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

A1 Journal article (refereed)


Internal Authors/Editors


Publication Details

List of Authors: Hanna Koivula, Martti Toivakka, Patrick Gane
Publisher: ACADEMIC PRESS INC ELSEVIER SCIENCE
Publication year: 2012
Journal: Journal of Colloid and Interface Science
Journal acronym: J COLLOID INTERF SCI
Volume number: 369
Issue number: 1
Start page: 426
End page: 434
Number of pages: 9
ISSN: 0021-9797
eISSN: 1095-7103


Abstract

Spreading of oils and water on porous and pre-saturated model carbonate coating structures 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 short times, 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. Cane, 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.


Keywords

Calcium carbonate, Imbibition, Linseed oil, Offset printing liquids, Pore surface area, Porous structure, Spreading

Last updated on 2020-02-04 at 07:25