Knit Fabric Composite Yarn Snagging Resistance
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Solution Overview
Problem
Knitted fabrics with excellent soft touch and stretchability are prone to snagging due to their looped structure, and existing methods to improve snagging resistance often compromise these desirable characteristics.
Innovation Solution
A knitted fabric using a composite yarn made from interlaced false-twist crimped yarns with S-direction and Z-direction torque, combined with a polyethylene terephthalate fiber containing ultraviolet ray absorbents and matting agents, which maintains soft touch and stretchability while enhancing snagging resistance through a multilayered structure and specific yarn processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the density of knitted fabric is increased to improve snagging resistance, then snagging resistance is improved, but soft touch and stretchability are impaired
Solution Approach 1:
The patent applies parameter changes by modifying the yarn structure through false-twist crimping and interlacing processes. The yarn is subjected to controlled twisting and heat treatment to create a crimped structure with specific torque characteristics, changing the physical parameters of the yarn to achieve snagging resistance while preserving fabric softness and stretchability.
Solution Approach 2:
The patent uses composite materials by combining multiple yarn processing techniques (false-twist crimping, interlacing, and torque balancing) to create a composite yarn structure. The yarn comprises crimped segments with S-direction and Z-direction torque that work together to provide snagging resistance while maintaining the desired fabric properties.
2Reliability
If a finishing agent is applied to solidify the fabric surface to improve snagging resistance, then snagging resistance is improved, but soft touch and stretchability are impaired
Solution Approach 1:
The patent extracts the need for external finishing agents by incorporating snagging resistance directly into the yarn structure itself. Through false-twist crimping and interlacing, the yarn inherently resists snagging without requiring additional surface treatments, thereby preserving soft touch and stretchability.
Solution Approach 2:
The yarn structure provides its own snagging resistance through its inherent crimped and interlaced design. The false-twist crimped structure with balanced torque creates a self-regulating mechanism that prevents snagging without external intervention, eliminating the need for finishing agents that would compromise fabric comfort.
3Reliability
If a thread is twisted to enhance constraint force to improve snagging resistance, then snagging resistance is improved, but soft touch and stretchability are impaired
Solution Approach 1:
The patent applies periodic action through the false-twist crimping process, which creates periodic twists and crimps along the yarn length. This periodic structuring provides consistent constraint force to prevent snagging while maintaining flexibility and stretchability, as the periodic crimped segments can deform and recover elastically.
Solution Approach 2:
The patent uses dynamics by creating a yarn structure with balanced torque that can dynamically adapt to stress. The interlaced crimped segments with S-direction and Z-direction torque work together to provide snagging resistance while allowing the yarn to dynamically deform and recover, preserving soft touch and stretchability.
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 knitted fabric achieves excellent snagging resistance without impairing soft touch and stretchability, with a high ultraviolet ray shielding rate and visible light opaqueness, suitable for sports clothing.
Implementation Method 1
a false-twist crimped yarn having S-direction torque and a false-twist crimped yarn having Z-direction torque
Implementation Method 2
the torque of the composite yarn is non-torque
Implementation Method 3
0.1 % by weight or more of an ultraviolet ray absorbent is contained in such a polyester fiber. On that occasion, in the knitted fabric, it is preferable that an ultraviolet ray shielding rate at a wavelength in the range of from 280 to 400 nm is 90 % or more
Implementation Method 4
0.2 % by weight or more of a matting agent is contained in the polyester fiber. On that occasion, in the knitted fabric, it is preferable that a visible light shielding rate at a wavelength in the range of from 400 to 700 nm is 60 % or more
Implementation Method 5
a stretchability in a lateral direction as measured according to JIS L1018 is 50 % or more. It is preferable that a recovery factor of stretchability in a lateral direction as measured according to JIS L1018 is 90 % or more
Data Source
AI summary
A knitted fabric containing a composite yarn is provided, which is characterized in that the composite yarn is constituted of two or more kinds of false-twist crimped yarns and has a torque of not more than 30 T/m.