ROUGHNESS PARAMETERS OF BIO-BASED COATING APPLIED TO WOOD SURFACES
Keywords:
roughness, waterborne coating, bio-based coating, beech; spruceAbstract
This research is part of a study to determine the properties of a multilayer waterborne bio-based coating. The liquid system was applied to spruce (Picea abies Karst.), beech (Fagus sylvatica L.), and beech plywood by brush. The influences of the wood substrate structure and the surface characteristics before coating, the surface treatment before coating, the amount of varnish recommended by the manufacturer, and the number of applied layers on the appearance and roughness of the resulting surfaces were analyzed. The roughness was evaluated by the profile amplitude parameters and the material ratio curve parameters for each of the film formation process phases. It was necessary to apply a two-layer coating on all test surfaces to obtain a good appearance. It was also found that the amount of varnish recommended by the manufacturer is inappropriate when applied to beech and beech plywood. The wood substrate structure and its surface characteristics before coating had a determining influence on the roughness parameters in the last phase of the film formation and on the appearance of the varnished surfaces. The treatment before coating had little effect on the final coating parameters. Roughness parameters suitable for evaluating changes in surface profiles for each of the processing phases were proposed.
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