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Internal heating screw Cone vacuum dryer is a screw belt to the material rotation of the lifting and conical jacket, hollow screw in the same time into the heat transfer medium (such as hot water, heat conduction oil, steam, etc.), so that after heating material from the surrounding lifting and falling from the inside, fast and continuous cycle of turnover, and through the cylinder in a vacuum to remove the water The material is dried and mixed for a short period of time.