Injection molding nozzle having circumferentially spaced conduct

Details Injection molding nozzle having circumferentially spaced conduct Injection molding nozzle having circumferentially spaced conduct

1989-03-01

1990-05-01

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means to heat or cool

26432815, 425549, 425568, B29C 4520

Patent

active

049217089

ABSTRACT:
An injection molding multi-gate nozzle with a central portion having a central melt bore and a spiral electrical heating element integrally brazed in a channel in its outer surface. The nozzle has a number of elongated conductive probes spaced in a sleeve portion which extends around the central portion adjacent its forward end. Each probe extends in the sleeve portion a predetermined distance rearwardly along the central portion and projects from the sleeve portion a predetermined distance forwardly of the forward end of the central portion. Each conductive probe has a copper inner portion which picks up heat from the adjacent coils of the heating element and carries it forwardly to the projecting forward portion adjacent one of the gates. In addition to providing additional heat, this configuration with the forwardly projecting probes provides the mold with more structural strength and improved cooling.

REFERENCES:
patent: 3568256 (1971-03-01), Johnson
patent: 3758252 (1973-09-01), Kohler
patent: 4053271 (1977-10-01), Gellert
patent: 4094447 (1978-06-01), Gellert
patent: 4276014 (1981-06-01), Aoki
patent: 4450999 (1984-05-01), Gellert
patent: 4663881 (1987-05-01), Gellert
patent: 4688622 (1987-08-01), Gellert
patent: 4702689 (1987-10-01), Schmidt et al.
patent: 4768283 (1988-09-01), Gellert
patent: 4773154 (1988-09-01), Gellert

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