Process and an apparatus for the extrusion of plastic pipes with

Details Process and an apparatus for the extrusion of plastic pipes with Process and an apparatus for the extrusion of plastic pipes with

1980-05-08

1982-12-21

Anderson, Philip E.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 461, 264171, 2642094, 2642098, 4251331, 425325, 425462, B29D 2700

Patent

active

043648827

ABSTRACT:
The invention relates to a process and an apparatus for manufacturing plastic pipes having a composite structure by extrusion.
The material forming the inner and outer walls of the tube is introduced into a special heated and regulated distribution head and is separated into two distinct streams between which a filling material forming a first stream is injected. These three streams are brought together and placed in contact, thus forming a blank which is given its final dimensions by being passed into a conventional tool comprising a trefoil, die and mandrel, followed by a conformator.
Application to the manufacture of large dimension tubes for the disposal and drainage of sewage and rainwater.

REFERENCES:
patent: 2501690 (1950-03-01), Prendergast
patent: 3300554 (1967-01-01), Bachus
patent: 3609809 (1971-10-01), Slicker
patent: 3956438 (1976-05-01), Schippers
patent: 4054403 (1977-10-01), Hornbeck et al.

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