The interfacial slippage of paper during blade metering

A4 Conference proceedings


Internal Authors/Editors


Publication Details

List of Authors: Alam P, Toivakka M
Publication year: 2005
Book title: Proceedings: European Coating Symposium 2005


Abstract

Numerical methods were used to model fluid-solid interactions during blade metering applications. Paper attached to an elastomeric backing roll was used to drive Newtonian coating colours up to speeds of 20ms$^{-1}$ under either steel or composite polymeric-steel metering blades. Parameters such as the coating viscosity, coating thickness and paper web speed were all found to influence the magnitude of paper slip and separation at the backing roll interface. The use of thin steel blades was found to lessen separation of paper relative to the thicker composite polymeric-steel blades and this is related to the increased slip as a function of distance leading to increased buckling. Interfacial slippage of paper from the backing roll is found to be linearly proportional to interfacial separation. In conclusion, the interfacial slip that occurs between the paper and the backing roll is related to an amalgamation of events that primarily comprise the coating pressure under the blade, the value of the coefficient of static friction and the mechanical properties of the backing roll material. The interfacial slip and separation are thus also implicitly related to the coating properties such as the viscosity, thickness and velocity since this affects the magnitude of the pressure pulsation under the metering blade.

Last updated on 2019-23-09 at 03:08