Effects of micro-wave frequency and equivalent thickness of plaster mold on micro-wave drying process have been approached

and which was co mpared with that by conventional oven drying process.The results show that the increase of micro-wave frequency can increase the rate of loss water and shorten drying time.Although the equivalent thickness of plaster mold has somewhat effects on drying time

it has greatly effect on the rate of loss water of plaster mold.The rate of loss water of plaster mold can be fasted with the increase of equivalent thickness.It is need about 1.5 hours for drying plaster mold by microwave to 100% loss water rate while it is need about 30 hours by conventional oven drying method.The drying efficiency of microwave is improved by 20 times

however

the tensile strength of the plaster is lower than that by conventional oven drying.