| 摘要 |
A heat exchange device for controlling the temperature of a resin after leaving an extruder and prior to extrusion through a die in an extrusion process, includes a heat exchanger (10) having an inlet (14) and outlet (16) for a heat- plastified resin and an inlet (32) and an outlet (36) for a heat exchange medium (e.g. oil or water). A selective heater (20) receives the medium from the exchanger (10) and heats it to a predetermined temperature during a start-up phase. A cooler (22) receives a portion of the medium from the heater and circulates a cooling medium in heat exchanging relationship with the heat exchange medium. Control means (42) directs a portion of the heat exchange medium to said cooler (22), in response to the temperature of the resin leaving the exchanger (10), and the balance of the medium to the exchanger (10). A pump (24) for circulates the medium between the heat exchanger (10), the heater (20), the cooler (22) and the control means (42). <IMAGE> |
