This study was developed to evaluate the effects of different compositions of plywood of
Pinus maximinoi
,
Pinus oocarpa
e
Pinus tecunumannii
. Were manufactured in laboratory plywood composed by seven veneer
with 3,0 mm thickness, with standard composition, longitudinal reinforced composition and transversal
reinforced composition. Were used for veneer gluing the phenol- formaldehyde resin with the following
formulation in parts of weight: resin = 100, extender = 10 and water = 10. The amount of glue spread was
160 g/m² (one side layer). The boards were pressed at temperature of 150ºC, specific pressure of 15 kgf/
cm² and press time of 15 minutes. Were realized static bending tests in the parallel and cross direction.
The boards of
Pinus maximinoi showed better results in MOE and MOR, parallel and cross direction in
comparison to boards of
Pinus oocarpa and
Pinus tecunumannii. The boards made from three species
showed satisfactory results of MOE and MOR, parallel and cross direction, in comparison to commercial
plywood of
Pinus taeda
. The veneer reinforced in to parallel and cross direction not influenced significantly
in the results of MOE and MOR parallel direction. The longitudinal veneer reinforced plywood affects
poorly the results of MOE and MOR in the cross direction.
