Physical-mechanical Properties of Plywood Produced With Acrocarpus fraxinifolius and Pinus oocarpa

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.

摘要 本研究旨在评估顶果木（Acrocarpus fraxinifolius）木材制备的胶合板（plywood）的物理力学性能（physical-mechanical properties），同时探究其单板（veneer）与松属（Pinus）单板复合的应用效果。本研究采用顶果木与卵果松（Pinus oocarpa）木材制备试验板材。试验胶合板由五层单板压制而成，所用胶粘剂为酚醛树脂（phenol-formaldehyde），施胶量为320 g·m⁻²。本次测试的性能指标包括：平衡含水率（equilibrium moisture, EM）、体积密度（specific mass, SM）、吸水率（water absorption, WA）、厚度膨胀率（thickness swelling, TS）、剪切强度（shear strength, SS）、抗弯强度（modulus of rupture, MOR），以及平行于纤维和垂直于纤维方向的弹性模量（modulus of elasticity, MOE）。结果显示，平衡含水率与厚度膨胀率在各处理组间未呈现统计学显著性差异，其余所有指标均在不同处理组间存在显著统计学差异。总体而言，使用顶果木木单板可改善复合胶合板的物理力学性能。因此，将该树种应用于胶合板生产在技术上具备可行性。