Polyamide fiber for airbag and method for producing same

By controlling the heat shrinking behavior of the fibers and specific process processing, the problem of uneven wrinkles and breathability of the airbag fabric after heating shrinkage is solved, the uniformity and stability of the fabric are achieved, and the occupant protection performance of the airbag is improved.

CN120519969AInactive Publication Date: 2025-08-22ASAHI KASEI KOGYO KABUSHIKI KAISHA
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Patent Information

Application Number
CN202510814723.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2020-10-05
Filing Date
2021-10-05
Publication Date
2025-08-22
Estimated Expiration
Not applicable · inactive patent

AI Technical Summary

Technical Problem

In the prior art, the fabric for airbags is prone to wrinkles and uneven breathability after heating and shrinking processing, and it is difficult to maintain the airbag internal pressure under high internal pressure, affecting the occupant protection effect.

Method used

By controlling the heat shrinkage behavior of the fiber, ensuring that the stress retention rate of the fiber is above 3.0%, the heat setting and relaxation process of specific temperature and time are adopted, and combined with water-based oil agent treatment, the heat shrinkage characteristics of the fiber are optimized.

Benefits of technology

It effectively suppresses fabric wrinkles, improves the uniformity and breathable characteristics of the fabric, ensures that the airbag remains stable under high internal pressure, and improves the occupant protection effect.

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Abstract

The present invention provides a polyamide fiber for an airbag and a method for manufacturing the same, which can suppress wrinkles of a fabric for an airbag after heat shrinkage processing and suppress variation in air permeability characteristics due to improvement of uniformity. The polyamide fiber for an airbag is characterized in that the fiber has a fineness of 200-800 dtex and a stress retention rate of 3.0% or more as determined by a predetermined step, and the polyamide fiber for an airbag is produced by a heat setting step and a relaxation step. The contact time between the roller reaching 190 DEG C or more and the strand is 30 msec or more and less than 110 msec, the temperature of the heat setting roller is 190 DEG C or more and 205 DEG C or less, the temperature of the relaxation roller is more than 100 DEG C and less than 190 DEG C, and the speed ratio of the relaxation roller to the heat setting roller satisfies the following formula: 1.00 < relaxation roller speed / heat setting roller speed < 1.10.
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