Effect of Microwave Treatment on Moisture Sorption Isotherm of Mongolian Scotch Pine

En-guang XU; Lan-ying LIN; Shan-ming LI; Li-min PENG; Feng FU

doi:10.12326/j.2096-9694.2020093

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Effect of Microwave Treatment on Moisture Sorption Isotherm of Mongolian Scotch Pine
1.Research Institute of Wood Industry，Chinese Academy of Forestry，Beijing 100091，China
Vol. 35, Issue 1, Pages: 20-25(2021)
DOI： 10.12326/j.2096-9694.2020093

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徐恩光,林兰英,李善明等.微波处理对樟子松木材等温吸湿特性的影响[J].木材科学与技术,2021,35(01):20-25.

XU En-guang,LIN Lan-ying,LI Shan-ming,et al.Effect of Microwave Treatment on Moisture Sorption Isotherm of Mongolian Scotch Pine[J].Chinese Journal of Wood Science and Technology,2021,35(01):20-25.
徐恩光,林兰英,李善明等.微波处理对樟子松木材等温吸湿特性的影响[J].木材科学与技术,2021,35(01):20-25. DOI： 10.12326/j.2096-9694.2020093.

XU En-guang,LIN Lan-ying,LI Shan-ming,et al.Effect of Microwave Treatment on Moisture Sorption Isotherm of Mongolian Scotch Pine[J].Chinese Journal of Wood Science and Technology,2021,35(01):20-25. DOI： 10.12326/j.2096-9694.2020093.

摘要

以樟子松木材为对象，使用动态水分吸附仪，借助GAB模型分析微波处理对樟子松试材的等温吸湿特性影响。结果表明，GAB模型能够很好地描述樟子松微波处理材的等温吸湿特性，微波处理没有改变木材等温吸湿曲线线型；微波处理后樟子松木材平衡含水率下降，单层分子饱和吸附量和有效比表面积降低，表明微波处理可以降低樟子松木材的吸湿性能。在低初含水率或高微波功率密度条件下，木材平衡含水率变化量较大，且早材的平衡含水率降幅大于晚材，说明微波处理对早材细胞壁的影响较大。

Abstract

In this research, the dynamic vapor adsorption system with a GAB model was used to analyze the isothermal hygroscopic characteristics of the microwave treated Mongolian scotch pine (,Pinus sylvestris, var. ,mongolica, Litv.) wood. The results showed that the GAB model described the isotherm moisture absorption process of microwave treated wood well; microwave treatment did not change the isotherm moisture absorption curve line shape. After a microwave treatment, the equilibrium moisture content decreased; the monolayer saturation adsorption and the effective specific surface area decreased. The decreased degree was significant when the initial moisture content was low and/or the microwave power density was high. It was indicated that a microwave treatment reduced the moisture absorption property of Mongolian scotch pine wood effectively. Under the condition of low initial moisture content or high microwave power density, the change of equilibrium moisture content was larger, and the decrease of equilibrium moisture content of early wood was greater than that of late wood, which indicated that microwave treatment had more influence on early wood cell wall.

关键词

微波处理樟子松木材等温吸湿GAB模型比表面积

Keywords

microwave treated woodMongolian scotch pine（Pinus sylvestris var. mongolica Litv.）sorption isothermsGAB modelspecific surface area

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