Assessment of printability of wood materials in relation to indirect gravure printing
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For direct printing, the quality of the printing substrate is crucial. At present standardised criteria for evaluating quality of woodbased surfaces do not exist. The present paper discusses methods for characterisation of surfaces of wood-based materials such as NIR, roughness measurement and SEM. On the base of these methods consolidated parameters are determined to describe printability of surfaces of wood-based materials. Therefore various laboratory and industrial wood panels were sanded, coated and printed by indirect gravure printing. Their surfaces were analysed before and after printing. As a result, procedures have been developed that allow a realtime assessment of the surface quality of wood surfaces with respect to their suitability for the indirect gravure printing. First, changes of roughness of the wood surface due to a defined humidification are analysed; the so determined difference of roughness parameters describes the suitability of wood surfaces for direct printing. Secondly, primed surfaces are scanned using NIR; the measured values are consolidated to parameters, which can be used to describe the printability of these materials.