Continuous production of cross-linked polyethylene

Details Continuous production of cross-linked polyethylene Continuous production of cross-linked polyethylene

1978-05-30

1979-05-22

Schulz, William E.

Plastic article or earthenware shaping or treating: apparatus

Distinct means to feed, support or manipulate preform stock...

Extrusion shaping means

264170, 425122, 425376B, B29D 2304

Patent

active

041556909

ABSTRACT:
Cross-linked polyethylene is continuously produced by injecting dicumyl peroxide (Dicup) into the polyethylene in the mixing barrel of the extruder. The Dicup injection nozzle extends into the flight of the screw of the extruder and the flight is interrupted, or notched, at this position. This enables the Dicup to be injected at a position about half way between the extruder barrel wall and the core of the screw and also avoids pulsed back-pressure on the feed pump for the Dicup. A closely controlled and constant ratio of cross-linking agent to raw polyethylene is obtained.

REFERENCES:
patent: 3453356 (1969-07-01), Kent et al.
patent: 3577588 (1971-05-01), Chisholm
patent: 3981649 (1976-09-01), Shimano et al.
patent: 4069286 (1978-01-01), Greenhalgh
patent: 4091064 (1978-05-01), Kakinuma et al.

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