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New approach to the analysis of ribbing in coil coating

Abstract : The deformable roll coating is used in the coil coating industry. The aim is to apply a liquid film on a moving substrate. During application a defect appears. This defect is called “ribbing” and is characterized by periodic ribs parallel to the moving direction of the substrate. The wet thickness applied on the strip is adjusted by different gaps between rolls. The applied speeds and loads on the rolls modify the film thickness and film stability. The elastomeric roll cover is used to permit thinner film application and to delay the onset of ribbing. In this work, the flow in a deformable contact is presented for a negative gap mode. The aim of the study is an optimisation of the application in real industrial conditions by a good mastering of the contact parameters at the strip / roll cover interface. Compared to previous published studies, the presented work will take into account the elastomer cover behaviour used in industrial environments. A specific cyclic compression test is developed to analyse the elastomer behaviour as a function of representative solicitation and chemical environment. A modification of the Young Modulus and relaxation time of the elastomer is observed for different environments. A Prony series is identified with this test results and will be used in the numerical modelling. The finite element simulation of the process is proposed through a solid-fluid interaction. The solid part of the model predicts the mechanical pressure and the fluid part gets the associated wet thickness and free surface position. Moreover, an experimental investigation is performed to correlate the numerical result and the industrial process.
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  • HAL Id : tel-03001662, version 1

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Eddy Szczurek. New approach to the analysis of ribbing in coil coating. Mechanical engineering [physics.class-ph]. Université de Valenciennes et du Hainaut-Cambrésis, UVHC, (France), 2007. English. ⟨NNT : 2007VALE0012⟩. ⟨tel-03001662⟩

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