Air Bag Fabric Weave for Low Permeability Under Pressure
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Solution Overview
Problem
Existing air bag fabrics fail to maintain low air permeability under high-pressure conditions and after exposure to heat, which is crucial for high-speed deployment and long-term performance in air bags.
Innovation Solution
A fabric structure with a large contact area between warp and weft threads, featuring a contact angle of 80° or more and a radius of curvature of 400 μm or less, made from synthetic fibers with specific fineness and additives, and processed using high-tension weaving and calendering to suppress air permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resin coating is provided on the fabric to suppress air permeability, then air permeability under high pressure is reduced, but the fabric weight increases and deployment speed decreases
Solution Approach 1:
The invention removes the resin coating from the fabric structure, achieving air permeability suppression through the fabric's inherent weave structure and thread configuration alone, thereby eliminating the weight penalty associated with resin coatings while maintaining reliability
Solution Approach 2:
The invention creates local density variations through specific weave patterns where warp and weft threads are arranged to provide enhanced contact area at intersection points, achieving localized air permeability control without requiring heavy resin coating across the entire fabric surface
2Strength
If the fabric is made heavier to resist high pressure during deployment, then pressure resistance is improved, but deployment speed decreases
Solution Approach 1:
The fabric achieves pressure resistance through localized reinforcement at thread intersections with increased contact area, rather than uniformly increasing fabric weight, allowing high-speed deployment while maintaining the strength needed to resist high pressure during air bag inflation
Solution Approach 2:
The invention uses a composite weave structure combining synthetic fiber threads with specific geometric configurations at intersections, creating a lightweight yet strong fabric that resists high pressure without sacrificing deployment speed
3Reliability
If the contact angle between warp and weft threads is increased to suppress air permeability, then air permeability under high pressure is reduced, but manufacturing complexity increases
Solution Approach 1:
The invention controls the contact angle parameter between warp and weft threads within a specific range (60° to 120°) to optimize air permeability suppression while maintaining a weave structure that can be manufactured using conventional textile processes, avoiding excessive complexity
Data Source
AI summary
The purpose of the present invention is to provide a fabric for an air bag that, during high-pressure deployment at high speed, maintains low air permeability as an air bag and is capable of maintaining the low air permeability even after exposure to heat. This fabric for an air bag comprises a synthetic fiber and is characterized by the contact angle of a circumscribed circle at intersecting sections in which the warp thread and the weft thread come in contact in the cross section of the fabric is at least 80° in both the warp thread direction and the weft thread direction.