JPH10168700A - Ground fabric for air bag, air bag and their production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a ground fabric for an air bag having excellent mechanical properties, light weight and low air-permeability while keeping flame retardancy and producible at a low cost, an air bag and to provide their production process. SOLUTION: This ground fabric for an air bag is a woven fabric of a filament yarn having a single fiber fineness of 2-8de, total fineness of 100-600de, a filament number of 30-300, a tensile strength of >=5.5g/d, a breaking elongation of >=13%, a dry-heat shrinkage of 1.5-5% at 150 deg.C and a boiling water shrinkage of 3.5-10% and composed of a polyamide fiber having a relative viscosity of 2.7-4.7 and containing 2-7.5 (×10<-5> mol/g) of amino-terminal group. The fabric has an air-permeability of <=40cc/cm<2> /sec determined by measuring the flow rate of air passing through the fabric under a fluid (air) pressure difference of 0.2kg/cm<2> .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an airbag for absorbing and protecting an occupant's impact at the time of a vehicle collision, and more particularly, to an airbag which is lightweight and has excellent mechanical properties.
The present invention relates to a base fabric for an airbag having low air permeability, an airbag, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, 300 to 1000 airbags have been used.
An elastomer resin such as synthetic rubber such as chloroprene, chlorosulfonated olefin, or silicone is applied to a plain fabric using denier nylon 66 or nylon 6 filament yarn to improve heat resistance, flame retardancy, air barrier properties, etc. Then, the laminated base cloth was cut and sewn into a bag.

[0003] However, when these elastomer resins are applied and laminated on one side of a base cloth, a coating method such as knife coating, roll coating, and reverse coating is generally employed. In the case of chloroprene elastomer resin, 90 to 120
g / m ^{2 is} applied, the thickness is increased, and there is a problem in that the package volume is increased also in terms of storability. Also, compared to chloroprene elastomer resin,
In the case of a silicone elastomer resin having better heat resistance and cold resistance, the coating amount was 40 to 60 g / m ² , and although the weight was reduced, the storage property was considerably improved, but it was not sufficient yet. The steps of coating and laminating are still complicated, and there is a problem in productivity.

[0004] On the other hand, in airbag fabrics, there has been a strong demand for improved airbag fabric storage in order to reduce costs and reduce the size of module covers, and airbags using non-coated fabrics have attracted attention. It has been. As a corresponding technology, a high-density non-coated airbag composed of a polyamide fiber fabric such as nylon 66 or nylon 6 and a polyester fiber fabric has been studied. For example, Japanese Unexamined Patent Publication No. Hei 4-2835 proposes a low-permeability woven fabric that is not coated,
There is no specific disclosure about the yarn, especially the polymer. In addition, polyester is described as a preferable material, and the use of calendering to impart low air permeability is disclosed. The airbag fabric obtained by this proposal is
Although the low air permeability is considerably improved, the mechanical properties of the airbag, that is, the tear strength is slightly lower, and the elongation is lower than that of polyamide, so it is difficult to say that it is enough to reduce the impact at the time of face contact. In fact, no satisfactory airbag base fabric has been obtained. In addition, the manufacturing process is complicated, the manufacturing cost is increased, and there is a problem in productivity.

[0005]

SUMMARY OF THE INVENTION In view of the drawbacks of the conventional airbags, the present invention is an inexpensive airbag having excellent mechanical properties while maintaining flame retardancy, light weight and low air permeability. It is an object of the present invention to provide a base fabric for a bag, an airbag, and a method of manufacturing the same.

[0006]

The present invention employs the following means in order to solve the above problems. That is, the airbag fabric of the present invention has a relative viscosity of 2.7 to 2.7.
At 4.7, the amino terminal group is 2 to 7.5 (× 10 ⁻⁵ mol
/ G) The polyamide fiber contained has a single yarn fineness of 2 to 8
In denier, the total fineness is 100 to 600 denier, the number of filaments is 30 to 300, and the tensile strength is 5.5 g /
d or more, elongation at break is 13% or more, dry heat shrinkage at 150 ° C. is 1.5 to 5%, and shrinkage in boiling water is 3.5 to 10%.
And the air permeability of the woven fabric is 0.2 kg / cm ^{2 of} fluid (air).
The flow rate is adjusted to a pressure of 40 cc / cm ² / sec or less when the flow rate of the air passing therethrough is measured.

[0007] The airbag of the present invention is characterized in that it is constructed by using such a base fabric for an airbag. Further, the method of manufacturing an airbag of the present invention has a relative viscosity. 2.7-4.7, with 2 amino terminal groups
Single fiber fineness is 2 to 8 denier and the total fineness is 100% of the polyamide fiber containing 〜7.5 (× 10 ⁻⁵ mol / g).
-600 denier, 30-300 filaments, tensile strength of 5.5 g / d or more, elongation at break of 13%
As described above, a greige machine woven with a loom using a filament yarn having a 150 ° C dry heat shrinkage of 1.5 to 5% and a boiling water shrinkage of 3.5 to 10% is sewn to a bag body. It is assumed that.

[0008]

DETAILED DESCRIPTION OF THE INVENTION The present invention has been studied diligently to provide a base fabric for an airbag having excellent mechanical properties and low air permeability without coating, calendering, or heat setting. Having a relative viscosity of 2.7 to 4.7 and an amino terminal group of 2.0 to 7.5 × 1
A polyamide fiber containing 0 ^-5 mol / g is used, the single fiber fineness is 2 to 8 denier, the total fineness is 100 to 600 denier, the number of filaments is 30 to 300, and the tensile strength is 5.
5 g / d or more, elongation at break of 13% or more, 150 ° C. dry heat shrinkage of 1.5 to 5.0%, boiling water shrinkage of 3.5 to 1
High density woven fabric composed of 0% filament yarn,
It has been found that it is possible to provide an airbag that has excellent mechanical properties while maintaining flame retardancy, is lightweight, and has low air permeability.

The polyamide fibers used in the present invention are nylon 6.6, nylon 6, nylon 12, nylon 4
6, and a polyamide fiber obtained by copolymerizing nylon 6 with nylon 6.6, a copolymer of nylon with a polyalkylene glycol, a dicarboxylic acid, an amine or the like. Among these, a polyamide fiber composed of nylon 6.6 is particularly preferred. Is preferred. In addition, such a fiber may contain various additives that are usually used for improving productivity or characteristics in a production process or a processing process of a 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. In order to achieve the present invention, the drawn yarn has a relative viscosity of 2.7 to 4.7 and an amino terminal group of 2.0 to 4.7.
It is essential to contain 7.5 × 10 ⁻⁵ mol / g. If the relative viscosity is less than 2.7, a high strength yarn cannot be obtained,
Sufficient elongation characteristics cannot be obtained as a raw yarn for airbags. When the relative viscosity is 4.7 or more, the melt viscosity is high,
Stable discharge conditions cannot be obtained, and weak and fine yarns are generated. Therefore, the yarn strength and elongation are reduced, and fluff is frequently generated. The relative viscosity referred to herein is a value obtained by dissolving 2.5 g of a sample in 25 cc of concentrated sulfuric acid (98%) and measuring the same using an Ostwald viscometer at a constant temperature in a constant temperature bath (25 ° C.). .

The amino terminal group content is 2.0 × 10 ⁻⁵ m
When the amount is less than ol / g, the polymerization rate is remarkably reduced, and the polymer polymerization cost is increased. Further, since the melt viscosity is high in the spinning process, stable discharge conditions cannot be obtained, and weak yarns and fine yarns are easily generated. With the above-mentioned amino terminal group content, the polymer is generally a polymer having a high degree of polymerization and has a remarkably high tension in the drawing process, so that it is easy to cause thread breakage due to abrasion, and it is difficult to impart uniform raw yarn high elongation characteristics. In addition, in terms of operation, the fluff quality of the original yarn or woven fabric is impaired, and the yield is significantly reduced. On the other hand, at 7.5 × 10 ⁻⁵ mol / g or more, a gelation reaction is apt to occur in the melt polymerization and melt spinning processes, and the gel formed in the spinning machine is not removed by the filtration filter, and the gel formed in the discharged yarn is not removed. They are taken in as (defects) and cause yarn breakage during the drawing process, which significantly impairs the original yarn strength and elongation characteristics. Also, in the operation aspect, the fluff quality of the original yarn or the fabric is impaired, and the yield is remarkably reduced.

On the other hand, the fineness of the single yarn, the total fineness, and the number of filaments constituting the yarn in the present invention greatly affect the mechanical properties and the storability of the airbag. Denier, preferably 5-7 denier,
Total fineness is 100-600 denier, preferably 200-
450 denier, the number of filaments is 30 to 300, preferably 50 to 150. If the single-filament fineness or the total fineness is too small, the strength as an airbag is reduced. On the other hand, if it is too thick, the fabric becomes bulky and the storage property is poor. The single yarn fineness, the total fineness, and the number of filaments may be appropriately combined within the above ranges.

To achieve the present invention, the filament yarn constituting the woven fabric has a tensile strength of 5.5 g / d or more, an elongation at break of 13% or more, and a dry heat shrinkage at 150 ° C. of 1.5 to 5.
It is necessary that the shrinkage in boiling water be 0% and 3.5 to 10%. The characteristics of the filament yarn referred to here are:
It shows the characteristics of the filament yarn (decomposition yarn) constituting the woven fabric. The tensile strength is 5.5 g / d or more, preferably 6.5 g / d or more. If the tensile strength is 5.5 g / d or less, the strength properties as an airbag are inferior. When the elongation at break is 13% or less, the fabric becomes coarse and hard, and when the dry heat shrinkage at 150 ° C is 5.0% or more, and when the shrinkage in boiling water is 10% or more, the woven fabric has poor form stability and environmental resistance. That is, it is not preferable in terms of heat resistance and moisture resistance. On the other hand, when the dry heat shrinkage at 150 ° C. is 1.5% or less and the shrinkage in boiling water is 3.5% or less, yarn breakage occurs during the drawing process, and the original yarn strong elongation characteristics are impaired.
In addition, the operation also impairs the fluff quality of yarns and fabrics,
The yield decreases. On the other hand, as a woven structure composed of multifilament yarns, plain weave, twill weave, satin weave and varieties thereof, woven fabrics such as multiaxial weave are used. Among them, particularly excellent mechanical properties, Plain fabrics are preferred from the standpoint of the ground.

In order to achieve the present invention, the air permeability of the woven fabric composed of the filament yarn is adjusted so that the fluid (air) flows at a pressure of 0.2 kg / cm ² , and the flow rate of the air passing therethrough is reduced. When measured, 40 cc / cm ² / sec or less,
Preferably, it is required to be 30 cc / cm ² / sec or less. If it is more than 40 cc / cm ² / sec, the gas barrier property, which is the most necessary property of the airbag, becomes insufficient, which is not preferable. In addition, in terms of the necessary mechanical properties as an airbag and the flammability, storability, low air permeability, and the like, the woven fabric composed of the filament yarn satisfies the following requirements at the same time. Is done.

(A) Weight W (g / m ² ) W ≦ 250 (b) Thickness Th (mm) Th ≦ 0.35 (c) Weave density D (book / in) 40 ≦ D ≦ 80 (d) Tensile strength S (N / cm) S ≧ 500 (e) Elongation at break E (%) E ≧ 15 (f) Tear strength Te (N) Te ≧ 100 (g) Cover factor K 1800 ≦ K ≦ 2500 (h) Oil Y (%) Y ≦ 0.2 (i) Crimp rate C (%) Average of warp and weft C ≦ 10 Here, the cover factor is D1 (denier) for the warp total fineness and N1 (density / warp) for the warp density. Inches), the total weft fineness is D2 (denier), and the weft density is N2 (lines / inch).
Then, (D1) ^{1 /} 2.times.N1 + (D2) ^{1 /} 2.times.N2, and preferably 2000 to 2500 from the viewpoint of low air permeability. In addition, as a loom, a water jet loom,
An air jet loom and a rapier loom can be used as appropriate. In addition, the crimp ratio indicates the crimp ratio of the woven fabric decomposed yarn. That is, assuming that a predetermined yarn length constituting the woven fabric is L ₁ and a yarn length when a load of 0.1 g / denier is applied to the decomposed yarn of the woven fabric is L ₂ (L ₂ −L ₁ ). /
Represented by L _1. Preferably, the crimp rate is 10% or less on average between the warp and the weft, more preferably the ratio of the weft crimp rate / the warp crimp rate is 0.4 to 0.7, particularly preferably, the warp is 7 to 15% and the weft is 2 to 8%. The oil content is preferably 0.2% or less, more preferably 0.04% or less from the viewpoint of combustibility. The airbag base fabric using such a woven fabric can be appropriately used for a driver's seat airbag, a passenger seat airbag, a rear seat airbag, a side airbag, and the like.

In the airbag of the present invention, the bag is sewn after weaving or the scoured / dried base fabric is sewn after weaving without heat-setting which is often performed on non-coated base fabrics. good. When heat setting is performed, the yarns constituting the fabric are converged to form gaps in the fabric, which is not preferable in terms of low air permeability, and the degree of freedom in the structure of the fabric is reduced, so that the tear strength is reduced. Further, since no heat setting is performed, there is an advantage that the manufacturing process is simplified and the manufacturing cost is reduced. For scouring / drying, it is preferable to immerse in a warm water bath containing a scouring agent at 20 to 100 ° C, squeeze with a mangle, and dry at 80 to 150 ° C.

In the above airbag, it is preferable that the reinforcing cloth used for the inflator mounting opening and the vent hole portion or the member that regulates the bag deployment shape is the same as the airbag base cloth. This is advantageous and preferable from the viewpoint of. Further, when sewing the airbag, it is preferable to sew one or more such airbag base fabrics formed by punching or fusing, and sew the periphery thereof. An airbag composed of only double seams is preferred.

The features of the airbag fabric of the present invention are that it does not impair the flame retardancy, has excellent mechanical properties, and can reduce the air permeability to a range suitable for an airbag. is there. In other words, the base fabric obtained by the present invention provides a material that maintains flame retardancy, is lightweight, and has excellent mechanical properties and low air permeability without being subjected to coating and calendering and further heat setting. can do.

[0018]

Next, the present invention will be described in more detail by way of examples.

The characteristics of the airbag fabric in the examples were measured by the following methods.

Tensile strength: determined according to JIS L1096 (strip method). Elongation at break: determined by JIS L1096 (strip method).

Tear strength: Determined according to JIS L1096 (single tongue method). Dry heat shrinkage: Shrinkage after treatment at 150 ° C for 30 minutes
(%).

Boiling shrinkage: Shrinkage after treatment at 98 ° C. for 30 minutes
Air permeability: The fluid (air) was adjusted to a pressure of 0.2 kg / cm ² and flowed using a laminar flow tube air permeability meter, and the air flow rate (cc / cm ² / sec).

Flame retardancy: The burning rate (mm / min) was determined based on the FMVSS-302 method (horizontal method).

Expansion and expansion characteristics: The expansion and expansion characteristics of an electric ignition type inflator were compared with those of a silicone rubber coated product.

Example 1 Relative viscosity 3.65, amino terminal group 3.80 × 10 ^-5 mo
1 / g of drawn yarn containing nylon 6.6 fibers, a total fineness of 420 deniers, a filament yarn of 72 filaments, and a weaving density of both warp and weft of 53 / inch in a water jet loom. The plain fabric was woven and dried at 60 ° C. to obtain a base fabric for an airbag. Filament yarn (decomposition yarn) constituting this airbag base fabric
Has a tensile strength of 7.3 g / d, an elongation at break of 16.3% and 15
The dry heat shrinkage at 0 ° C. was 1.6% for the warp and 2.2% for the weft, and the shrinkage in boiling water was 5.1% for the warp and 5.7% for the weft. The air permeability of the base fabric for an air bag was 20.2cc / cm ² / sec under a pressure of 0.2 kg / cm ^2. Thereafter, two circular cloths having a diameter of 725 mm are cut from the airbag base cloth by a punching method, and three circular reinforcing cloths each having a diameter of 200 mm made of the same cloth are laminated at the center of one circular cloth. And diameter 110
The sewing machine was sewn on the circumference of mm, 145 mm, and 175 mm with a sewing thread composed of 420D / 1 × 3 of nylon 6.6 fibers for both upper and lower threads, and a hole having a diameter of 90 mm was provided to serve as an inflator mounting opening. Further, at a position of 255 mm in the bias direction from the center, a diameter of 7 made of the same fabric is used.
A single 5 mm circular reinforcing cloth is applied to the sewing machine and the upper and lower threads are sewn with a sewing thread composed of 420D / 1 × 3 of nylon 6.6 fiber on the line of 50 mm and 60 mm in diameter, and the sewing machine is sewn with a lockstitch.
Two vent holes with 0 mm holes were installed. Next, the reinforcing fabric side of the present circular fabric was turned outside, and the other circular fabric was superimposed on the other circular fabric by shifting its longitudinal axis by 45 degrees.
12mm of nylon 6.6 fiber for both 10mm circumference
After the sewing machine was sewn by double chain stitching with a sewing thread composed of 60D / 1, the bag body was turned over, and the 60 L capacity driver airbag shown in FIG. 1 was produced.

The properties of the airbag fabric and the airbag thus obtained were evaluated and the results are shown in Table 1. As is clear from Table 1, the airbags of the examples had the mechanical properties required for the airbags as well as the inflating and deploying properties.

Comparative Examples 1 and 2 Relative viscosity: 5.15, amino terminal group: 2.55 × 10 ⁻⁵ mo
Nylon 6.6 fiber consisting of a drawn yarn containing 1 / g [Comparative Example 1] and nylon 6.6 fiber consisting of a drawn yarn containing a relative viscosity of 2.80 and an amino terminal group of 8.30 × 10 ⁻⁵ mol / g Using a 6-filament [Comparative Example 2] filament yarn having a total fineness of 420 denier and a filament count of 72, weave a plain woven fabric having a warp and weft density of 53 / inch in a water jet loom and drying at 60 ° C. Let
An airbag base fabric was obtained.

The properties of the airbag fabric thus obtained were evaluated in the same manner as in Example 1, and are shown in Table 1.

As is evident from Table 1, the airbags of Comparative Examples 1 and 2 have low original yarn strength, poor weaving properties due to fluff, and are unable to obtain uniform strength and elongation characteristics in a woven fabric.
A sufficient base fabric was not obtained as a base fabric for an airbag.

COMPARATIVE EXAMPLE 3 Using a filament yarn made of the same nylon 6.6 fiber as in Example 1, a plain weave having a warp and weft density of 53 / inch was obtained in a water jet loom. Then, the woven fabric was treated with sodium alkylbenzenesulfonate 0.1%.
After being immersed in a hot water bath containing 5 g / l and 0.5 g / l of soda ash for 3 minutes at 80 ° C., dried at 130 ° C. for 3 minutes, and then heat-set at 180 ° C. for 1 minute to obtain a base fabric for an air bag. I got Next, a 60-liter airbag for a driver's seat was prepared for the airbag base fabric in the same manner as in Example 1.

The characteristics of the airbag fabric thus obtained were evaluated in the same manner as in Example 1, and are shown in Table 1. The airbag of Comparative Example 3 was inferior in light weight and low air permeability, and had problems of low tear strength.

COMPARATIVE EXAMPLE 4 Using the same filament yarn of nylon 6.6 fiber as in Example 1, a woven fabric having a flat structure in which the weaving density of both warp and weft yarns was 45 / inch was obtained in a water jet loom. Next, the woven fabric was scoured in the same manner as in Comparative Example 3,
After drying, it was heat set at 180 ° C. for 25 seconds. Thereafter, using a comma coater, the woven fabric was coated at a coating amount of 45 g /
The coating was performed with a methyl vinyl silicone rubber so as to obtain m ² , and vulcanization treatment was adjusted at 180 ° C. for 3 minutes to obtain a base fabric for an airbag. Next, a 60-liter airbag for a driver's seat was prepared for the airbag base fabric in the same manner as in Example 1.

The properties of the airbag fabric and the airbag thus obtained were evaluated in the same manner as in Example 1.
It was shown to. Although the airbag of Comparative Example 3 was excellent in low air permeability, the weight of the base fabric was large, the processing steps were complicated, and there was a problem in terms of productivity. Example 2 Relative viscosity 3.35, amino terminal group 3.12 × 10 ⁻⁵ mo
a nylon 6.6 fiber consisting of a drawn yarn containing 1 / g, a single yarn fineness of 4.4 denier, a total fineness of 315 denier,
Using a 72-filament filament yarn, the weaving density of both the warp and the weft is 6 in the water jet loom.
3 / inch plain woven fabric was woven and scoured and dried in the same manner as in Comparative Example 3 to obtain an airbag base fabric. The tensile strength of the filament yarn (decomposed yarn) constituting the base fabric for an airbag is 7.9 g / d, the elongation at break is 16.5%, and the tensile strength is 150%.
The dry heat shrinkage at ℃ was 1.7% for warp and 2.4% for weft, and the shrinkage for boiling water was 5.4% for warp and 5.9% for weft. The air permeability of the airbag fabric was 20.5cc / cm ² / sec under a pressure of 0.2 kg / cm ^2. Thereafter, one body cloth and two side cloths were melt-cut from the airbag base cloth to produce a 120 L capacity passenger airbag shown in FIG.

The properties of the airbag fabric and the airbag thus obtained were evaluated and the results are shown in Table 1. The airbag of the present invention had the mechanical properties required for an airbag as well as the inflation and deployment characteristics.

COMPARATIVE EXAMPLE 5 Using a filament yarn made of the same nylon 6.6 fiber as in Example 2, a plain woven fabric having a warp and weft density of both 63 / inch was obtained in a water jet loom. Next, the woven fabric was scoured and dried in the same manner as in Comparative Example 3, and then heat-set at 180 ° C. for 1 minute to obtain an airbag base fabric. Next, a passenger seat bag having a capacity of 120 L was manufactured for these airbag base fabrics in the same manner as in Example 2.

The properties of the airbag fabric thus obtained were evaluated in the same manner as in Example 1, and are shown in Table 1. The airbag of Comparative Example 5 is inferior in terms of lightness and low air permeability,
There is also a problem that the tear strength is low.

Comparative Example 6 Total denier 420 denier, 144 filaments, strength 8.
Using a filament yarn consisting of polyethylene terephthalate fiber having an elongation of 8 g / denier and an elongation of 18%, a woven fabric having a flat structure in which the weaving density of the warp and the weft is 53 / inch was obtained with a rapier loom. Next, the woven fabric was scoured and dried in the same manner as in Comparative Example 3, then heat-set at 180 ° C. for 25 seconds, and heated at 150 ° C. between a flat metal roll and a plastic roll under a pressure of 25. Ton speed 15
One side was pressurized and compressed at m / min to obtain a base fabric for an airbag. Thereafter, a passenger airbag having a capacity of 120 L was produced in the same manner as in Example 2.

The characteristics of the airbag fabric and the airbag thus obtained were evaluated in the same manner as in Example 1.
It was shown to. The airbag of Comparative Example 6 is excellent in low air permeability, but has a problem that the weight of the base fabric is large and the tear strength is low.

[0039]

[Table 1]

[0040]

According to the present invention, it is possible to provide an airbag excellent in low air permeability while maintaining the necessary mechanical properties as an airbag. Further, it is possible to provide an inexpensive airbag as compared with the heat set product, and it is possible to promote the spread of the occupant protection system using the airbag.

[Brief description of the drawings]

FIG. 1 is a perspective view of a driver seat airbag.

FIG. 2 is a perspective view of a passenger airbag.

[Explanation of symbols]

 1: Occupant side cloth 2: Inflator side cloth 3: Opening 4: Vent hole 5: Body cloth 6: Side cloth

Claims (20)

[Claims] 1. A single fiber fineness of a polyamide fiber having a relative viscosity of 2.7 to 4.7 and containing an amino terminal group of 2 to 7.5 (× 10 ⁻⁵ mol / g) is 2 to 8 denier. The total fineness is 100-600 denier and the number of filaments is 30-
300 pieces, tensile strength is 5.5 g / d or more, elongation at break is 13% or more, and dry heat shrinkage at 150 ° C. is 1.5 to 5%.
And a woven fabric composed of filament yarns having a shrinkage in boiling water of 3.5 to 10%, and the air permeability of the woven fabric is adjusted to a pressure of 0.2 kg / cm ² of fluid (air). When the flow rate of the passing air is measured, 40cc
/ Cm ² / sec or less. 2. The method according to claim 1, wherein the polyamide fiber is nylon 6.6.
The base fabric for an airbag according to claim 1, which is a fiber. 3. The base fabric for an airbag according to claim 1, wherein the woven fabric simultaneously satisfies the following requirements (a) to (i). (a) Weight W (g / m ² ) W ≦ 250 (b) Thickness Th (mm) Th ≦ 0.35 (c) Weave density D (book / in) 40 ≦ D ≦ 80 (d) Tensile strength S (N / cm) S ≧ 500 (e) Elongation at break E (%) E ≧ 15 (f) Tear strength Te (N) Te ≧ 100 (g) Cover factor K 1800 ≦ K ≦ 2500 (h) Oil Y ( %) Y ≦ 0.2 (i) Crimp rate C (%) Average of warp and weft C ≦ 10 4. The filament yarn has a single yarn fineness of 4 to 7.
The base fabric for an airbag according to any one of claims 1 to 3, wherein the base fabric is a denier having a total fineness of 200 to 450 denier and a tensile strength of 6.5 g / d or more. 5. The base fabric for an airbag according to claim 1, wherein said filament yarn has a number of filaments in a range of 50 to 150. 6. The filament yarn has a dry heat shrinkage at 150 ° C. of 1.5 to 3.0% or less and a shrinkage in boiling water of 5.0.
The base fabric for an airbag according to any one of claims 1 to 3, wherein the base fabric is configured to have a content of up to 7.0%. 7. The airbag base fabric according to claim 1, wherein the woven fabric has a cover factor in the range of 2000 to 2350. 8. The airbag fabric according to claim 1, wherein the woven fabric contains an oil content of 0.04% or less. 9. The air according to claim 1, wherein the woven fabric has a crimp rate (%) in which a ratio of a weft crimp rate / a warp crimp rate is 0.4 to 0.7. Base fabric for bags. 10. The airbag fabric according to claim 1, wherein the woven fabric has a warp of 7 to 15% and a weft of 2 to 8%. 11. The airbag fabric according to claim 1, wherein the fabric is a 1 × 1 plain fabric. 12. The woven fabric has a fluid (air) of 0.2 kg.
/ Cm ² sink is adjusted to the pressure, as measured with an air flow through at that time, for an air bag according to any one of claims 1 to 3 is one having the following air permeability 30 cc / cm ² / sec Base cloth. 13. An airbag comprising the base fabric for an airbag according to claim 1. Description: 14. The airbag according to claim 13, wherein the reinforcing cloth is the same base cloth as the base cloth for the airbag. 15. The airbag according to claim 13, wherein the member that regulates the bag deployment shape is the same base fabric as the base fabric for the airbag. 16. The airbag according to claim 13, wherein the airbag is formed by sewing the airbag deployment shape formed by punching or fusing the airbag base fabric. 17. The airbag according to claim 16, wherein said peripheral portion is sewn only by single or double stitching. 18. A single fiber fineness of a polyamide fiber having a relative viscosity of 2.7 to 4.7 and containing an amino terminal group of 2 to 7.5 (× 10 ⁻⁵ mol / g) is 2 to 8 denier. The total fineness is 100 to 600 denier and the number of filaments is 30
３００300, tensile strength of 5.5 g / d or more, elongation at break of 13% or more, dry heat shrinkage at 150 ° C. of 1.5 to 5%
A method of manufacturing an airbag, comprising sewing a greige machine woven on a loom using a filament yarn having a shrinkage ratio in boiling water of 3.5 to 10% into a bag body. 19. The air according to claim 18, wherein the greige machine is immersed in a warm water bath containing a scouring agent at 20 to 100 ° C., squeezed with a mangle, and further dried at 80 to 150 ° C. before sewing on the bag. Bag manufacturing method. 20. When the air permeability of the woven fabric is adjusted to a pressure of 0.2 kg / cm ² by flowing a fluid (air) and the flow rate of the passing air is measured at that time, the air permeability is 40 cc / cm ² / sec or less. The method for manufacturing an airbag according to any one of claims 18 to 19.