Evaluation of the Mechanical Properties of Particleboards Manufactured with Waste of Pinuselliottii Tree Pruning

Abstract

This work aimed to evaluate the bending strength (MOR) and the bending modulus of elasticity (M OE) of particle boards manufactured with Pinuselliottii and Eucalyptusgrandis species and the addition of waste of Pinuselliottii tree pruning, using a bicomponent polyurethane resin-based castor oil as an adhesive. We prepared nine different experimental conditions, six of the composition of particles of wood (Pinus and Eucalyptus) with pruning residue(30%, 50% and 70% waste) and other three made with 100% of each one of the three types of part icle used, evaluated by the analysis of variance (ANOVA). The panels were prepared by adding 12% of polyurethane resin on the mass particle with a mo isture content of 11%, using compaction pressure of 4.5 MPa and hot pressing of 90 o C. The results showed that the inclusion of pruning residues reduced significantly the strength and stiffness properties of the panels when compared with the materials manufacture dintegrally with Pinusor Eucalyptus particles. The MOR of the materials in all conditions test ed was less than the 18 MPa, limit value set by the Brazilian standard, shown to be necessary to adjust the parameters process used for the achievement of the regulatory requirements.