Filter structure
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Solution Overview
Problem
Existing filter structures face issues with maintaining adhesive force due to sheet layer waving or separation from the adhesive layer, leading to reduced contact area and increased surface roughness, which affects attachment and handling.
Innovation Solution
A filter structure with a sheet layer thickness of 12 μm to 75 μm and surface arithmetic average roughness of 0.09 μm to 0.4 μm, which reduces waving and allows for easy deformation, protecting the adhesive layer and maintaining smoothness for effective adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sheet layer thickness is small, then the filter structure can be folded and packed easily, but the sheet layer becomes waved and the adhesive surface smoothness is reduced
Solution Approach 1:
The patent optimizes the sheet layer thickness to a specific range (12-75 μm) to balance flexibility for folding with structural stability. This parameter optimization prevents waving while maintaining foldability, resolving the contradiction between ease of operation and manufacturing precision.
2Strength
If the sheet layer thickness is large, then the sheet layer has strong bending strength, but the sheet layer separates from the adhesive layer during folding
Solution Approach 1:
The patent specifies a maximum sheet layer thickness of 75 μm to prevent excessive bending strength that would cause separation from the adhesive layer during folding. This parameter control ensures the sheet layer remains reliably bonded while maintaining sufficient strength.
3Ease of operation
If the sheet layer surface roughness is large, then the sheet layer has good handling properties, but the adhesive layer surface roughness increases and adhesive force decreases
Solution Approach 1:
The patent optimizes the sheet layer surface arithmetic average roughness Ra to the range of 0.09-0.4 μm. This parameter optimization balances handling properties with adhesive performance, ensuring sufficient ease of operation while maintaining strong adhesive force through appropriate surface smoothness.
Data Source
AI summary
A filter structure (F) includes a filter layer (1), an adhesive layer (10), and a sheet layer (20). The sheet layer has a thickness of 12 μm to 75 μm, and has a surface roughness Ra of 0.09 μm to 0.4 μm on a surface in contact with the adhesive layer. By setting the thickness of the sheet layer to 12 μm or more, waving when the sheet layer is laminated on the adhesive layer is reduced, and surface smoothness of the adhesive layer is maintained. By setting the thickness of the sheet layer to 75 μm or less, the sheet layer is less likely to be separated from the adhesive layer during folding. Since the surface roughness Ra of the sheet layer is 0.4 μm or less, a surface roughness of the adhesive layer in contact with the sheet layer is controlled to a state of reliably exerting an adhesive force. Since the surface roughness of the sheet layer is 0.09 μm or more, handleability is improved, and a manufacturing cost is not increased.