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微波、冷冻预处理对改善尾巨桉木材干燥性能的影响(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2011年02期
Page:
61-64
Column:
研究论文
publishdate:
2011-03-28

Article Info:/Info

Title:
Improving the dryability of Eucalyptus by premicrowave or prefreezing treatment
Author(s):
ZHANG Yaoli MIAO PingZHUANG ShouzengWANG XiaominXIA JinweiWU Limin
College of Wood Science and Technology, Nanjing Forestry University,Nanjing 210037, China
Keywords:
microwave freezing Eucalyptus urophylla × E.grandis collapse drying rate
Classification number :
S781.35
DOI:
10.3969/j.jssn.1000-2006.2011.02.013
Document Code:
A
Abstract:
The drying defects,such as splits,checks and collapses,are developed during the drying of Eucalyptus urophylla×E.grandis. In order to improve the dried wood quality by reducing those drying defects,the reasons that caused the collapse was explored. The effect of two pretreatments,i.e.,microwave and freezing,on wood permeability,drying rate and characteristics of collapse,were investigated. The results indicated that the permeability was more or less increased,the drying rate was raised and the collapse was reduced by using these treatments. On the control and microwave treated wood,it was observed that the crumples or wrinkles took place on borders of heartwood and sapwood. It was also seen that some wood fibers were twisted and squashed each other,their pit chambers were narrowed and the twist bands which vicinity squashed and collapsed in opposite directions were formed. The width of the twist band included 5—20 cells and the depth of the collapse was 0.76 mm on the control wood. While the width of the twist band included 5—10 cells and the depth of the collapse was 0.35 mm on the microwave treated wood. No considerable collapses were found and twist bands with a width of 1—2 cells were observed vaguely on the freezing treated wood.

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Last Update: 2011-04-13