Ph.D. Tezi Görüntüleme | |||||||||||||||||||||
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| Summary: The aim of the study is to produce a new wood composite material with high strength and insulating properties by using insulating material called as polystren (styrofoam) instead of formaldehyde based adhesives as bonding material. Five wood species (beech, poplar, alder, pine, spruce), six polystyrene species with different density values were used in this study. Urea formaldehyde resin was used in conventional plywood panels manufacturing as adhesive. Technical drying was applied half of the test groups, while the other group was conditioned until reach to 12% equilibrium moisture content at room temperature as natural before manufacturing process to determine the effect of drying. Three-ply panels were produced from 2 mm thick veneers as using three different pressing times and temperature.Some mechanical properties such as shear strength, bending strength, modulus of elasticity of the panels were conducted according to TS EN 314-1, TS EN 310, respectively. Physical properties such as thickness swelling and water absorption, equilibrium moisture content, density and thermal conductivity were determined according to TS EN 317, TS EN 322 and TS EN 323, ASTM C 518 & ISO 8301, respectively. In general, the best technological properties were obtained from panels produced with low density polystyrene using beech veneers.
Key Words: Polystyrene, Wood composite material, Physical and mechanical properties, Plywood | |||||||||||||||||||||