MODIFYING KILN DRYING SCHEDULE FOR 7.5cm THICK BEECH (FAGUS ORIENTALLIS) FROM SARI REGION
In order to establish kiln drying schedule for Beech (fagus orientalis) lumbers at 7.5cm thickness commercially were cut from Sari Forests located at elevation of 700m above sea level, in Northern Iran.Boards were kiln dried at three replications utilizing three kiln schedules of T4-D3 (Proposed by FPL for red Oak wood),T4-D4,T5-D4 for drying the lumbers down to the final moisture content of 8±2％ in shorter time and better quality.The primary dry bulb temperature for each of three schedules was adjusted at 43, 43 and 49°C, respectively, and the final dry bulb temperatures of all schedules were adjusted at 71°C and one will choose the program with the shortest time.Basic specific gravity and dry specific gravity were measured as 0.52, 0.61, respectively.Longitudinal, radial, tangential and volumetric shrinkage were determined as 0.46 ％, 5.8％, 10.2％, 16.48％, respectively.Quantity of defects including crook, bow, twist and three longest surface checks of the lumber were measured before and after the drying process in each stage.In order to analyse the lumber defects for estimating the best schedule, quality control graph were used.An analysis of the results indicates that with either of three kiln schedules the extents of defects before and after drying were not statistically different and can be accepted.However, the distribution of defects caused by second schedule (T4-D4) was more uniform in respect to average line as compared to other two schedules.In other words, application of T4-D4 kiln schedule for beech boards will reduce the drying time and improves dried wood quality.At the end of this schedule the 24 hours conditioning is recommended.
kiln schedule bowing crock twist conventional kiln
Vahid Tazakor rezaei Sadegh Mohammadpour
Department of Wood & Paper Science and Technology ,Chalus Branch,Islamic AzadUniversity,Chalus ,maza MSc of wood science and technology,forestry organization
国际会议
The 7th Asia-Pacific Drying Conference(第七届亚太地区干燥会议 ADC2011)
天津
英文
1-6
2011-09-18（万方平台首次上网日期，不代表论文的发表时间）