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Porosity variations in coating layers - impact on back-trap mottle
Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. M Real, SE-89035 Husum, Sweden..
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
2013 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 28, no 2, p. 257-263Article in journal (Refereed) Published
Abstract [en]

A pilot coating trial was performed to study 1) whether the drying strategy introduces porosity variations in the coating layer and 2) whether porosity variations caused by the subsequent supercalendering are linked to back-trap mottle in offset prints. The porosity variations and the mean porosity were indirectly measured using a burn-out test. Coating colours were compared with three different binder systems 1) carboxy methyl cellulose (CMC)/SB-latex, 2) dextrin/SB-latex and 3) oxidized starch/SB-latex. The results showed that neither the mean porosity nor the porosity variations were affected by the drying strategies studied. During calendering the coating with the CMC/SB-latex binder system was compressed the most, but the porosity variations were nevertheless small. Both the compression and the porosity variations induced by calendering were affected by the drying strategy, which shows that the strategy had an impact on the mechanical properties of the dry coating layer. With CMC/SB-latex and dextrin/SB-latex, the mottle increased when the porosity variations introduced by the calendering increased. In the case of the oxidized starch/SB-latex, the opposite was true. It was concluded that with CMC/SB-latex and dextrin/SB-latex, print mottle is caused by calendering and with oxidized starch/SB-latex by non-uniformities introduced during dewatering and drying, possibly binder migration.

Place, publisher, year, edition, pages
2013. Vol. 28, no 2, p. 257-263
Keyword [en]
Coated papers, Porosity variations, Binders, Back trap mottle
National Category
Chemical Process Engineering
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-38671ISI: 000321291900010OAI: oai:DiVA.org:kau-38671DiVA, id: diva2:873357
Available from: 2015-11-23 Created: 2015-11-23 Last updated: 2017-08-11Bibliographically approved

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Järnström, Lars

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