Produção de painéis compensados estruturais com diferentes ciomposições de lâminas de Eucalyptus saligna e Pinus caribaea

Abstract

The objective of this work was to evaluate the quality of structural plywood manufactured with veneers of Eucalyptus saligna and Pinus caribaea var. caribaea, var. hondurensis, var. bahamensis, using different board compositions. It was manufactured experimental panels measuring 50 x 50 cm composed by 5 veneers with 2.2 mm thickness, according to following compositions: (1) panels with all veneers of Eucalytpus saligna and Pinuscaribaea (T1 to T4); (2) panels with veneers of Eucalyptus saligna mixed with Pinus caribaea (T5 to T10). The panels completely manufactured with veneers of Eucalyptus saligna showed higher values of glue line shear strength, parallel and perpendicular MOE and MOR. The panel compositions using the veneers of both species with alternate position in the layer did not effectively influence the properties of glue line shear strength, perpendicular MOE and MOR. The placing of Eucalyptus saligna veneers on the face of plywood resulted in higher values of parallel MOE and MOR. The results of mechanical properties of plywood evaluated in this study were satisfactory in comparison to the control values of the literature and with those the minimum values required by technical standards, indicating the feasibility of production of "combi" type plywood using different veneer combination of hardwood and softwood species.