Co-extrusion die

Details Co-extrusion die Co-extrusion die

1986-03-21

1987-08-18

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

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

Extrusion shaping means

2642098, 425380, 425462, B29C 4706

Patent

active

046874305

ABSTRACT:
A co-extrusion die can simultaneously extrude different extrudate into a multilayer tube. The die has a plurality of mandrels and a casing having an inlet side and an outlet side. The mandrels are coaxially nested in the casing. This casing is shaped on the interior of its outlet side to mate with the mandrels and provide an annular outlet. The casing and the mandrels are positioned and shaped to provide a plurality of interspaces. At least one of the interspaces is shaped to define an annular passage. Another interspace is shaped to define a spiral passage. These annular and spiral passages communicate with the annular outlet.

REFERENCES:
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patent: 3957566 (1976-05-01), Rahlfs
patent: 4042661 (1977-08-01), Cook
patent: 4045154 (1977-08-01), Ratheiser
patent: 4182603 (1980-01-01), Knittel
patent: 4185954 (1980-01-01), Murakami et al.
patent: 4207045 (1980-06-01), Rasmussen
patent: 4226822 (1980-10-01), Yoshikawa et al.
patent: 4359354 (1982-11-01), Bohm
patent: 4504210 (1985-03-01), Titz et al.
patent: 4522775 (1985-06-01), Briggs et al.

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