Ion Exchange Membrane Roll Winding to Prevent Blocking on Unwinding
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Solution Overview
Problem
Existing methods for producing ion exchange membrane rolls face challenges in maintaining production efficiency due to issues such as blocking and weaving during unwinding, which are caused by adhesion between layers of the ion exchange membrane in a dry condition.
Innovation Solution
The solution involves setting the air layer proportion in the ion exchange membrane roll to be between 5% and 50% and winding the membrane around a core at a specific tension and speed without applying pressure, ensuring the membrane remains in a dry condition to prevent adhesion and maintain shape stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the ion exchange membrane is wound in a dry condition with high layer adhesion, then the roll structure is compact, but blocking and weaving occur during unwinding
Solution Approach 1:
The invention changes the physical state parameter of the ion exchange membrane from dry to wet condition during winding. By controlling the humidity parameter (maintaining 20-80% relative humidity), the membrane layers maintain appropriate adhesion to form a compact roll structure while preventing excessive adhesion that would cause blocking during unwinding.
2Productivity
If the ion exchange membrane is wound with high tension to improve production efficiency, then the winding speed increases, but the membrane shape stability deteriorates
Solution Approach 1:
The invention changes the environmental parameter from dry condition to controlled humidity condition (20-80% relative humidity). This parameter change allows the membrane to be wound at higher tensions and speeds while maintaining shape stability, as the moisture prevents excessive deformation and adhesion during the winding process.
3Ease of operation
If the air layer proportion is increased to prevent adhesion, then blocking and weaving are reduced, but production efficiency decreases
Solution Approach 1:
The invention changes the environmental parameter from dry condition to controlled humidity condition (20-80% relative humidity). This allows the membrane to be wound with appropriate air layer proportion while maintaining smooth unwinding, as the moisture controls adhesion between layers without requiring excessive air gaps.
Data Source
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AI summary
Provided are an ion exchange membrane roll with high production efficiency, and an ion exchange sheet producing method. According to the embodiments, the ion exchange membrane roll is provided. The ion exchange membrane roll is a roll of a planar ion exchange membrane in a dry condition. The ion exchange membrane has a first side and a second side. The second side is orthogonal to the first side, and has a length equal to or shorter than that of the first side. In the ion exchange membrane roll, the ion exchange membrane is wound around a winding shaft in the direction parallel to the second side. The air layer proportion of the ion exchange membrane roll is more than 5% and at most 50%.