False-Twist Textured Yarn With Irregular Surface for Worsted Feel
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Solution Overview
Problem
Existing false-twist textured yarns fail to simultaneously achieve natural appearance, dryness, resilience, and stretchability due to uniform cross-sectional shapes and smooth surfaces, limiting the worsted-wool feeling and functionality.
Innovation Solution
A false-twist textured yarn composed of polyester-based thermoplastic resins A and B with specific molecular weight differences, eccentric joint structure, and surface slits and cracks, achieving a thick-to-thin ratio and high stretch recovery rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If false-twist texturing is performed on multifilaments with close-packed structure, then the yarn structure is compact and smooth, but the surface becomes smooth and natural appearance cannot be obtained
Solution Approach 1:
The patent applies local quality by creating non-uniform cross-sectional shapes of single fibers within the multifilament yarn. Each fiber is designed with specific thick-to-thin ratios and irregular cross-sections, so that while the overall yarn structure remains compact through false-twist texturing, the surface exhibits natural unevenness and graininess that suppresses glare and enhances worsted-wool appearance.
2Shape
If draw is performed to impart thick-to-thin unevenness to composite fiber, then natural appearance is improved, but cross-sectional shape becomes uniform and dryness cannot be obtained
Solution Approach 1:
The patent applies local quality by creating non-uniform cross-sectional shapes of single fibers within the multifilament yarn. Each fiber is designed with specific thick-to-thin ratios and irregular cross-sections, so that while the overall yarn structure remains compact through false-twist texturing, the surface exhibits natural unevenness and graininess that suppresses glare and enhances worsted-wool appearance.
Solution Approach 2:
The patent applies asymmetry by deliberately designing fibers with non-uniform, irregular cross-sectional shapes rather than symmetric circular sections. This asymmetric fiber geometry creates surface unevenness and thick-to-thin variations that provide natural appearance and suppress glare, while the false-twist texturing process maintains overall yarn compactness through controlled twisting and heat setting.
3Strength
If multifilaments are close-packed in false-twist texturing, then yarn strength is improved, but surface becomes smooth and resilience is reduced
Solution Approach 1:
The patent applies local quality by creating non-uniform cross-sectional shapes of single fibers within the multifilament yarn. Each fiber is designed with specific thick-to-thin ratios and irregular cross-sections, so that while the overall yarn structure remains compact through false-twist texturing, the surface exhibits natural unevenness and graininess that suppresses glare and enhances worsted-wool appearance.
Data Source
AI summary
A false-twist textured yarn is provided exhibiting a high sensitiveness feel of worsted-wool having natural appearance with glare suppressed, and a composite false-twist textured yarn, a twist yarn, a woven or knitted fabric, and clothing including the false-twist textured yarn, the false-twist textured yarn including a polyester-based thermoplastic resin A and a polyester-based thermoplastic resin B and satisfying the following requirements: (1) a difference (MA−MB) between a weight-average molecular weight MA of the resin A and a weight-average molecular weight MB of the resin B is 2000 to 15000; (2) resins A and B are eccentrically joined; (3) an apparent thick-to-thin ratio (Dthick/Dthin) of the false twist textured yarn is 1.05 to 3.00; and (4) the false-twist textured yarn has a slit in a fiber axis direction and a crack in a direction substantially orthogonal to the fiber axis direction on a surface of the false-twist textured yarn.