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Microwave-vacuum (MV) drying characteristics of plantation Masson pine (Pinus massoniana) were studied experimen-tally for various levels of microwave radiation time, initial moisture content (MC), vacuum level and wood thickness. The results show that the process of MV drying for wood can be significantly divided into a short accelerating rate drying period, a long constant rate drying period and falling rate drying period, and the second drying period can extend to levels of mean MC below the fiber satu-ration point. With the increase of initial MC and microwave radiation time, the drying rate of wood increases significantly. The vac-uum level affects the drying rate in a slightly positive way. Within the range of 2 to 6 cm, the effects of sample thickness on the dry-ing rate can be negligible.
Microwave-vacuum (MV) drying characteristics of plantation Masson pine (Pinus massoniana) were studied experimen- tally for various levels of microwave radiation time, initial moisture content (MC), vacuum level and wood thickness. The results show that the process of MV drying for wood can be divided into a short accelerating rate drying period, a long constant rate drying period and falling rate drying period, and the second drying period can extend to levels of mean MC below the fiber satu-ration point. With the increase of initial MC and microwave radiation time, the drying rate of wood increased significantly. The vac-uum level affects the drying rate in a slightly positive way. Within the range of 2 to 6 cm, the effects of sample thickness on the dry-ing rate can be negligible.