@Article{jrm.2026.02026-0092,
AUTHOR = {Junbo Cheng, Zhengmin Jin, Zhipeng Zhu, Yingchun Cai, Jingyao Zhao},
TITLE = {Drying Characteristics of Mongolian Scots Pine (<i>Pinus sylvestris</i> var. <i>mongolica)</i> Square Timber under Different High-Temperature Drying-Set Treatments},
JOURNAL = {Journal of Renewable Materials},
VOLUME = {},
YEAR = {},
NUMBER = {},
PAGES = {{pages}},
URL = {http://www.techscience.com/jrm/online/detail/28141},
ISSN = {2164-6341},
ABSTRACT = {To investigate the effects of different high-temperature drying-set treatment processes on the drying characteristics of 120 mm thick Scots pine (<i>Pinus sylvestris</i> var. <i>mongolica</i>) square timber, six drying schedules were designed. Temperature and moisture content distribution, drying rate, checking behavior, and residual stress variations were measured and analyzed. The results showed that a surface temperature exceeding 100°C during the drying-set stage was essential for promoting effective surface shrinkage and forming a stable drying-set layer. The 105°C treatment failed to achieve this condition, resulting in severe surface checking. In contrast, the 120°C treatment provided suitable conditions for forming a stable drying-set layer. Among the investigated schedules, the schedule with a drying-set temperature of 120°C and a duration of 10 h exhibited the lowest surface-checking area. Although the surface temperature exceeded 100°C under the 135°C treatment, the heating rate of the surface layer increased with treatment duration (reaching a maximum of approximately 12.5°C/h), resulting in an increased temperature difference between the surface and interior layers and an elevated risk of surface checking. After drying, the residual stress of the high-temperature drying-set treated groups was reduced by 72.41%–86.89% compared with the control group. Among the investigated drying schedules, the schedule involving saturated steam softening at 95°C for 12 h followed by drying-set treatment at dry-bulb/wet-bulb temperatures of 120°C/90°C for 10 h exhibited the best overall performance. This schedule reduced the drying cycle to 5.9 d, representing a reduction of 9.23%–52.80% compared with the other schedules. It also produced a residual stress of 0.29%, and a surface checking area of 51.69 mm<sup>2</sup>, corresponding to reductions of 56.85%–88.04% relative to other schedules. These findings provide new insights into moisture migration and stress evolution during high-temperature drying-set treatment, supporting the optimization of drying strategies for large-section wood products.},
DOI = {10.32604/jrm.2026.02026-0092}
}