Co-extrusion apparatus and method for producing multiple-layered

Details Co-extrusion apparatus and method for producing multiple-layered Co-extrusion apparatus and method for producing multiple-layered

1978-09-15

1981-02-10

Lowe, James B.

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

Extrusion shaping means

425380, 425462, B29D 2304, B29D 900

Patent

active

042498759

ABSTRACT:
A melt extrusion process and apparatus for producing a multiple-layered pipe (preferably of two or more thermoplastic resins) are disclosed. The process comprises extruding a cylindrical stream of thermoplastic material, converting the cylindrical stream to an annular stream, applying at least one inner annular layer of thermoplastic to the inner surface of the annular stream, applying at least one outer annular layer of thermoplastic material to the annular stream, and extruding the resultant multiple-layered annular stream. Apparatus for producing this pipe includes a modular pipe die having inside and outside laydown means, flow equalizing means within each of the inner and outer laydown means to obviate layer imperfections, and adjustable means to control the concentricity of the outer layers. The invention finds particular application in the production of a thermoplastic pipe having an intermediate expanded core.

REFERENCES:
patent: 2501690 (1950-03-01), Prendergast
patent: 2632205 (1953-03-01), Harris
patent: 3308508 (1967-03-01), Schrenk
patent: 3423498 (1969-01-01), Lefevre
patent: 3819792 (1974-06-01), Ono et al.
patent: 4061461 (1977-12-01), Hessenthaler
patent: 4125585 (1978-11-01), Rosenbaum
patent: 4134952 (1979-01-01), Yoshikawa et al.

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