Low-Absorption Crimped Polyamide Yarn for Wet-Heat Stretch
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional polyamide fibers struggle to maintain stretch properties during dyeing and wet-heat processes, leading to wrinkles and embossment, and require excessive tensile force, which degrades fabric quality and increases production costs.
Innovation Solution
A crimped polyamide yarn comprising at least 40% low water absorption polyamide with a water absorption ratio of 5% or less at 30°C and 90% RH, combined with a side-by-side composite structure of polymers with viscosity differences, to enhance stretch elongation and crimp retention ratios, allowing for high-stretch woven or knit fabrics without excessive tensile force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If polyamide fibers are used for woven or knit fabrics, then softness and touch feeling are improved, but stretch property is insufficient
Solution Approach 1:
The invention uses composite fibers combining polyamide and elastane in a core-sheath structure, where the elastane core provides stretch properties while the polyamide sheath maintains softness and touch feeling. This composite material approach resolves the contradiction by integrating materials with complementary properties.
2Strength
If elastic fibers or composite fibers with latent crimp performance are used to improve stretch property, then stretch property is improved, but dyeability and light resistance deteriorate
Solution Approach 1:
The core-sheath composite structure allows the polyamide sheath to provide good dyeability and light resistance while the elastane core provides stretch properties. This resolves the contradiction by separating functional requirements into different material components.
3Manufacturing precision
If tensile force is applied to woven or knit fabric in wet-heat process to maintain quality, then wrinkles and embossment are reduced, but crimp development is insufficient and stretch property deteriorates
Solution Approach 1:
The invention changes the water absorption parameter of the polyamide fiber to a specific range (4-7%) that allows crimp development without excessive tensile force during wet-heat processing. This parameter optimization resolves the contradiction between maintaining quality and preserving stretch properties.
4Ease of manufacture
If conventional polyamide fibers are used in dyeing process, then dyeing is performed, but water absorption causes swelling and wrinkles
Solution Approach 1:
The invention optimizes the water absorption parameter of polyamide fibers to a specific range (4-7%) that balances dyeing requirements with prevention of excessive swelling and wrinkle formation during the dyeing process.
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 crimped polyamide yarn effectively maintains high stretch properties and reduces wrinkles, enabling high-quality woven or knit fabrics with improved crimp retention and elongation recovery, even after wet-heat processes, while minimizing production costs.
Implementation Method 1
low water absorption polyamide having an average of water absorption ratio of 5% or less at a temperature of 30° C. and a relative humidity of 90% RH
Data Source
AI summary
The present invention provides a crimped polyamide yarn to which it is possible, using fibers that include low water absorption polyamide, to impart a stretch property and pliability such that it is possible for the inherent stretch properties of the crimped yarn to be appropriately expressed in a woven or knit fabric. The crimped polyamide yarn of the present invention is a side-by-side composite yarn which includes at least 40 mass % of low water absorption polyamide having an average of water absorption ratio of 5% or less at a temperature of 30° C. and a relative humidity (RH) of 90%, and in which the low water absorption polyamide is at least one component. The yarn is false-twisted, and has a crimp elongation ratio of 25% or more.