Leveling of surface defects in thin films of pigmented coatings

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Toivakka M, Kokko A, Salminen P, Urscheler R, Bousfield DW
Publisher: ARBOR PUBLISHING AB
Publication year: 2001
Journal: Nordic Pulp and Paper Research Journal
Journal acronym: NORD PULP PAP RES J
Volume number: 16
Issue number: 3
Start page: 246
End page: 250
Number of pages: 5
ISSN: 0283-2631


Abstract

Leveling of surface irregularities in thin films of pigmented coatings was investigated. Artificially induced defects in a pilot scale coater trial were analyzed using a high-speed video camera, surface profilometry and optical microscopy. The influence of the defect geometry, rheological properties of the pigment suspension, substrate properties and process conditions was studied. The leveling rate of the defects was found to depend on both the elasticity and the viscous resistance of the coating suspension. Numerical simulations suggested that final dry widths of the defects were determined by immobilization of the uniform coating layer next to the defects.


Keywords

blade scratches, coating colors, coating defects, leveling, rheology, viscoelasticity

Last updated on 2019-08-12 at 03:07

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