Effects of Press Parameters on Some Technological Properties of Polystren Composite Plywood

Abstract

Aim of study: Formaldehyde content of most of resins used in wood based composite production, wood composite materials have been seen a threat on human health and environment. Therefore, numerous studies have been made to develop an effective method to decrease formaldehyde emission from the wood based panels and various methods have been tried. The aim of the study was to investigate those effects of press parameters on some technological properties of polystren composite plywood. Area of study: This study was conducted at the Pilot Facility of Department of Forest Industry Engineering, Karadeniz Technical University in Trabzon, Turkey. Material and Methods: Poplar ( Populus deltoides ) veneers were used to produce polystren composite plywood. Urea-formaldehyde adhesive was used as bonding material for traditional plywood panels. Three different press temperature (130, 140, 150 o C) and pressing time (6, 8, 10 minutes) were chosen as press parameters in the manufacturing of polystren composite plywood. Bonding strength, bending strength, modulus of elasticity, density and equilibrium moisture content of panels were determined according to TS EN 314-1, TS EN 310, TS EN 323 and TS EN 322, respectively. Main results: The experimental results showed that mechanical properties and density of panels generally increased with increasing press temperature and pressing time whereas the equilibrium moisture content of panels decreased. Research highlights: This study showed that polystyrene wastes can be used in plywood manufacturing as an alternative bonding material for interior uses.