Effect of excess dispersant on surface properties and liquid interactions on calcium carbonate containing coatings
2010 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 25, no 1, 82-92 p.Article in journal (Refereed) Published
The aim of this work was to identify what effects excess amount of sodium polyacrylate, a commonly used dispersant, has on the coating properties and the interaction between ink and the paper coating in offset printing. Since polyacrylate strongly interacts with calcium ions, soluble calcium salt was added to some coating colours to illustrate the impact of charge neutralization by calcium ions. It was found that the coating structure was only slightly affected by the extra addition of polyacrylate, showing some weak flocculation, whereas the surface chemistry was strongly influenced. The coatings became more polar and interacted more strongly with water. This resulted in slower ink setting and reduced ink-paper coating adhesion, especially in the presence of applied water/dampening solution, which are identified as contributory factors in ink piling and print mottle.
Place, publisher, year, edition, pages
2010. Vol. 25, no 1, 82-92 p.
Coating, Sodium polyacrylate, Hygroscopy, Offset, Ink-paper coating interaction, Coating structure, Surface energy, Ink adhesion
Paper, Pulp and Fiber Technology
IdentifiersURN: urn:nbn:se:kth:diva-27570DOI: 10.3183/NPPRJ-2010-25-01-p082-092ISI: 000278043500011ScopusID: 2-s2.0-78650715032OAI: oai:DiVA.org:kth-27570DiVA: diva2:377893
QC 201012152010-12-152010-12-132016-10-19Bibliographically approved