文献类型：期刊文献

英文题名：Effect of water/moisture migration in wood preheated by hot press on sandwich compression formation

作者：Huang, Rongfeng[1] Feng, Shanghuan[2] Gao, Zhiqiang[3]

第一作者：黄荣凤

通信作者：Huang, RF[1]

机构：[1]Chinese Acad Forestry, Res Inst Wood Ind, Key Lab Wood Sci & Technol, State Forestry & Grassland Adm, Beijing 100091, Peoples R China;[2]Int Ctr Bamboo & Rattan, Beijing Bamboo & Rattan Sci & Technol, Key Lab Natl Forestry & Grassland Adm, Beijing 100102, Peoples R China;[3]Xi Chang Univ, Coll Agr Sci, Xi Chang 615000, Sichuan, Peoples R China

年份：0

外文期刊名：HOLZFORSCHUNG

收录：;EI(收录号：20224313010515);Scopus(收录号：2-s2.0-85140375037);WOS:【SCI-EXPANDED(收录号:WOS:000868526500001)】；

基金：The authors acknowledge the financial support of the National Natural Science Foundation of China (grant nos. 32071690; 31670557).

语种：英文

外文关键词：compressed layer(s); preheating; sandwich compression; water; moisture distribution; water; moisture migration

摘要：By regulating preheating time, effects of water/moisture immigration and distribution in wood on sandwich compression formation were investigated in this study. Kiln-dried poplar wood was first immersed in water to result in high moisture content (MC) layers on wood surfaces. These wood specimens were then conditioned at room temperature in sealed plastic bags and preheated with hot press platens at 180 degrees C to drive water/moisture into wood. Wood preheated for 10-600 s contained one to two high MC layers all the time. Extended preheating time moved the high MC layers from wood surfaces to the center. Mechanical pressure on preheated wood specimens resulted in sandwich compressed wood with the compressed layer(s) position(s) consistent to that of the high MC layer(s) before compression. The positions of compressed layer(s) and MC peak(s) both increased exponentially as a function of the logarithm of preheating time. Wood preheating by platens led to water/moisture migration and therefore controlled water/moisture distribution, thus promoting the softening of specific wood layer(s), which is mainly responsible for sandwich compression. A logarithmical model that can be used for predicting the position(s) of the compressed layer(s) was developed.