JPH08199449A - Fabric base for non-coated air bag and air bag - Google Patents

Abstract

PURPOSE: To produce a base fabric for non-coated air bags, which is constituted with the weaving yarns containing filaments having a non-round cross section of a specific filament modification degree, where the non-round cross section of the filament is deformed at the crossing points of fabrics, and as a result, the warp yarn and the weft yarn bite each other to reduce air permeability, markedly increased in the prevention of weaving texture fluctuation and sufficient in mechanical properties. CONSTITUTION: This base fabric is constituted with a yarn containing filaments each having a non-round cross section with 1.2-1.5 modification degree, where the yarns constituting the fabric bite each other at the crossing points of fabrics to markedly increase the prevention of weaving texture fluctuation. When the fabric is press-treated, the fabric texture is densified to further lower its air permeability and improve the interlacing properties between filaments or yarns having modified cross sections.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-coated airbag base cloth and an airbag which absorb an impact of an occupant at the time of a vehicle collision and protect the impact, and which simultaneously have excellent low air permeability and anti-blindness. It is a thing.

[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, an air bag is made of a plain woven fabric using nylon 66 or nylon 6 filament yarn of 300 to 1000 denier and chloroprene or chlorosulfonated olefin for improving heat resistance, flame retardancy and air barrier property. It was made by applying an elastomer resin such as a synthetic rubber such as silicone, cutting the laminated base cloth, and sewing it into a bag.

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 adopted. With respect to the base cloth, normally, in the case of a chloroprene elastomer resin, the surface of the base cloth is 90 to 120
It was not preferable because it was applied g / m ² and was considerably heavy, the texture was rough and hard, and when the air bag was inflated, it could be scratched if it came into contact with the face. In addition, there is a problem that it is difficult to fold in terms of storability.
Further, in the case of a silicone elastomer resin having more excellent heat resistance and cold resistance as compared with the chloroprene elastomer resin, the coating amount is 40 to 60 g / m ² and the weight is reduced,
Although it has improved considerably in terms of texture and storability, it is still not enough. 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, non-coated airbags by increasing the density of polyamide fiber such as nylon 66 and nylon 6 and polyester fiber woven fabric are being studied. For example, JP-A-64-70247
A method of applying pressure compression has been proposed in Japanese Patent Laid-Open Publication No. 2003-242242, and flexibility and storability have been considerably improved, but there is a problem that low air permeability and anti-blurring property are not sufficient, and a satisfactory airbag base No cloth is obtained.

[0006]

SUMMARY OF THE INVENTION In view of the drawbacks of the conventional airbag, an object of the present invention is to satisfy the low air permeability and the anti-blurring property while maintaining the mechanical characteristics required for the airbag. It is intended to provide a base fabric for a non-coated airbag and an airbag made of the same.

[0007]

In order to achieve the above object, the present invention has the following constitution. That is, the base fabric for a non-coated airbag of the present invention is a non-coated airbag made of a synthetic fiber fabric, and the fabric includes a single yarn having a non-circular cross section with a single yarn deformation degree of 1.2 to 5.0. A single yarn composed of a woven yarn and having the non-circular cross section is deformed at an intersection of the cloth, and the warp and the weft are meshed with each other, and the airbag of the present invention is It is characterized by being configured using such a non-coated airbag base fabric.

[0008]

According to the present invention, the synthetic fiber woven yarn constituting the base fabric for a non-coated airbag is constituted by a single yarn having a non-circular cross-section with a single yarn deformation degree of 1.2 to 5.0, and the fabric It has been clarified that the weaving yarns constituting the above-mentioned yarns are engaged with each other at a crossing point where they cross each other to remarkably improve the anti-blurring property.

The synthetic fiber cloth in the present invention includes nylon 6.6, nylon 6, nylon 12, nylon 4
.6, and a copolymer of nylon 6 and nylon 6.6,
Polyamide glycol such as polyalkylene glycol, dicarboxylic acid or amine copolymerized with nylon, homopolyester such as polyethylene terephthalate and polybutylene terephthalate, isophthalic acid, 5-sodium sulfoisophthalic acid or adipine as the acid component constituting the repeating unit of polyester Consists of polyester fiber copolymerized with aliphatic dicarboxylic acid such as acid, aramid fiber represented by copolymerization with para-phenylene terephthalamide and aromatic ether, rayon fiber, sulfone fiber, ultra high molecular weight polyethylene fiber, etc. Synthetic fiber cloth or the like is used. Among these, a synthetic fiber cloth composed of nylon 6.6, nylon 6 fiber and polyester fiber is particularly preferable. Such fibers may contain various additives that are usually used for improving the productivity or the characteristics in the manufacturing process or processing process of the raw yarn. For example, thermal stability, antioxidant, light stabilizer, leveling agent, antistatic agent, plasticizer, thickener, pigment, flame retardant and the like may be contained.

Further, as the structure of the cloth, plain weave, twill weave,
Textiles such as satin weave and their modified weaves, multiaxial weaves, and non-woven fabrics and knits are used. Among these, plain weaves are particularly preferable because of their excellent mechanical properties and thinness. The strength of the single fibers constituting the woven fabric is not particularly limited, but is preferably 5 g / denier or more, more preferably 7 g / denier or more, and the fineness and total amount of the single fibers constituting the woven fabric are The fineness is not particularly limited as long as it satisfies the mechanical properties required for a non-coated airbag, but preferably the single yarn fineness is 1 to 7 denier and the total fineness is 200 to 100.
0 denier is good. As a woven fabric, a cover factor of 1800 or more is preferable from the viewpoint of non-breathability, that is, airtightness, a tear strength of 10 kgf or more, and a basis weight of 25.
0 g / m ² or less, thickness 0.4 mm or less, tensile strength 1
80 kgf / 3 cm or more and a breaking elongation of 15% or more are preferably used in terms of mechanical properties, flexibility and storability required for a non-coated airbag. Here, the cover factor means that the total warp fineness is D1, the warp density is N1, the weft total fineness is D2, and the warp density is N2 (D1
) ^1/2 x N1 + (D2) ^1/2 x N2. A water jet loom, an air jet loom, and a rapier loom are preferable as the loom used in the weaving process.

On the other hand, for the filaments constituting the synthetic fiber cloth of the present invention, the method of melt-spinning of modified cross-section yarn is applied. That is, a polymer chip is melted, spun through a spinneret having a non-circular hole shape of Y type or T type, then, a cooling spinning oil agent is applied, stretched and wound. In addition, each single yarn forming the filament has an irregular cross section, and the single yarn deformation degree is 1.2 to 5.
It is essential that the range is 0. The degree of single yarn deformation is 1.
When it is less than 2, the difference from the yarn having a circular cross section is not substantially noticeable, the entanglement effect is small, and when the degree of deformation of the single yarn is more than 5.0, voids are easily generated between the single yarns, which is not preferable. As a method for forming the entanglement between the single yarns in the filament composed of each single yarn having a single yarn deformation degree of 1.2 to 5.0, an air or steam processing nozzle is used to bring the filaments into an overfeed state, It can be obtained by applying a stream of nitrogen gas or steam to disturb the fluid.

The pressure compression referred to in the present invention is extremely important for imparting low air permeability. By compressing under pressure, the structure of the cloth is filled and compacted, and the physical filling effect further improves low air permeability and entanglement between single yarns or yarns of irregular cross section.

The pressure and compression method is carried out by a roll method in which a cloth is pressed between the rolls by means of a device having a pair of flat rolls, or a pressure press device is used for a fixed time. Although a pressing method or the like can be applied, the roll method is preferably used from the viewpoint of productivity. The material of the roll and the press may be any of metal, plastic, paper, wool, cotton, etc., or a combination thereof.

In the present invention, it is more preferable to press the cloth between the heating metal roll and the plastic roll or the paper roll at room temperature, but it may be cold-pressed or cold-pressed, or a combination thereof. However, it is not particularly limited. Also temperature, pressure,
The speed is not limited and can be appropriately set under desired conditions. Further, such pressure compression may be applied to one side or both sides of the synthetic fiber cloth.

By carrying out the heating / pressurizing and compression processing of the present invention, in addition to achieving low air permeability and storability,
In particular, the feature is that the single yarn constituting the woven yarn is deformed to form a state in which the warp yarn and the weft yarn are in mesh with each other. Due to such characteristics, an excellent anti-blurring effect is achieved.

Further, according to the present invention, the air permeability of the pressure-compressed synthetic fiber cloth is 0.5 cc / cm ² /
More preferably, it is not more than sec.

[0017]

EXAMPLES The present invention will be described in more detail with reference to examples. The low air permeability, flexibility, storability, and anti-clogging property of the airbag base fabric in the examples were measured by the following methods.

Air permeability: JIS L1096.6.
It was measured according to the 27.1 A Frajure method.

Flexibility: The bending hardness in the warp and weft directions was measured by a KES-FB pure bending tester, and the mean value of the warp and the weft was shown.

Storability: A woven fabric of 10 cm × 20 cm is bent into a tubular shape, and the bulkiness when a load of 15 g is applied is measured. As a standard product, silicone rubber coated product (4
The relative value when the bulkiness of 5 g / m ² coated product is 100 is shown.

Anti-blurring property: A cloth cut into a circle having a diameter of 20 cm was put in a drum type rotating device and rotated at 50 ° C. for 15 minutes, and the degree of the blinding of the cloth was expressed by a grade.

Grade 5: No stitching Grade 4: Little stitching Grade 3: There is stitching Grade 2: Many stitching Grade 1: Marked stitching Example 1 Single yarn deformation degree is 2.5 Using a filament yarn composed of nylon 6.6 fiber having a total fineness of 420 denier, 72 filaments, a strength of 9.3 g / denier, and an elongation of 23% composed of a Y-shaped triangular cross-section, which is a warp yarn in a water jet loom. A plain weave fabric having a weft density of 53 yarns / inch was woven. Then, the woven fabric was scoured and dried by a usual method, and then heat set at 180 ° C. for 30 seconds. After that, the woven fabric is heated to 150 ° C. and pressed on one side at a pressure of 25 tons and at a speed of 15 m / min between a metal roll having a flat surface and a plastic roll at room temperature to form a non-coated airbag base fabric. Got

The characteristics of the thus obtained non-coated base fabric for airbag were evaluated and the results are shown in Table 1. The base fabric for a non-coated airbag of the present invention has low air permeability and is excellent in flexibility, storability and anti-blurring property.

Comparative Examples 1 to 3 Nylon 6 having a total fineness of 420 denier, 72 filaments, a strength of 9.5 g / denier and an elongation of 24%, which is composed of a Y-shaped triangular cross-section having a single yarn deformation degree of 1.1. Using a filament yarn composed of 6 fibers, a woven fabric having a plain design in which the weaving densities of the warp and the weft were both 53 / inch was woven with a water jet loom. On the other hand, a filament composed of a nylon 6.6 fiber having a total fineness of 420 denier, 72 filaments, a strength of 9.0 g / denier, and an elongation of 20%, which is composed of a Y-shaped triangular cross-section having a single yarn deformation degree of 6.5. Using a yarn, a woven fabric having a plain design in which both the warp yarn and the weft yarn have a weaving density of 53 yarns / inch was woven with a water jet loom.
Then, these woven fabrics were heat set and compressed under pressure in the same manner as in Example 1 to obtain base fabrics for non-coated airbags [Comparative Examples 1 and 2].

Comparative Example 3 was a non-airbag base fabric in which the same plain weave fabric as in Example 1 was not compressed.

The characteristics of the non-coated airbag base fabric thus obtained were evaluated in the same manner as in Example 1 and shown in Table 1. As can be seen from this, the non-coated airbag base fabric of Comparative Example 1 was excellent in flexibility and storability,
It was inferior in anti-blurring property, and the base fabrics for non-coated airbags of Comparative Examples 2 and 3 were inferior in flexibility and storability.

Example 2 Polyethylene terephthalate fiber having a total fineness of 420 denier, 144 filaments, a strength of 9.3 g / denier and an elongation of 16%, which was composed of a T-shaped triangular cross-section having a single yarn deformation degree of 2.2. A filament weave was used in an air jet loom to weave a woven fabric having a flat design in which the weaving densities of the warp and the weft were both 55 / inch. Next, the woven fabric was scoured and dried by a usual method, and then heat set at 180 ° C. for 30 seconds. After that, for the non-coated airbag, the woven fabric is heated to 155 ° C., and the pressure is 35 tons between the metal roll having a flat surface and the plastic roll at room temperature, and the pressure is compressed on both sides at a speed of 15 m / min. The base cloth was obtained.

The characteristics of the thus obtained non-coated base fabric for airbag were evaluated in the same manner as in Example 1 and shown in Table 1. The base fabric for a non-coated airbag of the present invention has low air permeability and is excellent in flexibility, storability and anti-blurring property.

Comparative Examples 4 to 6 Polyethylene terephthalate having a total fineness of 420 denier, 144 filaments, a strength of 9.3 g / denier, and an elongation of 16%, which is composed of a T-shaped triangular cross-section having a single yarn deformation degree of 1.1. Using a filament yarn of fibers, a woven fabric having a plain design in which both the weaving density of the warp and the weft was 55 yarns / inch was woven in an air jet loom. On the other hand, the single yarn deformation degree is 5.5.
Total fineness 420 composed of T-shaped triangular cross-section
Weaving a plain weave fabric with denier, 144 filaments, polyethylene terephthalate fiber filament having a strength of 9.3 g / denier and an elongation of 16% and a weave density of both warp and weft of 55 filaments / inch in an air jet loom. did. Then, these woven fabrics were heat set and compressed under pressure in the same manner as in Example 3 to obtain base fabrics for non-coated airbags [Comparative Examples 4 and 5].

Further, Comparative Example 6 was a non-airbag base fabric in which the same plain weave fabric as in Example 2 was not compressed under pressure.

The characteristics of the thus obtained non-coated base fabric for airbag were evaluated in the same manner as in Example 1 and shown in Table 1. The non-coated airbag base fabric of Comparative Example 4 was inferior in anti-blurring property, and the non-coated airbag base fabrics of Comparative Examples 5 and 6 were inferior in flexibility and storability.

Example 3 From nylon 6 fiber having a total fineness of 420 denier, 110 filaments, a strength of 9.7 g / denier and an elongation of 23%, which is composed of a Y-shaped triangular cross-section having a single yarn deformation degree of 1.5. Using the filament yarn, a woven fabric having a flat design with a weaving density of both warp and weft of 50 yarns / inch was woven with a rapier loom. Then, the woven fabric was scoured and dried by a usual method, and then heat set at 180 ° C. for 30 seconds. After a while
The woven fabric was heated to 130 ° C. and pressed between a metal roll having a flat surface and a paper roll at room temperature under a pressure of 30 tons and a speed of 20 m / min to compress both sides to obtain a base fabric for a non-coated airbag.

The characteristics of the thus obtained non-coated base fabric for airbag were evaluated in the same manner as in Example 1 and shown in Table 1. The non-coated airbag base fabric of the present invention has low air permeability, and is excellent in flexibility, storability, and anti-blurring property.

Comparative Examples 7 and 8 Total fineness of 420 denier having a true circular cross-sectional shape,
110 filaments, strength 9.7g / denier, elongation 2
Using a filament yarn made of 3% nylon 6 fiber,
A rapier loom was used to woven a plain weave fabric having a warp and weft density of 45 yarns / inch. Then, the woven fabric was scoured and dried by a usual method, and then heat set at 180 ° C. for 30 seconds. Then, using a comma coater, the woven fabric was coated with methyl vinyl silicone rubber so that the coating amount was 45 g, and vulcanized at 180 ° C. for 3 minutes to obtain a silicone rubber-coated airbag base fabric. Obtained [Comparative Example 7]. On the other hand, use a comma coater to coat the woven fabric with chloroprene rubber so that the coating amount becomes 95 g.
The coating was performed once and vulcanization was performed at 180 ° C. for 3 minutes to obtain a chloroprene rubber-coated airbag base fabric [Comparative Example 8].

The properties of the thus obtained non-coated base fabric for airbag were evaluated in the same manner as in Example 1 and shown in Table 1. As can be seen from the results, the rubber-coated airbag base fabrics of Comparative Examples 7 and 8 were excellent in low air permeability and anti-blurring property, but were inferior in flexibility and storability.

[0036]

[Table 1]

[0037]

EFFECTS OF THE INVENTION According to the present invention, while maintaining the mechanical strength required as an air bag, it is excellent in prevention of eyelashes during sewing and cutting, has low air permeability, and is flexible and easy to store. An uncoated airbag base fabric can be provided, and an occupant protection system using an airbag can be spread.

Claims (6)

[Claims] 1. A non-coated airbag made of synthetic fiber cloth, wherein the cloth has a single yarn deformation degree of 1.2 to 5.0.
A non-coated air comprising a woven yarn including a single yarn having a non-circular cross section, wherein the single yarn having the non-circular cross section is deformed at the intersection of the cloth, and the warp and the weft mesh with each other. Base fabric for bags. 2. The cloth is pressure-treated.
Base fabric for the non-coated airbag described. 3. The base fabric for a non-coated airbag according to claim 1, wherein the single yarn having a non-circular cross-sectional shape comprises at least 30% by weight of the single yarn constituting the woven yarn. 4. The base fabric for a non-coated airbag according to claim 1, wherein the single yarn having a non-circular cross-section has a triangular cross-section of Y-shape or T-shape, or a triangular cross-section of Y-shape and T-shape. . 5. The air permeability of the pressure-treated fabric is 0.5.
The base fabric for a non-coated airbag according to claim 1, which has a cc / cm ² / sec or less. 6. An airbag formed by using the non-coated airbag base cloth according to any one of claims 1 to 5.