Composite Yarn with Non-Texturized Core and Texturized Sheath
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Solution Overview
Problem
Existing composite yarns with elastic cores face challenges such as high costs due to the need for large amounts of cotton and other fibers, environmental concerns related to cotton production, and issues with yarn appearance and elasticity.
Innovation Solution
A composite yarn design featuring a synthetic core with a high percentage of non-texturized filaments, covered by a sheath of staple fibers, which reduces the amount of cotton required and improves environmental sustainability while maintaining excellent appearance and elasticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high amounts of staple fibers (particularly cotton) are used in the sheath to cover the elastic core, then the core is completely covered and does not surface through the sheath, but the cost increases and environmental impact worsens
Solution Approach 1:
The invention changes the physical state and structure of the core fibers from texturized to non-texturized (flat) configuration. This parameter change allows the core to be completely covered by the sheath at lower fiber amounts, eliminating the need for high-volume sheath materials while maintaining coverage reliability.
Solution Approach 2:
The invention creates a composite yarn structure with a specific configuration: non-texturized core fibers (30-70% of yarn weight) combined with texturized sheath fibers (30-70% of yarn weight). This composite structure achieves complete core coverage with reduced overall fiber quantity compared to conventional fully-texturized core yarns.
2Strength
If texturized core fibers are used to provide elasticity and volume, then the core has good elastic properties, but the core may surface through the sheath causing poor appearance
Solution Approach 1:
The invention applies different qualities to different parts of the yarn: the core fibers are non-texturized (flat) to prevent surfacing and ensure complete coverage, while the sheath fibers are texturized to provide the desired elastic properties and bulk. This local differentiation of fiber characteristics resolves the contradiction between elasticity and coverage.
Solution Approach 2:
Instead of the conventional approach where the core is texturized for elasticity, the invention inverts this by making the core non-texturized and flat. The elasticity function is then transferred to the sheath fibers, which are texturized. This inversion eliminates core surfacing while preserving elastic properties.
3Reliability
If non-texturized (flat) core fibers are used to prevent surfacing, then the core is completely covered, but the yarn may lack sufficient elasticity
Solution Approach 1:
The invention creates a composite yarn structure where non-texturized core fibers provide complete coverage and structural stability, while texturized sheath fibers contribute elasticity and bulk. The synergistic combination of these two fiber types with specific weight ratios (30-70% core, 30-70% sheath) achieves both complete core coverage and sufficient yarn elasticity.
Data Source
AI summary
A yarn (1) having a core (2) and a sheath (3), preferably comprising staple fibers, said core comprising at least one polymeric core fiber (21), preferably a plurality of polymeric core fibers (21), wherein the amount of the core fibers (21) is at least 35% by weight of the total weight of the yarn (1) and said core (2) and said sheath (3) are spun together.