Extrusion die having elongated extrusion nozzle with facilitates

Details Extrusion die having elongated extrusion nozzle with facilitates Extrusion die having elongated extrusion nozzle with facilitates

1990-09-11

1992-06-23

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

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

Extrusion shaping means

264241, 425188, B29C 4726

Patent

active

051238276

ABSTRACT:
The invention concerns extrusion dies for apparatus for producing seamless thermoplastic tubing. An elongate hollow core is provided extending through a bore in the extrusion head. The hollow core may carry service lines to downstream parts of the apparatus and may act as or may carry an inner mandrel extending coaxially in an extrusion nozzle. The invention provides hollow core, the diameter of which is not greater than the diameter of the bore of the extrusion head. Thus, it may be possible to withdraw the core in a downsteam direction for tool changes and the like without the necessity of dismantling the extrusion head.

REFERENCES:
patent: 3357051 (1967-12-01), Zolotarevsky
patent: 3471899 (1969-10-01), Ronden
patent: 3677676 (1972-07-01), Hegler
patent: 3856446 (1974-12-01), Schultz
patent: 4712993 (1987-12-01), Lupke
patent: 4770618 (1988-09-01), Lupke
patent: 4798526 (1989-01-01), Briggs et al.

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