Some of the Properties of Three-layer Particleboard Panels Made from Under-utilized Species in Oklahoma

Abstract

The objective of this study is to determine some of the properties of experimental three-layer particleboard panels made from osage orange (Maclura pomifera) and eastern redcedar (Juniperus virginiana L.), which are considered as invasive under-utilized species in Oklahoma. Static bending, internal bond strength, thickness swelling, and surface roughness characteristics of experimental panels made from particles of two species and their half and half mix are investigated. Whole-tree chipped material is used to manufacture experimental panels. The samples are tested for their mechanical strength and physical stability properties according to the procedures defined by ASTM D-1037. The modulus of elasticity of the panels made from eastern redcedar is 16.6 and 15.5% higher than the ones made from osage orange and mixed particles, respectively. Overall mechanical properties of the panels are not statistically different from each other at the 95% confidence level. Thickness swelling of the samples range from 17.4 to 23.2% as a result of 2- and 24-h water soaking tests. All panels yield adequate bending strength, stiffness, and thickness swelling. Surface characteristics of the samples are also evaluated employing a stylus type equipment. Two parameters, average roughness (Ra) and maximum roughness (Rmax) are used as indicators and it has been found that all the specimens have a relatively rough surface as substrate for typical overlaying applications.