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    Top layer coatability on barrier coatings

    Year: 2011

    Journal: Progress in Organic Coatings 2012, 73 (1) pp 26-32, 20121211

    Authors: Roger Bollström, Mikko Tuominen, Anni Määttänen, Jouko Peltonen, Martti Toivakka

    Organizations: Åbo Akademi University, Laboratory of Paper Coating and Converting, Centre for Functional Materials Porthaninkatu 3, 20500 Turku, Finland; Tampere University of Technology, Paper Converting and Packaging Technology Korkeakoulunkatu 8, 33101 Tampere, Finland

    In this study, the influence of different surface characteristics of dispersion-coated barrierlayers on toplayercoatability is examined. The barrierlayer consisted of platy pigments, such as talc and kaolin, combined with different amounts and types of latexes. Coating of the top coat was carried out using the reverse gravure technique in which a dispersion consisting of mineral pigments and latex is applied under slight pressure onto the barrier-coated substrate. Wettability and coatability were measured as a function of surface energy and surface roughness of the barrierlayer and the surface tension of the top coat dispersion. Plasma and corona surface treatments were used to increase the surface energy and wettability without affecting the surface topography. The most important aspect for predicting the coatability was the wettability, especially the water contact angle, because the top coat is an aqueous suspension. Decreasing the surface tension of the top coat dispersion also improved the coatability, whereas roughness had only a minor effect.