Effect of adhesive content and strand combination on the properties of OSB made from mixed tropical fast growing tree species

Abstract

The objective of this research was to evaluate the physical and mechanical properties of OSB made from several fast growing tree species (i.e., Paraserianthes fa/catari (P), Maesopsis eminii (M), and Acacia mangium (A)) under various resin content and various strand combination. Three-layered OSBs bonded with 3%, 5%, and 7% Methane diisocyanate (MOl, Type H3M) resin with the core layer orientation perpendicular to the face and back layers. The strand composition for face, core, and back was 25%, 50, and 25%, respectively. Nine (9) strand combinations were applied consisted of 3 homogenous boards (i.e., PPP, MMM, and AAA) and 6 (six) mixed boards (i.e., PMP, PAP, MPM, MAM, AMA, and APA). The results indicated that at the same resin content, OSB manufactured from strand with lower density (PPP board) had low dimensional stability (high water absorption and thickness sweUing values). Board prepared from a mixture of low density strands and higher density strands (PMP and PAP boards) had better dimensional stability. OSB manufactured from higher density strand (AAA board) had low MOR and MOE values, the values increased by mixing strands with lower density strands (AMA and APA boards). The higher the resin content applied resulted in the better the performance of OSB. All parameters of OSB prepared from MAM and AMA strand combination with 7% resin content and MAM strand combination with 5% resin content met the requirement of CSA 0437.0) standard for grade 0-2 panels.