Levelling of coating suspensions

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Toivakka MO, Bousfield DW
Publisher: PULP & PAPER TECHNICAL ASSOCIATION CANADA
Publication year: 1999
Journal: Journal of Pulp and Paper Science
Journal acronym: J PULP PAP SCI
Volume number: 25
Issue number: 5
Start page: 183
End page: 188
Number of pages: 6
ISSN: 0826-6220


Abstract

Surface tension driven levelling of coating suspensions is studied using a mathematical model based on traditional computational fluid dynamics and dynamic simulation of particle motion. Microscopic mechanisms and parameters that control the levelling of suspensions are investigated. High particle concentrations and flocculated state of the suspension reduce the levelling flow in thin films. Nonhydrodynamic forces determine the microstructure of the coating layer: repulsive interparticle forces lead to layered structures and promote levelling, whereas attractive forces create flocs that reduce the levelling. The reduction of levelling caused by various microstructures can lead to a nonuniform coating distribution along the coated substrate.

Last updated on 2019-09-12 at 02:49