Strip Coating Roller Pair with Adjustable Metering Gap
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Solution Overview
Problem
Existing web coating devices struggle to easily switch between one-sided and two-sided coating modes, and they face issues with anilox roller wear and coating agent dosing accuracy, especially when using abrasive substances.
Innovation Solution
A device with an adjustable metering gap and a second guide roller that can be moved vertically to immerse the web in a trough for precise coating, allowing easy switching between coating modes and reducing roller wear through adjustable gap width and smooth surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If anilox rollers are used for metering coating agent, then coating dosing is achieved, but the rollers require replacement when coating amount changes and wear is high with abrasive substances
Solution Approach 1:
The patent replaces fixed anilox rollers with a dynamic metering gap system between two smooth rollers where the gap width can be adjusted to control coating amount. This allows continuous adaptation to different coating requirements without replacing rollers, and the smooth surfaces resist wear from abrasive substances.
Solution Approach 2:
The invention changes the controlling parameter from roller surface structure (anilox grooves) to roller gap width. By adjusting the gap width between smooth rollers, the coating amount is precisely controlled without mechanical wear, extending roller service life while maintaining adaptability.
2Adaptability or versatility
If fixed coating mode is used in existing devices, then simple structure is maintained, but switching between one-sided and two-sided coating is difficult
Solution Approach 1:
The patent introduces a vertically displaceable second guide roller that can be moved between different positions to switch between one-sided coating (roller above trough) and two-sided coating (roller immersed in trough). This dynamic positioning enables mode switching without complex mechanical reconfiguration.
Solution Approach 2:
The invention adds vertical displacement freedom to the second guide roller, enabling it to move between above and below the trough level. This dimensional freedom allows the same roller to perform different coating functions without increasing horizontal structural complexity.
3Measurement precision
If coating agent is applied with traditional methods, then application is achieved, but precise dosing and layer thickness control are difficult
Solution Approach 1:
The patent replaces traditional mechanical coating methods (anilox rollers, spray systems) with a precision metering gap between smooth rollers. The gap width, controllable within 0.1 mm, directly determines coating thickness with high precision and ease of adjustment.
Data Source
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AI summary
The device has a roller pair (3) comprising drivable rollers (3a, 3b) that form an adjustable metering opening (10), where a web (1) is guided between the rollers. A guide roller (4) is arranged in front of the roller pair, and an application unit directly applies free-flowing coating medium on the web. Another guide roller (5) is movable in a vertical plane, and the application unit has a trough (6), where the rollers comprise smooth surfaces. The drivable rollers are arranged vertically on top of each other in such a manner that the web is guided horizontally between the rollers.