Iranian Journal of Wood and Paper Science Research
Year:2003 | Volume:- | Issue:17|Papers Count:4

In this investigation physical and mechanical properties of oak (Quercus castaneaefolia C.A. Mey) in Sangdeh region of Caspian Forests were measured according to the ASTM Standard D-143-83 for small samples. Statistical analysis included the performing of factorial design and Duncan's multiple- range test.The results indicated that geographical direction on the stems were not significant sources of differences for physical and mechanical properties, but the effects of height of stems were great and statistically significant and in most cases properties decreased with increasing height.

Particleboard industries are a dynamic industry, that has been established and grown rapidly in Iran. Demand for Particleboard has been increased rapidly due to increase population, thus the possibility of utilization residues from other wood using industries or other lignocellulosic raw materials should be investigated. The boards made for this study contained Haloxylon sp. and wheat straw at 0: 100, 75: 25, 50: 50 and 25: 75 ratios as raw material. Samples of all the boards made were tested by the methods described in DIN 68763 standard, to obtain mean values of bending strength, internal bond strength (IB) and thickness swelling.The results of this study showed that there are no significant statistical differences among each combination for MOR and MOE but with increasing the percentage of wheat straw the MOR of boards was found to increase. There were statistical differences among each combination of IB wheat straw had the lowest IB, where as the highest IB were observed on the boards with 100 percent Haloxylon sp.In addition, samples of each type of board were tested for thickness swelling (T.S) after immersion in water for 2 and 24 hours respectively, and the results indicate that there were statistical differences among each combinations and the lowest thickness swelling value was belong to the boards with 100 percent Haloxylon sp. which had the highest IB. It was also observed that the board made of Haloxylon sp. and wheat straw at with 25: 75 ratio had the highest T.S immersion in water after 2 and 24 hours.

Wood samples of seven Iranian hardwood species including: Beech (Fagus orientalis), Oak (Quercus castaneaefolia), Hombeam (Carpinus betulus), Alder (Alnus subcordata), Oriental plane (Platanus orientalis), Eucalyptus camaldulensis and Babul (Acacia arabica) were treated with Creosote and Celcure. Then the samples were installed in the sea water of Bandar Abbas coast (Persian Gulf) for a period of 36 months. During 9, 12, 18 and 36 months, the samples were inspected according with recommendation of IRG/WP/4432(l985).The results showed that, untreated samples of all species were not resisted to the marine borers. The samples treated with creosote using full cell process increased durability of all species expect Hombeam and Babul. Treated samples with celcure were not resisted very well and after 15 months were destroyed.

Sart long horn beetle (Aeolesthes sarta) is one of the most important pests of elm, walnut, poplar, sycamore and... in Iran. The wood of these trees is valuable and they can be attacked by A. sarta. For the first time in the world, during 1997 -2001, quality and quantity of damage of A. sarta on host trees was investigated. To evaluate damage amount and reduction of wood production, the number and volume per cubic meter of galleries, and quantity of wood fed by the larvae were evaluated.Also for evaluation of quality damage, nonaffected wood as well as infected wood were compared in terms of economical and industrial values. The results indicated that the quantity damage on the wood of trees was considered as high and larvae fed about 20% of wood. In the mean time, because of dying of the trees, production of wood stopped completely.Sometimes, heartwood particularly pith of the trees was fed and about 50% Of trunk become hollow. Because of damages and existence of numerous galleries, the quality of wood has lowered and so wood has no industrial use and some of tree:species such as walnut and alder lost their economical value up to 90%.