Flexible Shielding Material for Complex Surfaces
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Solution Overview
Problem
Conventional electromagnetic wave shielding materials lack flexibility, elasticity, and creasing/recovery capabilities, making them difficult to conform to various shapes and structures, and they often suffer from deteriorated performance due to shape changes and heat dissipation issues.
Innovation Solution
A flexible electromagnetic wave shielding material comprising a conductive fiber web with pores and a heat dissipation unit, including phase-change materials and thermally conductive fillers, which allows for shape adaptation and effective heat dissipation while maintaining electromagnetic wave shielding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal case or metal plate is used as electromagnetic wave shielding material, then electromagnetic wave shielding performance is improved, but flexibility and elasticity are deteriorated
Solution Approach 1:
The patent replaces rigid metal cases or plates with a flexible polymer film substrate that can be bent and conform to various shapes. The film has a thickness of 10 μm to 100 μm, providing flexibility while supporting the conductive coating layer for electromagnetic wave shielding.
Solution Approach 2:
The patent creates a composite structure by forming a conductive coating layer on the polymer film substrate. This composite material combines the flexibility of the polymer film with the electromagnetic wave shielding capability of the conductive coating, resolving the contradiction between shielding performance and flexibility.
2Stability of the object's composition
If the polymer film thickness is increased to improve structural stability, then electromagnetic wave shielding performance is maintained, but flexibility is deteriorated
Solution Approach 1:
The patent optimizes the film thickness parameter within a specific range (10 μm to 100 μm) to achieve the right balance between structural stability and flexibility. This parameter optimization allows the film to maintain sufficient mechanical strength while remaining flexible enough to conform to complex surfaces.
3Reliability
If the conductive coating layer is made thicker to improve electromagnetic wave shielding performance, then shielding effectiveness is improved, but crack resistance during bending is deteriorated
Solution Approach 1:
The patent uses a flexible polymer film substrate that can bend without cracking, which supports the conductive coating layer during shape changes. This flexible base prevents crack propagation in the conductive coating, maintaining both shielding performance and crack resistance.
Solution Approach 2:
The composite structure of the flexible polymer film and conductive coating layer works together to prevent cracks. The flexible substrate absorbs bending stresses, protecting the conductive coating from cracking while maintaining electromagnetic wave shielding performance.
4Reliability
If electromagnetic wave shielding material is adhered to components with stepped portions or uneven portions, then shielding coverage is improved, but adhesion quality is deteriorated due to gaps
Solution Approach 1:
The flexible polymer film can be bent and conform to complex surfaces including stepped portions and uneven portions, achieving complete contact and high-quality adhesion. The film's flexibility allows it to wrap around contours while maintaining continuous shielding coverage without gaps.
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 material exhibits excellent flexibility, elasticity, and creasing/recovery, ensuring complete contact with complex surfaces and preventing performance deterioration, while also enabling efficient heat dissipation in electronic devices with dense component layouts.
Implementation Method 1
a heat dissipation unit, including phase-change materials and thermally conductive fillers
Implementation Method 2
a heat dissipation unit, including phase-change materials and thermally conductive fillers
Implementation Method 3
shields electromagnetic waves emitted toward the electromagnetic wave shielding material by reflecting the electromagnetic waves or directing the electromagnetic waves to the ground
Data Source
AI summary
Electromagnetic wave shielding material including a conductive fiber web with multiple pores and a heat dissipation unit provided in at least some pores that is so excellent in flexibility, elasticity, and creasing/recovery that it can be changed in shape freely and brought in complete contact with a surface where the material is to be disposed even if the surface has a curved shape, uneven portions, or stepped portions, thus exhibiting excellent electromagnetic wave shielding performance and prevent deterioration thereof despite various shape changes. Since heat dissipation performance is excellent, heat generated in an electromagnetic wave source can be rapidly conducted and released. Even if parts are provided in a narrow area at high density, the material can be brought in close contact with mounted parts by overcoming a tight space between the parts and a stepped portion. The invention is employed for light, thin, short, and small or flexible devices.