فهرست مطالب arash farajpour roudsar

The purpose of this study is to evaluate the physical and mechanical properties of papers made of tree branches as a cellulose source. The branches of the tree Platanus orientalis plain region of Astara and the Kraft pulping process used. For the process of chemical baking soda in varying levels 10, 14, 16, 18 and 20 percent based on the dry weight of plantain wood chips were used. Also the cooking time considered in three levels of 60, 80 and 100 minutes. Cooking temperature and the cooking sulfidity in all cases remained at a constant level of 165 degrees Celsius and 25 percent, respectively and Liquor ratio plantain chips are based on standard laboratory Digester 8 to 1. Also to make handmade paper, pulp freeness were refined to reach about 25 ± 350 ml. 60 grams handmade paper were prepared of refined pulps and it’s Resistance and mechanical properties were measured. Statistical analysis of features of handmade paper based on completely randomized design factorial test, and strength features of handmade paper of the ANOVA and Duncan's test was used to compare the average. Strength properties of the produced kraft pulp by the bursting index, tensile index, folding index, rupture index and brightness, were 55/5(Kpa cm2/g), 10082(Nm/g), 55(n), 53/6(mNm2/g) and 32/53(percent), respectively.

The influence of coriolus versicolor on resistance of acetylated fagus orientalis by verjuice was examined in this research. Reducing the common effects of environmental and allergic chemical substances in wood acetylating is the motivation for choosing natural verjuice as the main acetylating material. 90 testing samples that were extracted from three beech trees in Masal woods were applied in 3 groups of 30 in order to study as available, dried and acetylated samples by verjuice. The samples were cultured on Malt Extract Agar medium in 27 °C ambient temperature for 20 days inside incubators in a laboratory environment. The results showed that the level of fungus in acetylated samples has been far less than the available and dried ones, in such way that it has been caused 57 and 65 percent of significant decrease in comparison with other samples respectively. Dry treatment also decreased the level of wood fungus meaningfully at the level of one percent in comparison with the available treatment. Acetylation has lessened thickness swelling behavior in beech trees of the area as well.