Magnetic Sheet Drying Control for Balanced Surface Adhesion
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Solution Overview
Problem
Existing magnetic sheet production methods result in uneven resin distribution, leading to excessive adhesion on one surface and reduced adhesion on the other, failing to achieve balanced adhesiveness on both principal surfaces.
Innovation Solution
A magnetic sheet with a controlled ratio of carbon and oxygen, between 10 mass % and 60 mass %, on both principal surfaces, achieved through specific production methods that include blending magnetic particles and resin with an organic solvent, applying the mixture, and drying it using controlled heating techniques to maintain balanced resin distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the magnetic composition solution is applied on a separator and dried using conventional heating methods, then the magnetic sheet is produced efficiently, but the resin excessively concentrates on the front surface and excessively decreases on the rear surface, leading to unbalanced adhesion
Solution Approach 1:
The invention changes the heating parameters by controlling the temperature distribution during drying, specifically maintaining the temperature at 80°C or lower to prevent excessive resin concentration on the front surface while ensuring sufficient drying on the rear surface, thus achieving balanced resin distribution and adhesion
Solution Approach 2:
The invention introduces dynamic control of the drying process by adjusting heating conditions based on the thickness and composition of the magnetic sheet, allowing the resin distribution to be optimized during the drying process to achieve uniform adhesion on both surfaces
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 ensures both principal surfaces of the magnetic sheet exhibit excellent adhesiveness, preventing excessive resin segregation and maintaining cohesion, thereby improving overall adhesion and magnetic properties.
Implementation Method 1
The magnetic particles and resin are dispersed in an organic solvent, thereby preparing a magnetic composition solution (varnish). The magnetic composition solution is applied on a separator, dried, and thereafter heated.
Implementation Method 2
The magnetic composition solution is applied on a separator, dried, and thereafter heated.
Data Source
AI summary
A magnetic sheet has a first principal surface and a second principal surface facing each other in the thickness direction. The magnetic sheet contains magnetic particles and resin. The ratio of the total amount of carbon and oxygen on one of the first principal surface and second principal surface is 10 mass % or more and 60 mass % or less.