Propriedades físicas e mecânicas de painéis de lâminas paralelas (PLP) produzidos com madeira de Hevea brasiliensis

Abstract

The aim of this work was to evaluate the feasibility of Hevea brasiliensis wood species for the production of vertically laminated veneer lumber panels (LVL). The panels were produced with seven veneers arranged in the same grain direction, bonded with resorcinol-formaldehyde (RF) and vegetal polyurethane (PV) adhesives, with three grammages (240, 280 and 320 g.m-2 ), specific pressure of 1 MPa and ambient pressing temperature. Regarding to the physical tests performed, the moisture, apparent density and water absorption of the panels were evaluated; already for the mechanical properties, it was evaluated the resistance and stiffness to the parallel compression to the fibers and the Janka hardness. The results indicated a statistical difference of the main effects: grammage and type of adhesive only for the water absorption and for the parallel compression tests. For all evaluated properties, both adhesives presented similar behavior. Panels were below the maximum limit of 10% for resistance to delamination. It was concluded that the species presents technical feasibility for the production of LVL panels, being able to minimize production costs through the use of a lower grammage of both adhesives studied.