Extrusion apparatus and process for production of multilayer fil

Details Extrusion apparatus and process for production of multilayer fil Extrusion apparatus and process for production of multilayer fil

1987-06-30

1989-06-27

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

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

4251311, 4251335, B29C 4706

Patent

active

048427918

ABSTRACT:
A process and apparatus are disclosed for reducing the carbonization of a thermally degradable barrier material during the extrusion of a multilayer laminate. A core extrudate of barrier material is extruded with a core extruder. A preencapsulation means is provided adjacent the downstream end of the core extruder. The core extrudate is joined with a preencapsular extrudate in the preencapsulation means in a coaxial relation wherein the preencapsular extrudate is disposed radially outwardly of the core extrudate. The preencapsulated core extrudate is then directed to a feed block and coextrusion die for incorporation in the coextruded multilayer film.

REFERENCES:
patent: 3315306 (1967-04-01), Ladner et al.
patent: 3477099 (1969-11-01), Lee et al.
patent: 3511903 (1970-05-01), Glass et al.
patent: 3528130 (1970-09-01), Lefevre et al.
patent: 3743459 (1973-07-01), Schrenk et al.
patent: 4410602 (1983-10-01), Komoda et al.
patent: 4611987 (1986-09-01), Hahn et al.
patent: 4629650 (1986-12-01), Kataoka
Research Disclosure No. 26718, Jul. 1986, "Early Encapsulation for Improved Protection of Thermally Degradable Resins in Coextruded Structures".

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