Extrusion die assembly for high density products

Details Extrusion die assembly for high density products Extrusion die assembly for high density products

2009-04-08

2009-11-03

Davis, Robert B (Department: 1791)

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...

C425S208000, C425S38200R, C425S382200, C425S464000, C426S516000

Reexamination Certificate

active

07611347

ABSTRACT:
High-capacity extrusion die assemblies (20, 90, 130, 140, 180, 252) each having a tubular sections (44, 146, 162, 268) and an elongated, axially rotatable, helically flighted screw section (56, 56a, 152, 168, 276, 278) which cooperatively define frustoconical, outwardly diverging material flow paths (75, 160, 291) at constant or differing divergence angles of from about 1-11°. The use of diverging tubular sections (44, 146, 162, 268) and screw sections (56, 56a, 152, 168, 276, 278) permits the use of larger die plates (76, 118, 292) with an increased number of die openings (80, 124, 296). This allows significant increases in extrusion production rates. The die assemblies (20, 90, 130, 140, 180, 252) can be used in the production of a wide number of human foods or animal feeds, and particularly aquatic feeds of the floating or sinking variety. In another aspect of the invention, an extruder (210) is provided having diverging and converging sections (212, 214) along the length thereof and defining corresponding flow paths (230, 246).

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