Hollow extrusion using internal coolant

Details Hollow extrusion using internal coolant Hollow extrusion using internal coolant

1997-02-04

2000-02-01

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

264560, 264150, 2642091, 264237, 425 71, B29C 4778

Patent

active

060199342

ABSTRACT:
The process according to the invention for producing large-bore thick-walled pipes made of polyethylene comprises extruding the polymer composition out of an annular die 3 and subsequently cooling the melt 7 emerging from the die 3 using water as the coolant from the outside, the melt 7 emerging from the die being additionally also cooled with water from the inside. In order to ensure the internal cooling, according to the invention floating plugs 11 and 12 are inserted, which plugs are fixed in their physical position relative to the extrusion die 3 by means of retaining elements.

REFERENCES:
patent: 3784345 (1974-01-01), Wissinger et al.
patent: 4088724 (1978-05-01), Kuhnert
patent: 4750873 (1988-06-01), Loe et al.
patent: 4867669 (1989-09-01), Da Silva et al.
patent: 5261988 (1993-11-01), Dikis et al.
patent: 5422063 (1995-06-01), Pelzer

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