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Influence of temperature and vacuum level on the drying rate, moisture content distribution, wood color and drying stress of rubberwood in vacuum drying

文献类型： 外文期刊

作者： Yang, Lin 1 ; Liu, Xuanjiang 1 ; Li, Tongtong 3 ; Li, Jianing 3 ;

作者机构： 1.Nanjing Forestry Univ, Jiangsu Coinnovat Ctr Efficient Proc & Utilizat Fo, Nanjing 210037, Peoples R China

2.Nanjing Forestry Univ, Coll Furnishings & Ind Design, Nanjing 210037, Peoples R China

3.Chinese Acad Trop Agr Sci, Rubber Res Inst, Haikou, Peoples R China

关键词： Rubberwood; vacuum drying; drying rate; color; drying stress

期刊名称：WOOD MATERIAL SCIENCE & ENGINEERING （ 影响因子：2.1； 五年影响因子：2.3 ）

ISSN： 1748-0272

年卷期： 2025 年

页码：

收录情况： SCI

摘要： Rubberwood, a fast-growing material for furniture and construction, is prone to cracking, deformation, and discoloration during traditional kiln drying, reducing its utility and appearance. Vacuum drying helps release internal stress, maintain color, and improve stability. This study compared six vacuum drying conditions for pith rubberwood, examining drying performance and color changes under varying temperatures and pressures. Drying rates ranged from 0.21%/h (40 degrees C, 0.04 MPa) to 0.92%/h (80 degrees C, 0.02 MPa), a 4.4-fold difference. Temperature had a greater impact; at 0.02 MPa and 0.04 MPa, raising the temperature from 40 degrees C to 80 degrees C increased drying rates by 4.18 and 3.76 times, respectively. The vacuum level and temperature interactively affect longitudinal uniformity, moisture content (M) deviation in thickness ranges from 1.37% (0.04 MPa, 40 degrees C) to 2.98% (0.04 MPa, 80 degrees C), a 2.2-fold increase, with higher vacuum levels reducing M gradients. M deviation ranged from 1.37% (40 degrees C, 0.04 MPa) to 2.98% (80 degrees C, 0.04 MPa), a 2.2 - fold difference. Color change was more affected by vacuum. The best color preservation was at 0.02 MPa and 80 degrees C, and the worst at 0.04 MPa and 40 degrees C. Temperature more strongly influenced residual stress, while wood shrinkage was significantly affected by both vacuum and temperature.

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