Plastic pipe extrusion

Details Plastic pipe extrusion Plastic pipe extrusion

1980-07-22

1982-02-09

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Of varying cross-sectional area or with intermittent...

264178R, 2642094, 264237, 264342RE, 425325, 425379R, 425380, 425393, 425465, 425467, B29D 2304, B29F 308

Patent

active

043149588

ABSTRACT:
By expanding a plastic pipe while it is still hot and expandable and thereafter shrinking the so-expanded pipe to a defined point of shrinkage where the pipe is cooled, e.g., by a water spray, it is possible to produce pipes of any diameter within a range using only one extruder die orifice. The expansion and shrinking is carried out using a double cone external mandrel. The process of the invention has the advantage of allowing the production of plastic pipe of any diameter specified by a customer without having to change the die orifice of the extruder.

REFERENCES:
patent: 2708772 (1955-05-01), Moncrieff
patent: 3057013 (1962-10-01), Loveless
patent: 3184792 (1965-05-01), Commisso
patent: 3249671 (1966-05-01), Perrone
patent: 3295166 (1967-01-01), Owings
patent: 3320637 (1967-05-01), Van Dijk
patent: 3393427 (1968-07-01), Larsen
patent: 3472923 (1969-10-01), Gerrard
patent: 3728424 (1973-04-01), Bauer
patent: 3752630 (1973-08-01), Takagi et al.
patent: 3963403 (1976-06-01), Hughes et al.
patent: 4137028 (1979-01-01), Reitemeyer et al.

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