جستجوی مقالات مرتبط با کلیدواژه "hornbeam wood" در نشریات گروه "صنایع چوب و کاغذ"

The purpose of this study was to measure the amount of quality decrease the Hornbeam (Carpinus betulus) wood after three period four months (12 months) of storage in the forest and compare it with the beginning of the period and identify the destroyer fungi that appeared. This research was carried out in Shastkolah in Gorgan. 15 Billets with 30 cm diameter class and length of 220 cm were cut from a Hornbeam tree and all were healthy and stored inside the forest under the same conditions and in contact with soil. The billets were cut at 50 cm intervals at each stage for physical and mechanical experiments were measured based on conventional methods and related standards. the white decay fungi Sterium hirsutum (Willd.),Trametes gibbosa Fr.,Trichaptum biformis Fr. identified on the billets. According to the results, with increasing storage time in the forest, all physical and mechanical properties, except water absorption, decreased. The maximum and minimum changes in physical properties were related to the percentage of water absorption and basic density respectively, also the maximum and minimum changes in mechanical properties related to impact resistance and modulus of elasticity respectively

In this research، drying kinetics and mass transfer coefficients (permeability and diffusion) of hornbeam wood (Carpinus betulus) from Nooshahar region were investigated. For this purpose، several boards with two nominal thicknesses of 2. 5 an 5 cm were prepared from a freshly cut log. The boards were dried inside a laboratory kiln at the dry bulb temperature of 40°C and relative humidity of 50% to the final moisture content of 6%. The pattern of moisture loss، thermal diffusion، final moisture gradient along the board thickness، transverse permeability and diffusion coefficients were then measured. The results showed that by increasing of board thickness، the rate of moisture loss decreased، particularly in the hygroscopic range and the moisture gradient increased، but the thermal diffusion was not affected. The transverse permeability and diffusion coefficient of hornbeam wood was 2. 91 × 10 -19 m 2 and 3. 29 × 10 -9 m 2s-1، respectively. Overall، it can be concluded that due to low transverse permeability coefficient of hornbeam wood، this species is difficult to be impregnated in common wood preservation process. In contrast، due to low diffusion coefficient، hornbeam wood is recommended for applications where high resistant to water vapor diffusion is required.