Produção de compensados de Pinus taeda e Pinus oocarpa com resina fenol-formaldeído

Abstract

The objective of this study was to evaluate the quality of the plywood, manufactured from Pinus taeda and Pinus oocarpa, with 20 and 24 years old respectively, using three different formulations of the fenol-formaldheyde resin. The results of the glue line shearing tests not showed statistical differences between the species and three resin formulations. In the hot water test, all of the boards were classified as “BR” and, the boards of the Pinus oocarpa produced with formulations (1) and (3), were classified as “WBP”. The different resin formulations not influenced on the modulus of elasticity (MOE) and modulus of rupture (MOR) The boards of Pinus taeda with formulations (1) and (2) showed higher values of MOE in comparison of the Pinus oocarpa. The MOR of the Pinus oocarpa with formulation (2) was higher than Pinus taeda. The mechanical properties of the plywood were probably influenced by wood variability related to sapwood and hartwood, thickness of growth rings and, springwood and summerwood.