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真空/蒸汽处理纵向新疆杨原木温度及含水率变化规律

发表时间:2017-05-15  浏览量:1206  下载量:125
全部作者: 刘建霞,黄彦快,王喜明,陈章景,WHITE Marshall
作者单位: 内蒙古农业大学材料科学与艺术设计学院;美国弗吉尼亚理工学院可再生生物材料学院
摘 要: 利用研制设备对新疆杨原木实施加热和干燥处理,研究原木材处理过程中温度及含水率变化规律,以及处理后的一些特性变化,为原木浸住、干燥等提供依据。试验结果表明,基于纵向加热的木材干燥是可行的。1)在真空/蒸汽处理初期,原木真空端温度有一定程度的降低,整个处理过程结束之后,该部位木材温度又呈现出升高趋势,温度降低与温度升高均是在边材处大于心材处。2)随着处理时间的延长,各段各层温度升至临近最大值或平衡值时,均呈现心层>次表层>表层的趋势。3)临近真空区域,由于真空的作用,有明显的水分移动迹象,即水分在中段向真空端移动、心材向边材移动,同一长度方向上呈现内表部材含水率增减不同的情况。
关 键 词: 林业工程;真空;蒸汽;水分移动;纵向;原木
Title: Temperature and moisture content changes of vacuum/steam in longitudinal Populus bolleana log
Author: LIU Jianxia, HUANG Yankuai, WANG Ximing, CHEN Zhangjing, WHITE Marshall
Organization: College of Material Science and Art Design, Inner Mongolia Agricultural University; Department of Sustainable Biomaterials, Virginia Polytechnic Institute
Abstract: To study Populus bolleana log temperature and moisture content variation in the wood processing and to provide the basis for log immersion live, we used special equipment to implement heating and drying process and some of the features of change after wood processing are provided. Results show that it is feasible to dry log by longitudinal heating. 1) At the beginning of the vacuum/steam treatment, a certain degree of temperature drop appears near the far steam area and the vacuum area of log. After the whole process is done, the wood temperature presents a certain degree of temperature rise, while temperature drops and rises in the sapwood are greater than that in the heartwood. 2) With the extension of processing time, the temperature at each layer and period rises to the maximum or the equilibrium value, the trend is as follows: the heart > the subsurface layer > the surface. 3) Near vacuum area, due to the effect of vacuum, there are obvious signs of moisture movement, that is, the water moves from the middle to the vacuum end, heartwood moves to the sapwood. In the same direction, the moisture content of the inner surface is different.
Key words: forestry engineering; vacuum; steam; moisture migration; longitudinal; log
发表期数: 2017年5月第9期
引用格式: 刘建霞,黄彦快,王喜明,等. 真空/蒸汽处理纵向新疆杨原木温度及含水率变化规律[J]. 中国科技论文在线精品论文,2017,10(9):1025-1036.
 
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