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    Temperature and moisture effects on wetting of calcite surfaces by offset ink constituents

    Year: 2011

    Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects 2011, 390 (1-3) pp 105-111, 20121211

    Authors: Hanna Koivula, Hajer Kamal Alm, Martti Toivakka

    Organizations: Laboratory of Paper Coating and Converting, Center for Functional Materials, Åbo Akademi University, Porthaninkatu 3, 20500 Åbo/Turku, Finland, Innventia AB, Drottning Kristinas väg 61, 114 28 Stockholm, Sweden

    Offset printability is influenced by interactions between inkconstituents: linseed oil, mineral oil and water (fountain solution), with the mineral surfaces of paper coatings. To exclude complications of the porous structure effects, the influence of temperature and moisture on wetting by offsetink model liquids were studied on cleaved optical calcitesurfaces with and without sodium polyacrylate dispersant. Contact angle measurement was chosen as the method of analysis. The results show that a moderate temperature increase from 25 °C to 60 °C, which might occur in the process, does not affect the wetting of these surfaces by mineral oil. Water and linseed oil are affected by the transport of moisture at the surfaces as an indirect consequence of temperature increase. The linseed oil behavior was found to be sensitive to polarity changes of the surfaces.