Method of extruding plastic film

Details Method of extruding plastic film Method of extruding plastic film

1975-10-22

1977-05-03

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

165180, 165185, 219 1049, 264 95, 264219, 264DIG46, 425146, 425379R, 425467, B29F 308

Patent

active

040215237

ABSTRACT:
A method of extruding plastic film is provided which employs a die comprising a die body having an inlet therein for receiving a plastic melt under pressure and having an annulus in the die in flow communication with the inlet and having a discharge orifice for extruding the plastic melt therefrom in tubular form. A heat conductive band is provided and supported by the die body and such band has a circumferential heat conductivity which is better than its radial heat conductivity; and, a heater is employed for heating the band with the band assuring heat is transmitted so that practically all points of an annular portion of the die body located immediately adjacent the band are substantially at the same temperature.

REFERENCES:
patent: 2834054 (1958-05-01), Maddock et al.
patent: 3029474 (1962-04-01), Voigt et al.
patent: 3193547 (1965-07-01), Schott, Jr.
patent: 3304408 (1967-02-01), Finch et al.
patent: 3363079 (1968-01-01), Schroyer
patent: 3609809 (1971-10-01), Slicker
patent: 3629549 (1971-12-01), Svendsen
patent: 3836313 (1974-09-01), Stafford

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