Non-Coated PET Airbag Fabric for Low Gas Permeability and Foldability
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Solution Overview
Problem
Conventional non-coated air bag fabrics made from polyethylene terephthalate suffer from poor foldability and high gas permeability, which are critical issues for effective occupant protection in vehicle collisions.
Innovation Solution
A non-coated air bag fabric with a cover factor of 2300 or more, a filling degree of 8200 or more, and a height difference between recess and protrusions of less than 130 μm, optimized by adjusting density, total fineness, and single fiber fineness to achieve low gas permeability and improved foldability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyethylene terephthalate fabric with high modulus is used to reduce cost, then cost is reduced, but foldability deteriorates and gas permeability increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the fineness of individual filaments (0.5-2.0 dtex) and the total fineness of yarns (100-300 dtex), along with optimizing weave density (30-60 threads/2.54cm) to achieve the desired balance between foldability and gas permeability while using cost-effective polyethylene terephthalate material
Solution Approach 2:
The patent employs composite material principles by creating a fabric structure that combines multiple parameters: specific filament fineness, yarn construction, and weave pattern optimization to achieve superior performance characteristics that neither single parameter could achieve alone, resulting in fabric with both good foldability and low gas permeability
2Reliability
If polyethylene terephthalate fabric with high modulus is used to reduce cost, then cost is reduced, but gas permeability increases
Solution Approach 1:
The patent applies parameter changes by precisely controlling the fineness of individual filaments (0.5-2.0 dtex) and the total fineness of yarns (100-300 dtex), along with optimizing weave density (30-60 threads/2.54cm) to achieve the desired balance between foldability and gas permeability while using cost-effective polyethylene terephthalate material
Solution Approach 2:
The patent employs composite material principles by creating a fabric structure that combines multiple parameters: specific filament fineness, yarn construction, and weave pattern optimization to achieve superior performance characteristics that neither single parameter could achieve alone, resulting in fabric with both good foldability and low gas permeability
3Object-generated harmful factors
If fabric density is increased to reduce gas permeability, then gas permeability is reduced, but foldability deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the fineness of individual filaments (0.5-2.0 dtex) and the total fineness of yarns (100-300 dtex), along with optimizing weave density (30-60 threads/2.54cm) to achieve the desired balance between foldability and gas permeability
Solution Approach 2:
The patent applies local quality principles by ensuring uniform distribution of fine filaments throughout the fabric structure, creating consistent local properties that collectively achieve the desired overall performance in both foldability and gas permeability resistance
Data Source
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AI summary
Provided is a non-coated air bag fabric made from polyethylene terephthalate, and the fabric is woven using fibers containing polyethylene terephthalate as the main raw material, the fabric having a cover factor of 2300 or more, Z calculated using the equation below is 8200 or more, and a height difference between recesses and protrusions on the surface of the fabric is less than 130 µm. Z = cover factor / thickness (mm) .