Abstract
ABSTRACT The present study has the objective of evaluating the physical-mechanical properties of plywood produced with Acrocarpus fraxinifolius wood, as well as the effect of combining their veneer with Pinus veneer. The wood of Acrocarpus fraxinifolius and Pinus oocarpa were used in the production of the panels. The plywood was produced with five veneers; the adhesive used was phenol-formaldehyde, weighing 320 g.m-2. The evaluated properties were: equilibrium moisture (EM), specific mass (SM), water absorption (WA), thickness swelling (TS), shear strength (SS), modulus of rupture (MOR) and modulus of elasticity (MOE) both parallel and perpendicular to the fibers. No statistical difference was observed in the EM and TS, whereas all other properties showed statistical differentiation between the treatments. In general, the use of Acrocarpus fraxinifolius veneers improved the physical-mechanical properties of the compensated ones. Thus, the use of this species in the production of plywood is technically feasible.
Highlights
Indian cedar has technological properties intrinsic to its wood that lead to significant improvements in water absorption (WA), modulus of rupture (MOR), modulus of elasticity (MOE) and shear strength (SS) properties compared to pine panels
The difference between the basic densities of the two species did not interfere in the heating time of the logs, nor was there any damage in the knife and counter-knife of the rolling mill or in the quality of the veneers produced
Plywood produced with five Indian cedar veneers presented lower values of WA and higher values of MOR, MOE and SS
Summary
In Brazil, current research on the use of fast-growing species in forest plantations for producing veneers and panels has been developed. In this field, the research seeks alternatives to Pinus, widely used in the plywood industries (Iwakiri et al, 2001). There is little information on the use of this species in the production of plywood In this context, the present study has the objective of evaluating the physical-mechanical properties of plywood produced with Acrocarpus fraxinifolius wood, as well as the effect of combining these veneers with Pinus oocarpa veneers. To evaluate the effect of the different treatments on the physical-mechanical properties of the panels, the results were submitted to analysis of variance and Scott-Knott mean test, both at 5 % significance level
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