Polyester Yarn for Airbag Fabric with Low Modulus
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Solution Overview
Problem
Conventional airbag fabrics face challenges in maintaining shape stability, mechanical properties, and air-tightness under severe conditions of high temperature and high humidity, with existing polyester yarns exhibiting high modulus and stiffness, which complicates installation and performance.
Innovation Solution
A polyester yarn with optimized diethylene glycol content (1.1 to 2.65 wt%) and initial modulus (100 g/d or less) is developed through melt-spinning and drawing processes, incorporating poly(ethylene terephthalate) as the main component, to enhance flexibility, packing properties, and resistance to degradation under harsh conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional polyester yarn is used for airbag fabric, then mechanical strength is improved, but flexibility and packing property deteriorate due to high modulus
Solution Approach 1:
The patent applies parameter changes by precisely controlling the diethylene glycol content (1.1-2.65 wt%) and initial modulus (100 g/d or less) of the polyester yarn. This optimization resolves the contradiction by adjusting material parameters to achieve both high mechanical strength and improved flexibility for better packing properties.
2Stability of the object's composition
If polyester yarn with high modulus is used, then shape stability is improved, but installation difficulty increases in narrow spaces
Solution Approach 1:
The patent resolves this contradiction by changing the modulus parameter to 100 g/d or less, which maintains sufficient shape stability while significantly improving flexibility for installation in narrow vehicle spaces.
3Reliability
If prior polyester yarn is used under high temperature and humidity conditions, then cost is reduced compared to polyamide, but mechanical properties and air-tightness deteriorate
Solution Approach 1:
The patent addresses this contradiction by optimizing the diethylene glycol content parameter (1.1-2.65 wt%), which enhances the polyester yarn's resistance to degradation under high temperature and humidity conditions, maintaining reliability without sacrificing cost-effectiveness.
4Strength
If nylon 66 is used for airbag fabric, then impact resistance is improved, but moisture and heat resistance deteriorate
Solution Approach 1:
The patent applies this principle by using polyester material (more resistant to moisture and heat) instead of polyamide, accepting that polyester requires optimized structural parameters (diethylene glycol content) to achieve comparable impact resistance, thereby resolving the material property trade-off.
Data Source
AI summary
Disclosed is a polyester yarn that can be used in a fabric for an airbag. In particular, a polyester yarn having a diethylene glycol content of 1.1 to 2.5 wt % and initial modulus of 100 g/d or less, a production method thereof, and a fabric for an airbag produced therefrom are disclosed. The polyester yarn has excellent moisture and heat resistance and light resistance, and maintained excellent mechanical properties after long-term aging under high temperature and high humidity conditions. Therefore, when applied to a fabric for an airbag, the polyester yarn provides excellent packing property, shape stability, and gas barrier effect, and the impact applied to a passenger is minimized, thereby safely protecting the passenger at the same time.