Characterization of curtain coating colors

Annaleena Kokko, John Kettle, Hille Rautkoski, Yingfeng Shen

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

2 Citations (Scopus)

Abstract

Curtain coating is an important paper coating technology relevant for the applications that have an increasing demand for optimization of coating functionality and minimization of costly components. In this study we have highlighted the characteristics of some simple low solids curtain coating colors which may help to formulate and optimize curtain coating flows in order to prevent operational defects, such as irregular heel formation, air-entrainment and other curtain instabilities. Furthermore the characteristics of these simple colors are used for simulation modeling to verify the model and predict color behavior in a curtain coater slide without necessarily running a pilot trial for every combination of color components. In this work a good correlation between the film thinning rate predicted by the model and the dynamic surface tension at 1 second bubble life time was found. High viscosity stabilizes the curtain and less surface tension deviation from its static value at a relevant time scale is also beneficial to curtain stability. The model could be used to predict slide curtain minimum flow rate (MFR) from coating color rheology and dynamic surface tension measurement. Our results suggest that extensional viscosity is of limited importance in curtain coating for coating colors exhibiting low viscoelasticity.
Original languageEnglish
Title of host publicationTAPPI 11th Advanced Coating Fundamentals Symposium
Subtitle of host publicationThe Latest Advances in Coating Research and Development. Munich, Germany, 11-13 Oct. 2010
PublisherTAPPI Press
Pages436-454
ISBN (Print)978-159510203-4
Publication statusPublished - 2010
MoE publication typeA4 Article in a conference publication

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Kokko, A., Kettle, J., Rautkoski, H., & Shen, Y. (2010). Characterization of curtain coating colors. In TAPPI 11th Advanced Coating Fundamentals Symposium: The Latest Advances in Coating Research and Development. Munich, Germany, 11-13 Oct. 2010 (pp. 436-454). TAPPI Press.