Modifying Kiln Drying Schedule for 7.5cm Thick Beech (fagus Orientallis) from SARI Region

In order to modify kiln drying schedule for Beech (Fagus orientalis) lumbers of 7.5 cm thickness they were commercially cut from Sari region Nekachoob forest management plan. Three schedules namely (T4-D3, T4- D4and T5-D4) were adopted for drying the Lumber down to the final moisture content of 8±2 %. Dry bulb temperature of first two schedules was adjusted at 43˚c and 49˚c (for first and second kiln load respectively), while the final dry bulb temperature of all tree kiln schedule was adjusted at 71˚c respectively. Specific gravity (based on oven dry weight and green and dry volumes) of test materials were0.52&0.61, and radial, tangential and volumetric shrinkage were measured 5.8, 10.2and 16.46percent respectively. Physical characteristics, surface checks and warp of the lumbers were measured before and after the drying process and quality control methods were used to analyze the wood defects. Results showed that drying of Beech lumber using each of the three schedules was satisfactory; however the second schedule (T4-D4) had better drying characteristics than the others. At the end of this schedule, it is recommended to use 24 hours conditioning treatment if required.