Journal
NORDIC PULP & PAPER RESEARCH JOURNAL
Volume 27, Issue 2, Pages 459-465Publisher
AB SVENSK PAPPERSTIDNING
DOI: 10.3183/NPPRJ-2012-27-02-p459-465
Keywords
Liquid absorption; Test Method; Flexographic printing; Coated Board
Categories
Funding
- Billerud
- Klabin
- Korsnas
- Mondi Kraft Paper
- Tetra Pak
- Knowledge Foundation and Research Institutes of Sweden (RISE)
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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.
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