It is well known that vacuum drying is to put raw material to the state of vacu um for heating and drying.If use vacuum to take air and humidity out,the dry spee d will be faster.

• 所谓真空干燥，就是将干燥物料处在真空条件下，进行加热干燥，如果利用真空泵进行抽气抽湿，则加快了干燥速率。