CIÊNCIAS FLORESTAIS (FOREST SCIENCES)RESUMO: A madeira é responsável por mais de 40% do custo de produção de painéis aglomerados e uma das alternativas para atender a demanda da indústria e reduzir o custo de produção desses painéis é o aproveitamento dos resíduos agroindustriais. Nesse sentido, o objetivo deste trabalho foi avaliar o efeito da substituição da madeira por casquilho de soja nas propriedades físicas e mecânicas dos painéis. Os painéis foram produzidos com densidade nominal de 0,60 g cm -3 . Substituiu as porcentagens de 0, 25, 50, 75 e 100% de casca de soja em relação às partículas de eucalipto. As partículas foram encoladas com 12% do adesivo uréia-formaldeído. O ciclo de prensagem compreendeu uma pressão de 4,0 MPa e temperatura de 180 °C durante 15 minutos. Os resultados encontrados mostraram que os painéis aglomerados convencionais produzidos com resíduo de casquilho de soja apresentaram aumento de suas propriedades física e diminuição das mecânicas à medida que se aumentou a substituição da madeira por resíduo. Conclui-se que, do ponto de vista técnico, as propriedades físicas e mecânicas serão atendidas com a substituição máxima da madeira por resíduo de casquilho de soja na proporção de 28,9%.ABSTRACT: Wood accounts for more than 40% of the production cost of clad of aglomerates panels and to meet industry demand and reduces the production costs of panels, the use of agro-industrial waste is an alternative. In this sense, the objective of this work was to evaluate the effect of the substitution of wood by soybean hull on the physical and mechanical properties of the panels. The panels were produced with a nominal density of 0.60 g cm -3 . It replaced the percentages of 0, 25, 50, 75 and 100% of soybean hulls in relation to the eucalyptus particles. The particles were glued with 12% of the urea-formaldehyde. The pressing cycle comprised a pressure of 4.0 MPa and a temperature of 180 ° C for 15 minutes. The results showed that the conventional agglomerated panels produced with soybean residue showed an increase in their physical properties and a reduction of the mechanics as the replacement of the wood by residue was increased. It is concluded that, from the technical point of view, the physical and mechanical properties are met with a maximum substitution of the wood per soybean residue in the proportion of 28.9%.Aproveitamento do casquilho de soja para a produção de painéis aglomerados convencionais de baixa densidade Rev. Bras.

The use of jupati leaves and seeds, for ornamental and artisanal purposes, results in the generation of by-products such as the internal part of the petiole that, sometimes, are not used. Thus, the application of this waste for the production of materials assists the reduction of major environmental problems. In this sense, this paper aimed at using jupati petiole particles to replace eucalyptus wood to produce low density particleboards and to evaluate the effect of this incorporation on its physical and mechanical properties. The panels were composed with different percentages of waste in association with eucalyptus: 0, 10, 20 and 30%. The nominal panels' density was fixed at 0.60 g cm -3 and was bonded with urea-formaldehyde. To evaluate the properties, physical and chemical particle analysis and physical-mechanical panels tests were performed. Regarding the physical panel properties, all were classified as low density. There was an increase in the compression ratio and, consequently, in hygroscopicity as greater proportions of jupati particles were inserted. For the mechanical properties, it was observed that, in small quantities, the insertion of waste did not affect the panel's viability. Thus, it is concluded that the waste has the potential to be used as raw material in the production of panels, being included in up to 15 % for regulatory compliance.