Lip heater for plastic extrusion die

Details Lip heater for plastic extrusion die Lip heater for plastic extrusion die

1988-08-16

1989-06-27

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Temperature control

264 406, 2642097, 425144, 4253781, 425DIG13, B29C 4786

Patent

active

048425044

ABSTRACT:
An extrusion die-set is disclosed for extruding plastic film, in which the nozzle-lips (6,8) are heated, for the purpose of allowing production speed to be raised without losing film-quality. The heaters include aluminum rings (62,82) embedded in grooves in the dies near the nozzle lips. The surfaces (66,67,86,87) of the ring that face away from the nozzle lips are cut away, so that heat transfer to the bulk of the dies (60,80) is reduced. The disclosed heaters eliminate the problem of hot-spots and cold-spots around the circumference of the nozzle. The nozzle lips can run several degrees hotter than the bulk of the dies, using the disclosed heaters.

REFERENCES:
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patent: 3497915 (1970-03-01), Ronden
patent: 3588987 (1971-06-01), Korostoff et al.
patent: 3743252 (1973-07-01), Schott, Jr.
patent: 3752635 (1973-08-01), Hinrichs
patent: 3767346 (1973-10-01), Mihalik
patent: 4332543 (1982-06-01), Fulton et al.

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