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Uniformity of liquid absorption by coatings: Technique and impact of coating composition
RISE, Innventia.ORCID iD: 0000-0002-0866-1087
RISE, Innventia.
RISE, Innventia.
RISE, Innventia.
2012 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 27, no 2, p. 459-465Article in journal (Refereed) Published
Abstract [en]

The interaction between a liquid and a paper surface is important for a number of paper treatment processes, where absorption is of special significance during printing. Many absorption measurement techniques use a large available volume of liquid to characterise absorption, when compared to the volume of the coating. The uniformity of the absorption is also seldom characterised. We have developed a new technique, which is presented in this article, to study the uniformity of absorption of a small amount of liquid. This technique is based on the short-time absorption (tenth of a second) of a coloured liquid, the blotting of excess liquid and a characterisation of the pattern of the stain. This method made it possible to detect differences among coating layers with different compositions. In many cases, the absorption non-uniformity could be linked to variations in the coating thickness and/or wettability. The thinner and thicker areas of the coating layers were interpreted as having different pore structures. Neither the coating thickness nor the wettability could provide a full explanation, which showed the need to develop a method to characterise absorption uniformity instead of only relying on measuring the total absorption potential.

Place, publisher, year, edition, pages
2012. Vol. 27, no 2, p. 459-465
Keywords [en]
Coated Board, Flexographic printing, Liquid absorption, Test Method
National Category
Manufacturing, Surface and Joining Technology
Identifiers
URN: urn:nbn:se:ri:diva-9730DOI: 10.3183/NPPRJ-2012-27-02-p459-465Scopus ID: 2-s2.0-84865212541OAI: oai:DiVA.org:ri-9730DiVA, id: diva2:968506
Available from: 2016-09-12 Created: 2016-09-12 Last updated: 2023-06-08Bibliographically approved

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Thorman, Sofia

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