Method and apparatus for controlling rotary extruder

Details Method and apparatus for controlling rotary extruder Method and apparatus for controlling rotary extruder

1989-10-24

1991-09-03

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Positioning of a mold part to form a cavity or controlling...

222 55, 222 63, 264 407, 264349, 366 99, 366132, 366151, 366182, 425135, 425145, 425190, 425207, 4253823, B29C 4700, B29C 4736, B29C 4792

Patent

active

050452525

ABSTRACT:
Method and apparatus for automatically controlling the operation of a rotary extruder, including using a pressure transducer (38, 40, 42) communicating with the annular space (50) between the barrel (12) and rotor (14) to monitor the hydraulic pressure of the melted polymer, using a microprocessor-based controller (62) to compare the measured pressure with a predetermined set point, and thereafter selectively controlling the speed of a feed drive motor (56) or melt drive motor (60) to maintain the melt pressure within a desired range while holding the extruder rotor speed constant.

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