Effects of microwave pretreatment on drying of 50 mm-thickness Chinese fir lumber
Abstract Low permeability of wood causes problems during drying of timber. This study evaluated the effects of microwave (MW) pretreatment on the conventional drying behavior and mechanical damages of Chinese fir lumber. MW pretreatment of lumber was performed at applied MW energy of 43 kWh/m3, and...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2021-02-01
|
| Series: | Journal of Wood Science |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s10086-021-01942-2 |
| _version_ | 1818413214398939136 |
|---|---|
| author | Xiang Weng Yongdong Zhou Zongying Fu Xin Gao Fan Zhou Jinghui Jiang |
| author_facet | Xiang Weng Yongdong Zhou Zongying Fu Xin Gao Fan Zhou Jinghui Jiang |
| author_sort | Xiang Weng |
| collection | DOAJ |
| description | Abstract Low permeability of wood causes problems during drying of timber. This study evaluated the effects of microwave (MW) pretreatment on the conventional drying behavior and mechanical damages of Chinese fir lumber. MW pretreatment of lumber was performed at applied MW energy of 43 kWh/m3, and then, the samples were dried in a laboratory drying kiln. The results showed that the drying rate was effectively increased after MW pretreatment. The moisture content (MC) deviation in thickness and residual stress indexes of MW-pretreated samples were significantly decreased in comparison with the control samples, and the appearance quality of wood samples was not clearly affected by the MW pretreatment. Scanning electron microscope (SEM) micrographs demonstrated that pit membranes were damaged after MW pretreatment, and the micro-cracks in radial section as well as detachments between ray parenchyma cells and tracheids were also observed. Consequently, new pathways for moisture migration during drying process were formed after MW pretreatment, which contributed to the improved permeability of Chinese fir lumber and decreased drying time. |
| first_indexed | 2024-12-14T10:59:39Z |
| format | Article |
| id | doaj.art-8d4bfee6e96b45a8968bb6d556e9f907 |
| institution | Directory Open Access Journal |
| issn | 1435-0211 1611-4663 |
| language | English |
| last_indexed | 2024-12-14T10:59:39Z |
| publishDate | 2021-02-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of Wood Science |
| spelling | doaj.art-8d4bfee6e96b45a8968bb6d556e9f9072022-12-21T23:04:46ZengSpringerOpenJournal of Wood Science1435-02111611-46632021-02-016711910.1186/s10086-021-01942-2Effects of microwave pretreatment on drying of 50 mm-thickness Chinese fir lumberXiang Weng0Yongdong Zhou1Zongying Fu2Xin Gao3Fan Zhou4Jinghui Jiang5Research Institute of Wood Industry, Chinese Academy of ForestryResearch Institute of Wood Industry, Chinese Academy of ForestryResearch Institute of Wood Industry, Chinese Academy of ForestryResearch Institute of Wood Industry, Chinese Academy of ForestryResearch Institute of Wood Industry, Chinese Academy of ForestryResearch Institute of Wood Industry, Chinese Academy of ForestryAbstract Low permeability of wood causes problems during drying of timber. This study evaluated the effects of microwave (MW) pretreatment on the conventional drying behavior and mechanical damages of Chinese fir lumber. MW pretreatment of lumber was performed at applied MW energy of 43 kWh/m3, and then, the samples were dried in a laboratory drying kiln. The results showed that the drying rate was effectively increased after MW pretreatment. The moisture content (MC) deviation in thickness and residual stress indexes of MW-pretreated samples were significantly decreased in comparison with the control samples, and the appearance quality of wood samples was not clearly affected by the MW pretreatment. Scanning electron microscope (SEM) micrographs demonstrated that pit membranes were damaged after MW pretreatment, and the micro-cracks in radial section as well as detachments between ray parenchyma cells and tracheids were also observed. Consequently, new pathways for moisture migration during drying process were formed after MW pretreatment, which contributed to the improved permeability of Chinese fir lumber and decreased drying time.https://doi.org/10.1186/s10086-021-01942-2Microwave pretreatmentChinese firDrying ratePermeability |
| spellingShingle | Xiang Weng Yongdong Zhou Zongying Fu Xin Gao Fan Zhou Jinghui Jiang Effects of microwave pretreatment on drying of 50 mm-thickness Chinese fir lumber Journal of Wood Science Microwave pretreatment Chinese fir Drying rate Permeability |
| title | Effects of microwave pretreatment on drying of 50 mm-thickness Chinese fir lumber |
| title_full | Effects of microwave pretreatment on drying of 50 mm-thickness Chinese fir lumber |
| title_fullStr | Effects of microwave pretreatment on drying of 50 mm-thickness Chinese fir lumber |
| title_full_unstemmed | Effects of microwave pretreatment on drying of 50 mm-thickness Chinese fir lumber |
| title_short | Effects of microwave pretreatment on drying of 50 mm-thickness Chinese fir lumber |
| title_sort | effects of microwave pretreatment on drying of 50 mm thickness chinese fir lumber |
| topic | Microwave pretreatment Chinese fir Drying rate Permeability |
| url | https://doi.org/10.1186/s10086-021-01942-2 |
| work_keys_str_mv | AT xiangweng effectsofmicrowavepretreatmentondryingof50mmthicknesschinesefirlumber AT yongdongzhou effectsofmicrowavepretreatmentondryingof50mmthicknesschinesefirlumber AT zongyingfu effectsofmicrowavepretreatmentondryingof50mmthicknesschinesefirlumber AT xingao effectsofmicrowavepretreatmentondryingof50mmthicknesschinesefirlumber AT fanzhou effectsofmicrowavepretreatmentondryingof50mmthicknesschinesefirlumber AT jinghuijiang effectsofmicrowavepretreatmentondryingof50mmthicknesschinesefirlumber |