Leveling of surface defects in thin films of pigmented coatings

Martti Toivakka, A Kokko, P Salminen, R Urscheler, DW Bousfield

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    8 Citations (Scopus)


    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.
    Original languageUndefined/Unknown
    Pages (from-to)246–250
    Number of pages5
    JournalNordic Pulp and Paper Research Journal
    Issue number3
    Publication statusPublished - 2001
    MoE publication typeA1 Journal article-refereed


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

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