Physical, mechanical, technologic and chemical properties of Fagus orientalis and Picea orientalis wood treated by heating

Physical, Mechanic, Technologic and Chemical Properties of Fagus orientalis and Picea orientalis Wood Treated by Heating In this study, some physical, mechanic, technologic and chemical properties of heated wood beech (Fagus orientalis) and spruce (Picea orientalis) woods were investigated. Heat treatment was applied on the wood samples at four different temperatures (130, 150, 180 and 200 °C) and three different durations (2, 6 and 10 hour) under atmospheric pressure (± sensitively). As physical properties; specific gravity, rate of the water absorption, water repellency efficient, equilibrium moisture content, as mechanic properties; static bending strength, modulus of elasticity and compression strength parallel to the grain, as technologic properties; values of Brinell-hardness, as chemical properties; hot-water soluble components, solubility in extracted with % 1 NaOH, cellulose, holocellulose and lignin contents were determined. The results indicated that the effects of heat treatment on physical properties especially with dimensional stabilization was found satisfactory. Mechanic and technologic properties values generally exhibited a decrease with increasing the exposure durations and temperatures. In the chemical properties, it was seen that hemicellulose was the wood-cell components most degraded by the heat treatment. Key Words: Heat Treatment, Fagus orientalis, Picea orientalis, Thermal Degradation IX