JPH04287743A - Air bag - Google Patents

Abstract

PURPOSE:To prevent the reduction of the expanding function at a high temperature and improve the shock resistance by integrally connecting an outer periphery section with a woven texture, and covering the connecting lines of connection sections with a seal material to form a bag body in an air bag for a vehicle. CONSTITUTION:The outer periphery section of a bag body is integrally connected with a woven texture by a jacquard weaving machine with a nylon-66 multi-filament 420d/70f used for a warp yarn and a weft yarn to form the bag body section 1 of an air bag. The connecting lines 3 of the integral connection sections 2 of the bag body section 1 are covered with a seal material 4. Cross- linking reaction type urethane hot-melt resin is spray-coated on one side of a nylon long-fiber nonwoven fabric to form this seal material 4.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to air bags. More specifically, the present invention relates to an airbag having excellent impact resistance when expanded at high temperatures.

0002

2. Description of the Related Art Air bag devices are being put into practical use to prevent personal injury caused by automobile collisions. An airbag device is composed of a sensor that detects a collision of a vehicle, a gas generator that inflates the bag based on a signal from the sensor, and an airbag that expands with gas and absorbs the impact on the occupants in the event of a collision.

[0003] Such air bags are usually developed in order to improve heat resistance, flame retardancy, air shielding, etc.
As shown in Japanese Patent No. 692, a base fabric whose surface is coated and laminated with an elastomer such as halogen-containing rubber is cut into a bag shape, and the outer periphery is sewn with a sewing machine or the like. When this airbag actually operates, the reaction of the gas generating agent in the inflator, which is used to inflate the airbag, occurs extremely rapidly, and not only a significantly large force is applied to the inflating airbag, but also a large amount of force is applied to the inflator. The generated gas melts the suture thread in the sutured portion and passes through the hole penetrated by the sewing needle in the sutured portion, destroying the base fabric constituting the bag, significantly impairing the airbag's expansion function.

[0004] Therefore, as an air bag that does not rely on sutures, for example, Japanese Patent Laid-Open No. 63-312404 proposes an air bag having a bag body whose outer periphery is integrally joined with a woven structure. In airbags made of this bag body, it is possible to improve the weave density, improve the mechanical strength of the integral joints due to the weave structure, and improve the structure shift, etc., and the actual situation is quite satisfactory in terms of improved mechanical strength. However, in some cases, the gas generated inside the inflator causes the structure of the joint line of the integral joint to shift, and as the gas passes through it intensively, it melts the base fabric that makes up the bag, significantly impairing the airbag's expansion function. Sufficient improvement measures have not yet been taken regarding the problem of damage.

[0005]

[Problems to be Solved by the Invention] An object of the present invention is to prevent the deterioration of the expansion function of an airbag caused by tissue deviation of the joining line of an airbag consisting of a bag whose outer peripheral portion is integrally joined with a woven or knitted structure. The objective is to provide an airbag with excellent impact resistance.

[0006]

[Means for Solving the Problems] The present invention provides an airbag consisting of a bag whose outer periphery is integrally joined by a woven or knitted structure, and the joints of the integral joints are covered with a sealing material. FIG. 1 is a plan view of the airbag of the present invention, FIG. 2 is a sectional view taken along the line X-X' in FIG. 1, and FIG. FIG. 2 is a schematic cross-sectional view. FIG. 4 is a schematic diagram showing an overview of the airbag expansion test. The sealing material used in the present invention is not limited to any particular material as long as it has the function of covering the bonding line, and it is not particularly limited as long as it has the function of blocking or suppressing the passage of gas during expansion at high temperatures. It is preferable to consider factors such as workability, heat resistance, etc. There are some sealing materials that are made of fabric and adhesive, and some that are made of only adhesive. In the case of a product composed of fabric and adhesive, the fabric should be soft, light, and thin, but is not particularly limited as long as it satisfies the function of alleviating tissue misalignment at the joint line, suppressing gas passage, and workability. It is more preferable to use a fabric such as In terms of fabric weight, a fabric with a basis weight of 10 to 100 g/m2 is preferable;
Below 0g/m2, the function of preventing tissue displacement and suppressing gas passage is insufficient, and it is not possible to suppress the adhesive from passing through the surface.If it is above 100g/m2, the hardness of the seal increases and the airbag folds. It causes sexual defects. This fabric can be any general fabric collectively referred to as a woven fabric, a knitted fabric, or a nonwoven fabric, and may be used by cutting it into a tape shape in the warp direction, weft direction, or diagonal direction. Further, the tape may be provided with a notch or cut on one or both sides of the end surface of the tape in consideration of workability and the like.

Fibers forming the fabric include not only synthetic fibers and recycled fibers obtained by melt spinning, dry spinning, and wet spinning, but also natural fibers such as cotton and silk, as well as glass fibers, ceramic fibers, Inorganic fibers such as metal fibers can be used alone or in combination. In addition, the adhesive that is simultaneously formed with the fabric strengthens the bond with the airbag base fabric, alleviates tissue displacement caused by impact when the airbag is expanded, and further prevents damage to the bonding line due to high temperature gas. It is essential to prevent this. The material used as the adhesive is not particularly limited as long as it satisfies the above required performance, but rubbers such as chloroprene rubber, hypalon rubber, and epichlorohydrin rubber, resins such as vinyl chloride and chlorinated polyolefin, epoxy resins, One or more types of hot melt resins (solid) represented by macryl resin, isocyanate resin, urethane resin, polyamide, polyester polyurethane, etc., and polymerization reaction and crosslinking reaction types of these resins are used. It can be used as appropriate. The adhesive may be applied to a fabric for the sealing material in advance, or the fabric may be applied after being applied to the joint line where the outer periphery of the airbag is integrally joined.

[0008] The adhesive may be applied by any conventional processing method, such as 2-lining, laminating, spraying, printing, dipping, and scattering, by selecting an appropriate method. When using different materials, the application method may be divided into two or more times. The amount of adhesive can be selected depending on the required properties, but it is 5 to 500 g/m2, preferably 20 to 200 g/m2.
It should be within the range of 2. On the other hand, even in the case of a sealing material consisting only of adhesive, if it has the function of preventing tissue displacement on the joint line where it is integrated, and takes into account workability such as quick drying, it is especially The adhesive is not limited, and may be appropriately selected from among the adhesives composed of the fabric and the adhesive, and the application method and amount of adhesive are also the same.

[0009] In the present invention, the joining line covered with the sealing material refers to the hollow part of an airbag made of a bag whose outer peripheral part is integrally joined with a woven or knitted structure as shown in FIG. 1 or 2, that is, the bag body part. 1 and the integral joint part, and coating along the joint line preferably covers a width of 5 to 50 mm, including the bag body side and the integral joint part side, with the joint line approximately as the center line. If the thickness is less than 5 mm, the tissue misalignment mitigation effect is insufficient5
If it is 0 mm, the hardness and thickness will increase, resulting in poor foldability.

[0010] In the present invention, the airbag before being covered with the sealing material may have any size, size,
Of course, the shape is not particularly limited, and the airbag may be laminated with a halogen-containing elastomer, for example, it may have a laminated part partially, or it may have no laminated part at all. .

[0011] Furthermore, the airbag which is made of a bag whose outer periphery is integrally joined with a woven or knitted structure as referred to in the present invention is generally a so-called double bag in which the bag is formed by weaving or knitting. It is preferable to use a double-woven bag made of a woven or knitted fabric or a multi-woven or knitted fabric, with consideration given to dimensional stability, isotropy, etc. In addition, the constituent density is appropriately selected according to the total denier count of the fiber yarn, and the driving density is 10 for both warp and weft.
It is preferably in the range of ~200 lines/inch.

[0012] Also, regarding the structure, the structure of the bag body portion and the structure of the integral joint portion may be arbitrarily selected and are not particularly limited. For example, in the case of textiles, hand weaving, twill weaving, satin weaving, basket weaving, lattice weaving, etc. may be used alone or in combination. The lighter the weight of the bag, the better, but it should be selected in consideration of mechanical properties and is usually preferably 100 to 600 g/m2. It constitutes a bag body. The fiber materials include, for example, polyamide fibers such as nylon 6, 66, and 46; aramid fibers such as paraphenylene terephthalamide and copolymers with aromatic ether; polyester fibers such as polyalkylene terephthalate; Fully aromatic polyester fibers; vinylon fibers; rayon fibers; polyolefin fibers such as ultra-high molecular weight polyethylene; polyoxymethylene fibers; sulfone-based tissues such as paraphenylene sulfone and polysulfone; polyetheretherketone fibers; polyetherimide fibers; carbon In some cases, inorganic fibers such as glass fibers, ceramic fibers, and metal fibers may be used alone or in combination.

[0013] The above-mentioned fibers may contain various additives that are commonly used to improve productivity or properties in the manufacturing process or processing process of the raw yarn. For example, heat stabilizers,
It may also contain antioxidants, light stabilizers, smoothing agents, plasticizers, thickeners, pigments, brighteners, flame retardants, and the like. Further, in order to improve processing characteristics in subsequent steps such as weaving and elastomer coating, twisting, gluing, resin processing, etc. may be applied.

[0014]

[Examples] The present invention will be explained below with reference to Examples.

[0015]

[Example 1] A bag whose outer periphery is integrally joined with a woven structure as shown in Fig. 1 using a jacquard loom using nylon 66 multifilament 420d/70f in both the warp and weft, and the density of the bag body part is 46× The density of 46 fibers/inch is plain weave, and the density of the integral joint is 92 x 92 fibers/inch, and the density is 92 x 92 fibers/inch. An air bang was created by cutting along the outside and further providing an opening for attaching an inflator as shown in 3 in Figure 2.

[0016] Also, nylon long fiber nonwoven fabric (weighing 30g
/m2) by spraying 20g/m2 of crosslinking reaction type urethane hot melt resin on one side of the
A sealing material was obtained by cutting into mm width. This sealing material was pasted along the joint line of the integrally joined portion and ironed for 120×10 seconds. Table 1 shows the workability of pasting the sealant and the results of the air bag expansion test.

[0017]

[Example 2] Using the airbag of Example 1, the same hot melt resin as in Example 1 was coated on one side of a nylon 6 knitted fabric (basis weight 60 g/m2) as a sealing material, and the sealing material was cut into 25 mm width. I got it. This sealing material was pasted along the joint line of the integrally joined portion and ironed at 120° C. for 10 seconds. The results are shown in Table 1.

[0018]

[Example 3] Using the same airbag as in Examples 1 and 2, a toluene solution of chloroprene rubber (100%) was used as a sealing material.
g/m2 (solid content equivalent) is laminated on release paper and 8
Dry for 10 minutes at 0℃, cut into 25mm width pieces, and paste along the joint line of the integral joint at 160℃ using a hot press.
Thermocompression bonding was carried out for 1 minute. The results are shown in Table 1.

[0019]

[Comparative Example 1] A tension test was conducted using the airbag used in Examples 1, 2, and 3. The results are shown in Table 1. The air bag expansion test was conducted in the following manner. The bag 6 was expanded using the apparatus 10 shown in FIG. 4, and the degree of damage to the bag was observed. Attach the bag 7 to be measured to the inflator (GG6 manufactured by Bavaria) 9 via the mounting bracket 8 with the bolt 11.
and store it in the storage case 12 with rivets or the like.

The case was left in a thermostatic oven at 85° C. for 4 hours, and within 2 minutes after being taken out, the inflator 9 was ignited by the ignition power source 13 to inflate the air bag 7.

[0021]

[Table 1]

[0022]

Effects of the Invention The airbag of the present invention has an outer periphery made of a woven or knitted structure, and the joining line of the airbag is covered with a sealing material, which is made up of integrally joined bag bodies, and has excellent durability and can be expanded especially under high pressure. This improves reliability against destruction by gas and enables the rapid spread of airbag systems.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an airbag of the present invention.

FIG. 2 is a sectional view taken along line XX' in FIG. 1;

[Fig. 3] A cross-sectional view showing a state covered with a sealing material.
) is a sealing material with an adhesive coating layer formed on a fabric, (B)
1 and 2 show examples of sheet materials consisting only of adhesive film bands.

FIG. 4 shows a measuring device for evaluating tissue misalignment.

[Explanation of symbols]

1 Air bag body part 2 Air bag integral joint 3 Joining line 4 Sealing material made of fabric and adhesive 5 Sealing material with adhesive film only 6 Air bag opening 7 Air bag 8 Mounting bracket 9 Inflator 11 bolt 12 Storage case 13 Ignition power source 14 Pressure gauge 15 Measurement hole 16 Strain meter 17 Recorder

Claims (1)

[Claims] 1. An airbag comprising a bag whose outer periphery is integrally joined by a woven or knitted structure, wherein the joining line of the integrally joined part is covered with a sealing material.