Iranian Journal of Wood and Paper Science Research
Year:2001 | Volume:- | Issue:14|Papers Count:5

In this study physical and mechanical properties of Beech (Fagus orientalis Lipsky) grown at two different elevations of Asalem Forests located an the north west of Gilan were investigated following the ASTM Standard. Sample trees were selected from 2 different elevations, at different high of trees, at 4 different geographical directions of the stems and 2 different moisture contents.The results of statistical analysis revealed that properties of Beech wood from this region was influenced by elevations and to the lessees extend to geographical direction of wood specimens and tree highs.

In this research solid wood properties of sound absorption coefficient in over frequency were investigated. Sound absorption at 2000, 4000 and 8000 in Hertz Frequencies was measured on the influence of effective factors in solid wood. Solid wood variable factors were species (Beech, Poplar and Alder), fiber direction (Longitudinal, Radial and Tangential) and Frequencies (2000, 4000 and 8000 in hertz). Data was analyzed using factorial experimental design at completely random blocks and DMRT test. The measurements were taken using the sound absorption with standing waves apparatus type 4002. The results of this research indicate that sound absorption at frequencies 2000, 4000 and 8000 in hertz were in maximum level for poplar wood. Longitudinal direction in solid wood had sound absorption maximum levels. Radial and Tangential direction have less sound absorption than Longitudinal direction respectively. Therefore this investigation showed that sound absorption with increasing frequency of 2000 to 8000 hertz, maximum level was considered.

In order to manufacture particleboard from various populus clones species grown in four years short - rotation, eighteen clones from different species of populus grown in "Alborz Research Center" with a control sample of Beech from Caspian Forests totally 19 combination spicement were collected and 3 boards from each treatment totally 57 experimental sample boards were produced.The effects of different species and clones of populus on physical and mechanical properties of boards were studied. The results showed that clones P.d 77.51 and P.e.561.41 grown four years had the maximum modulus of repture (MaR). The P.e. 561.41, P.e. vernirubensis showed a high modulus of elasticity (MOE), and internal bonding (IB) was the maximum in P.d. 44.9, P.n. 63.135. The minimum amount of thickness swelling after 2 hours - immersion were belong to P.d. 77.51, P.n. 42.78 and the thickness swelling after 24 hours immersion were belong to P.n. 63.135 , P.e. 42.78. respectively.It has been shown that most of the different populous clones grown four years - rotation, have the higher applicable properties than control sample for particleboard.The results of this study showed that it is possible to use 4-years-old wood of P.e. 561.41, P.d. 77.51, P.e vernirubensis, P.n. 63.135, P.e. 44.9 woods for particleboard manufacture.

In order to evaluate reed as a raw material for wood & paper industries, three main regions of Iran consist of south, North and East were selected for this study. Phragmites australis is dominant species in these regions and this study concentrated on it as well.Chemical components and biometry of fibers were determined with four and thirty replications respectively. Statistical analysis showed that there were no significant differences among three regions in fiber length and lumen diameter but reversely fiber width and cell wall thickness showed significant differences. The highest fiber length mean was 1.39mm. For North (Anzali) Coefficients of papermaking of fibers also were calculated for each region. Biometerical fiber results, showed that P. australis has good fiber compare to the Iranians hardwoods as papermaking.The results also showed that there are significant differences between regions and subregions at %5 level. North had the highest and lowest cellulose and lignin contents respectively. These results also proved that P.australis is one of the best Iranians' raw materials as cellulose and lignin contents between the others.