Multi-Slot Die Coater Step Block for Uniform Coating Gaps
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Solution Overview
Problem
Conventional multi-slot die coaters face challenges in maintaining uniform coating gaps, leading to non-uniform electrode layer thickness and increased production time, especially when dealing with wide current collectors and varying active material slurries, due to structural vulnerabilities and the need for frequent adjustments.
Innovation Solution
A multi-slot die coater configuration featuring a lower, intermediate, and upper die block with a fixing block that includes a step portion for precise coupling, allowing for consistent coating gap maintenance and reducing the need for frequent disassembly and reassembly, thereby stabilizing the coating gap and preventing deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the coating gap is not precisely controlled in conventional multi-slot die coaters, then the device can operate with simpler structure, but the coating quality becomes non-uniform and electrode layer thickness varies
Solution Approach 1:
The fixing block is designed with a step portion that preliminarily establishes the correct positioning relationship between die blocks before final tightening. This preliminary action ensures uniform coating gap without requiring complex adjustment mechanisms during operation.
Solution Approach 2:
The fixing block acts as an intermediary component between die blocks, using its step portion to mediate the positioning and maintain uniform coating gap. This intermediary structure simplifies the overall coupling system while ensuring precision.
2Manufacturing precision
If conventional multi-slot die coaters use frequent adjustments to maintain coating gap, then coating quality can be maintained, but production time increases and productivity decreases
Solution Approach 1:
The die block coupling structure transitions from a static assembly requiring frequent adjustments to a dynamic system where the fixing block with step portion automatically maintains positioning. This allows the coating gap to remain consistent during high-speed operation without interruptions for adjustment.
Solution Approach 2:
The fixing block with step portion creates a self-positioning system that automatically maintains uniform coating gap without requiring external intervention or frequent adjustments during production, thereby maintaining both precision and high productivity.
3Device complexity
If conventional die coaters use simple coupling structures, then device complexity is reduced, but widthwise coating gap deviation increases on wide current collectors
Solution Approach 1:
The coupling structure is segmented into multiple fixing blocks distributed across the width of the die assembly. Each fixing block with its step portion independently maintains positioning at its location, ensuring uniform coating gap across the entire width without requiring an overly complex integrated structure.
4Productivity
If multi-slot die coaters are designed for high-speed coating, then productivity increases, but coating gap stability decreases and deviations occur
Solution Approach 1:
The step portion of the fixing block preliminarily establishes and locks the correct positioning of die blocks before high-speed coating begins. This preliminary positioning action ensures that even during high-speed operation, the coating gap remains stable and deviations are prevented.
Data Source
AI summary
There is provided a multi-slot die coater in which a step is formed between rear surfaces of die blocks through a fixing block having a step portion. The fixing block has the step portion of a preset height, and any one die block is coupled to the step portion and the other die block is coupled to the other portion than the step portion, and thus the step is naturally formed between the rear surfaces of the die blocks by the coupling of the die blocks to the fixing block. Thus, it is possible to always maintain the distance of the front ends of the die blocks and the substrate, since the fixing block is fixed between the die blocks, once it is set, the coating gap does not change and is maintained during the process, thereby suppressing the widthwise coating gap deviation.