mechanical properties required for the airbag. Further, since the base cloth has flexibility and compressibility, it has a small impact on the human body.

Example 5 As a warp, a filament yarn composed of nylon 6.6 fiber having a total fineness of 420 denier, 72 filaments, a strength of 9.8 g / denier, an elongation of 22% and a dry heat shrinkage of 2% at 180 ° C. was used. As a total fineness of 420 denier, 72 filaments, strength of 9.8 g / denier, elongation of 22%, 180 ° C. dry heat shrinkage of 2% of nylon 6.6 fiber filament yarn and total fineness of 420 denier, 144 filaments, strength of 9.
3g / denier, elongation 16%, 180 ° C dry heat shrinkage 8%
The filament yarns of polyethylene terephthalate fiber of No. 1 were alternately wefted one by one with a rapier loom to weave a plain weave fabric having a weaving density of 54 warps / inch and 53 wefts / inch. Then, the woven fabric was heat set at 180 ° C. for 1 minute to obtain an air bag base fabric having a finished density of both warp and weft of 55 yarns / inch. When the crimp ratio of the decomposed yarn in the weft direction of the airbag base fabric was measured, the nylon 6.6 filament yarn was 5.0% and the polyethylene terephthalate filament yarn was 4.0%. After that, a 60 L capacity airbag for a driver's seat was produced in the same manner as in Example 1.

The characteristics of the non-coated airbag thus obtained were evaluated in the same manner as in Example 1 and shown in Table 2. As can be seen from Table 2, the airbag of the present invention did not burst because of the mechanical properties required for the airbag. Further, since the base cloth has flexibility and compressibility, it has a small impact on the human body.

Comparative Example 1 Total fineness 420 denier, 72 filaments, strength 9.8
g / denier, 22% elongation, 2% 180 ° C. dry heat shrinkage 2% nylon filaments are used, and the weft density of both warp and weft is 54 flats / inch on a water jet loom. Was woven. After that,
These woven fabrics were heat-set in the same manner as in Example 1 to obtain a base fabric for an air bag in which the finishing densities of the warp and the weft were both 55 / inch. After that, a 60 L capacity airbag for a driver's seat was produced in the same manner as in Example 1.

The characteristics of the airbag thus obtained were evaluated in the same manner as in Example 1 and shown in Table 1 . As can be seen from Table 1, the airbag of Comparative Example 1 did not burst because it had the mechanical properties required as an airbag, but compared with Examples 1 to 5 , the flexibility of the base fabric, Since it had no compressibility, it had a great impact on the human body.

Comparative Example 2 Total fineness 420 denier, 144 filaments, strength 9.
3g / denier, elongation 16%, 180 ° C dry heat shrinkage 8%
Using a polyethylene terephthalate fiber filament yarn of 1., a plain weave fabric having both warp and weft woven densities of 53 yarns / inch was woven in a water jet room.
Then, these woven fabrics were heat set in the same manner as in Example 1 to obtain an air bag base fabric having a finished density of both warp and weft of 55 yarns / in. Then, as in Example 1, 6
A 0 L capacity driver's seat airbag was produced.

The characteristics of the airbag thus obtained were evaluated in the same manner as in Example 1 and shown in Table 2 . As can be seen from Table 2, the airbag of Comparative Example 2 did not burst because it had the mechanical properties required as an airbag, but compared to Examples 1-5 , the flexibility and compression of the base fabric Since it has no effect, it had a great impact on the human body.

[0046]

[0047]

Example 6 The warp has a total fineness of 420 denier, 72 filaments, a strength of 9.4 g / denier, an elongation of 23%, and a boiling water shrinkage of 5%.
Using filament yarn made of nylon 6/6 fiber,
Weft yarn with a total fineness of 420 denier, 72 filaments,
Nylon 6.6 fiber filament yarn with a strength of 9.4 g / denier, an elongation of 23%, and a shrinkage in boiling water of 5%, and a total fineness of 4
20 denier, 144 filaments, strength 9.1g / denier, elongation 15%, shrinkage in boiling water 1% of polyethylene terephthalate fiber filament yarns were alternately wefted one by one with a rapier loom, weaving density A woven fabric having a flat design of 54 yarns / inch and weft yarns 53 yarns / inch was woven.
The fabric is then treated with sodium alkylbenzene sulphonate 0.
After soaking in a 95 ° C hot water bath containing 5 g / l for 3 minutes,
Dry at 130 ° C for 3 minutes, then at 160 ° C for 30 seconds
Heat setting was carried out to obtain an air bag base fabric having a finishing density of both warp and weft of 55 yarns / inch. When the crimp ratio of the decomposed yarn in the weft direction of the airbag base fabric was measured, the nylon 6.6 filament yarn was 3.5% and the polyethylene terephthalate filament yarn was 4.5%. After that, a 60 L capacity airbag for a driver's seat was produced in the same manner as in Example 1.

The characteristics of the non-coated airbag thus obtained were evaluated in the same manner as in Example 1 and shown in Table 2. As can be seen from Table 2, the airbag of the present invention did not burst because of the mechanical properties required for the airbag. Further, since the base cloth has flexibility and compressibility, it has a small impact on the human body.

Comparative Example 3 Total fineness 420 denier, 72 filaments, strength 9.4
g / denier, 23% elongation, 5% shrinkage in boiling water 5% nylon filaments were used, and the warp and weft woven densities of both were 54 on a water jet loom.
A woven fabric having a flat design of books / inch was woven. Thereafter, these woven fabrics were scoured, dried and heat set in the same manner as in Example 6 to obtain an air bag base fabric having a finished density of both warp and weft of 55 yarns / inch. After that, a 60 L capacity airbag for a driver's seat was produced in the same manner as in Example 1.

The characteristics of the airbag thus obtained were evaluated in the same manner as in Example 1 and shown in Table 2 . As can be seen from Table 2, the airbag of Comparative Example 3 did not burst because it had the mechanical properties required as an airbag, but compared to Example 6 , the flexibility and compressibility of the base fabric were Since it was not present, it had a great impact on the human body.

Comparative Example 4 Total fineness 420 denier, 144 filaments, strength 9.
Using a filament yarn of polyethylene terephthalate fiber having a denier of 1 g, an elongation of 15% and a shrinkage rate in boiling water of 1%, a plain weave fabric having a warp yarn and a weft yarn density of 53 yarns / inch was woven in a water jet loom. . Thereafter, these woven fabrics were scoured, dried and heat set in the same manner as in Example 6 so that the finishing densities of the warp and the weft were both 5
A base fabric for airbag of 5 / in was obtained. After that, a 60 L capacity airbag for a driver's seat was produced in the same manner as in Example 1.

The characteristics of the airbag thus obtained were evaluated in the same manner as in Example 1 and shown in Table 2 . As can be seen from Table 2, the airbag of Comparative Example 4 did not burst because it had the mechanical properties required as an airbag, but compared to Example 6 , the flexibility and compressibility of the base fabric were Since it was not present, it had a great impact on the human body.

Example 7 As the warp, a filament yarn made of nylon 6.6 fiber having a total fineness of 315 denier, 72 filaments, a strength of 9.5 g / denier, an elongation of 23% and a dry heat shrinkage rate of 1.5% at 180 ° C. was used. The weft yarn has a total fineness of 210 denier, 72 filaments, a strength of 9.1 g / denier, an elongation of 18% and a 180 ° C. dry heat shrinkage of 7% of polyethylene terephthalate fiber filament yarn and a total fineness of 105 denier, 36 filaments, a strength of 9. 5 g / denier, 23% elongation, 180 ° C dry heat shrinkage of 1.5% Nylon 6.6 filament filaments are used, and the filament density is 62 warps / inch on a rapier loom. A woven fabric having a flat design of 61 wefts / inch was woven. Then, the fabric is heat-set at 180 ° C. for 1 minute so that the finishing densities of the warp and the weft are both 63
A book / inch base fabric for an airbag was obtained. When the crimp rate of the decomposed yarn in the weft direction of the airbag base fabric was measured,
The nylon 6.6 filament yarn was 5.5% and the polyethylene terephthalate filament yarn was 4.0%. After that, a 60 L capacity airbag for a driver's seat was produced in the same manner as in Example 1.

The characteristics of the non-coated airbag thus obtained were evaluated in the same manner as in Example 1 and shown in Table 2. As can be seen from Table 2, the airbag of the present invention did not burst because of the mechanical properties required for the airbag. Further, since the base cloth has flexibility and compressibility, it has a small impact on the human body.

Comparative Example 5 Total fineness 315 denier, 72 filaments, strength 9.5
g / denier, elongation 23%, 180 ° C dry heat shrinkage 1.5
Using a filament yarn composed of 6% nylon 6.6 fiber, a plain weave fabric having a weave density of both warp and weft of 62 yarns / inch was woven in an air jet loom. Then, these fabrics were heat set in the same manner as in Example 7 ,
A base fabric for an air bag having a finishing density of both warp and weft of 63 yarns / inch was obtained. Then, as in Example 1, 60 L
A capacity airbag for a driver's seat was produced. The properties of the airbag thus obtained were evaluated in the same manner as in Example 1 and shown in Table 2 . As can be seen from Table 2, the airbag of Comparative Example 5 did not burst because it had the mechanical properties required as an airbag, but compared to Example 7 , the flexibility and compressibility of the base fabric were Since it was not present, it had a great impact on the human body.

Example 8 As warp, total fineness 210 denier, 36 filaments,
Strength 9.3g / denier, elongation 25%, 180 ° C dry heat shrinkage 2.5% nylon 6 fiber filament yarn and total fineness 210 denier, 72 filaments, strength 9.2g /
A warp yarn in which every other filament yarn of polyethylene terephthalate fiber having a denier, an elongation of 17% and a dry heat shrinkage rate of 180 ° C. of 9% is alternately arranged, and a weft yarn is also made of the nylon 6 filament yarn and the polyethylene terephthalate filament yarn. Were weaved by a rapier loom so that every other yarn was alternately arranged, and a woven fabric having a flat design in which the weaving densities of the warp and the weft were both 71 / inch was woven. Then, the woven fabric was heat set at 180 ° C. for 1 minute to obtain an air bag base fabric having a finished density of both warp and weft of 74 yarns / inch. When the crimp rate of the decomposed yarn in the warp direction of the airbag base fabric was measured, the nylon 6.6 filament yarn was 12.0% and the polyethylene terephthalate filament yarn was 9.5%. When the crimp rate of the decomposed yarn in the weft direction was measured, it was 4.5% for the nylon 6.6 filament yarn and 3.5% for the polyethylene terephthalate filament yarn. After that, a 60 L capacity airbag for a driver's seat was produced in the same manner as in Example 1.

The characteristics of the thus obtained non-coated airbag were evaluated in the same manner as in Example 1 and shown in Table 2. As can be seen from Table 2, the airbag of the present invention did not burst because of the mechanical properties required for the airbag. Further, since the base cloth has flexibility and compressibility, it has a small impact on the human body.

Comparative Example 6 Total fineness 210 denier, 36 filaments, strength 9.3
g / denier, elongation 25%, 180 ° C dry heat shrinkage 2.5
Using a filament yarn composed of 6% nylon 6 fiber, a woven fabric having a flat design, in which the weaving densities of the warp and the weft were both 72 yarns / inch, was woven with a rapier loom. Then, these woven fabrics were heat set in the same manner as in Example 8 to obtain an airbag base fabric having a finished density of both warp and weft of 74 yarns / inch. After that, a 60 L capacity airbag for a driver's seat was produced in the same manner as in Example 1.

The characteristics of the airbag thus obtained were evaluated in the same manner as in Example 1 and shown in Table 2 . As can be seen from Table 2, the airbag of Comparative Example 6 did not burst because it had the mechanical properties required as an airbag, but compared to Example 8 , the flexibility and compressibility of the base fabric were Since it was not present, it had a great impact on the human body.

Comparative Example 7 Total fineness 210 denier, 72 filaments, strength 9.2
Using a filament yarn made of polyethylene terephthalate fiber having a g / denier, an elongation of 17% and a dry heat shrinkage rate of 180 ° C. of 9%, a plain weave fabric having warp and weft woven densities of 72 yarns / inch by a rapier loom Woven After that,
These woven fabrics were heat-set in the same manner as in Example 8 to obtain a base fabric for airbags in which the finishing densities of the warp and the weft were both 74 yarns / inch. After that, a 60 L capacity airbag for a driver's seat was produced in the same manner as in Example 1. In this way
The characteristics of the obtained airbag were evaluated in the same manner as in Example 1,
The results are shown in Table 2 . As can be seen from Table 2, the airbag of Comparative Example 7 did not burst because it had the mechanical properties required as an airbag, but compared to Example 8 ,
Due to the lack of flexibility and compressibility of the base cloth, it had a great impact on the human body.

[0062]

[Table 1]

[Table 2]

[0063]

According to the present invention, since the impact on the human body due to the inflation of the airbag can be reduced, the risk of injury due to collision with the vehicle structure due to face abrasion or repulsion due to the inflation of the airbag is small. Since the airbag is obtained, the occupant protection system using the airbag can be spread.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of an airbag of the present invention.

FIG. 2 is a schematic diagram of a measuring device for measuring impact resistance.

[Explanation of symbols]

1: Human contact side base cloth 2: Base fabric on the inflator side 3: Inflator mounting port 4: Vent hole 5: Airbag 6: Ultra-thin rubber balloon 7: pendulum

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-6-128836 (JP, A) JP-A-4-163252 (JP, A) JP-A-8-199448 (JP, A) JP-A-7- 9931 (JP, A) Actual Kaihei 6-87104 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) D03D 1/00-27/18 B60R 21/16

Claims (17)

(57) [Claims] 1. A base fabric for an airbag comprising a woven fabric,
One of the warp yarns and the weft yarns constituting the woven fabric is made of a polyamide fiber yarn, and the other is made of a polyester fiber yarn, which is a base fabric for an airbag. 2. A base fabric for an air bag, which comprises a woven fabric,
One of the warp threads and the weft threads constituting the woven fabric is made of a polyamide fiber yarn or a polyester fiber yarn, and the other is made of an aligned yarn yarn of a polyamide fiber yarn and a polyester fiber yarn. Base fabric for airbags. 3. A base fabric for an airbag, which comprises a woven fabric,
At least one of warp threads and weft threads constituting a woven fabric is composed of a polyamide fiber yarn and a polyester fiber yarn, and the polyamide fiber yarn and the polyester fiber yarn are alternately arranged. Base fabric for airbags. 4. A base fabric for an airbag, which comprises a woven fabric,
One of the warp threads and the weft threads constituting the woven fabric is made of a polyamide fiber yarn or a polyester fiber yarn, and the other is made of a polyamide fiber yarn and a polyester fiber yarn and a polyamide fiber yarn A base fabric for an air bag, characterized in that polyester fibers and polyester fibers are arranged alternately. 5. One to three fiber yarns of one of the polyamide fiber yarn and the polyester fiber yarn,
The other one fiber yarn is arranged alternately.
The base fabric for an airbag according to 3 or 4 . 6. The base fabric for the air bag, the polyester fiber yarn comprises in the range of 10 to 90 wt%, claim 1-5 airbag base fabric according to any one of. 7. the air base fabric for bag, the polyester fiber yarn comprises in the range of 30 to 70 wt%, claim 1-6 base fabric for air bag according to any one of. 8. The difference in at least one of the difference in dry heat shrinkage at 180 ° C. and the difference in shrinkage in boiling water between the polyamide fiber yarn and the polyester fiber yarn is 2% or more. claim 1-7 base fabric for an air bag according to any one of. 9. The dry heat shrinkage ratio at 180 ° C. is in the range of 1 to 5% in the polyamide fiber yarn, and in the range of 3 to 10% in the polyester fiber yarn. The base fabric for an airbag according to claim 8 . 10. The base fabric for an airbag according to claim 9 , wherein the polyester fiber yarn has a dry heat shrinkage ratio at 180 ° C. of 2% or more higher than that of the polyamide fiber yarn. 11. The shrinkage factor in boiling water is in the range of 3 to 10% for the polyamide fiber yarn and in the range of 0.5 to 5% for the polyester fiber yarn. The base fabric for an airbag according to claim 8 . 12. The base fabric for an airbag according to claim 11, wherein the polyamide fiber yarn has a shrinkage ratio in boiling water higher than that of the polyester fiber yarn by 2% or more. 13. The warp and weft have a single yarn fineness of 0.3 to
It is in the range of 7.0 denier and has a total fineness of 100.
2. A multifilament yarn having a denier of up to 700 denier and a tensile strength of 5 g / d or more.
The airbag base fabric according to any one of claims 1 to 12 . 14. A cover factor of 1,700 to 2,5.
In the range of 00, the base fabric for an air bag according to any one of claims 1 to 13. In 15. With eyes 500 g / m ² or less, the thickness Saga 1
The base fabric for an airbag according to any one of claims 1 to 14 , which has a size of not more than mm. 16. An airbag comprising the airbag base fabric according to any one of claims 1 to 15 . 17. Even without least the contact side of the human body, according to claim 1
16. An airbag constructed by using the airbag base fabric according to any one of claims 1 to 16 .