Screw tip for closing a temperature-control bore of an extruder

Details Screw tip for closing a temperature-control bore of an extruder Screw tip for closing a temperature-control bore of an extruder

1998-12-17

2000-08-15

Cooley, Charles E.

Agitating

Rubber or heavy plastic working

Stirrer is through-pass screw conveyor

366147, 425192R, 4253781, B29B 782

Patent

active

061025607

ABSTRACT:
An extruder screw, includes a head portion having a front end and having formed therein a temperature-control bore and a counterbore extending the bore to the front end for supply and drainage of a fluid. A locking screw has a screw thread, with a first section of the screw thread received in the bore and a second section of the screw thread extending in the counterbore and projecting out of the head portion. The extruder screw further includes a screw tip which threadably engages the second section of the screw thread to close off the extruder screw, and a sealing member which is received in a counterbore of the head portion, wherein the locking screw is so configured as to apply a substantial force against the sealing member when engaging the locking screw into the bore, to thereby effectively seal the bore.

REFERENCES:
patent: 2622469 (1952-12-01), Gray
patent: 2653348 (1953-09-01), Elgin et al.
patent: 2688770 (1954-09-01), Henning
patent: 3698694 (1972-10-01), Zeug et al.
patent: 3870451 (1975-03-01), Gokcen
patent: 4243629 (1981-01-01), Tramezzani
patent: 4477242 (1984-10-01), Eichlseder et al.
patent: 4530605 (1985-07-01), Eichlseder et al.
patent: 4697928 (1987-10-01), Csongor
patent: 4734240 (1988-03-01), Chung et al.
patent: 5843489 (1998-12-01), Nakano

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