Modified EVOH Fiber Low-Temperature Fusion Stability
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Solution Overview
Problem
Existing thermally fusible fibers require high-temperature heat treatment for fusion, leading to limited use and potential texture impairment, and modified ethylene-vinyl alcohol copolymer (EVOH) fibers exhibit excessive shrinkage and storage instability when combined with polyester or polyamide fibers, especially in high-temperature and high-humidity environments.
Innovation Solution
A modified ethylene-vinyl alcohol copolymer fiber with 0.1 mol % to 10 mol % of a specific structural unit and 5 mol % to 55 mol % ethylene, having a crystallinity of 25% to 50% and a melting point of 60° C. to 160° C., produced by unevenly supplying modified and unmodified EVOH resins during spinning, allowing for low-temperature fusion and improved storage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermally fusible fibers are used to bond fabric, then anti-penetration and anti-fraying properties are improved, but high-temperature heat treatment is required which limits use range and may impair fabric texture
Solution Approach 1:
The patent changes the key parameter of melting point from above 100°C to 100°C or lower by modifying the EVOH copolymer composition and crystallinity, enabling low-temperature fusion that expands the range of applicable fabric types and processing conditions while maintaining bonding reliability
Solution Approach 2:
The patent uses composite material structure by combining EVOH copolymer with specific crystallinity control and surface modification to achieve both low-temperature fusibility and adequate bonding strength, resolving the contradiction between melting point reduction and bonding reliability
2Temperature
If modified EVOH fiber is used for low-temperature fusion, then fusion property is improved, but the fiber shows excessive shrinkage and poor storage stability in high-temperature and high-humidity environment
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: crystallinity (25-50%), modified component content (0.3-40 mol%), and ethylene content (5-55 mol%), achieving a balance where low-temperature fusion is enabled while storage stability is maintained through controlled crystalline structure
Solution Approach 2:
The patent applies local quality by creating specific structural zones within the fiber - controlling the distribution and amount of modified components in specific regions to enable low-temperature fusion at the fiber surface while maintaining stable crystalline core structure for storage stability
3Strength
If large amount of modified component is contained in molecular chain, then fusion property is improved, but fibers gradually shrink and become fixed to each other during storage
Solution Approach 1:
The patent applies partial action by incorporating modified components at an optimized level (0.3-40 mol%) rather than maximum content, providing sufficient fusion property through controlled modification while preventing excessive shrinkage and fiber fixation during storage
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The modified EVOH fibers enable fusion at 100° C. or lower, maintaining dimensional stability and preventing excessive shrinkage, thus providing anti-penetration and anti-fraying properties while maintaining fabric quality.
Implementation Method 1
the modified ethylene-vinyl alcohol copolymer fiber having a melting point of 60° C. to 160° C.
Implementation Method 2
having a crystallinity of 25% to 50%
Data Source
AI summary
A modified ethylene-vinyl alcohol copolymer fiber includes an ethylene-vinyl alcohol copolymer containing 0.1 to 10 mol % of a modified component and 5 to 55 mol % of ethylene, and has a crystallinity of 25% to 50%.