Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Layered – stratified traversely of length – or multiphase...
Patent
1974-03-20
1976-04-06
Thurlow, Jeffery R.
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Layered, stratified traversely of length, or multiphase...
156 79, 156229, 156244, 264 95, 264209, 264210R, 264237, B29D 724, B32B 2734
Patent
active
039490424
ABSTRACT:
A tubular, laminar, plastic sheet material having a core layer of oriented plastic and two outer layers of approximately isotropic plastic is prepared in extrusion apparatus whose die block has three channels wider than they are thick, and merging at acute angles to form an extrusion nozzle. The channels are continuously supplied with molten resin compositions webs of which are superimposed on each other in area contact at the junction of the channels. They move as an initially fluid, but coherent, layered structure from the nozzle into an immediately adjacent duct of a cooling head in which the structure is cooled from a first temperature above the melting temperature of the highest-melting resin composition of the central layer to a temperature intermediate that melting temperature and the temperature at which the outer, lower melting layers become solid. The friction exerted on the fluid outer layers by the walls of the duct in the cooling head exerts a sufficient braking action on all three layers that the laminar structure may be drawn from the outer orifice of the cooling head under tension high enough to stretch the laminar structure to twice its initial length or more without failure in tension of the plastic material in the cooling head and the die nozzle. Only the central layer is solid at the outer orifice of the cooling head so as to become oriented while the still fluid outer layers remain isotropic.
REFERENCES:
patent: 2317687 (1943-04-01), Larchar
patent: 3068516 (1962-12-01), Hofer
patent: 3187982 (1965-06-01), Underwood et al.
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patent: 3508944 (1970-04-01), Henderson et al.
patent: 3567539 (1971-03-01), Schirmer
Berman Hans
Multifol Patentverwertungs AG
Thurlow Jeffery R.
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