JPH0456653A - Air bag base cloth for vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to airbag base fabrics for vehicles, particularly for automobiles. More specifically, the present invention relates to an airbag base fabric for forming an airbag that is lightweight, flexible, and has excellent durability, and has good inflation response when the airbag is activated.

[Prior Art] As base fabrics for vehicle airbags, fabrics made of synthetic fibers coated with an elastomer such as synthetic rubber or natural rubber are generally known. However, in order to improve the performance of the airbag,
Since the elastomer is lined with a certain thickness, such base fabrics have a high basis weight, are hard, have poor foldability, and have a large storage volume.

In order to improve these drawbacks, Japanese Patent Application Laid-Open No. 64-702
47, airflow rate is 5CC by pressurizing one or both sides.
/cj/second or less and a basis weight of 250 g/f or less has been proposed.

However, although this airbag base fabric has a small expandability and storage capacity, it becomes paper-like due to the fact that the base fabric is pressurized and compressed by calendering, etc., resulting in a decrease in flexibility and tear strength and compression. There is also a problem in that the restoring force such as the amount of air permeable to the air is also reduced.

[Problems to be Solved by the Invention] In view of the problems of the prior art as mentioned above, an object of the present invention is to provide an airbag that is lightweight, has improved flexibility, foldability, and durability, and has a small storage volume. An object of the present invention is to provide a base fabric for an airbag that can be molded.

[Means for Solving the Problems] It has been found that the above-mentioned objects of the present invention can be achieved by defining the air permeability of the base fabric and the amount of fiber per unit area within specific ranges.

That is, the present invention comprises a fabric made of thermoplastic synthetic fibers, and the fabric is fabricated by the Frazier method (JIS L
-1096> Air flow rate measured at 0°5~7.5CC/
ait/sec and the amount of fiber per unit area is 40530
This is a vehicle airbag base fabric characterized by having a diameter of 65,520 D/inch.

The air flow rate of the fabric constituting the airbag base fabric of the present invention measured by the Frazier method (JIS L-1096) must be 0.5 to 7.5 cc/cd/sec, preferably 2.0 to 7.5 cc/cd/sec. 5.0 CC/cJ/sec. If the aeration rate is less than 0.5 CC/cJ/sec, the gas aeration rate from the fibers constituting the fabric is insufficient, and an air bag is formed similarly to the surface coating base fabric. In this case, it is necessary to install a vent hole for degassing, which complicates the airbag manufacturing process and makes it impossible to achieve the purpose of the present invention.On the other hand, when the airflow rate is 7.5
If it exceeds cc/cm2/sec, the amount of gas passing through the fibers constituting the fabric will be too large, making it impossible to achieve the object of the present invention.

Further, the amount of fiber per unit area of the base fabric is 40,530~
- Must be 65520D/0 inch, 4494
0 to 58800D/inch is preferable.

If the amount of fibers per unit area is less than 40,530 D/inch, the fibers constituting the base fabric will have a fine denier, and the density of the base fabric will decrease, resulting in a decrease in the strength of the base fabric. As a result, the burst pressure, which is an important characteristic of an airbag, becomes low, making it impossible to achieve the object of the present invention. On the other hand, 65520D
/inch, the density of the base fabric becomes too high, which goes against the weight reduction goal, making it difficult to mold the base fabric, and reducing production efficiency.

The fabric constituting the airbag base fabric of the present invention is preferably made of thermoplastic synthetic resin fibers such as polyamide fibers and polyester fibers. Further, examples of the fabric include woven fabrics, knitted fabrics, nonwoven fabrics, spunbond fabrics, etc., and woven fabrics are preferred. In the case of polyamide fibers, the total fineness of warp and weft yarns in a woven fabric is preferably 210 to 1260D, more preferably 300 to 840D. In addition, in the case of polyester, 250 to 1500D is suitable, and 500D is suitable.
-100OD is more suitable.

In addition, fabrics that are not coated with elastomer or the like on the surface make it easier to set the ventilation amount, are lighter, have better foldability, and reduce storage volume.
It is also preferable because it eliminates the need to provide gas vent holes when molded into an airbag.

[Effects] The vehicle airbag base fabric according to the present invention has the air permeability of the fabric and the amount of fiber per unit area within a specific range as described above, so when an airbag is molded, it is lightweight and flexible. This improves the flexibility and foldability, reduces the decrease in airflow rate over time, and reduces the storage volume.

[Example] EXAMPLES The effects of the present invention will be explained in detail with reference to Examples below.

The total fineness is 420D, 630D and 840D.
Using nylon 66" thread, the amount of fiber per unit area (total fineness D/inch) is 42000D/inch, 504
00D/0 inch, 52920D/inch and 588
After producing four types of base fabrics ([Li materials) with 00D/inch, we confirmed the change in air permeability (Fragir method) over time,
The results are shown in Table 1 below.

From the values in Table 1, it can be seen that the ventilation amount has hardly changed even after 12 months.

Margin below

Claims (2)

[Claims] (1) It is composed of a fabric made of thermoplastic synthetic fibers, and the airflow rate of the fabric measured by the Frazier method (JISL-1096) is 0.5 to 7.5 cc/cm^2/sec,
And the amount of fiber per unit area is 40,530 to 65,520D
/inch. (2) The vehicle airbag base fabric according to claim 1, wherein the fabric is a non-surface coated fabric.