Method of extruding laminated film

Details Method of extruding laminated film Method of extruding laminated film

1967-05-26

1984-03-06

Lechert, Jr., Stephen J.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

15624422, 264176R, 4274123, B29C 1900

Patent

active

044352417

ABSTRACT:
A lamination die apparatus; a method of extruding; and extruded products where two or more laminarly flowing plastic layers are joined in front of an extrusion nozzle, and are simultaneously extruded through the extruded nozzle. The laminarly joined flows are caused to diverge before being extruded through the extrusion orifice. The various layers may be of the same or different material. The layers variously include polyethylene, polypropylene, polyvinylchloride and can have electrical or magnetic particles mixed therein to impart electrical or magnetic characteristics to the film. The die structure may be for blowing tubular film or for the extrusion of flat film. The flat die includes a diverter for diverting a main stream into at least two paths of laminar flow and injecting a central plastic fluid between these two paths.

REFERENCES:
patent: 2809393 (1957-10-01), Hauptman
patent: 3223761 (1965-12-01), Raley

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