林业工程学报2016，Vol.1Issue(6)：51-57,7.DOI:10.13360/j.issn.2096-1359.2016.06.009
过热蒸汽温度对马尾松干燥速率和力学性能的影响
Effects of the superheated steam temperature on the drying rate and mechanical properties of masson pine wood
摘要
Abstract
In this study, superheated steam at atmospheric pressure was used for the drying of masson pine ( Pinus mas⁃soniana Lamb.) lumber, and the effects of the superheated steam temperature on the drying rate, mechanical properties, dimensional stability and microstructure of the dried wood was investigated. The results showed that the superheated steam drying improved the drying rate, increased the modulus of elasticity ( MOE) and modulus of rupture ( MOR) , and decreased the dimensional stability. With an increase in superheated steam temperature from 120 ℃ to 130, 140 and 150 ℃, the drying rate were increased from 0�14%/min to 0�18, 0�19 and 0�20%/min (α<0�01) , respectively. The MOR significantly increased by 29�90, 32�59 and 37�87 MPa, and MOE increased by 2 275, 901 and 780 MPa at steam temperature of 120, 130 and 140℃, respectively. However, when the drying temperature was 150℃, the lowest mechanical strength was obtained and also numerous internal checks were observed. Compared with the conventionally dried wood, the higher water absorption was obtained in superheated steam⁃dried specimens, the reduced dimensional stability was showed as increased tangential swelling ( TS) , radial swelling( RS) and volume swelling( VS) for 20.89%, 19�18% and 40�26%, while the improved dimensional stability was obtained as decreased TS, RS and VS for 20�51%, 12�58% and 16�10%, respectively. Due to the high temperature of the superheated steam, the broken pits and unfilled resin canals improved the permeability of the wood, thereby enhancing the drying rate and the water absorption capability.关键词
过热蒸汽干燥/马尾松/干燥速率/力学强度/尺寸稳定性/微观构造Key words
superheated steam drying/masson pine(Pinus massoniana Lamb.)/drying rate/mechanical properties/dimensional stability/microstructure分类
农业科技引用本文复制引用
程曦依,李贤军,贺霞,李芸,熊幸阳,谢杰,全鹏..过热蒸汽温度对马尾松干燥速率和力学性能的影响[J].林业工程学报,2016,1(6):51-57,7.基金项目
国家林业局“948”项目（2014－4－50）；“十二五”国家科技支撑计划课题（2015BAD14B01）。 （）
