Influence of surface chemical composition on UV-varnish absorption into permeable pigment-coated paper

Maiju Pykönen, Kenth Johansson, Roger Bollström, Pedro Fardim, Martti Toivakka

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    Fluorocarbon, organosilicon, and hydrocarbon plasma coatings were used to modify the surface permeable pigment-coated paper, and their impact on UV-varnish absorption was investigated. According to mercury porosimetry results, the plasma coatings had no influence on the porous structure of the paper. X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS) results showed characteristic surface chemical compositions for each plasma coating. The fluorocarbon plasma coating increased the UV-varnish contact angles significantly, whereas the hydrocarbon plasma coating had no clear influence. When the UV varnish was applied with a flexography unit including nip pressure, the role of surface chemical composition seemed to become minimal. The viscosity of the UV varnish was shown to impact the absorption rate with and without external pressure.
    Original languageUndefined/Unknown
    Pages (from-to)2169–2175
    Number of pages7
    JournalIndustrial & Engineering Chemistry Research
    Issue number5
    Publication statusPublished - 2010
    MoE publication typeA1 Journal article-refereed

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