预处理方式对速生杨木试件密实及密闭性的影响  

Effects of Pretreatment Methods on the Compaction and Airtightness of Fast-growing Poplar

作　　者：王娱 王天龙[1] 沈杨[1] 赵鸿婧 WANG Yu;WANG Tian-long;SHEN Yang;ZHAO Hong-jing(Key Laboratory of Wood Material Science and Utilization of Ministry of Education,Beijing City Key Laboratory of Wood Science and Engineering,Beijing Forestry University,Beijing 100083,China)

机构地区：[1]北京林业大学木质材料科学与应用教育部重点实验室,木材科学与工程北京市重点实验室,北京100083

出　　处：《西北林学院学报》2020年第2期213-217,共5页Journal of Northwest Forestry University

摘　　要：为将木材制备成具有密闭性的包装材料,以速生杨木试件为材料,探讨浸泡、喷水2种处理方式对速生杨木试件水分分布、密实化后断面密度与密闭性的影响。结果表明,经过浸泡、喷水处理,试件表层含水率由5.21%分别提高到28.38%、24.08%,喷水和浸泡处理几乎可达相同的效果;无论喷水还是浸泡处理,试件的最大含水率与密实化后试件的最大密度均出现在试件表层,经浸泡、喷水处理的密实化试件表层密度分别达1.17、1.06 g/cm 3;随着最大断面密度的增加,密实化试件的平均透气速率从106.08×10-7 L·mm-2·min-1降到2.76×10-7 L·mm-2·min-1,降低了97.97%,泄漏率从28.78×10-2 h-1降到0.58×10-2 h-1,降低49.62倍,密封等级提高到3级。In order to prepare the wood into a sealed storage material,the fast-growing poplar was used as the material to investigate the effects of soaking and spraying on the moisture distribution of the fast-growing poplar,the density and the tightness of the compacted poplar.The results showed that after immersion and water spray treatment,the moisture content of the surface of the test piece increased from 5.21%to 28.38%and 24.08%,respectively.The water spray and immersion treatments could almost achieve the same effect.Regardless of water spray or immersion treatments,the maximum of the water content and the maximum density of the specimen after compaction appeared on the surface of the test piece.The density of the surface of the densified test piece after soaking and water spray treatments could reach 1.17 g/cm 3 and 1.06 g/cm 3,respectively.With the increase of maximum section density,the average gas permeability of the densified test piece decreased from 106.08×10-7 to 2.76×10-7 L·mm-2·min-1,reduced by 97.97%,and the hourly leak rate decreased from 28.78×10-2 h-1 to 0.58×10-2 h-1,reduced by 49.62 times,and the sealing level increased to level 3.

关 键 词：预处理 速生杨木 含水率 密度 密闭性 

分 类 号：S784[农业科学—林学]