Extrusion of degradable plastic material in tubular form

Details Extrusion of degradable plastic material in tubular form Extrusion of degradable plastic material in tubular form

1997-03-21

1998-08-04

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Layered, stratified traversely of length, or multiphase...

26417129, 26417313, 2642098, 4251331, 425462, B29C 4706, B29C 4720

Patent

active

057889023

ABSTRACT:
A method of extruding degradable plastic material in tubular form includes providing an annular extrusion die having an annular extrusion orifice and a longitudinal extending annular passage for conveying plastic material to the extrusion orifice. The die also has at least one arcuate passage extending at least partly around the annular passage such that the annular passage completely surrounds, or where there is more than one arcuate passage in combination completely surround, the annular passage inwardly or outwardly thereof and are in communication therewith. A separate melt stream of degradable plastic material is provided for each arcuate passage and each separate melt stream of degradable plastic material is incorporated with non-degradable plastic material in a circumferentially continuous manner to produce separate encapsulated melt streams. Each encapsulated melt stream is fed to a respective arcuate passage to cause encapsulated plastic material to pass into the annular passage with subsequent extrusion in tubular form from the annular die orifice.

REFERENCES:
patent: 5143677 (1992-09-01), Blemberg et al.
patent: 5262109 (1993-11-01), Cook

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