Injection molding sealing collar with a central hot tip shaft

Details Injection molding sealing collar with a central hot tip shaft Injection molding sealing collar with a central hot tip shaft

1992-02-14

1993-04-27

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

2642972, 2643288, 26432815, 425570, 425572, 425588, B29C 4522

Patent

active

052060403

ABSTRACT:
This invention relates to a hot tip gated injection molding apparatus having a heated manifold to distribute melt to a number of spaced gates. An unheated sealing and conductive member is mounted directly between the heated manifold and the cooled cavity plate in alignment with each gate. The sealing and conductive member has an elongated hot tip shaft which is connected to extend centrally through the bore of an outer collar portion by a number of spaced spiral blades. The collar portion bridges an insulative air space between the hot manifold and cooled cavity plate to prevent melt leaking into it. Heat received through the rear end of the collar portion which abuts directly against the heated manifold is transferred through the blades and the hot tip shaft to the gate area which is aligned with the pointed forward end of the hot tip shaft. The rear end of the hot tip shaft extends rearwardly into a branch of the melt passage to pick up heat from the surrounding melt. The hot tip shaft has a highly conductive inner portion inside an abrasion resistant outer portion to conduct heat to and away from the gate area during different parts of the injection cycle. The spiral blades impart a swirling motion to the melt which flows between them.

REFERENCES:
patent: 4266723 (1981-05-01), Osuna-Diaz
patent: 4279588 (1981-07-01), Gellert
patent: 4303382 (1981-12-01), Gellert
patent: 4450999 (1984-05-01), Gellert
patent: 4810184 (1989-03-01), Gellert et al.
patent: 5028227 (1991-07-01), Gellert et al.
patent: 5141696 (1992-08-01), Osuna-Diaz

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