Determination of the causes of spatch damage caused by impregnating resin/finish coat formulations for decorative films
Pages: 50 - 52
At the Institute of Wood Technology Dresden, a rapid method was developed which records the late defects of delamination and greying of surface materials directly on the unprocessed film. The influences of the chemical formulation components and the characteristic values (solids content, viscosity, density, pH-value, penetration time, molar ratio, molar mass distribution) of different UF impregnating resins, finishing varnishes, laboratory-produced decorative foils and edging materials as well as coated wood-based panels on the processing and usage properties of decorative foil and edging material for broad surface coating and wrapping were investigated. The reason for the delamination of the coating materials can be the penetration of components of the foil lacquer into the impregnation zone. The influence of the climate on the migration of the formulation components is of immense importance. From this it can be concluded that the balanced moisture and temperature balance of coating materials and carrier boards has a great influence on the later adhesion and product quality. The cause of greying of processed films is the reduction in the solubility of certain plasticizers as a result of progressive crosslinking of the reactive binder component.