Method and apparatus for extrusion of plastic pipes with composi

Details Method and apparatus for extrusion of plastic pipes with composi Method and apparatus for extrusion of plastic pipes with composi

1986-12-16

1988-11-08

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Layered, stratified traversely of length, or multiphase...

29467, 264541, 2642098, 4251331, 425381, 425462, 425467, B29C 4722

Patent

active

047832991

ABSTRACT:
A central body portion has first, second and third concentric cylinders of successively increasing diameter encircling the central body portion and each other in spaced relationship to form three concentric annular spaces for receiving molten material. Only one end of each of the first, second and third cylinders and the body portion are rigidly attached to each other so as to maintain the rigid spaced relationship. A mandrel is attached to the outer end of the central body portion and a die is attached to the outer end of the outer most concentric cylinder in spaced relationship to the mandrel to shape the molten material into a pipe having a multi-layered wall.

REFERENCES:
patent: 3856448 (1974-12-01), Iijima et al.
patent: 3966861 (1976-06-01), Papesh et al.
patent: 4111630 (1978-09-01), Shiomi et al.
patent: 4185954 (1980-01-01), Murakami et al.
patent: 4208175 (1980-06-01), Rosenbaum
patent: 4249875 (1981-02-01), Hart et al.
patent: 4281981 (1981-08-01), Feldman
patent: 4364882 (1982-12-01), Doucet
patent: 4499041 (1985-02-01), Hahn et al.

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