EUCALYPTUS CAMALDULENSIS تاثير مواد و روش هاي حفاظتي بر روي خواص فيزيكي چوب اكاليپتوس كاملدولنسيس

The Effects of Preservative Materials and Impregnation Processes on Physical Properties of : Eucalyptus camaldulensis

Wood logs were supplied from Mamasani, Fars Province, from a population of planted eucalyptus trees. They were cut into 7*7x 100 cm samples, and dried to below 20% moisture content. A split plot design was used for the experiment. Three impregnation methods namely Bethel, Rupping and Double rupping along with three preservatives as against control samples were employed. A creosote and two other water soluble preservatives were prepared with proper pH using AWPA standard. Results are indicative of reactions of wood as well as internal wood elements to impregnation. A decrease was observed in the overall shrinkage in the treated samples. This was more pronounced in the Bethel creosote method. This indicates the stabilization of wood dimentions as a result of impregnation. Some reasons for this phenomenon could be cited as trans attachment of wood elements, subsequent drying in double drying process, and irreversible swelling. The specific gravity is less in treated samples as compared to control, this being more pronounced in the case of double nipping, and treated samples with preservatives; chromium, flourine and arsenic. This could be due to minor cracks on wood, microscopic cracks (inner layer fracture, cell wall ruptures, etc), increase in dimentions (of irreversible nature), inflation of wood elements, double drying stresses and unexpectable leaching. Milder treatment methods such as nipping and use of less volatile elements of chromium, copper and arsenic (CCA) are preferred over others.