文献类型：期刊文献

英文题名：Effects of microwave pretreatment on drying of 50 mm-thickness Chinese fir lumber

作者：Weng, Xiang[1] Zhou, Yongdong[1] Fu, Zongying[1] Gao, Xin[1] Zhou, Fan[1] Jiang, Jinghui[1]

第一作者：Weng, Xiang

通信作者：Zhou, YD[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China

年份：2021

卷号：67

期号：1

外文期刊名：JOURNAL OF WOOD SCIENCE

收录：;EI(收录号：20210709930555);Scopus(收录号：2-s2.0-85100965145);WOS:【SCI-EXPANDED(收录号:WOS:000619141800001)】；

基金：This work was supported by National Key Research and Development Project of China [2016YFD0600701].

语种：英文

外文关键词：Microwave pretreatment; Chinese fir; Drying rate; Permeability

摘要：Low permeability of wood causes problems during drying of timber. This study evaluated the effects of microwave (MW) pretreatment on the conventional drying behavior and mechanical damages of Chinese fir lumber. MW pretreatment of lumber was performed at applied MW energy of 43 kWh/m(3), and then, the samples were dried in a laboratory drying kiln. The results showed that the drying rate was effectively increased after MW pretreatment. The moisture content (MC) deviation in thickness and residual stress indexes of MW-pretreated samples were significantly decreased in comparison with the control samples, and the appearance quality of wood samples was not clearly affected by the MW pretreatment. Scanning electron microscope (SEM) micrographs demonstrated that pit membranes were damaged after MW pretreatment, and the micro-cracks in radial section as well as detachments between ray parenchyma cells and tracheids were also observed. Consequently, new pathways for moisture migration during drying process were formed after MW pretreatment, which contributed to the improved permeability of Chinese fir lumber and decreased drying time.