Intermittent Drying Technologies Suitable for Plantation-grown Eucalyptus Timbers
(0) The effects of continuous and intermittent drying regimes on the total shrinkage and collapse have been investigated for six species of difficult-to-dry planted Eucalyptus timbers. The results have shown that total shrinkage and collapse in all eucalypt woods examined were greater for continuous drying than intermittent drying with the exception of an intermittent drying run based on change of relative humidity (RH). Periodic cycling of RH can lead to the increase of total shrinkage and collapse in green/saturated wood in higher drying temperature conditions (more men 60℃) rather than increasing collapse recovery and was especially obvious for lower-density eucalypts. Total shrinkage and collapse increase with increasing drying temperature, in both continuous and intermittent drying regimes, while the increasing magnitude of both parameters becomes apparently larger for continuous drying than for the intermittent drying regime, in particular for higher temperature conditions. However, it is possible to elevate drying temperature to reduce drying time for the intermittent drying regime. Increasing drying duration at each intermittent drying period had a greater effect on total shrinkage and collapse for all eucalypt wood examined. When a drying duration of six hours at an intermittent drying period is used, the differences in shrinkage and collapse between continuous and intermittent drying regimes are very slight. The duration of an intermittent drying period has a comparatively larger effect on total shrinkage and collapse for five lower-density eucalypt species, but a smaller effect on two higher-density eucalypts that were included in the study. Accordingly, we may draw a conclusion that an intermittent drying regime is very likely to be a potential drying practice for collapse-prone lower-density plantation-grown eucalypt timbers.
Wu Yiqiang Hayashi Kazuo Liu Yuan Luo Jianju Sugimori Masatoshi
Department of Wood Science and Technology, Central South Forestry University, changsha, China The Un The United Graduated School of Agricultural Sciences, Ehime University, Japan Department of Wood Science and Technology, Central South Forestry University, changsha, China College of Forestry, Guangxi University, Nanning, China
国际会议
The International Conference on Plantation Eucalyptus(桉树国际会议)
广东湛江
英文
110-119
2005-12-01（万方平台首次上网日期，不代表论文的发表时间）