Apparatus and method for controlling extrusion back pressure

Details Apparatus and method for controlling extrusion back pressure Apparatus and method for controlling extrusion back pressure

1982-07-21

1984-08-14

Thurlow, Jeffery R.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Feed control of material en route to shaping area

264 405, 264142, 425146, 425150, 425183, 425190, 425192R, 425198, 425309, 425310, 425313, 425376A, B29F 306

Patent

active

044654510

ABSTRACT:
An apparatus for controlling extrusion back-pressure in a face cutting apparatus having an extrudate feed means, a die and a cutter is provided. The apparatus consists of a pair of nested dies, one upstream and one downstream, each die having a plurality of areas, each of the areas having a plurality of extrusion orifices. The nested dies are movable relative to another. In one relative position, the orifices of the upstream die exactly aligned with the orifices of the downstream die. Means are provided for relative movement of the dies in response to a change in the pressure adjacent the extrudate delivery end.

REFERENCES:
patent: 3345854 (1967-10-01), Gross
patent: 3455357 (1969-07-01), Zink
patent: 3874835 (1975-04-01), Rossiter et al.
patent: 3912439 (1975-10-01), Newman
patent: 3973890 (1976-08-01), Porter et al.
patent: 4395212 (1983-07-01), Lambertus

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