Injection molding nozzle with edge gate inserts and sealing ring

Details Injection molding nozzle with edge gate inserts and sealing ring Injection molding nozzle with edge gate inserts and sealing ring

1996-12-23

1998-10-13

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, 425572, 425588, B29C 4520

Patent

active

058208992

ABSTRACT:
Edge gated injection molding apparatus wherein each heated nozzle has the combination of a circular sealing ring extending around it and several gate inserts, each extending radially outward from the nozzle in alignment with a gate. The sealing ring bridges an insulative air space between the heated nozzle and the surrounding wall of a well in the cooled mold to provide a sealed portion of the space around the gate inserts. The outer end of each gate insert is spaced a predetermined distance "D" from the wall of the well in which the nozzle is seated to form an opening therebetween. The opening is large enough to allow pressurized melt to flow outwardly therethrough into the sealed front portion of the space between the nozzle and the surrounding wall of the well and small enough to prevent the partially solidified melt in the sealed front portion of the space being sucked back into the melt stream during subsequent injection cycles.

REFERENCES:
patent: 3822856 (1974-07-01), Gellert
patent: 4344750 (1982-08-01), Gellert
patent: 4557685 (1985-12-01), Gellert
patent: 4705473 (1987-11-01), Schmidt
patent: 4981431 (1991-01-01), Schmidt
patent: 5554395 (1996-09-01), Hume et al.
Mold-Masters Limited brochure entitled"Hot Edge Gate Design" dated Jun. 1980 - p. 6.
Mold-Masters Limited brochure entitled "Injection Molding with Modular Hot Runner Systems" dated 1987 - p. 6.
Konanews dated Dec. 1995 - p. 3.

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