Serial two-stage extruder

Details Serial two-stage extruder Serial two-stage extruder

1993-11-01

1995-02-28

Bushey, Charles S.

Plastic article or earthenware shaping or treating: apparatus

With separate and distinct upstream agitating or kneading means

Serially arranged chambers each housing a kneading or mixing...

366 83, 366 91, 4253781, B29C 4700

Patent

active

053932137

ABSTRACT:
In a serial two-stage extruder, the first-stage extruder has a screw including a feed screw section having a length within a range of 5 to 9 the major diameter thereof, a mixing screw section having a hexagonal cross section and a pitch of 1 to 3 times the major diameter thereof, and a metering screw section having a screw groove of an appropriate depth. The second-stage extruder includes an extruding screw and a barrel. The extruding screw has a screw groove of an appropriate depth and a dulmage formed at the tip end of the screw. The dulmage has a plurality of fins cooperating with fins of the barrel. Alteratively, in the second-stage extruder, the dulmage may have a plurality of axially spaced stages of fins. Configurations of the fins in each respective stage are identical but various characteristics of the fins vary from stage to stage. In this case, the barrel does not have fins.

REFERENCES:
patent: 2453088 (1948-11-01), Dulmage
patent: 2702410 (1955-02-01), Brown
patent: 3331101 (1967-07-01), Thomas, Jr.
patent: 4336213 (1982-06-01), Fox
patent: 5283074 (1994-02-01), Campbell
Schenkel, "Kunststoff-Extrudertechnik", 2nd edition, Carl Hanser Verlag Munich (publisher), 1963, pp. 52-53.

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