An investigation of some physical and mechanical properties of laminated veneer lumber manufactured from black alder (Alnus glutinosa) glued with polyvinyl acetate and polyurethane adhesives

Abstract

This study was designed to determine some physical and mechanical properties of laminated veneer lumber (LVL) made of black alder (Alnus glutinosa). Veneers were prepared from 2-mm and 4-mm-thick black alder and glued using polyvinyl acetate (PVA) and polyurethane (PU) adhesives. Results showed that the specific gravity and mechanical properties of the LVL produced from 2-mm veneers were higher compared to those from 4-mm veneers. In other words, as the thickness increases, a decrease is observed in the specific gravity and mechanical property values. Except for nail- and screw-holding strength values perpendicular to the glueline, all the other values obtained with the PVA adhesive were higher compared to those obtained with the PU adhesives.