Coating layer formation and liquid-phase penetration in metered size press coating

U. Forsström, E. Saharinen, R. J. Dickson, K. Fagerholm

    Research output: Contribution to journalArticleScientificpeer-review

    5 Citations (Scopus)

    Abstract

    The aim of the study was to investigate how base paper characteristics influence coating layer formation and coverage in coating paper with a metered size press. Laboratory woodfree base sheets were produced on a dynamic sheet former. The sheet properties were changed by varying softwood pulp refining and alkyl ketene dimer sizing. The base sheets were taped on a supporting mil paper and coated on a pilot metered size press at 1000 m/min. Coating layer formation was controlled by base paper permeability, which dictated coating colour penetration into the surface voids. The coating coverage was measured with a scanning electron microscope in the backscattering mode. Coating coverage was higher on the denser paper, even though the coat weight was lower. The internal/hydrophobic sizing of the fibres had no effect on the coat weight and coating coverage. The main transport mechanism was pressure-induced penetration of the coating colour into the surface voids.

    Original languageEnglish
    Pages (from-to)159-166
    Number of pages8
    JournalJournal of Pulp and Paper Science
    Volume29
    Issue number5
    Publication statusPublished - 1 May 2003
    MoE publication typeNot Eligible

    Keywords

    • Coating color
    • Covering power
    • Density
    • Layers
    • Metering equipment
    • Paper properties
    • Paper stock
    • Permeability
    • Size presses
    • Surface sizing

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