Knit Fabric Resilience Without Elastane
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional knit fabrics using non-elastic hard yarns lack sufficient stretch and recovery, often requiring the addition of elastic fibers like elastane, which can cause sagging and wearer discomfort due to water retention and increased weight.
Innovation Solution
A knit structure incorporating a base inelastic strand and a modified resilient effect strand, formed via bicomponent fibers that provide stretch and recovery properties without the need for elastic fibers, achieved through strategic placement within the fabric structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If elastic fibers like elastane are braided onto hard yarns to improve stretch and recovery, then the knit structure gains higher stretch level and better recovery power, but the fabric weight increases and water retention occurs causing wearer discomfort
Solution Approach 1:
The patent changes the physical state and properties of polyester fibers through heat treatment to create inherent resilience. By heating the fabric to specific temperatures (e.g., 150-200°C) and controlling humidity conditions, the polyester fibers undergo structural changes that give them elastic-like recovery properties without adding elastane, thus avoiding the weight penalty while achieving reliable recovery performance
Solution Approach 2:
The patent creates a composite structure by combining heat-treated resilient polyester fibers with base polyester or cotton yarns in a knit fabric. This composite approach allows the resilient fibers to provide recovery function while the base yarns maintain the fabric's primary structure and comfort properties, eliminating the need for elastane blending
2Reliability
If elastic fibers like elastane are used to improve stretch and recovery, then the knit structure gains better recovery power, but sagging develops over time due to incomplete recovery
Solution Approach 1:
The patent applies controlled heat and humidity parameters to fundamentally change the physical properties of polyester fibers. By exposing the fibers to elevated temperatures (150-200°C) and specific relative humidity conditions (e.g., 65-80% RH), the fibers develop enhanced recovery characteristics that prevent sagging and maintain shape stability over time, achieving complete recovery without the degradation issues of elastane
3Reliability
If elastane is integrated into the knit fabric to improve recovery, then stretch level increases, but elastane retains water creating wearer discomfort
Solution Approach 1:
The patent extracts elastane from the fabric composition entirely and replaces its function with heat-treated polyester fibers. By removing the elastane component completely, the harmful water retention property is eliminated while the desired recovery performance is maintained through the alternative mechanism of thermally-modified polyester fiber resilience
Solution Approach 2:
The patent changes the hydrophobicity and moisture interaction properties of polyester fibers through thermal treatment. The heat treatment process (150-200°C at controlled humidity) modifies the fiber structure to reduce water retention while maintaining or enhancing recovery properties, thereby eliminating the water retention discomfort associated with elastane
4Reliability
If elastane is braided onto existing yarns to improve recovery, then stretch and recovery are enhanced, but the textile weight increases
Solution Approach 1:
The patent uses parameter changes (heat and humidity treatment) to transform ordinary polyester fibers into resilient, elastane-like fibers. This in-situ modification eliminates the need to add separate elastane components, maintaining the original fabric weight while achieving enhanced recovery performance through the modified physical properties of the existing polyester fibers
Solution Approach 2:
The patent makes polyester fibers multi-functional by enabling them to perform both structural support and elastic recovery functions. Through heat treatment, the same polyester fibers that provide fabric structure also gain recovery properties, eliminating the need for separate elastane fibers and thereby reducing overall textile weight
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 resulting fabric offers improved stretch and recovery while minimizing weight and water retention, enhancing comfort and breathability by using bicomponent fibers that create a textured surface for airflow and rapid moisture dispersion.
Implementation Method 1
The effect strand, while inelastic, is modified to be resilient
Data Source
AI summary
The present invention is directed toward an article of apparel formed of a textile having a knit structure (e.g., a circular knit structure) including a base strand and an effect strand. The base strand is inelastic. The effect strand, while inelastic, is modified to be resilient. The base strands are inserted at selected course locations within the knit structure. With this configuration, the knit structure possesses stretch and recovery properties. The resulting knit fabric may be utilized to make underwear (e.g., socks), top-weight garments (e.g., T-shirts), etc.