Plastic article or earthenware shaping or treating: apparatus – Female mold and charger to supply fluent stock under... – With means to heat or cool
Patent
1994-10-17
1995-04-11
Heitbrink, Tim
Plastic article or earthenware shaping or treating: apparatus
Female mold and charger to supply fluent stock under...
With means to heat or cool
26432815, B29C 4520
Patent
active
054052580
ABSTRACT:
Injection molding apparatus for hot tip gating wherein a torpedo is screwed into a threaded seat in the forward end of a nozzle. The torpedo has an elongated shaft with a pointed tip mounted centrally in an outer collar by a pair of spiral blades which impart a swirling motion to the melt flowing to the gate. The temperature of the melt in the gate varies according to a continuous thermodynamic cycle in the torpedo. A thermocouple bore extends radially inward through the outer collar and one of the spiral blades to a conductive inner portion of the central shaft of the torpedo. The thermocouple bore is positioned whereby a thermocouple element extends radially outward from it into an insulative air space between the forward end of the nozzle and the mold. The thermocouple element has a substantially 90 degree rearward bend a predetermined distance from its inner end. The bend abuts against a tapered portion of the inner surface of the well in which the nozzle is seated to securely retain the thermocouple element against the inner end of the thermocouple bore. This accurate location and reliable retention of the thermocouple element in place provides the accurate monitoring of the melt temperature necessary for its control throughout the thermodynamic cycle.
REFERENCES:
patent: 4266723 (1981-05-01), Osuna-Diaz
patent: 4450999 (1984-05-01), Gellert
patent: 4820147 (1989-04-01), Gellert
patent: 4875848 (1989-10-01), Gellert
patent: 4913912 (1990-04-01), Leverenz
patent: 5028227 (1991-07-01), Gellert et al.
patent: 5049062 (1991-09-01), Gellert
patent: 5206040 (1993-04-01), Gellert
Dario Vetter and Hakim Belhadjhamida, Controlling the Heat in Hot Runners, May 1994, pp. 29, 30.
Heitbrink Tim
Mold-Masters Limited
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