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Impact of non-uniform water absorption on water-interference print mottle in offset printing
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences (from 2013). RISE Bioeconomy.
RISE Bioeconomy.
OmyaInternationalAG, Switzerland; Aalto University, Finland.
2018 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 33, no 1, p. 150-163Article in journal (Refereed) Published
Abstract [en]

Print mottle is a serious and yet common print defect in offset printing. An imbalance between the feed of fountain solution and the ability of the paper substrate to absorb and transport this water away from the surface can cause moisture/water interference problems. In the study presented here, we have investigated the uniformity of aqueous absorption and coating structure of pilot-coated papers with different types and dosages of dispersants and linked this to print mottle and uncovered areas (UCA). In earlier studies, the print quality of these papers indicated that a moderate addition of excess dispersant caused ink refusal, ink-lift-off (ink-surface adhesion failure) and water-interference mottle when printing at elevated fountain feed. In the present study, we have shown that a majority of the samples with uneven water/moisture absorption and an uneven burn-out reflectance tended to have more severe printing problems related to surface-moisture/water.An aqueous staining technique was used to characterise the absorption non-uniformities. This method has been developed previously with focus on absorption of flexographic water-based inks but can clearly give relevant information also for offset printing, when it comes to moisture/water interference mottle.

Place, publisher, year, edition, pages
De Gruyter Open, 2018. Vol. 33, no 1, p. 150-163
Keywords [en]
absorption non-uniformity, coated paper, dispersant, offset printing, uncovered area, water-interference mottle, Fountains, Moisture, Dispersants, Non-uniformities, UnCovered Areas, Water interference mottles, Water absorption
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-68066DOI: 10.1515/npprj-2018-3011Scopus ID: 2-s2.0-85047988264OAI: oai:DiVA.org:kau-68066DiVA, id: diva2:1223983
Available from: 2018-06-26 Created: 2018-06-26 Last updated: 2018-06-27Bibliographically approved

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Thorman, Sofia

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