Polyurethane Elastic Yarn Thermal Adhesion via Rosin and Cellulose Ester
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Solution Overview
Problem
Polyurethane elastic fibers used in clothing tend to fray at cut edges, leading to loss of stretchability and requiring time-consuming post-treatment processes, which restricts fabric design and imposes heat processing limitations, while existing solutions fail to achieve satisfactory thermal adhesion and unwinding properties.
Innovation Solution
A polyurethane elastic fiber composed of a thermoplastic polyurethane elastomer, rosin, and cellulose ester, with specific mass ratios and additives, is spun using a polymer diol and diisocyanate, enhancing thermal adhesion and unwinding properties without compromising spinnability and stretchability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyurethane elastic fiber is used in clothing, then stretchability and elasticity are improved, but fraying occurs at cut edges leading to loss of stretchability
Solution Approach 1:
The patent applies preliminary action by incorporating heat-sealing elastic fibers during the knitting process itself, rather than addressing fraying after it occurs. The low melting point polyurethane elastic fiber is integrated into the fabric structure during manufacturing, enabling heat-sealed edges that prevent fraying from the outset, thus eliminating the need for post-treatment while maintaining stretchability.
2Object-generated harmful factors
If trimming and sewing are performed to prevent fraying, then edge fraying is reduced, but production time increases and economic burden increases
Solution Approach 1:
The patent applies self-service by enabling the fabric edges to seal themselves through heat treatment. The low melting point polyurethane elastic fiber automatically melts and bonds at the cut edges when exposed to heat during processing, creating a self-sealing mechanism that eliminates the need for manual trimming and sewing operations, thereby reducing production time and costs.
3Strength
If low melting point polyurethane elastic fiber is used for heat-sealing, then thermal adhesion is improved, but fabric recoverability declines under high temperature conditions
Solution Approach 1:
The patent applies parameter changes by carefully controlling the melting point of the thermoplastic polyurethane elastomer within a specific range (60-120°C). This optimized parameter range allows the fiber to soften and bond at moderate temperatures during processing while maintaining structural integrity and elastic recoverability under normal wear conditions, thus achieving thermal adhesion without compromising fabric performance.
4Strength
If thermoplastic polyurethane elastomer is added to polyurethane elastic fiber, then thermal adhesion is improved, but fiber separation worsens during unwinding
Solution Approach 1:
The patent applies local quality by adding thermoplastic polyurethane elastomer in small, controlled amounts (0.1-10% by mass) rather than uniformly throughout the entire fiber structure. This localized addition provides sufficient thermal adhesion at edges and interfaces while minimizing the overall adhesive content that could cause fiber separation during unwinding and processing.
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 resulting fiber provides excellent thermal adhesiveness, stretchability, and unwinding properties, allowing for broader temperature range processing and improved productivity with reduced fiber breakage during weaving, resulting in high-quality fabrics with fewer processing restrictions.
Implementation Method 1
a polyurethane elastic fiber with high thermal adhesive strength in a wide temperature range
Implementation Method 2
excellent unwinding properties while also maintaining stretchability (permanent deformation and elasticity)
Data Source
AI summary
[Problem]To provide a polyurethane elastic fiber with excellent spinnability, stretchability, thermal adhesion, and unwinding properties, and a production method therefor.[Solution]A polyurethane elastic fiber having as a main component a polyurethane whose main starting materials are a polymer diol and a diisocyanate, wherein the polyurethane elastic fiber contains the three components in (a) through (c) below.(a) A thermoplastic polyurethane elastomer(b) A rosin and/or derivative thereof(c) A cellulose ester and/or derivative thereof