STRENGTH OF PARTICLEBOARD PRODUCED WITH MIXED WOOD TRADITIONAL AND NONTRADITIONAL FOREST SPECIES

Este trabalho teve como objetivo avaliar a resist\ueancia de pain\ue9is aglomerados fabricados com part\uedculas de madeira de Pinus taeda (pinus), Eucalyptus saligna (eucalipto), Mimosa scabrella (bracatinga) e Hovenia dulcis (uva-do-jap\ue3o) em diferentes propor\ue7\uf5es de misturas e em duas composi\ue7\uf5es de camadas. Os pain\ue9is foram produzidos em misturas de duas, de tr\ueas e das quatro esp\ue9cies para pain\ue9is monocamada, e nas propor\ue7\uf5es de duas esp\ue9cies para pain\ue9is multicamadas. Foram tamb\ue9m produzidos pain\ue9is com madeira de pinus pura. O adesivo usado foi \ue0 base de ureia-formalde\ueddo e a massa espec\uedfica nominal estabelecida foi de 0,65 g/cm\ub3. Foram avaliadas as propriedades f\uedsico-mec\ue2nicas de massa espec\uedfica, teor de umidade, flex\ue3o est\ue1tica, liga\ue7\ue3o interna e arrancamento de parafusos. As an\ue1lises permitiram avaliar o efeito da utiliza\ue7\ue3o da madeira das diferentes esp\ue9cies em misturas na fabrica\ue7\ue3o dos pain\ue9is aglomerados. Os resultados foram tamb\ue9m comparados aos requisitos das normas ANSI A 208.1. Verificaram-se aumentos nos valores das propriedades de flex\ue3o est\ue1tica, liga\ue7\ue3o interna e arrancamento de parafusos com o aumento da propor\ue7\ue3o de pinus e uva-do-jap\ue3o e diminui\ue7\ue3o com aumento da propor\ue7\ue3o de bracatinga e eucalipto. Portanto, pode-se concluir que as esp\ue9cies que mais se destacaram foram o pinus e a uva-do-jap\ue3o. Em rela\ue7\ue3o \ue0 composi\ue7\ue3o, os pain\ue9is multicamadas, em sua maioria, apresentaram-se superiores aos pain\ue9is monocamada.The objective of this work was to investigate the strength of particleboards made with wood of Pinus taeda , Eucalyptus saligna , Mimosa scabrella and Hovenia dulcis and mixtures in different proportions and two board compositions. The boards were produced in mixtures of two, three and four species for monolayer boards and proportions of the two species for multilayer boards. Panels were also produced with pure pine wood. The adhesive used was based on urea-formaldehyde and the nominal density was 0.65 g/cm\ub3. We evaluated the properties of density, moisture content, static bending, internal bond and screw withdrawal. The analyzes allowed to evaluating the use of different species wood mixtures in particleboards. The results were also compared the requirements of applicable ANSI A 208.1. The values of static bending, internal bond and screw withdrawal increased with increasing proportion of Pinus taeda and Hovenia dulcis and decreased with increasing proportion of Mimosa scabrella and Eucalyptus saligna. Therefore, it can be concluded that better species were the Pinus taeda and Hovenia dulcis. Regarding the composition, multilayer boards, mostly showed themselves superior to monolayer boards