Plastic extruder screw tip

Details Plastic extruder screw tip Plastic extruder screw tip

2006-02-14

2006-02-14

Cooley, Charles E. (Department: 1723)

Agitating

Rubber or heavy plastic working

Stirrer is through-pass screw conveyor

Reexamination Certificate

active

06997596

ABSTRACT:
A plastic extruder screw tip having a conical inwardly and forwardly tapering melt converging surface; having first and second dashers fixedly attached to and extending laterally outwardly from the melt converging surface, the dashers being opposingly arranged and having curved distal ends; the plastic extruder screw tip further having a helically threaded screw root mounting cylinder fixedly attached to and extending rearwardly from the melt converging surface, the screw root mounting cylinder having annular outer “O” ring seals nestingly received within “O” ring receiving channels, the screw root mounting cylinder further having an interior oil return conduit.

REFERENCES:
patent: 203284 (1878-05-01), McKenzie
patent: 3045283 (1962-07-01), Keiser
patent: 3942774 (1976-03-01), Sokolow
patent: 5501519 (1996-03-01), Miyauchi et al.
patent: 5573331 (1996-11-01), Lin
patent: 6206559 (2001-03-01), Kinoshita et al.
patent: 6299342 (2001-10-01), Eggen et al.
patent: 2003/0206482 (2003-11-01), Griggs
patent: 2005/0111294 (2005-05-01), Gates et al.
patent: 52-856 (1977-01-01), None

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