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    Short time spreading and wetting of offset printing liquids on model calcium carbonate coating structures

    Year: 2011

    Journal: Journal of Colloid and Interface Science 2012, 369 (1) pp 426-434, 20121211

    Authors: Hanna Koivula, Martti Toivakka, Patrick Gane

    Organizations: Center for Functional Materials, Abo Akademi University, Department of Chemical Engineering, Laboratory of Paper Coating and Converting, Porthansgatan 3, FIN-20500 Abo/Turku, Finland, Aalto University, School of Science and Technology, Faculty of Chemistry and Materials Science, Department of Forest Products Technology, Tekniikantie 3, FIN-02150 Espoo, Finland, Omya Development AG, Baslerstrasse 42, PO Box 32, CH-4665 Oftringen, Switzerland

    Spreading of oils and water on porous and pre-saturated modelcarbonatecoatingstructures was studied with high speed video imaging. The short-time data were complemented with long time absorption and wicking experiments. The results indicate a strong dependence between surface structural features of the pigment tablets and water spreading at shorttimes, both in non-saturated and water pre-saturated cases, while the oil spreading is mainly dependent on the liquid properties. Sodium polyacrylate dispersant on pigment surfaces is shown to contribute to water spreading and absorption. On pre-saturated structures the liquid-liquid interactions are dominant and the majority of results support spreading according to the molecular kinetic model. The evidence supports the hypothesis of S. Rousu, P. Gane, and D. Eklund, [“Influence of coating pigment chemistry and morphology on the chromatographic separation of offset ink constituents,” in The Science of Papermaking Transactions of the 12th Fundamental Research Symposium, FRC The Pulp & Paper Fundamental Research Society, Oxford, UK, 2001, p. 1115] that at long times the oils absorb into the porous structure at a rate proportional to the ratio of viscosity and surface tension, provided there is no sorptive action with the binder. A combination of nanosized pores and large surface area is useful for providing sufficient absorption capability for carbonate based coatings.