Extrusion of plastic materials in multilayer tubular film

Details Extrusion of plastic materials in multilayer tubular film Extrusion of plastic materials in multilayer tubular film

1998-05-21

2000-09-12

Pyon, Harold

Plastic article or earthenware shaping or treating: apparatus

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

Extrusion shaping means

425380, 425462, 425467, B29C 4706

Patent

active

061168858

ABSTRACT:
An apparatus for extruding plastic materials in multilayer tubular form includes an annular extrusion die having an annular extrusion orifice and annular passage for conveying plastic material to the extrusion orifice, the die also having at least one arcuate passage extending at least partly around the annular passage such that the arcuate passage completely surrounds, or where there is more than one arcuate passage in combination completely surround, the annular passage inwardly or outwardly thereof and is or are in communication therewith. A melt stream of plastic material is encapsulated with a different plastic material in a circumferentially continuous manner to produce an encapsulated melt stream, and at least a portion of the encapsulated melt stream is fed to an arcuate passage to cause at least partially encapsulated plastic material to pass into the annular passage with subsequent extrusion in multilayer tubular form from the annular die orifice.

REFERENCES:
patent: 5788902 (1998-08-01), Planeta

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