Shielding Laminate Structure for Shape Retention After Forming
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electromagnetic wave shielding materials face challenges in maintaining shape retention after forming processes due to spring-back forces, particularly in lower frequency ranges, which affects industrial production efficiency.
Innovation Solution
Incorporating a laminate structure with non-magnetic resin layers and non-magnetic or ferromagnetic metal layers, with anisotropy at break (Rc) values of 0 or less or 1 or more, to enhance shape retention properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a drawing process is applied to electromagnetic wave shielding materials to match shapes of casings or electronic components, then the shape conformity is improved, but the shape retention property deteriorates due to spring-back forces
Solution Approach 1:
The invention uses a composite laminate structure consisting of a resin layer and a metal layer (non-magnetic or ferromagnetic). This composite structure combines the formability of metal with the shape retention properties of resin, preventing spring-back while maintaining the ability to undergo drawing processes to match casing shapes.
Solution Approach 2:
The invention changes the material parameters by selecting specific resin-to-metal layer thickness ratios and using materials with appropriate mechanical properties. The anisotropy at break (Rc) is controlled to be 0 or less or 1 or more, which optimizes the balance between formability and shape retention during drawing processes.
2Object-affected harmful factors
If conventional electromagnetic wave shielding materials are used, then electromagnetic wave shielding performance is achieved, but shape retention after forming is insufficient
Solution Approach 1:
The patent applies a composite laminate of resin and metal layers that simultaneously provides electromagnetic wave shielding through the metal layer's conductivity and permeability while the resin layer contributes to shape retention by restraining spring-back forces after forming.
3Ease of manufacture
If the anisotropy at break (Rc) is not controlled, then material selection is simple, but the shape retention property deteriorates
Solution Approach 1:
The invention establishes specific parameter ranges for the anisotropy at break (Rc ≤ 0 or Rc ≥ 1) and resin-to-metal layer thickness ratios. These parameter specifications provide clear material selection criteria that balance ease of manufacture with improved shape retention, eliminating the need for complex trial-and-error material selection.
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 laminate structure improves shape retention by balancing thickness and width deformation, allowing for easier and more stable formation of electromagnetic wave shielding materials.
Implementation Method 1
a value of an anisotropy at break (Rc) represented by the following equation (1) is 0 or less or 1 or more
Data Source
AI summary
Provided is an electromagnetic wave shielding materials having an improved shape retention property. The electromagnetic wave shielding material includes a laminate with at least one non-magnetic resin layer and at least one non-magnetic metal layer and/or at least one ferromagnetic layer, wherein a value of an anisotropy at break (Rc) represented by the following equation (1) is 0 or less or 1 or more:[Equation 1]Rc=ln (WW0)ln (tt0)(1)in which:Rc is an anisotropy at break;W is a width (mm) of a ruptured portion after a tensile test of the laminate;W0 is a width (mm) of the laminate before the tensile test;t is a thickness (μm) of the ruptured portion after the tensile test of the laminate; andt0 is a thickness (μm) of the laminate before the tensile test.