Extrusion die with melt flow control

Details Extrusion die with melt flow control Extrusion die with melt flow control

1980-09-15

1982-06-01

Thurlow, Jeffery R.

Plastic article or earthenware shaping or treating: apparatus

Means providing a shaping orifice

264 406, 425378R, 425379R, 425381, 425466, B29F 304, B29F 308

Patent

active

043325432

ABSTRACT:
An extrusion die block providing a useful means of obtaining a polymer sheet with a highly efficient degree of gauge control comprises an extrusion passage defined by opposed surfaces and terminating in an extrusion orifice, at least one of said surfaces being provided with heating means comprising a plurality of elongated heater elements located within the die block at a distance of not more than 10 mm from the surface to be heated thereby, said elements being oriented in parallel with the major axis of each in the direction of extrusion.

REFERENCES:
patent: 2549569 (1951-04-01), Bradley
patent: 2814070 (1957-11-01), Bulkley et al.
patent: 3341388 (1967-09-01), Bunyea
patent: 3608145 (1971-09-01), Baker et al.
patent: 3609809 (1971-10-01), Slicker
patent: 3761553 (1973-09-01), Richardson
patent: 3767346 (1973-10-01), Mihalik
patent: 3819775 (1974-06-01), Mules
patent: 3883279 (1975-05-01), Heyer
patent: 3940221 (1976-02-01), Nissel
patent: 4129630 (1978-12-01), Etchu et al.
patent: 4252519 (1981-02-01), Farmer et al.

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