For the research the samples of dried (moisture content was 12 %) ash (Fraxinus excelsior L.) wood were used. Before wood finishing, the surfaces of the samples were sanded. In order to get different surface roughness the abrasive material of P80, P120, P150, P180, P220 and P240 grit was used. The parameters of surface roughness Ra, Rz and Rmax were measured in three directions: along the wood grain, across the grain and in the angle of 45º. The non-linear dependency of roughness parameters was noticed. For evaluation of adhesion strength, the polyurethane coating of clear varnish was obtained. Dimensions of finished samples were 50×50×15 mm. Twenty samples were prepared to test each group of roughness. The adhesion strength of wood coatings was assessed using the pull-off method (according to ISO 4624:2002 standard). The obtained results and dependencies are presented in the article.
Keywords: ash wood, surface roughness, polyurethane coating, adhesion strength, pull-off testing
Authors
Vitosytė J.
Department of Wood Technology, Kaunas University of Technology, Kaunas
Ukvalbergienė K.
Department of Wood Technology, Kaunas University of Technology, Kaunas
Keturakis G.
Department of Wood Technology, Kaunas University of Technology, Kaunas
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