Elastic Composite Yarn Segmentation for Flexibility and Strength
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Solution Overview
Problem
High modulus textile yarns, including conductive and fiber optic yarns, typically exhibit low bending capability and poor flexibility, making them impractical for applications requiring stretch and recovery properties, such as wearable clothing and flexible displays.
Innovation Solution
The development of elastic composite yarns comprising an elastic core member and an inelastic functional core member, surrounded by a composite covering that includes both elastic and inelastic covering members, allowing for controlled elongation and recovery while distributing stress evenly across the yarn.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high modulus filaments are used to provide strength and functional properties, then strength and functional properties are improved, but bending capability and flexibility deteriorate
Solution Approach 1:
The yarn is segmented into distinct functional components: inelastic functional filaments (stainless steel, optical fibers) provide strength and functionality, while separate elastic filaments (spandex) provide flexibility. This segmentation allows each component to perform its specialized function without compromising the other.
Solution Approach 2:
The invention creates a composite yarn structure combining inelastic functional filaments with elastic filaments. This composite approach integrates materials with contrasting properties (high modulus vs. high elasticity) into a unified yarn that exhibits both strength and flexibility simultaneously.
2Stability of the object's composition
If high modulus filaments are used to provide structural integrity, then structural integrity is improved, but flexibility and stretchability deteriorate
Solution Approach 1:
The yarn structure segments structural functions from adaptive functions. Inelastic functional filaments maintain structural integrity and functional properties, while elastic filaments independently provide adaptability and flexibility, allowing the yarn to conform to various shapes.
Solution Approach 2:
Different regions of the yarn have different properties: the inelastic functional filaments provide localized structural support and functionality, while the elastic filaments provide localized flexibility. This local differentiation allows the yarn to simultaneously maintain structure and adapt to deformation.
3Reliability
If metal fibers are used to provide conductivity and strength, then electrical properties and strength are improved, but elongation and elasticity deteriorate
Solution Approach 1:
The yarn segments electrical functionality from mechanical elasticity. Metal fibers (stainless steel) are segregated as distinct filaments that provide conductivity and strength, while separate spandex filaments provide elongation. This allows the yarn to stretch without compromising electrical continuity of the metal filaments.
Solution Approach 2:
The composite yarn combines conductive metal fibers with elastic spandex fibers in a unified structure. The metal fibers maintain electrical properties while the spandex fibers accommodate elongation, creating a material that exhibits both electrical reliability and mechanical elasticity.
4Illumination intensity
If optical fibers are used to provide light transmission, then optical properties are improved, but bending capability and flexibility deteriorate
Solution Approach 1:
The yarn segments optical functionality from mechanical flexibility. Optical fibers are segregated as distinct filaments that provide light transmission, while separate elastic filaments provide bending capability. This segmentation allows the optical fibers to transmit light while the elastic filaments enable the yarn to bend and flex.
Solution Approach 2:
The composite yarn integrates optical fibers with elastic materials, creating a unified structure where optical fibers provide illumination transmission and elastic filaments provide bending capability, allowing flexible optical applications.
5Reliability
If glass or silica fibers are used to provide dielectric properties and high frequency performance, then electrical insulation and signal transmission are improved, but flexibility and elongation deteriorate
Solution Approach 1:
The yarn segments dielectric functionality from mechanical flexibility. Glass or silica fibers are segregated as distinct filaments that provide signal transmission and electrical insulation, while separate elastic filaments provide flexibility and elongation, allowing the rigid functional filaments to be incorporated into flexible textile structures.
Solution Approach 2:
The composite yarn combines dielectric glass or silica fibers with elastic spandex fibers, creating a unified material that exhibits both high-frequency signal transmission capability and mechanical flexibility, enabling wearable electronic applications.
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 elastic composite yarns demonstrate improved flexibility and stretch recovery properties, enabling them to be processed into knitted, woven, or nonwoven fabrics that can conform to various shapes and provide special illumination or signal transmission effects, while maintaining structural integrity.
Implementation Method 1
an elastic core member having a relaxed unit length L and a drafted length of (N×L)
Implementation Method 2
The composite covering member has a relaxed length that is greater than the drafted length (N×L) of the elastic core member, such that substantially all of an elongating stress imposed on the composite yarn is carried by the elastic core member and the elastic covering member
Data Source
AI summary
An elastic composite yarn comprises a composite core and a composite covering. The composite core comprises an elastic core member and an inelastic functional core member. The composite covering comprises at least an elastic covering member and at least one inelastic covering member surrounding the elastic covering member, such that substantially all of an elongating stress imposed on the composite yarn is carried by the elastic core member and the elastic covering member.