Some mechanical properties of plywood produced from eucalyptus, beech, and poplar veneer

Bekir Cihad Bal,Ýbrahim Bektaþ

doi:10.4067/s0718-221x2014005000009

Bekir Cihad Bal, Ýbrahim Bektaþ

Open Access

https://doi.org/10.4067/s0718-221x2014005000009

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Abstract

In this study, we determined the flexural properties and tensile shear strength of five-ply plywood panels produced with eucalyptus (Eucalyptus grandis), beech (Fagus orientalis.), and hybrid poplar (Populus x euramericana) using urea-formaldehyde (UF), melamine-urea-formaldehyde (MUF) and phenol-formaldehyde (PF) adhesives. Flexural properties were tested on both parallel and perpendicular to grain samples. Tensile shear-strength tests were conducted on four glue lines of the plywood panels, and the effects of species of trees, type of adhesives, and direction of load were determined. The results of variance analyses showed that the effects of species of trees, direction of load, and type of adhesive on flexural properties were significant, but it was determined by specific flexural properties that the effect of the type of adhesive was based on the density of the plywood. In addition, as a result of findings, it can be said that specific mechanical properties may be a good predictor for comparative studies.

Highlights

Plywood is one of the important wood-based composites produced from different tree species, and it has some superior advantages compared to solid wood
The Modulus of rupture (MOR) and modulus of elasticity (MOE) values of plywood made from poplar were lower than those for plywood made from beech and eucalyptus woods
The specific modulus of rupture (SMOR) and specific modulus of elasticity (SMOE) values of the plywood made from poplar wood were greater than those for plywood made from beech wood

Summary

Introduction

Plywood is one of the important wood-based composites produced from different tree species, and it has some superior advantages compared to solid wood. Plywood is produced from softwood and hardwood species of trees, and the species used in its manufacture determine the physical and mechanical properties of the plywood. The important factors that affect the physical and mechanical properties of plywood are the density of the wood, species of trees, type of adhesives, thickness of the veneer, number of plies, and the temperature at which the veneer was dried. Among these factors, the density of the wood has the greatest effect of the properties of the plywood (Özen 1981, Örs et al 2002, Aydın and Çolakoğlu 2008)

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