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JP-7136107-B2 - Airbag fabric, airbag coating fabric, and airbag using the same

JP7136107B2JP 7136107 B2JP7136107 B2JP 7136107B2JP-7136107-B2

Inventors

  • 上村 龍二
  • 明智 務

Assignees

  • 東洋紡株式会社
  • 東洋紡株式会社

Dates

Publication Date
20220913
Application Date
20180817
Priority Date
20170821

Claims (10)

  1. A woven fabric made of nylon 66 having a polymer sulfuric acid relative viscosity of 3.0 to 3.5, a total fineness of fibers constituting the woven fabric of 200 to 400 dtex, and a sliding resistance retention rate after heating at 210 ° C. for 30 seconds. A woven fabric for an airbag, characterized in that the average value in the weft and weft directions is 60% or more, and the residual shrinkage rate is 1.5% or less in both the weft and weft directions.
  2. 2. The airbag fabric according to claim 1, wherein the fibers constituting the fabric have a tensile strength of 7.5 to 9.3 cN/dtex.
  3. 3. The airbag fabric according to claim 1, wherein the fabric has a mass per unit area of 210 g/m< 2 > or less, a thickness of 0.3 mm or less, and a tensile strength of 550 N/cm or more.
  4. As a synthetic fiber, it has a tensile strength of 9.0 cN/dtex or more, a tensile elongation of less than 20%, a total fineness of 400 dtex or less, a single yarn fineness of 2 to 7 dtex, and a boiling water shrinkage of 7 to 12. %, and the nylon 66 multifilament having a single yarn cross-sectional diameter variation coefficient of 20% or less in CV% is used.
  5. 5. The airbag fabric according to any one of claims 1 to 4, which is produced by subjecting the greige fabric to a hot water shrinking process at 80°C or higher and a drying finishing process after weaving.
  6. An airbag using the airbag fabric according to any one of claims 1 to 5.
  7. A fabric made of nylon 66 having a polymer sulfuric acid relative viscosity of 3.0 to 3.5 , a compactness test coefficient of 8000 to 11000 mm 3 , and an average of the slip resistance retention rate in the longitudinal direction after heating at 210 ° C. for 30 seconds. 60% or more, and a residual shrinkage rate of 1.5% or less in both the weft and weft directions.
  8. 8. The coating fabric for airbags according to claim 7, wherein the fabric has a thickness of 0.3 mm or less and a tensile strength of 550 N/cm or more.
  9. 9. The coating fabric for airbags according to claim 7 or 8, wherein solvent-free silicone is used as the coating resin.
  10. An airbag using the airbag coating fabric according to any one of claims 7 to 9.

Description

TECHNICAL FIELD The present invention relates to airbag fabrics and airbag coating fabrics, which are automobile safety parts. The present invention relates to an airbag fabric and an airbag coating fabric capable of reducing damage to the sewn part of the airbag and stably deploying the airbag. In recent years, there have been development needs such as improving the design of the vehicle interior, improving the visibility of various meters from the driver's seat, maintaining vehicle interior space while vehicles are becoming smaller, and improving fuel efficiency while driving. Demands for lighter and more compact airbag module systems are rapidly increasing. The airbag module system consists of an airbag mainly made of fabric and a deployment device called an inflator that instantly inflates the airbag using compressed air or gunpowder as a detonator. In particular, airbags for frontal collisions such as the driver's seat and passenger's seat have a large impact on the interior design of the vehicle, so a lightweight, compact, and low-cost "pyro-type" inflator is used as an inflator. be done. Since this pyro-type inflator uses gunpowder, the temperature at which the gas is generated is high, and there is a tendency for the fabric used in the airbag to be greatly damaged by the hot air. In some cases, the holes are melted by the high-temperature gas that is concentratedly emitted from the holes of the sewn portion, and the adjacent holes are connected to each other, causing a problem of mesh connection. In order to achieve the above-mentioned development needs, the total fineness of the multifilament yarn used for the airbag fabric is reduced and the weave density of the fabric used for the airbag fabric is lowered for the purpose of making the airbag fabric lighter and more compact. As a result, the heat capacity per multifilament thread is reduced, and the damage per multifilament thread when hot air passes through the holes in the sewn portion increases. In addition, although the lightweight and compactness are improved, the tensile strength of the fabric for the airbag is lowered, and there is a problem that the mechanical performance of the airbag required for restraining the occupant cannot be obtained. Various investigations have been made to solve the problems associated with such lightweight and compact fabrics for airbags, but all of them have problems. In Patent Document 1, the thermal stress of the unraveling yarn of the airbag fabric is controlled by making the processing method of the airbag fabric milder, and the air permeability of the main fabric is suppressed when the airbag is deployed. Examples are disclosed. However, the thermal stress characteristics and the damage to the sewn part have not been verified, and when using raw yarn with a high boiling water shrinkage rate of over 8.5%, the processing conditions were mild. Due to this, the residual shrinkage rate is high, and there is concern about the stability of the shape and physical properties, and there is a possibility that the airbag cannot be deployed uniformly. In Patent Document 2, mechanical properties are improved by using high-strength yarn with a tensile strength of 9.0 cN / dtex or more instead of the tensile strength (8.5 cN / dtex) of conventional general nylon yarn. It is described to provide an airbag fabric that is excellent in flexibility, thinness, and lightness while maintaining the properties. In the present invention, in order to suppress the occurrence of fluff during the weaving process due to the "low elongation" that occurs due to the manufacturing principle when the strength of the raw yarn is increased, and to exhibit the anti-displacement property of the fabric, during weaving It is necessary to weave at a fairly high tension. Therefore, it is characterized by using a resin with a higher polymerization degree and higher viscosity than general, and producing and using a raw yarn with a tensile elongation of 20% or more. However, the use of a high-viscosity resin as a raw material has the problem of poor versatility in that it is difficult to apply in existing facilities, and the use of a resin with a high degree of polymerization has the problem of poor cost efficiency. Furthermore, even though raw yarn with high tensile elongation is used, it is necessary to weave at high tension, so the rotation speed of the loom is relatively moderate at 500 to 600 rpm so as not to increase the defect rate. Conditions are set based on numbers, and productivity is not considered. In addition, anti-displacement property under high temperature conditions, which is assumed when airbags are deployed, has not been studied, and in particular, the shrinkage conditions of raw yarn and the effect of fabric misalignment due to thermal stress have not been studied. do not have. Japanese Unexamined Patent Application Publication No. 2011-202340JP 2013-189744 A It is a figure regarding the preparation method of the test piece for resi