Slot Die Coater Guide Lips for Uniform Electrode Coating Width
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Solution Overview
Problem
Existing slot die coaters face issues where the width of the discharged coating material expands beyond the slot opening due to discharge pressure and atmospheric pressure, and the width becomes uneven due to pulsation of discharge pressure.
Innovation Solution
A slot die coater design featuring a pair of guide lips protruding from both ends of the slot opening, which come into contact with the coating material to prevent expansion and guide its movement, along with a shim plate and die lip configuration to maintain precise coating width and prevent leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pressure is applied to discharge coating material through a slot opening, then the coating material is discharged onto the substrate, but the width of the discharged coating material expands beyond the width of the slot opening due to discharge pressure and atmospheric pressure
Solution Approach 1:
The patent introduces guide lips as intermediary structures that protrude from the slot opening to contact and guide the coating material. These guide lips act as mediators between the discharge pressure and the coating material width, preventing expansion while maintaining efficient discharge. The guide lips transfer the controlling function from the slot geometry alone to a combined system of slot plus guide lips.
2Productivity
If pressure is applied to discharge coating material through the slot, then the coating material flows onto the substrate, but the width becomes uneven due to pulsation of discharge pressure
Solution Approach 1:
The guide lips serve as stabilizing intermediaries that dampen the effect of pressure pulsations on coating width. By providing a physical boundary that contacts the coating material edges, the guide lips decouple the discharge pressure fluctuations from the final coating width, ensuring uniformity despite variable discharge rates.
3Manufacturing precision
If the slot opening width is reduced to control coating material width, then the coating precision improves, but the discharge efficiency decreases due to higher resistance
Solution Approach 1:
The patent segments the width control function from the discharge function. The slot opening maintains a width optimized for discharge efficiency, while the guide lips provide the width control function. This segmentation allows each component to be optimized independently - the slot for flow efficiency and the guide lips for precision control.
4Manufacturing precision
If guide lips are added to control coating material width, then the coating precision improves, but the device complexity increases
Solution Approach 1:
The guide lips are merged with the existing slot die structure rather than being separate components. By integrating the width control function into the die body itself, the patent achieves precision control without adding independent subsystems, thereby minimizing the increase in device complexity.
Data Source
AI summary
A slot die coater is configured to discharge a coating material onto a surface of a substrate, and may include: a first die having a first surface; a second die having a second surface facing the first surface; and a shim plate interposed between the first surface of the first die and the second surface of the second die to form a slot through which the coating material is discharged. The second die may include a pair of guide lips protruding from both ends of the opening of the slot toward the substrate. An electrode coating device including the slot die coater is configured to coat an electrode substrate using the slot die coater.