Drying characteristics of 5 species of tropical plantation wood were studied by the100℃-test method. The results showed that almost every sample had some light end checks and thesamples of Eucalyptus citriodora and E...Drying characteristics of 5 species of tropical plantation wood were studied by the100℃-test method. The results showed that almost every sample had some light end checks and thesamples of Eucalyptus citriodora and E. exserta were severer than the others in the end check.E. grandis × E. urophylla and Acacia mangium were the severest in internal checks, followed byE. grandis, E. exserta and E. citriodora. And E. grandis and E. grandis × E. urophylla were theseverest in cross-section deformation, followed by A. mangium, E. citriodora and E. exserta. All these5 species of tropical plantation wood were difficult to dry, so the mild drying schedules should beadopted and at the early stage the drying temperature should not be over 50 oC and the relative humidity(RH) should be high. Five drying schedules were gained through analyzing the drying characteristics ofthese tropical species after the 100℃- test.展开更多
The drying characteristic was studied for plantation wood of Chinese fir and poplar, which are typical plantation wood of southern and northern part of China, respectively. Through 100-degree-method the drying charact...The drying characteristic was studied for plantation wood of Chinese fir and poplar, which are typical plantation wood of southern and northern part of China, respectively. Through 100-degree-method the drying characteristic and basic drying condition were gotten, then drying schedule was developed for practical drying, the results showed that the drying schedule is suitable for Chinese fir and poplar plantation lumber, but shrinkage is large. The recommendation was made that enough dead weight is needed to decrease shrinkage in drying process. The drying quality of the two species of lumber is good in conventional drying method.展开更多
文摘Drying characteristics of 5 species of tropical plantation wood were studied by the100℃-test method. The results showed that almost every sample had some light end checks and thesamples of Eucalyptus citriodora and E. exserta were severer than the others in the end check.E. grandis × E. urophylla and Acacia mangium were the severest in internal checks, followed byE. grandis, E. exserta and E. citriodora. And E. grandis and E. grandis × E. urophylla were theseverest in cross-section deformation, followed by A. mangium, E. citriodora and E. exserta. All these5 species of tropical plantation wood were difficult to dry, so the mild drying schedules should beadopted and at the early stage the drying temperature should not be over 50 oC and the relative humidity(RH) should be high. Five drying schedules were gained through analyzing the drying characteristics ofthese tropical species after the 100℃- test.
文摘The drying characteristic was studied for plantation wood of Chinese fir and poplar, which are typical plantation wood of southern and northern part of China, respectively. Through 100-degree-method the drying characteristic and basic drying condition were gotten, then drying schedule was developed for practical drying, the results showed that the drying schedule is suitable for Chinese fir and poplar plantation lumber, but shrinkage is large. The recommendation was made that enough dead weight is needed to decrease shrinkage in drying process. The drying quality of the two species of lumber is good in conventional drying method.
