Patent ID: 7384608

Claim:
A batchwise heating apparatus which heats Polymer particles in a rotating hermetically sealed vessel in an atmosphere of inert gas or under reduced pressure, and which comprises a vessel fixed to a temperature detection portion capable of measuring temperature in the vessel during rotating and a suction/exhaust port inside the vessel capable of reducing pressure and/or replacing with inert gas even during rotating, by a suction/exhaust pipe that is inserted into the vessel so as to communicate with said suction/exhaust port, wherein the vessel is supported with a bearing on a driving side thereof and a bearing on the opposite side thereof to the driving side, said opposite side including another suction/exhaust pipe that is connected with an inert gas introduction device and/or vacuum generator, and with said suction/exhaust pipe inserted into the bearing on the opposite side of the driving side, and wherein a rotational sealing portion of said suction/exhaust pipe is installed on the outside of said vessel.