Catalyst-Coated Membrane Separation With Edge Lift Suppression
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Solution Overview
Problem
The electrolyte membrane in catalyst-coated membranes for polymer electrolyte fuel cells tends to lift from the suction roller during separation due to insufficient suction force, particularly near the edges, causing wrinkles and affecting the application of catalyst ink.
Innovation Solution
The apparatus employs gas blowing to press the electrolyte membrane against the suction roller, especially at the edges where suction is weak, and controls the gas flow to minimize interference with the catalyst supply, using a controlled gas supply system and rotation speed management to enhance separation and reduce coating disturbances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the suction force is increased to prevent membrane lift, then the membrane adhesion to suction roller is improved, but the catalyst supply is disturbed due to gas flow interference
Solution Approach 1:
The suction roller surface is divided into multiple suction ports with different suction forces. The edge regions have stronger suction ports while the central region has weaker suction ports, allowing differential control of membrane adhesion in different areas to prevent lift without disturbing catalyst supply
Solution Approach 2:
Different regions of the suction roller are given different suction characteristics. The edge regions receive enhanced suction force to prevent membrane lift, while the central region maintains normal suction to avoid interfering with catalyst ink application
2Reliability
If gas blowing is applied to suppress membrane lift, then the membrane adhesion is improved, but the catalyst supply is disturbed due to gas flow interference
Solution Approach 1:
The gas blowing system is segmented into multiple nozzles positioned at different locations. Gas is blown selectively at the edge regions where lift occurs, while avoiding the central region where catalyst supply takes place, thus preventing membrane lift without disturbing catalyst application
Solution Approach 2:
The gas flow acts as an intermediary force to press the membrane against the suction roller surface. By carefully controlling the gas flow direction and position, the membrane is secured without the gas directly interfering with the catalyst ink deposition process
3Reliability
If the suction force is increased to prevent membrane lift, then the membrane adhesion is improved, but the gas flow increases causing catalyst supply disturbance
Solution Approach 1:
The suction roller is equipped with multiple suction ports distributed across different regions. By activating only the edge suction ports with higher force and keeping central ports at lower force, the system prevents membrane lift without generating excessive overall gas flow that would disturb catalyst supply
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
This method effectively suppresses membrane lift during separation, ensuring uniform catalyst application and reducing coating failures, thereby improving the manufacturing process efficiency and quality of catalyst-coated membranes.
Implementation Method 1
the electrolyte membrane is initially held on a suction roller under suction
Implementation Method 2
a gas supply part that blows gas onto the electrolyte membrane held on the outer peripheral surface of the suction roller
Implementation Method 3
a catalyst supply part that supplies catalyst ink to the outside surface of the electrolyte membrane held on the suction roller
Data Source
Figure 1
Figure 2
Figure 3
AI summary
After passing through a gap (15) defined between a suction roller (20) and a separation roller (11), an electrolyte membrane (92) is held on the suction roller (20) under suction, and a base material (91) is transported away from the outer peripheral surface of the suction roller (20). Thus, the base material (91) is separated from the electrolyte membrane (92). At this time, a gas is blown toward a plurality of ejection regions lying on the outside surface of the electrolyte membrane (92). The ejection regions are discontinuous in the width direction of the electrolyte membrane (92) and include opposite edges of the electrolyte membrane (92) as seen in the width direction. This suppresses the lift of the electrolyte membrane (92) on the opposite edges of the electrolyte membrane (92) as seen in the width direction where the force of suction is poor. The ejected gas passes through spaces defined between the ejection regions. This reduces the amount of gas flowing toward a catalyst supply part.