Eccentric Sheath-Core Polyamide Fabric for Stretch and Wrinkle Control
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Solution Overview
Problem
Conventional polyamide fiber woven or knitted fabrics struggle to achieve both satisfactory stretch properties and wrinkle-free surface quality, especially during wet-heat processes like dyeing and scouring, which often result in poor elasticity and inhibited body movement.
Innovation Solution
The development of a woven or knitted fabric utilizing an eccentric sheath-core type polyamide composite fiber with an equilibrium moisture content of 6.3% or less, composed of specific polyamide ratios and structures, including nylon 610 as the sheath and nylon 6 or nylon 66 as the core, to enhance stretch properties and prevent wrinkles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If polyamide fiber woven or knitted fabrics are processed through wet-heat processes for scouring or dyeing, then the fabric can be colored and cleaned, but wrinkles develop on the surface and stretch properties deteriorate
Solution Approach 1:
The invention changes the moisture content parameter of the polyamide fiber to 6.3% or less, which fundamentally alters the fiber's behavior during wet-heat processes. This parameter change prevents the fiber from absorbing excessive moisture that would cause swelling and wrinkle formation, while still allowing the fabric to achieve desired stretch properties through controlled crimp development.
Solution Approach 2:
The invention performs preliminary crimp formation in the gray yarn or finished yarn stage, before the wet-heat processes that would normally cause wrinkles. By pre-establishing the crimp structure when the fiber has low moisture content, the fabric maintains its stretch properties even after subsequent scouring or dyeing operations.
2Manufacturing precision
If tension is applied in wet-heat processes to prevent wrinkles, then surface quality is maintained, but crimps cannot be sufficiently developed and stretch properties become poor
Solution Approach 1:
The invention changes the moisture content parameter to 6.3% or less, which decouples the relationship between wrinkle prevention and crimp development. At this low moisture level, the fiber does not swell during wet-heat processes, so crimps can develop naturally without requiring high tension that would inhibit stretch property formation.
3Manufacturing precision
If conventional polyamide fibers are used, then the fabric has good surface quality, but it lacks sufficient stretch properties to accommodate body movements
Solution Approach 1:
The invention changes the moisture content parameter to 6.3% or less, which enables the polyamide fiber to develop sufficient crimps during processing. These crimps provide the necessary stretch properties for body movement while maintaining good surface quality, as the low moisture content prevents excessive fiber swelling that would cause wrinkles.
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 fabric achieves excellent stretch properties and a comfortable wearing feel without inhibiting body movement, maintaining quality and surface smoothness, even after wet-heat processes, by controlling moisture content and viscosity ratios within the composite fiber.
Implementation Method 1
an equilibrium moisture content of 6.3% or less
Data Source
AI summary
Objects of the present invention are to provide a woven/knitted fabric that does not inhibit movement of the body and that has excellent wearing feel, and is particularly suitable for use in garments, as well as garments using the woven/knitted fabric. Provided is a woven/knitted fabric at least partially including a false-twist yarn composed of an eccentric sheath-core type polyamide composite fiber having an equilibrium moisture content of 6.3% or less, the woven/knitted fabric having a stress ratio at 15% elongation in the warp direction to the weft direction of from 0.25 to 2.0.