Core Spun Elastic Composite Yarn for Denim Fabric Stability
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Solution Overview
Problem
Conventional stretch fabrics made from core spun spandex yarns suffer from limited elongation, stability issues, and a strong synthetic feel, with problems like grinning effect and low piecing strength, restricting their use in fabrics beyond filling and denim.
Innovation Solution
A core spun elastic composite yarn comprising an elastic performance filament and a staple spun yarn, surrounded by a fibrous sheath of staple fibers, which improves elongation, recovery, and hand feel, while reducing the grinning effect and enhancing piecing strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional core spun spandex yarn is used, then stretchability is achieved, but grinning effect and low piecing strength occur
Solution Approach 1:
The invention uses a composite yarn structure with elastic performance filament core and staple fiber cover, combining different material properties to achieve both strength and aesthetic appearance, eliminating grinning effect while maintaining piecing strength
Solution Approach 2:
The elastic performance filament is positioned at the core while staple fibers cover the surface, creating different functional zones: the core provides elasticity and strength, while the surface provides natural appearance and prevents grinning effect
2Ease of operation
If bi-component polyester filament is used, then synthetic feel is achieved, but natural hand feel is lost
Solution Approach 1:
Staple fibers are used to cover the synthetic polyester core, creating a natural-looking and feeling surface while maintaining the elastic properties of the core material
Solution Approach 2:
The staple fiber cover acts as an intermediary between the synthetic elastic core and the end user, masking the synthetic feel while allowing the elastic performance to remain
3Ease of manufacture
If piece dyeing is performed on bi-component polyester fabric, then two separate dyeing processes are required, but manufacturing complexity increases
Solution Approach 1:
The yarn structure is designed to be universally dyeable with a single process, as the staple fiber cover and core can be dyed together, eliminating the need for separate dyeing operations
4Stability of the object's composition
If conventional core spun yarn is used, then fabric width stability is affected, but fabric stability is reduced
Solution Approach 1:
The composite yarn structure with elastic core and stable staple fiber cover provides inherent width stability while maintaining overall fabric stability, eliminating the need for additional heat setting processes
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 composite yarn produces fabrics with excellent stretchability, improved recovery, and a more natural hand feel, suitable for denim and warp, with reduced grinning effect and increased piecing strength, eliminating the need for two dyeing processes and enhancing fabric stability.
Implementation Method 1
at least one elastic performance filament
Data Source
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AI summary
The present invention provides a core spun elastic composite yarn comprises a sheath of at least one hard fiber, at least one elastic performance filament and at least one staple spun yarn. Said at least one hard fibers has an English cotton count from Ne 4 to Ne 60, said at least one elastic performance filament has a denier from 20 to 140 and said at least one staple spun yarn is formed from natural and/or synthetic staple fibers having a cotton count of Ne 8 to 100.