Effect of steam pretreatment on wood moisture content and characteristics of vacuum drying |
| |
Authors: | PENG Yi-qing LI Fan YANG Fei YI Song-lin |
| |
Institution: | College of Materials Science and Technology, Beijing Forestry University, Beijing 100083, P.R.China |
| |
Abstract: | The effects of high temperature steam pretreatment on the change in wood moisture content (MC) and characteristics of vacuum drying were investigated in this study. Poplar and manchurian walnut woods were pretreated with high temperature steam at 100°C and 140°C, prior to vacuum drying. A comparison of the characteristics of vacuum drying between steam pretreated wood and untreated wood was carried out. The results show that during steam pretreatment, the MC of wood decreased within a few hours. The reduction of MC varied with the temperature; the higher the temperature, the faster the MC dropped. During the vacuum drying stage, the rates of drying of pretreated samples were higher than those of untreated samples when MC was below the fiber saturation point. Furthermore, the total drying time of samples treated at a steam temperature of 140°C was lower than that of untreated samples. Therefore, a vacuum procedure after steam pretreatment can effectively shorten the drying time when drying wood. |
| |
Keywords: | steam pretreatment moisture content vacuum drying fiber saturation point |
本文献已被 CNKI 维普 万方数据 SpringerLink 等数据库收录! |
| 点击此处可从《中国林学》浏览原始摘要信息 |
| 点击此处可从《中国林学》下载免费的PDF全文 |
|