Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to heat or cool
Patent
1985-10-17
1987-03-10
Spitzer, Robert
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to heat or cool
425566, 425570, 425571, 425DIG224, 425DIG227, B29C 4503, B29F 103
Patent
active
046488332
ABSTRACT:
Disclosed herein is a hot nozzle for use with a mold for runnerless injection molding of plastic material. The hot nozzle includes a body formed of a conductive metal having a predetermined electrical resistance. The body has a nozzle portion and a base portion, and has a pair of diametrically disposed longitudinal slits extending substantially over the length thereof except at least a portion of the forward end of the nozzle portion in such a manner as to divide the nozzle portion substantially into two sections. The base portion has on opposite ends separated by the slits a pair of power receiving mechanisms for connection to an external source of power. With this arrangement, the nozzle portion itself, particularly at the front end thereof, is heated by voltage applied across the opposite ends of the base portion. Further, the outer surface of the nozzle body is covered with a dielectric and adiabatic film so as to prevent leakage of resin from the nozzle through the slits and ensure both electrical and thermal insulation of the heating nozzle portion.
REFERENCES:
patent: 3520026 (1970-07-01), Stidham et al.
patent: 3800027 (1974-03-01), Tsutsumi
patent: 3952927 (1976-04-01), Schaumburg et al.
patent: 4171941 (1979-10-01), Yotsutsuji et al.
patent: 4304544 (1981-12-01), Crandell
patent: 4516927 (1985-05-01), Yoshida
patent: 4576567 (1986-03-01), Gellert
patent: 4588367 (1986-05-01), Schad
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