USO DE PRODUTO NATURAL NA PRESERVAÇÃO DE LÂMINAS E PAINÉIS COMPENSADOS MULTILAMINADOS

Abstract

The preservative treatment of plywood can be carried out on the panel or on the wooden veneers using chemicals that are toxic to biodetermination and with autoclave processes, which require time and resources. In view of this, considering the high surface area per volume ratio existing in wooden veneers, it was proposed to test treatment methods applied to the veneers before panel production, without the use of pressure, with chromated copper borate – CCB and a preservative based on of aqueous tannin solution. To verify the feasibility of using preservative treatments, this research was organized in a sequence of experiments in which, firstly, the measurement of retention and penetration was taken and subsequently, the resistance to biodeterioration and combustion as well as the effects on physical-mechanical properties of the panels. It was possible to treat Pinus taeda and Eucalyptus dunnii wood veneers using processes without the use of pressure, in which the choice of solution concentration must meet the minimum required product retention and penetration. No influences of the treatment of the blades on their physical-mechanical properties were observed. For the panels that met the preservative retention and penetration requirements, it was generally found that the treatment of wood veneers with tannin did not influence their physical-mechanical properties, resistance to biodeterioration and combustion. The use of CCB, on the other hand, reduced the mechanical properties of the panels, but improved their resistance to biodeterioration. It is possible to treat wood veneers before the plywood panel production process using the simplest processes.