Rolled Graphite Sheet Winding Stability
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Solution Overview
Problem
Rolled graphite sheets experience unevenness and slippage when subjected to directional changes or vibrations due to their smooth surface, leading to potential cracking and handling issues.
Innovation Solution
A rolled graphite sheet design featuring a high-tension winding process with a rod-shaped core, where the graphite sheet is wound with a tension of 0.5 N/cm or more, and optionally covered with a protective film and heat-shrinkable film to minimize sheet shifting and edge unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a long graphite sheet is wound around a core member to form a roll, then the graphite sheet can be transported and stored efficiently, but the smooth surface of the graphite sheet causes slippage between layers when the roll is subjected to directional changes or vibrations
Solution Approach 1:
A release film is introduced as an intermediary layer between the graphite sheet and the outer environment. This film has controlled adhesion properties that prevent slippage between graphite sheet layers during transportation and handling, while allowing easy separation when the graphite sheet needs to be used. The release film acts as a mediator that resolves the contradiction between maintaining sheet stability during transport and enabling easy sheet separation for application.
2Volume of stationary object
If the graphite sheet layers are stacked tightly to reduce roll size, then storage space is optimized, but slippage between layers increases due to the smooth surface
Solution Approach 1:
The release film serves as a mediator between the graphite sheet layers, providing controlled adhesion that prevents slippage even when layers are tightly stacked for compact storage. The film allows the layers to remain stable in their stacked configuration while maintaining the ability to be separated when needed.
Solution Approach 2:
The adhesion parameters of the release film are specifically controlled to provide optimal balance between preventing slippage during storage and allowing easy separation for use. By adjusting the adhesion strength of the release film, the system achieves both compact storage and easy sheet removal.
3Temperature
If the graphite sheet is made thinner to improve thermal conductivity efficiency, then the material becomes more prone to cracking when impact is applied to the roll end faces
Solution Approach 1:
The release film provides a cushioning effect that distributes impact forces applied to the roll end faces, preventing stress concentration that would cause cracking in thin graphite sheets. This protective layer absorbs and disperses mechanical shocks before they reach the fragile graphite material, enabling the use of thinner, more thermally efficient sheets without compromising their mechanical strength.
Data Source
AI summary
A rolled graphite sheet includes a rod-shaped body and a graphite sheet having a length of 1 m or more and a width shorter than the length. The graphite sheet is wound around the rod-shaped body and is rolled in a length direction. When a length direction-end of the graphite sheet is pulled with a force of 1.5 N/cm in a direction parallel to a tangent of a cross-sectional circle of the rolled graphite sheet while fixing the rod-shaped body, the end moves 5 mm or less in the direction parallel to the tangent of the circle.