林业工程学报2017，Vol.2Issue(1)：15-19,5.DOI:10.13360/j.issn.2096-1359.2017.01.003
大果紫檀等3种红木薄板的高频真空干燥
Study on radio-frequency vacuum drying of three rosewood thin boards
摘要
Abstract
Rosewood is widely accepted by consumers as one of the most desirable materials in high valued wooden products due to its properties, wood culture and sense of touch. High valued rosewood furniture and crafts are wide⁃spread in China. However, the defects such as discoloration, crisp and cracks occurred during conventional kiln ( CK) drying due to its high density and tight structure limit its utilization. Furthermore, the long CK drying periods also cause problems for the rosewood furniture manufacturing. Therefore, to obtain high drying quality of rosewood in short time, a new drying technology, radio⁃frequency/vacuum ( RF/V) , was introduced to the wood⁃drying industry. The RF/V drying combined with fast radio⁃frequency heating and low boiling point of water under vacuum conditions, which can dry wood with high rate and high quality. It has significant advantages for the drying of large dimension or high valued wood. In this study, to solve the drying defects resulted from the conventional kiln drying, RF/V and CK drying devices was used. Three rosewood species ( Pterocarpus macrocarpus, Dalbergia latifolia, Dal⁃bergia bariensis) were dried at the same temperature with RF/V and CK schedules. The wood quality such as the final moisture contents ( MC) distributions, cracks, discoloration, as well as the drying rate after drying were compared. The results showed that there were no cracks on ends, surface and inner of boards, the MC was even for all boards and the wood quality after the RF/V drying can meet the requirements of the grade 2 of GB/T 6491-2012. The aver⁃age moisture content after the drying can meet the requirements of furniture factories and crafts manufacturers. The dis⁃coloration of RF/V was less compared with that of CK drying because of rare air in the drying chamber. The drying rate of RF/V was faster compared with that of CK drying due to the easy moisture moving resulted from the fast RF heating and low chamber pressure. The RF/V drying can improve drying rate, drying quality and efficiency for the dr⁃ying of rosewood thin boards, which is an effective method for the drying of high valued species of rosewood.关键词
红木/高频真空干燥/干燥质量/干燥速度Key words
rosewood/radio-frequency/vacuum drying/drying quality/drying rate分类
农业科技引用本文复制引用
刘洪海,杨琳,吴智慧,蔡英春,李兴畅..大果紫檀等3种红木薄板的高频真空干燥[J].林业工程学报,2017,2(1):15-19,5.基金项目
国家自然科学基金项目（31570558，31500479）；中国博士后基金面上项目（2015M581805）；江苏高校优势学科建设工程资助项目（ PAPD）；江苏省“青蓝工程”资助项目。 （）
