Die for extruding plastic film

Details Die for extruding plastic film Die for extruding plastic film

1974-01-31

1976-01-13

Shore, Ronald J.

Plastic article or earthenware shaping or treating: apparatus

Means providing a shaping orifice

Core, pin or insert member

165185, 219540, 425379, B29F 308

Patent

active

039321037

ABSTRACT:
A die for extruding plastic film is provided wherein such die comprises 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: 3029474 (1962-04-01), Voigt et al.
patent: 3304408 (1967-02-01), Finch et al.
patent: 3387333 (1968-06-01), Irvine et al.
patent: 3629549 (1971-12-01), Svendsen
patent: 3677682 (1972-07-01), Putkowski

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