Rolling Mill Cladding Wettability for Strip Contamination Control
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Solution Overview
Problem
Rolling mills face significant soiling issues due to metallic abrasion and rolling oil, leading to contamination of the rolled product and increased cleaning efforts, which result in production losses and downtime, especially when producing metallic foils for food packaging.
Innovation Solution
The surfaces of the rolling mill's cladding and hood elements are designed with oleophilic and oleophobic finishes, where overlapping areas with the strip running zone have an oleophilic surface finish to suppress droplet formation and non-overlapping areas have an oleophobic surface finish to promote self-cleaning, utilizing contact angles to differentiate wetting abilities and facilitate efficient cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional surfaces are used on cladding and hood elements, then droplet formation occurs leading to contamination risk, but cleaning frequency must be increased which causes production downtime
Solution Approach 1:
The patent applies different surface wettability properties to different locations on cladding and hood elements. Overlapping surfaces that contact the strip running zone are made oleophilic to suppress droplet formation and prevent contamination, while non-overlapping surfaces are made oleophobic to promote droplet formation for easy cleaning. This local differentiation resolves the contradiction by preventing contamination where it matters most while enabling easy maintenance elsewhere.
2Ease of operation
If oleophobic surfaces are used on all surfaces, then self-cleaning effect is achieved, but droplet detachment and contamination risk increase
Solution Approach 1:
The patent strategically places oleophobic surfaces only on non-overlapping areas of cladding and hood elements that do not contact the strip running zone. These surfaces promote droplet formation and runoff for self-cleaning without creating contamination risk. The overlapping surfaces contact the strip zone are made oleophilic to suppress droplet formation. This local quality differentiation resolves the contradiction between self-cleaning capability and contamination prevention.
3Reliability
If oleophilic surfaces are used on all surfaces, then droplet formation is suppressed, but cleaning becomes difficult and frequent disassembly is required
Solution Approach 1:
The patent applies oleophilic surface treatment only to overlapping surfaces of cladding and hood elements that are in contact with the strip running zone, where contamination prevention is critical. Non-overlapping surfaces are treated with oleophobic properties to promote droplet formation and facilitate easy cleaning without requiring disassembly. This localized approach resolves the contradiction between contamination prevention and cleaning accessibility.
4Ease of manufacture
If uniform surface treatment is applied, then manufacturing is simplified, but both contamination prevention and cleaning efficiency cannot be optimized simultaneously
Solution Approach 1:
The patent differentiates surface treatment by location: overlapping surfaces contact the strip zone receive oleophilic treatment to suppress droplet formation and prevent contamination, while non-overlapping surfaces receive oleophobic treatment to promote self-cleaning. This local quality differentiation optimizes both contamination control and cleaning efficiency, resolving the contradiction with uniform treatment approaches.
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 design reduces the risk of contamination by preventing droplet detachment and facilitates extended cleaning intervals for critical areas, while allowing easy cleaning of non-critical areas through droplet formation and directed drainage, thereby minimizing downtime and production losses.
Implementation Method 1
overlapping surfaces have an oleophilic surface quality... oleophilic surfaces, which counteract the formation of liquid droplets due to their good wettability, suppress droplet formation
Implementation Method 2
cladding elements and hood elements whose surfaces form at least partially non-overlapping surfaces that are not arranged in contact with the strip running zone have an oleophobic surface quality... promote the formation of liquid droplets, resulting in a self-cleaning effect as the droplets run off the surfaces
Data Source
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AI summary
Rolling mill (10) for rolling metal strips with a rolling stand (16) and a rolling stand cladding, which is arranged at least partially above a strip running zone (29) arranged in a strip running plane (15), wherein the strip running plane (15) is defined by a roll gap (19) formed between work rolls (17, 18) of the rolling stand (16), with an extraction device comprising a hood device, wherein the wettability of the surfaces of the rolling stand cladding and the hood device is at least partially different, such that on a plurality of cladding elements and hood elements which are arranged in overlap with the strip running zone (29) and above the strip running plane (15), overlapping surfaces facing the strip running zone (29) are formed which form an oleophilic surface, and on cladding elements and hood elements which are not arranged in overlap with the strip running zone (29),Non-covering surfaces are formed, which create an oleophobic surface.