| Study on Wood Drying Properties under Vacuum-floating Pressure |
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| 作者姓名： | ZHANG Biguang YI Songlin CHANG Jianmin LI XianjunMaterial Science and Technology School of Beijing Forestry University Beijing P.R.China |
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| 作者单位： | ZHANG Biguang YI Songlin CHANG Jianmin LI XianjunMaterial Science and Technology School of Beijing Forestry University，Beijing 100083，P.R.China |
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| 基金项目： | ThisresearchprojectwasfinancedbyChineseFundCommittee(undertheContractNo59876005)andsupportedbytheFundCultivatingtheYoungTalentsofBeijingForestryUniversity(undertheContractNo200304016) |
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| 摘 要： | Using Masson pine as specimens, when drying mediums are overheated steam and hot-air respectively, preheating characteristics of wood under vacuum-floating pressure drying are discussed by measurement of internal temperature field and variation of moisture content during period of preheating. The relationship between drying medium conditions and drying rate of wood reveals that, firstly, compared with process of air-drying, time needed to be preheated under vacuum-floating decreased dramatically, meanwhile, the magnitude of condensation on the surface is relatively larger. Secondly, drying rate of wood under vacuum-floating pressure increases coupled with temperature of medium, reduction of absolute pressure, and raise of fluctuation rate of pressure. The sequence of factors contribution to drying rate is listed as following: temperature of medium (t) > fluctuation rate of pressure (f)> absolute pressure (p).
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| 关 键 词： | 松树 木材干燥 预热特性 真空悬浮压力 干燥速率 干燥条件 |
Study on Wood Drying Properties under Vacuum-floating Pressure |
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| ZHANG Biguang YI Songlin CHANG Jianmin LI XianjunMaterial Science and Technology School of Beijing Forestry University,Beijing ,P.R.China.Study on Wood Drying Properties under Vacuum-floating Pressure[J].中国林业科技(英文版),2004,3(4):65-71. |
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| Authors: | ZHANGBiguang YISonghn CHANGJianmin LIXianjun |
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| Institution: | MaterialScienceandTechnologySchoolofBeijingForestryUniversity,Beijing100083,P.R.China |
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| Abstract: | Using Masson pine as specimens, when drying mediums are overheated steam and hot-air respectively, preheating characteristics of wood under vacuum-floating pressure drying are discussed by measurement of internal temperature field and variation of moisture content during period of preheating. The relationship between drying medium conditions and drying rate of wood reveals that, firstly, compared with process of air-drying, time needed to be preheated under vacuum-floating decreased dramatically, meanwhile, the magnitude of condensation on the surface is relatively larger. Secondly, drying rate of wood under vacuum-floating pressure increases coupled with temperature of medium, reduction of absolute pressure, and raise of fluctuation rate of pressure. The sequence of factors contribution to drying rate is listed as following: temperature of medium (t) > fluctuation rate of pressure (f)> absolute pressure (p). |
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| Keywords: | wood drying vacuum-floating pressure preheating characteristics |
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