文献类型：期刊文献

英文题名：Moisture state variety in poplar lumber with moisture content above fibre saturation point during hot-press drying

作者：Hou, Junfeng[1,2] Yi, Songlin[2] Zhou, Yongdong[1] Pan, Bin[1]

第一作者：Hou, Junfeng

通信作者：Zhou, YD[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Beijing 100091, Peoples R China;[2]Beijing Forestry Univ, Coll Mat Sci & Technol, Beijing 10083, Peoples R China

年份：2018

卷号：64

期号：6

外文期刊名：JOURNAL OF WOOD SCIENCE

收录：;EI(收录号：20183805847608);Scopus(收录号：2-s2.0-85053528406);WOS:【SCI-EXPANDED(收录号:WOS:000445103100001)】；

基金：This work was financial supported by the National Forestry Industry Research Special Funds for Public Welfare Projects from State Forestry Administration of China (no. 201404502).

语种：英文

外文关键词：Popluous tomentosa; Hot-press drying; Temperature; Pressure; Moisture state

摘要：Hot-press drying has gained attention due to its excellent drying rate and surface strengthening effect. The moisture state in poplar lumber (Populus tomentosa) with moisture content (MC) above fibre saturation point (FSP) was analyzed during hot-press drying. The effect of heating platens' temperature on the temperature and pressure inside poplar lumber was investigated. The moisture state changes inside the poplar lumber during hot-press drying were further analysed in accordance with the measured pressure and theoretical pressure calculated with the measured temperature inside poplar lumber. Results were as follow: When the heating platens' temperature increased from 120 to 140 degrees C, the maximum values of temperature and pressure also increased by 14.5 and 26.2%, respectively. However, a delay occurred between the maximum values of pressure and temperature. The moisture at the center layer of poplar lumber with MC above FSP was in liquid state, i.e. unsaturated water under overpressure condition in hot-press drying process. Flashing occurred to the unsaturated water in poplar lumber during the opening period of heating platens and resulted in the decrease in MC. This phenomenon is the main moisture transfer mode in wood hot-press drying process with MC above FSP.