Conductive Fabric Metallization for Low-Cost Flexible Circuits
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Solution Overview
Problem
Conventional methods for creating conductive fabrics are costly due to the use of expensive silver paste and require a balance between conductivity and flexibility, making it difficult to produce high-quality conductive fabrics at a low cost.
Innovation Solution
A conductive fabric is produced using a metallic seed layer and a chemical-plating layer on a base cloth, with an optional carbon layer, allowing for controlled conductivity and heat generation efficiency while reducing costs by replacing silver paste with a more cost-effective process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silver paste is used as conductive paste, then conductivity is improved, but manufacturing cost increases
Solution Approach 1:
The patent changes the material parameters by replacing silver paste with a multi-layer metallic structure consisting of a seed layer (5-20 nm thickness) and a chemical plating layer (5-50 μm thickness). This parameter change in material composition and layer thickness achieves comparable conductivity while significantly reducing manufacturing cost by using less expensive metals in a controlled layered configuration
Solution Approach 2:
The patent creates a composite metallic circuit structure by combining different metal layers - a seed layer material (such as copper, aluminum, or stainless steel) with a chemical plating layer material (such as nickel, copper, or zinc). This composite structure leverages the advantages of each material to achieve both cost-effectiveness and required conductivity performance
2Reliability
If metallic thread content is increased to achieve desired conductivity, then conductivity is improved, but flexibility deteriorates
Solution Approach 1:
The patent replaces the mechanical weaving/knitting approach with metallic threads with a deposition-based approach using evaporation or sputtering to create a metallic seed layer, followed by chemical plating. This substitution eliminates the need for physical thread insertion and weaving, allowing the conductive circuit to be formed as a thin deposited layer that maintains fabric flexibility while achieving the required conductivity
Solution Approach 2:
The patent changes the structural parameters by using a thin seed layer (5-20 nm) combined with a chemical plating layer (5-50 μm) instead of thick metallic threads. This parameter optimization in layer thickness achieves the desired conductivity (such as 5Ω) while minimizing the impact on fabric flexibility and comfort
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 achieves enhanced conductivity and heat generation efficiency while maintaining flexibility, allowing for the production of high-quality conductive fabrics at a lower cost by adjusting the metal content in the chemical-plating layer.
Implementation Method 1
forming at least one metallic seed layer on the base cloth using evaporation or sputtering
Implementation Method 2
forming at least one metallic seed layer on the base cloth using evaporation or sputtering
Implementation Method 3
forming at least one chemical-plating layer over the metallic seed layer through a chemical plating method
Data Source
AI summary
The present invention provides a conductive fabric comprising base cloth and a conductive metallic circuit structure formed on the surface of the base cloth. The conductive metallic circuit structure comprises at least one metallic seed layer and at least one chemical-plating layer. The metallic seed layer is an evaporation-deposition layer or a sputter-deposition layer and has a circuit pattern. The chemical-plating layer is applied over the surface of the metallic seed layer. The conductive fabric has improved conductivity and heat generation efficiency.