Multilayer tubular extrusion die

Plastic article or earthenware shaping or treating: apparatus – Means feeding fluent stock from plural sources to common... – Extrusion shaping means

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Details

425380, 425462, 425467, B29D 2304

Patent

active

041826035

ABSTRACT:
A coextrusion die for extruding multilayer thermoplastic material in the form of a tube. The die is of the type known as a spiral mandrel die wherein the die mandrels are provided with helical grooves on their peripheries. At least one spiral mandrel has helical grooves of opposite hand than those of the remaining mandrels.

REFERENCES:
patent: 3281897 (1966-11-01), Mercer
patent: 3649143 (1972-03-01), Papesh et al.

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