Modelling of the Plastisol Knife Over Roll Coating Process

Y. Abdesselam; Y. Demay; R. Castellani; J. F. Agassant; R. Peres; D. Gourdin

doi:10.3139/217.3422

Article

Modelling of the Plastisol Knife Over Roll Coating Process

Y. Abdesselam , Y. Demay , R. Castellani , J. F. Agassant , R. Peres and D. Gourdin

Published/Copyright: November 29, 2017

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From the journal International Polymer Processing Volume 32 Issue 5

Abstract

The knife-over-roll coating process of plastisol formulations for flooring applications has been investigated. The coexistence of smooth spherical PVC particles and rough calcium carbonate aggregates in a Newtonian plasticizer makes this suspension a more complex system than those encountered in the literature. The shear viscosity has been measured with Couette and capillary devices in the wide range of shear rates encountered in the process, resulting in a non-monotonous viscosity curve. A numerical model based on the lubrication approximation theory allows accounting for this non-monotonous behavior. It predicts the deposited thickness, the pressure field between roll and knife and the separating force as a function of the plastisol rheology and the coating parameters.

*Correspondence address, Mail address: Jean-Francois Agassant, MINES ParisTech, PSL Research University, CEMEF- Centre de Mise en Forme des Matériaux, CNRS UMR 7635, CS 10207, 06904 Sophia-Antipolis Cedex, France, E-mail: jean-francois.agassant@mines-paristech.fr

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Received: 2017-01-13

Accepted: 2017-03-01

Published Online: 2017-11-29

Published in Print: 2017-11-17

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https://doi.org/10.3139/217.3422