Extrusion screw for extruder

Details Extrusion screw for extruder Extrusion screw for extruder

1996-08-23

1997-12-16

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

With separate and distinct upstream agitating or kneading means

Within pressurizing chamber

26421121, 366 81, 366 88, 366 89, B29C 4762

Patent

active

056982356

ABSTRACT:
An extrusion screw (13) for an extruder (11) includes a screw shaft (24 ) which is rotatably arranged in a cylinder barrel (12). A main flight (25) and an auxiliary flight (26) are helically provided on the outer peripheral surface of the screw shaft (24). The trailing ends (25a, 26a) of these flights (25, 26) are spaced from each other by a half turn in the circumferential direction (A) of the screw shaft (24). A main flight groove (32) is formed between the front wall surface (27) of the main flight (25) and the rear wall surface (29) of the auxiliary flight (26). An auxiliary flight groove (31) is formed between the front wall surface (28) of the auxiliary flight (26) and the rear wall surface (30) of the main flight (25) to have a second cross-sectional area. The cross-sectional area of the auxiliary flight groove (31) decreases in a direction from the leading end (26b) to the trailing end (26a) of the auxiliary flight (26).

REFERENCES:
patent: 2627089 (1953-02-01), Norwood
patent: 3702512 (1972-11-01), Schippers et al.
patent: 3897938 (1975-08-01), Kim
patent: 4384837 (1983-05-01), Murai et al.
patent: 4896969 (1990-01-01), Dray
patent: 5063016 (1991-11-01), Bauer et al.
SPIREX Literature, Screw and Barrel Technology, Youngstown, Ohio, pp. 3-42, 1985.

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