Screw and Nail-Holding Capacities of Combi Plywood Produced From Eucalyptus, Beech and Poplar Veneer

Abstract

Combi plywood (combination plywood) consists of plywood made of two or more veneer sheets peeled from different species of wood. Combi plywood has some advantages such as its low weight, low cost, satisfactory performance, and the availability of abundant raw materials. In this study, five-ply combi plywood panels were produced from eucalyptus, beech, and poplar using urea formaldehyde adhesive to combine rotary-peeled veneer sheets. Three plywood groups were produced with different combinations, and we investigated the screw withdrawal and nail holding capacity of the combi plywood. In addition, we determined the air-dried density and equilibrium moisture content of the plywood panels that were produced. The test results were analyzed using the SPSS software program. We used the data that were obtained to determine the combi plywood that provided the greatest screw and nail holding capacities. In addition, we investigated the relationship between density and fastener holding capacity.