Screw extruder

Details Screw extruder Screw extruder

1985-08-15

1987-07-07

Simone, Timothy F.

Agitating

Rubber or heavy plastic working

With specified feed means

366 77, 366 79, B29F 301, B29F 302

Patent

active

046783393

ABSTRACT:
Disclosed is a screw extruder comprising a feed bush having a screw extruder coaxially mounted therein, and which, around its circumference, is provided with several longitudinally extending grooves distributed evenly in the circumferential direction. Adapters are disposed in the grooves which can be adjusted radially in the grooves relative to the extruder screw with the aid of adjustment mechanisms. Each adapter is connected to several bolts connected over the length of the adapter. The bolts pass through holes in the feed bush and are surrounded by helical springs, each of which is supported on the one side against a collar of the bolt and on the other side against a face of the hole. The bolts are of one-piece or two-piece design and may include at the outer bolt ends, rollers which are pressed against cam rings or a cam segment, which surround the extruder barrel in annular or semi-annular shape. The adjustment mechanisms adjust the cam rings or the cam segment and thus, through the bolt, the adapters in the grooves. The adapters may be adjusted in the grooves parallel or inclined to the inner circumferential surface of the feed bush. Also disclosed is a method for controlling extrusion in a screw extruder.

REFERENCES:
patent: 4439041 (1984-03-01), Schaeffer et al.
patent: 4462692 (1984-07-01), Meyer
patent: 4494877 (1985-01-01), Upmeier et al.

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