KR101032146B1 - Fabrics for air bag cushion cover - Google Patents

Abstract

The present invention relates to an airbag cushion cover fabric, and more particularly, to an airbag cushion cover fabric for maintaining the folded shape of the airbag cushion, and to an airbag cushion cover fabric comprising nylon 6 fabric.

The airbag cushion cover fabric of the present invention maintains the folding state of the airbag cushion at room temperature, has excellent characteristics to withstand friction with the plastic cover, and during the operation of the inflator, the physical properties of the fabric itself are lowered by high temperature and high pressure, and thus the airbag is deployed. There is an advantage to make it easier.

Nylon 6, airbags, covers, fabric

Description

Fabric for airbag cushion cover {FABRICS FOR AIR BAG CUSHION COVER}

1 is a view showing a general airbag system.

Figure 2 is a schematic diagram showing the cutout and the connection section of the non-woven fabric cover for fixing the airbag cushion.

Figure 3 is a schematic diagram showing a tear strength measuring apparatus according to the American Society for Testing and Materials Standard (ASTM) D 2261.

Figure 4 is a schematic diagram showing a device for measuring the luminescence according to the American Society for Testing and Materials (ASTM) D 4032.

[Industrial use]

The present invention relates to an airbag cushion cover fabric, and more particularly, to an airbag cushion cover fabric for accommodating an airbag cushion for automobiles.

[Private Technology]

Generally, an air bag detects a collision shock applied to a vehicle at a speed of about 40 km / h or more at a speed of about 40 km / h, and then explodes a gunpowder to expel gas into the airbag cushion. It refers to a device that protects the driver and the passenger by supplying and inflating, and the structure of a general airbag cushion system is as shown in FIG.

As shown in FIG. 1, a general airbag cushion system includes an inflater 121 that generates gas by ignition of the primer 122, and an airbag cushion 124 that is expanded and deployed toward the driver of the driver's seat by the generated gas. Consists of the airbag cushion module 100 is mounted to the steering wheel 101, the impact sensor 130 for generating a shock signal in the collision, and the electron to ignite the primer 122 of the inflator 121 according to the shock signal It is configured to include a control module (Electronic Control Module) (110).

The airbag cushion system configured as described above detects an impact in the impact sensor 130 and transmits a signal to the electronic control module 110 when the vehicle collides at the front. At this time, the electronic control module 110 that recognizes this ignites the primer 122, and burns the gas generating agent inside the inflator 121. The gas generator thus burned inflates the airbag cushion 124 through rapid gas generation.

The inflated airbag cushion 124 partially absorbs the impact load caused by the collision while contacting the front upper body of the driver, and the inflated airbag cushion 124 as the head and chest of the driver move forward by inertia; In the event of a collision, the gas of the airbag cushion 124 is rapidly discharged to the discharge hole formed in the airbag cushion 124 and is cushioning the front part of the driver. Therefore, by effectively buffering the impact force transmitted to the driver during frontal collision, secondary injury can be reduced.                         

The airbag cushion used in the vehicle as described above is manufactured in a predetermined form, and then mounted on the handle of the vehicle in a folded state to minimize its volume. At this time, in order to maintain the folded state of the airbag cushion, the cover is mounted with the cushion covered. The automobile airbag cushion cover is applied to assemble and maintain the state of the automobile airbag cushion.

The conventional fabric for airbag cushion cover is made of the same material as nylon 66, which is the main material of automobile airbag cushion, for easy management of the manufacturing process of the airbag system, and has an incision in the center to facilitate tearing when deploying the airbag. .

However, nylon 66 fabric used as the main raw material of the car airbag cushion is expensive, high tensile strength, when using it as a cover of the car airbag cushion, there was a problem that the airbag cushion is not smooth deployment. In other words, if there is a portion of less incision, the airbag cushion may not be deployed in time or it may become inoperative and may cause fatal results.

In order to solve this problem, the gap between the incisions of the cover is increased, and the gap between the connecting nodes for maintaining the shape of the cover between the incisions has to be minimized. However, when the gap between the connecting nodes of the fabric for the automobile airbag cushion cover is minimized, the incision is cut to the portion that should not be cut by the laser cutter or the blade cutter, so that the state of being folded as the fabric for the automobile airbag cushion cover is not properly maintained. There is a problem. In particular, there is a problem that the workability is reduced when the car airbag cushion is directly mounted and assembled to the blasting apparatus or the vehicle.                         

In addition, in order to solve the above problems, some products may use a cover for fixing an airbag cushion using a nylon nonwoven fabric, but the burden on the cost is high, and the tear strength is high, so that when the airbag cushion is developed in an automobile, It may not tear properly and may cause problems with the deployment shape.

The present invention is to solve the above problems, an object of the present invention is excellent in mechanical properties at room temperature, excellent airbag cushion fixing ability, low temperature properties at high temperature and high pressure to facilitate the deployment of airbag cushion It is to provide a fabric for the cover.

In order to achieve the above object, the present invention provides an airbag cushion cover fabric which is made of nylon 6 fabric as an airbag cushion cover fabric for maintaining the folded shape of the airbag cushion.

Hereinafter, the present invention will be described in more detail.

The airbag cushion cover in the present invention is to cover the airbag cushion until the airbag assembly after manufacturing and folding the airbag cushion, maintaining the folded shape of the airbag cushion, and protects the airbag cushion from various external contamination and friction The cover refers to a fabric for airbag cushion cover refers to a fabric used to manufacture the cover.

In the general airbag cushion system shown in FIG. 1, when an impact is applied from the outside, gas is generated in the inflator 121 by ignition of the primer 122, and the airbag cushion 124 is generated by the generated gas. It is developed. At this time, the airbag cushion cover should be easily torn so that the airbag cushion can be well deployed, and in general, the airbag cushion cover should be kept in a folding state even with the vibration of the vehicle and be able to withstand the friction with the plastic cover.

In particular, the temperature of the inflator operation in the general airbag system is about 700 ℃, and the gas generated from the inflator is filled with the airbag cushion suddenly applied to the cover for the airbag cushion, deterioration of the basic physical properties due to friction at room temperature It should be less, the thickness is thin, the folding and storage properties should be good, it is preferable that the tear strength is low in the high temperature and high pressure state so that the cover can be easily torn.

As a general airbag cushion cover fabric, nylon 66 plain fabric or nylon nonwoven fabric woven with a rapier loom is used, but in the present invention, a fabric for airbag cushion cover is manufactured using a fabric made of nylon 6 yarn.

Nylon 6 is a linear polymer prepared from ??-caprolactam, and includes a repeating unit represented by the following Chemical Formula 1.

[Formula 1]

[HN (CH ₂ ) ₅ CO]-

Nylon 6 fiber is lighter and stronger than other fibers, and has excellent wear resistance and elasticity. In addition, the melting point is lower than that of nylon 66, but the manufacturing process is simple, and can be produced at a low cost, there is an advantage that is inferior to nylon 66 in various physical properties. However, when exposed to high temperature in the air it is characterized by deterioration occurs physical properties.

The present invention prepared a fabric using the nylon 6 fiber, and by deteriorating it, to prepare a fabric for airbag cushion cover.

The fabric for airbag cover of the present invention is not significantly affected by the fineness, but is preferably a woven fabric of nylon 6 fiber having a fineness of 400 to 440 denier.

The weaving density of the fabric is preferably the weft density 30 to 55 EA / inch and the warp density 30 to 55 EA / inch, more preferably the weft density 36 to 49 EA / inch and the warp density 36 to 49 EA / inch. . If weft density or warp density is less than 30 EA / inch, the ability to keep the airbag cushion folded may be impaired, and if it exceeds 55 EA / inch, it may interfere with the deployment of the airbag.

In addition, the thickness of the fabric is preferably 0.2 to 0.4 mm. When the thickness of the fabric is less than 0.2 mm, the performance of maintaining the folded state of the airbag cushion may deteriorate. When the thickness of the fabric exceeds 0.4 mm, tear strength may increase, which may interfere with the deployment of the airbag.

The airbag cushion cover fabric is preferably a tear strength of 14 to 20 kg / inch at room temperature, according to the American Material Testing Association (ASTM) D 2261 (Tongue Tear Method), 15 to 19 kg / inch Is more preferred. When the tear strength at room temperature is less than 14 kg / inch, it is impossible to maintain the folding state of the airbag cushion due to the vibration of the vehicle, and cannot tolerate friction with the plastic cover. Not torn can interfere with the deployment of the airbag cushion.

Also, After the airbag cushion cover fabric is left at 120 ° C. for 15 days for heat aging, the tear strength measured according to the American Society for Testing and Materials (ASTM) D 2261 is preferably 5 kg / inch or less, and 0.2 to 5 kg. more preferably / inch. If the tear strength after thermal aging is 5 kg / inch or more, it may interfere with the deployment of the airbag during the impact of the vehicle.

The fabric for the airbag cushion cover is preferably less than 1 kg, and more preferably 0.1 to 1 kg measured at room temperature according to the American Society for Testing and Materials Standard (ASTM) D 4032.

The yarn used in the fabric for the nylon 6 airbag cushion cover of the present invention may use nylon 6 yarns having various fineness, if desired, and can be woven using nylon 6 yarns having a fineness of 400 to 440 denier. The fabric may be manufactured using a conventional loom, preferably a rapier loom or a water jet loom, and the like, and more preferably a water jet loom or the like.

At this time, the weaving density is preferably weft density 30 to 55 EA / inch and warp density 30 to 55 EA / inch, and more preferably weft density 36 to 49 EA / inch and warp density 36 to 49 EA / inch. In addition, the thickness of the fabric is to be 0.2 to 0.4 mm.

The woven fabric is subjected to refining and heat setting steps. The refining process can be used as the conventional refining process of nylon 6 fabric, heat-setting step can be carried out for 1 to 3 minutes at 140 to 160 ℃.

The fabric for the airbag cushion cover manufactured as described above may be used as an airbag cushion cover by cutting to an appropriate shape as needed.

The airbag cushion cover of the present invention may include a cutout 22 and a connection node 23, as shown in FIG.

In the airbag cushion cover, the direction in which the cutout is formed is not limited to a specific direction, and may be formed in a weft direction, an inclined direction, or another diagonal direction according to the required tensile strength according to the volume and the degree of compression of the folded airbag cushion.

The method of forming the cutout in the airbag cushion cover is not limited to any particular method, and preferably, the cut may be performed using a laser cutting machine or a blade cutting machine.

Hereinafter, preferred embodiments of the present invention will be described. However, the following examples are only preferred embodiments of the present invention, and the present invention is not limited to the following examples.

Example 1

Using a water jet loom using nylon 6 yarn having a fineness of 420 deniers, a fabric having a weaving density of 49 × 36 EA / inch and a thickness of 0.276 mm was prepared, refined, and heat-set at 150 ° C. for 2 minutes to cover an airbag cushion. Fabric was prepared.

Comparative Example 1

Using a nylon 66 yarn of 420 denier, a fabric of 49 × 49 EA / inch and 0.315 mm thick was fabricated using a rapier loom, refined and heat-set at 180 ° C. for 2 minutes to prepare a fabric for airbag cushion cover. It was.

Comparative Example 2

A spunbond nylon 6 nonwoven fabric having a thickness of 0.425 mm and a fabric density of 180 g / m ² was used as the fabric for the airbag cushion cover.

Physical properties of Examples 1 and Comparative Examples 1 and 2 were measured by the following criteria.

(Thickness) American Material Testing Association Standard (ASTM) D 1777

After cutting the fabric prepared in Example 1 and Comparative Examples 1, 2 to 10mm horizontally and vertically, and then left at 20 ° C. and 65% RH for one day, after measuring three times per sample using a fluorometer, The average value was taken.

(Tear strength) American Material Testing Association Standard (ASTM) D 2261

For the fabrics prepared in Example 1 and Comparative Examples 1 and 2, the tear strength at room temperature and the tear strength after thermal aging after standing at 120 ° C. for 15 hours were measured. Figure 3 is a schematic diagram showing a tear strength measuring apparatus according to the American Society for Testing and Materials (ASTM) D 2261. After cutting the specimen 31 of the fabric as shown in Figure 3, the incision 32 in the weft and oblique directions, respectively, and the left and right fabrics of the cut portion was mounted to the clamp 33 of the tear strength measuring device. The strength was measured by rupturing the fabric while moving the respective clamps 33 up and down while the fabric was mounted.

(Lecture) American Institute of Material Testing, ASTM D 4032

Figure 4 is a schematic diagram showing a device for measuring the luminescence according to the American Society for Testing and Materials Standard (ASTM) D 4032. The measurement method is also called a circular bend method.

The device for measuring the ductility is composed of a support plate 42 and a pressing plate 43 having a circular hole 44 in the center, and the specimen 41 of the fabric for airbag cushion is cut to twice the size of the support It was folded in half and placed on the support 42.

Lecture was measured while pressing the fabric 41 on the support with a pressing plate 43.

Table 1 shows the physical properties measured by the above measuring method for the fabric for airbag cushion cover prepared in Example 1 and Comparative Examples 1, 2.

TABLE 1

division Example 1 Comparative Example 1 Comparative Example 2 Island degree (denier) 420 420 - Weaving Density (EA / inch)
(Bevel × weft) 49 × 36 49 × 49 - Thickness (mm) 0.276 0.315 0.425 Tear strength (room temperature) (kg / inch)
(Bevel × weft) 17 × 17 18 × 18 3.4 Tear strength (heat aging) (kg / inch)
(Bevel × weft) 3 × 1 12 × 12 3.0 Lecture
(kg) 0.5 0.8 0.5

As shown in Table 1, the airbag cushion cover fabric of Example 1 shows a tear strength similar to that of the airbag cushion cover fabric of Comparative Example 1, but after the heat aging at 120 ° C. for 15 hours, the tear strength is remarkably increased. It can be seen that the deterioration can improve the developability during inflator operation. In addition, it can be seen that the fabric for the airbag cushion cover of Example 1 is significantly lower in thickness and stiffness than the fabrics for the airbag cushion cover of Comparative Examples 1 and 2, thereby significantly improving folding and storage properties.

The airbag cushion cover fabric of the present invention maintains the folding state of the airbag cushion at room temperature, has excellent characteristics to withstand friction with the plastic cover, and during the operation of the inflator, the physical properties of the fabric itself are lowered by high temperature and high pressure, and thus the airbag is deployed. There is an advantage to make it easier.

Claims (7)

Fabric for airbag cushion cover to maintain the folded shape of the airbag cushion, Weaving density of the fabric is weft density of 36 to 49 EA / inch, inclination density of 36 to 49 EA / inch, The thickness of the fabric is 0.2 to 0.4 mm, The airbag cushion cover fabric has a tear strength of 5 kg / inch or less measured according to ASTM D2261 after thermal aging at 120 ° C. for 15 hours. Fabric for airbag cushion cover made of nylon 6 fabric. delete delete The fabric of claim 1, wherein the fabric for airbag cushion cover has a tear strength of 14 to 20 kg / inch, and the stiffness is 1.0 kg or less. delete Airbag cushion cover made of the fabric of claim 1. The airbag cushion cover of claim 6, wherein the airbag cushion cover includes an incision and a connection node.

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