汽蒸处理过程中木材内部水分的迁移动力初探
Water migration force inner wood during steam treatment process
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摘要: 为研究汽蒸处理过程中木材内部水分的迁移动力,在温度为100 和140℃ 下,分别对厚度为2、4、6 cm 的杨木 试件进行汽蒸处理,并对处理前后试件的质量,以及处理过程中木材内部温度场进行研究;另外,在温度为110℃ 下,对木材内部压力场进行研究。结果表明:汽蒸处理后,木材含水率均有所下降,而且处理温度越高,含水率下降 越多;当处理温度为100℃时,含水率下降量为23.0%;当处理温度为140℃时,含水率下降量达到78.27%;木材 内部温度随着时间的增加而升高,最后趋于稳定,当环境温度为100、140℃ 时,木材内部最高温度分别为92、110 ℃ ;建立了不同处理温度、时间与试件含水率下降量的关系模型,以及木材内部水分减少量的理论模型,所建模型 能够很好地模拟实际汽蒸处理过程。Abstract: Poplar with the thickness of 2, 4 and 6 cm was taken as specimen in thins paper. The weight of wood samples pre-and post-treatment and the temperature field were studied under the conditions of 100 and 140℃ . What's more, the pressure field inner wood was also studied at the temperature of 110℃. The results showed that the weight of samples decreased as the time went by, and the minimum value was 23.0% when the temperature was 100℃, while the maximum value was 78.27% when the temperature was 140℃ ; the temperature inner wood increased at the beginning of pre-treatment process, and became constant at last, the maximum value were 92 and 110℃ when the treating temperature were 100 and 140 ℃ , respectively. Lastly, the relationship among the moisture content variation, the treating time and the treating temperature was founded. What's more, the theoretical model of the moisture decrement, which was corresponding to the practical value, was established to simulate the real production.