Stretchable Wire Member Elastic Modulus Control
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Solution Overview
Problem
Conventional stretchable wire members with stretchable wires on garments experience wrinkles and undulations when stretched and returned to their original state, leading to deformation issues.
Innovation Solution
A stretchable wire member comprising a fabric with a base layer, a conductive layer, and a protective layer, where the elastic modulus of the multilayer body ranges from 1 MPa to 6 MPa, allowing the conductive layer to stretch while maintaining fabric stretchability and reducing wrinkles and undulations upon stretching and release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the garment is stretched to a large degree, then the stretchable wire member can accommodate body movement, but wrinkles or undulations occur around the boundary between the garment and the stretchable wires when the garment is returned to its original state
Solution Approach 1:
The patent uses a composite multilayer structure consisting of a fabric layer, a base layer, a conductive layer, and a protective layer. Each layer has specific material properties that contribute to the overall performance. The base layer and protective layer are made of elastomeric materials with controlled elastic moduli to provide stretchability while maintaining shape stability and reducing wrinkles when the garment is stretched and returned to its original state.
Solution Approach 2:
The patent controls the elastic modulus parameters of the base layer (E′1: 1-10 MPa) and protective layer (E′2: 1-10 MPa) to achieve optimal balance between stretchability and wrinkle reduction. By adjusting these material parameters within specific ranges, the multilayer body achieves an elastic modulus (E′3) that prevents excessive deformation and wrinkle formation while maintaining adequate stretchability for body movement.
2Shape
If the elastic modulus of the multilayer body is increased to reduce wrinkles, then shape stability improves, but fabric stretchability may be compromised
Solution Approach 1:
The patent optimizes the elastic modulus parameters by setting E′1 and E′2 within 1-10 MPa ranges, which balances shape stability and stretchability. The resulting E′3 of the multilayer body falls within 1-6 MPa, providing sufficient rigidity to reduce wrinkles while maintaining adequate flexibility for body movement. This parameter optimization resolves the contradiction between shape stability and stretchability.
Solution Approach 2:
The multilayer composite structure allows different layers to contribute differently to overall performance. The fabric layer provides inherent stretchability, while the base layer and protective layer with controlled elastic moduli provide shape stability. The synergistic combination of these materials achieves both requirements simultaneously.
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 solution effectively minimizes wrinkles and undulations in the stretchable wire member, enabling it to restore its original pre-stretch state with reduced distortion, enhancing the comfort and durability of wearable devices.
Implementation Method 1
an elastic modulus E′3 of a multilayer body portion including the fabric, the base layer, and the protective layer ranges from 1 MPa to 6 MPa
Data Source
AI summary
An object is to solve problems associated with a stretchable wire member that includes, for example, a garment with stretchable wires formed thereon, that is, to solve the problems of wrinkles and undulations that often occur after the garment is stretched. A stretchable wire member includes a fabric; a base layer disposed on a surface of the fabric; a conductive layer disposed in part of the fabric, the conductive layer being on a surface of the base layer; and a protective layer covering the conductive layer. In the stretchable wire member, an elastic modulus E′3 of a multilayer body portion including the fabric, the base layer, and the protective layer ranges from 1 MPa to 6 MPa.