Method and appparatus for monitoring and controlling thermoplast

Details Method and appparatus for monitoring and controlling thermoplast Method and appparatus for monitoring and controlling thermoplast

1990-04-30

1992-06-16

Tentoni, Leo S.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 404, 264 407, 364473, 364567, 364568, 366141, 425140, 425148, B29C 4710, B29C 4792

Patent

active

051223155

ABSTRACT:
In a gear pump assisted thermoplastic extrusion system, the speed of operation of the gear pump is adjusted in relation to fluctuations in both the rate of product output from the system and the rate of material input to the system to precisely maintain a desired weight per unit length of the extruded product within close tolerances.

REFERENCES:
patent: 4013745 (1977-03-01), Brinkmann et al.
patent: 4101613 (1978-07-01), Norwood
patent: 4209476 (1980-06-01), Harris
patent: 4452750 (1984-06-01), Handwerk et al.
patent: 4478775 (1984-10-01), Endo et al.
patent: 4501498 (1985-02-01), McKelvey
patent: 4663103 (1987-05-01), McCullough et al.
patent: 4944903 (1990-07-01), Nilsson
Paper by Daniel J. Smith and Dana G. Darley "Making The Right Choice: Gear Pumps or Gravimetric Extrusion Control" (Oct. 1989).
Article by Debbie Stover, "Gravimetric Control for Extrusion Lines Crosses the Atlantic" (May 1989).

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