KR100249484B1 - Cloth for airbag - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a fabric for airbags used in the manufacture of automotive airbags to protect drivers and occupants in motor vehicle crashes.

2. The technical problem to be solved by the invention

The present invention improves the airtightness and flexibility of the fabric by high-density weaving while solving the problems of the process complexity and cost increase according to the coating as an airbag fabric. It also improves weaving efficiency when weaving fabrics.

3. Summary of Solution to Invention

The warp and weft yarns are synthetic fiber filaments, and the strength of the weft yarns is higher than that of the warp yarns, and the weft weaving density is less than the warp weaving density fabrics for the non-coated airbag fabric is produced.

4. Important yodo of invention

The fabric of the present invention is used as a fabric for manufacturing automobile airbags.

Description

Airbag Fabric

The present invention relates to a fabric used in the manufacture of automotive airbags to protect drivers and occupants in the event of an accident such as a car crash.

Recently, various types of transportation, particularly automobiles, have been in practical use for airbag systems to protect passengers from impacts in the event of a crash. These airbags are usually stored in the steering wheel, dashboard of the vehicle, so the smaller the airbag, the better. In addition, the airbag is repeatedly subjected to high temperature heat and vibration caused by the automobile for a long time, and thus, should have excellent heat resistance and wear resistance.

Airbags for protecting passengers' heads and torso in the event of a car accident require characteristics such as airtightness, strength, flexibility and light weight. In the event of an accident, hot, high-pressure gas from the inflates inflates the airbag to protect passengers. At this time, the high-temperature, high-pressure gas generated in the inflate is in direct contact with the fabric of the airbag material, causing the airbag to expand. If the airbag fabric has low airtightness, the high temperature and high pressure gas will escape to the surface of the fabric and not only affect the deployment speed of the airbag, but also come into direct contact with the passenger's human body, causing harmful effects such as burns.

The airtightness of the fabric for airbags is preferably less than 0.5 CMF, measured by ASTM D 737 (measurement pressure 125 Pa). Here, CMF represents the amount of air (cc), that is, [cc / cm ² · second] unit that passed through the fabric through an area of cm ² per ^second . In addition, the fabric for the airbag is to be expanded rapidly by the high temperature and high pressure gas, so it must have excellent tensile strength. Preferably the tensile strength of the fabric should be at least 181 kg / inch as measured by ASTM D 5034 method. In addition, the fabric for the airbag should be provided with flexibility and lightness to improve the storage in the airbag module, and to reduce the weight of the vehicle.

Preferably it should be less than 0.04 cm thick and less than 250 g / m ² . Thus, the manufacturing method of the conventional airbag fabric for satisfying the various characteristics calculated | required by the airbag fabric is demonstrated.

First, Japanese Laid-Open Patent Publication No. 64-41438 uses a synthetic fiber filament having a single yarn fineness of 3 denier or less, and a weft yarn fineness of 420 deniers as warp and weft yarns, so that the weft weaving density is 24 pieces per inch. Afterwards, a method of manufacturing a fabric for an airbag is disclosed by applying rubber to a woven fabric for improving airtightness.

The method of coating the woven fabric surface with chloroprene, neoprene and silicone rubber, etc. improves the airtightness and hot air blocking effect of the fabric, but the process is complicated, manufacturing costs are increased, and there is a problem that it is difficult to recycle the airbag fabric.

In order to overcome various problems caused by such coating, Japanese Unexamined Patent Application Publication No. 6-306728 has a single yarn fineness of 0.6 to 0.3 denier and weaves fabric for airbags by using synthetic fiber filaments having 20 or more entanglements per meter as a weft yarn. How to do it is posted. At this time, the reason why the entanglement is given to the synthetic fiber filament is to prevent the occurrence of the fur on the warp during high-density weaving.

In this method, the coating process is omitted, thereby simplifying the process and reducing the manufacturing cost, but the airtightness of the fabric is lowered. That is, since the synthetic fiber filament used as the warp yarn has an entanglement portion, the synthetic fiber filament without the entangled portion cannot be woven at a higher density than the case where the synthetic fiber filament without the entangled yarn is used.

Korean Patent Laid-Open Publication No. 92-16632 discloses a method of manufacturing a fabric using synthetic fiber filament having a single yarn fineness of 3.5 to 4.5 dtex as a light weft yarn.

Such a method can improve the airtightness and flexibility of the fabric, but it occurs in the slope during weaving, virtually high density weaving is impossible.

Also, in order to overcome the above-mentioned problem of the occurrence of the stiffness in the warp when the synthetic filament is used as the inclined yarn, there is also proposed a method for the warp before weaving, but such a method does not properly remove in the washing process after weaving. The combustibility is increased, and due to the residual protection during long-term storage, bacteria are multiplied in the fabric, causing various problems of deteriorating physical properties.

In addition, Canadian Patent No. 974745 proposes a method of lowering the weft weaving density than the warp weaving density while using the same synthetic fiber as the weft yarn in order to overcome the problem of the occurrence of wool on the warp during the high density weaving. The fabric for airbags is inadequate as asymmetrical structure having a lower strength in the weft direction than the fabric strength in the inclined direction.

In addition, Korean Patent Publication No. 95-12684 proposes a method of weaving warp weaving density and weft weaving density to the same level while using the same synthetic fiber as the weft yarn.

In this way, the fabric can be manufactured with the same symmetrical structure as the fabric strength in the warp direction and the weft direction, but weaving is severe due to the occurrence of warp of warp during weaving, and weaving per unit time is high due to the high weft density. There is a problem that the efficiency is lowered.

The present invention seeks to solve the problems of the prior art described above. First, the airbag fabric of the present invention is suitable for the non-coated airbag fabric that does not coat rubber, etc., thereby simplifying the process and reducing the manufacturing cost. In addition, by using the synthetic fiber filament that has not undergone the process as the warp and weft, the problem of increased combustibility and deterioration of physical properties, and at the same time improve the airtightness of the fabric by high-density weaving.

In addition, since the strength of the weft yarn is higher than the strength of the warp yarns, even if the weft weaving density is lower than the warp weaving density, the fabric strength in the direction of the weft warp after weaving can be maintained at a similar level.

In addition, weaving weaving density lower than the weaving density of the weaving to provide a fabric for the air bag that can improve the weaving efficiency per unit time.

The present invention relates to a fabric for an airbag for protecting passengers from the impact of an automobile crash. More specifically, the present invention relates to fabrics for airbags that are woven using synthetic fiber filaments that are not entangled with arcs and weft yarns, and that the weft yarns have a higher strength than the warp yarns, and the weft weaving density is lower than the warp weaving density.

The fabric for airbags of the present invention is particularly suitable for non-coated airbag fabrics that do not have a rubber or the like coated on a fabric woven at a high density in order to simplify the process and reduce manufacturing costs. In addition, in order to improve the weaving efficiency, weaving weaving density is characterized in that weaving lower than the weaving density.

In addition, the present invention is characterized by using a yarn having a higher strength than the warp yarn as a weft in order to maintain the fabric strength in the direction of the warp weft.

As a result, even when the weft weaving density is lower than the warp weaving density, the fabric strength in the direction of the weft warp can be maintained at a similar level.

The present invention will be described in detail.

The non-coated airbag fabric of the present invention has a strength of 7.0 to 9.0 g / d, uses an untreated synthetic fiber filament as a warp, and uses a strength of 8.0 to 10.0 g / d, an untreated synthetic fiber filament. It is manufactured by weaving at high density using a weft yarn. At this time, the hardness difference of the weft yarn may vary depending on the density difference, but is preferably 2g / d or less. At this time, the total fineness of the warp and weft yarn is preferably 210 to 630 denier.

The weaving warp and weft density are set so that the weft weaving density is lower than the warp weaving density.

As described above, even when the weft weaving density is set lower than the inclination weaving density, since the weft strength is higher than the inclination strength as described above, the fabric strength in the weft direction after weaving may be maintained at a similar level. The weft density is preferably set at 75 to 90% of the warp density.

Depending on the fineness of the weft yarn, the inclination density is set to 50 to 80 bones / inch and the weft density is set to 30 to 70 bones / inch. As such, setting the weft weaving density lower than the warp weaving density can reduce the damage of the warp during weaving and can also improve the weaving efficiency per unit time.

The difference in weaving density of the theodolite may vary according to the strength difference of the theodolite, and the difference is preferably 30 or less.

In the present invention, the total fineness of the synthetic fiber filament used as warp and weft yarn is preferably 210 to 630 denier. If the total fineness is too low, the storage capacity in the airbag module is good, but the tear and tensile strength is not suitable as the fabric for the airbag, if the total fineness is too high, the tear and tensile strength is excellent, but the storage capacity in the airbag module is reduced.

Synthetic fiber filaments used as warp and weft yarns in the present invention are made of at least one resin selected from the group of thermoplastic resins consisting of polyamide 66, polyamide 6, polyamide 46 and polyester.

Fabric for air bag of the present invention is woven in plain weave, basket weave or twill weave, air permeability measured by ASTM D 737 (measurement pressure 125Pa) method is 0.50CMF or less.

The fabric for the airbag of the present invention can be manufactured at a low manufacturing cost by a simple process because it is not coated with rubber, etc., and does not treat synthetic fiber filaments used as warp and weft yarns to increase the burnability and change in physical properties due to the call. Can be prevented.

In addition, it is possible to manufacture a high-density fabric with a high weaving yield by lowering the weft weaving density than the warp weaving density. In addition, instead of lowering the weft density, weaving yarns with higher strength than warp yarns are used as weft yarns to maintain the fabric strength in the direction of the weft warp.

Air bag fabric of the present invention produced by the method described above has an air permeability of 0.50CMF or less, inclined fabric strength of 181 ~ 265kg / inch, weft fabric strength of 185 ~ 245kg / inch. At this time, the air permeability was measured by ASTM D 737 (measurement pressure 125 Pa) method and the strength of the fabric was measured by ASTM D 5034 method.

The strength of the yarn was measured by the JIS-L 1017 method.

Tensile testing machine: Low speed elongation type (made by Instron)

Sample length: 250 mm

Tensile Speed: 300mm / min

Ambient temperature: 25 ℃ 65% RH

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.

Example 1

Polyamide 66 filament with strength 8.2g / d and 210 denier yarn is used as warp without arc treatment, and polyamide 66 filament with 9.3g / d strength and 420 denier yarn is used as weft without arc treatment After weaving into plain weave, through normal refining and heat setting, fabrics for airbags having a warp density of 80 bones / inch and weft density of 68 bones / inch are manufactured. Weaving efficiency air permeability of the fabric produced and fabric strength in the weft warp direction is shown in Table 2.

EXAMPLES 2-4

Except for changing the fineness, strength and fabric density of the warp and weft as shown in Table 1 was carried out in the same manner as in Example 1 to prepare a fabric for the air bag.

Weaving efficiency, air permeability and weft weave strength of the fabrics are shown in Table 2.

EXAMPLES 5-7

Except for changing the type of fabric and fabric of the warp and weft polymer as shown in Table 1 was carried out in the same manner as in Example 1 to prepare a fabric for the air bag.

Weaving efficiency, air permeability and weft weave strength of the fabrics are shown in Table 2.

Comparative Examples 1 and 2

Except for changing the strength and fabric density of the warp and weft as shown in Table 1 was carried out in the same manner as in Example 1 to prepare a fabric for the air bag.

Weaving efficiency, air permeability and weft weave strength of the fabrics are shown in Table 2.

The non-coated airbag fabric of the present invention has a higher strength of the synthetic fiber filament used as the weft yarn than that of the synthetic fiber filament used as the warp yarn. Since the strength can be maintained at a similar level, it has a symmetrical structure required for the fabric for airbags.

In addition, as described above, by setting the weft weaving density lower than the warp weaving density, the weaving efficiency per unit time can be improved. In addition, the high-density weaving eliminates the need for a coating for improved airtightness, which simplifies the process and increases fabric flexibility.

Claims (6)

A warp and weft yarn used for weaving are synthetic fiber filaments, and the strength of the weft yarn is higher than the strength of the warp yarn, and the weft weaving density is characterized in that the weaving density is lower than the warp weave density. The fabric for an air bag according to claim 1, wherein the warp yarn has a strength of 7.0 to 9.0 g / d and the strength of the weft yarn is 8.0 to 10.0 g / d. The fabric for an air bag according to claim 1, wherein the weaving density of the warp yarn is 50 to 80 bones / inch, and the weaving density of the weft yarn is 30 to 70 bones / inch. The airbag fabric according to claim 1, wherein the air permeability of the fabric measured by ASTM D 737 (measurement pressure 125 Pa) is 0.50 CMF or less. The fabric of claim 1, wherein the fabric strength in the warp direction is 181 to 265 kg / inch and the fabric strength in the weft direction is 185 to 245 kg / inch, as measured by ASTM D 5034. An airbag fabric according to claim 1, wherein the total fineness of the warp and weft yarn is 210 denier or more and 630 denier or less.