Rotating Cam Die Coating for Complex Shapes
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Solution Overview
Problem
Existing die coating systems face challenges in producing uniform coatings due to start and stop issues and width changes, leading to non-uniform coatings and waste, especially when coating complex shapes like circular, oval, or ring shapes, which have low nesting efficiency and are costly.
Innovation Solution
A die coating apparatus with a rotatable cam inside a die body, featuring recessed areas on its peripheral surface that intersect with the dispensing opening to form fluid connection regions, allowing dynamic adjustment of the coating width or shape by rotating the cam, thereby enabling programmatically variable discrete shapes with minimal waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional die coating systems are used with stable die geometry, then coating uniformity is maintained, but the system cannot dynamically adjust coating width or shape for complex geometries
Solution Approach 1:
The patent applies the dynamics principle by replacing the static die geometry with a rotatable cam mechanism inside the die body. The cam can rotate to dynamically adjust the coating width and shape during operation, allowing the system to adapt to different coating requirements while maintaining control over coating uniformity through programmed rotation positions.
Solution Approach 2:
The patent implements parameter changes by modifying the effective dispensing opening width through cam rotation. As the cam rotates, the recessed areas align differently with the dispensing opening, changing the fluid connection region and thus the coating width parameter without altering the physical die structure.
2Productivity
If continuous coating is used followed by converting process, then production efficiency is maintained, but material waste increases due to non-reusable weed
Solution Approach 1:
The patent applies preliminary action by directly forming the final discrete shape during the coating process itself, rather than coating a continuous web and then cutting it into shapes. The cam mechanism pre-defines the exact coating pattern needed, eliminating the subsequent converting process and associated waste.
Solution Approach 2:
The patent extracts the converting process from the production flow by implementing direct die coating of discrete shapes. This removes the unnecessary step of creating continuous coating followed by cutting, thereby eliminating the waste material (weed) generated in the converting process.
3Manufacturing precision
If die geometry is made highly accurate and stable, then coating uniformity is achieved, but the system lacks flexibility for programmatically variable shapes
Solution Approach 1:
The patent resolves this contradiction by introducing a dynamic cam mechanism that can rotate to different programmed positions. Each position corresponds to a specific coating shape or width, allowing the system to maintain precise control (through stable die geometry) while achieving flexibility (through cam rotation) for various discrete shapes.
Data Source
AI summary
Coating apparatuses and methods are provided for direct coatings with various shapes. The coating apparatus includes a die body with one or more bores. One or more cams are pivotally mounted within the bores and have one or more recessed areas formed into the respective peripheral surfaces thereof. The one or more cams are rotatable within the die body to dynamically, independently vary the width or shape of the respectively dispensed one or more fluid coatings.