PHYSICAL AND MECHANICAL PROPERTIES OF OSB (ORIENTED STRAND BOARD) PANELS PRODUCED WITH Pinus taeda L. (Pinaceae) (Atena Editora)

Abstract

The study aimed to evaluate the physical and mechanical properties of OSB panels produced with Pinus taeda wood. In the physical part, two treatments were adopted: a. particles produced from whole logs and b. particles from lamination residues (remainder roll). Physical properties were tested: density, humidity, water absorption at 2 and 24 hours and thickness swelling at 2 and 24 hours. There was a significant effect of particle origin on all tested properties, with the exception of moisture content. Panels made with particles from waste rolls showed lower density. The properties of AA2h, AA24h, IE2h and IE24h were influenced by the origin of the particle. The panels produced with particles from the waste roll showed higher rates of AA and IE. In the mechanical part the same treatments were adopted. The ratio for particle layers: 30:40:30. The density adopted for the panels was 0.65 g/cm3. A 6% resin based on phenol formaldehyde (PF) was used, in relation to the dry mass of the particles. The following pressing parameters were adopted: a temperature of 180 °C, pressing time of 8 minutes and pressure of 30 kgf/cm2. The mechanical properties tested were: internal bonding, modulus of rupture and modulus of elasticity in two directions: parallel and perpendicular. All the average values of the technological properties, for both treatments, were higher than those specified by the CSA Standard (1993), therefore it is recommended to use the lamination residues in the production of OSB panels.