Wood from Eucalyptus clones as raw material for the production of plywood panels

In this study, the objective was to evaluate the potential of five Eucalyptus clones, at a juvenile age of 48 months, for making multi-laminated plywood panels. The statistical design used in the experiment was randomized blocks, a 5 x 3 factorial scheme, considering two factors: clone and composition of the compensated panel, with six replications per panel. Blades of four clones of E. dunnii and one of E. saligna were used as coating, while the core of the plywood consisted of Pinus and Virola blades. In the construction of the plywood panels, resorcinol-formaldehyde with a weight of 320 g/m2 was used as an adhesive. The pressing cycle followed the following parameters: pressure of 1.47MPa, room temperature (20 +/- 3 degrees C) and time of 8 minutes. To verify the quality of the manufactured product, the following physical and mechanical parameters were analyzed: basic density (Kg/cm3), moisture content (%), shear strength (Mpa), wood failure (%), rupture and elasticity test (Mpa). The results revealed that E. dunnii clones presented great potential for the production of multi-laminated plywood panels, since the physical and mechanical properties of these panels were within the range described as adequate in the standards: NBR 9484 (moisture content), NBR 9485 (basic panel density), NBR 12466 (shear strength) and NBR 9533 (static bending). The genetic material that presented the best performance in all physical-mechanical analyzes was the USP/IPEF 68 clone - Eucalyptus dunnii.