Layered Fiber Shielding Sheet for EMI Leakage and Curved Surface Fit
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Solution Overview
Problem
Existing electromagnetic wave shielding materials face challenges in achieving high-performance vertical shielding, preventing lateral leakage, and flexibility, especially when used in curved or stepped surfaces, due to issues with plating thickness and density distribution in fiber webs.
Innovation Solution
A method involving electroless plating of fiber webs with sequentially laminated layers of first, second, and third fiber webs, where densities satisfy specific relational expressions, and a conductive adhesive member is applied to enhance adhesion and flexibility, forming a metal-coated fiber web with a three-dimensional network structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the thickness and density of fiber web are increased to improve electromagnetic wave shielding performance, then vertical shielding performance is improved, but plating solution infiltration becomes difficult and metal layer formation in central portion is insufficient
Solution Approach 1:
The fiber web is divided into multiple layers with different density characteristics. The first and third fiber webs have higher density for shielding performance, while the second fiber web has lower density to facilitate plating solution infiltration. This segmentation allows both high shielding performance and effective plating to coexist.
Solution Approach 2:
Different regions of the fiber web structure are assigned different density properties. The outer layers (first and third fiber webs) have higher density for shielding, while the central layer (second fiber web) has lower density for plating infiltration. This local differentiation resolves the contradiction between overall shielding performance and local plating accessibility.
2Reliability
If metal plate is used for electromagnetic wave shielding, then shielding performance is achieved, but flexibility and stretchability are lost and deformation is difficult
Solution Approach 1:
The invention uses a fiber web structure instead of rigid metal plates. The fiber web can be flexible or stretchable, allowing the electromagnetic wave shielding material to adapt to curved or irregular surfaces while maintaining shielding performance through the metal layer formed by electroless plating.
Solution Approach 2:
The invention creates a composite structure combining flexible fiber web material with conductive metal layer. The fiber web provides flexibility and structural support, while the metal layer provides electromagnetic wave shielding, achieving both adaptability and shielding performance.
3Adaptability or versatility
If fiber web is used to secure flexibility, then adaptability is improved, but electromagnetic wave shielding performance does not reach required level
Solution Approach 1:
The invention combines flexible fiber web with conductive metal layer through electroless plating. The fiber web maintains flexibility while the metal layer provides the necessary electromagnetic wave shielding performance, achieving both adaptability and shielding reliability.
Solution Approach 2:
The multi-layer fiber web structure with specific density relationships enables both flexibility and shielding performance. The segmented structure allows plating solution infiltration while maintaining overall flexibility of the composite material.
4Reliability
If plating is performed on thick fiber web, then metal layer thickness is increased for better shielding, but plating solution cannot infiltrate central portion and metal layer is not formed uniformly
Solution Approach 1:
The fiber web is segmented into multiple layers with varying density. The central layer has lower density to allow plating solution infiltration, while outer layers have higher density for shielding performance. This ensures uniform metal layer formation throughout the thickness.
Solution Approach 2:
Different layers are assigned different density properties to optimize both plating infiltration and shielding performance. The central portion has lower density for uniform plating, while outer portions have higher density for shielding, achieving local optimization throughout the structure.
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 provides excellent vertical shielding performance, prevents electromagnetic wave leakage, and allows the sheet to conform to various mounting areas with thickness tolerances, ensuring effective adhesion to curved or stepped surfaces.
Implementation Method 1
operation (1) of manufacturing an electromagnetic wave shielding part having a thickness ranging from 100 μm to 300 μm by electroless plating a fiber web layer
Implementation Method 2
operation (2) of laminating a first conductive adhesive member on one surface of the electroless-plated first fiber web of the electromagnetic wave shielding part
Data Source
AI summary
Provided is a method for manufacturing an electromagnetic wave shielding sheet. The electromagnetic wave shielding sheet has excellent vertical shielding performance, prevents the lateral leakage of electromagnetic waves, has a good close contact even with a curved or stepped surface to be attached due to the excellent flexibility thereof, and has excellent compression characteristics, and therefore, it may be possible to realize an electromagnetic wave shielding sheet that can be used in various mounting areas that may have thickness tolerances.