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Film formation and barrier performance of latex based coating: Impact of drying temperature in a flexographic process
Iggesund Paperboard Workington Ltd, United Kingdom.
Victoria University of Wellington New Zealand, New Zealand.
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences (from 2013).ORCID iD: 0000-0002-1256-1708
Scion, New Zealand Forest Research Institute, New Zealand.
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2019 (English)In: Progress in organic coatings, ISSN 0300-9440, E-ISSN 1873-331X, Vol. 129, p. 43-51Article in journal (Refereed) Published
Abstract [en]

The post-application behaviour of aqueous dispersion barrier coatings is investigated. We have adapted a dispersion formulation initially optimised for rod coating, for application to linerboard by a flexographic press. The clay/talc/wax/poly(styrene-butadiene) latex dispersion coatings demonstrated a 60% reduction in water vapour transport rate across the barrier, and a 75% reduction in direct water uptake when the applied film was dried at 75 degrees C. Multi-layer coatings with a combined application rate of 7 g m(-2) exhibited Cobb(120) direct water uptake of 16.3 +/- 3.7g m(-2) (120s water contact duration) and a water vapour transport rate of 140 +/- 12g m(-2) d(-1) (23 degrees C, 50% RH). Investigation of the post-coating curing regime demonstrated a decrease in the prevalence of crack defects within the cured film, and corresponding improvement in barrier properties when higher drying temperatures were employed. Dynamic mechanical analysis of the cured films indicated improvements in homogeneity and a greater extent of intermolecular interactions in the coating formulations cured at elevated temperatures.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 129, p. 43-51
Keywords [en]
Barrier coating, Dispersion, Latex film formation, Flexography, WVTR, Cobb
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-71725DOI: 10.1016/j.porgcoat.2018.12.025ISI: 000460495800006OAI: oai:DiVA.org:kau-71725DiVA, id: diva2:1302645
Available from: 2019-04-05 Created: 2019-04-05 Last updated: 2019-04-10Bibliographically approved

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Järnström, Lars

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