| 主权项 |
1. A heater-cooler system for a barrel extruder, comprising:
a plurality of heaters in thermal communication with at least a portion of a barrel of an extruder; a plurality of shroud assemblies, each of the plurality of shroud assemblies defining a cavity between one of the plurality of shroud assemblies and one of the plurality of heaters, each of the plurality of heaters being enclosed by one of the plurality of shroud assemblies, each of the plurality of shroud assemblies having an intake port and an exhaust port, and each of the plurality of shroud assemblies being mounted to a respective one of the plurality of heaters; a blower connected to the intake port and being in fluid communication with the cavity, the blower being operable to deliver air to the cavity when the blower is operated; a portion of the each of the plurality of shroud assemblies at the exhaust port defining a flap moveably integrated therewith, the flap being configured to be opened by an increase in pressure in the cavity caused by operation of the blower so that the cavity is in fluid communication with an area outside of the cavity and outside of the plurality of shroud assemblies and the flap substantially sealing the cavity in a closed position upon termination of blower operation; and the flap being a poppet valve defining a disc slidingly engaging a shaft secured to the exhaust port. |
