Hot runner having reduced valve-stem drool

Details Hot runner having reduced valve-stem drool Hot runner having reduced valve-stem drool

2009-09-24

2010-10-26

Heitbrink, Tim (Department: 1791)

Plastic article or earthenware shaping or treating: apparatus

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

With means between charger and mold to cut off flow of...

C425S566000

Reexamination Certificate

active

07819654

ABSTRACT:
Disclosed is a valve-gated hot-runner system, having: (i) a back-up sealing arrangement, including: (i) a plurality of radial gaps associated with a valve stem of a valve actuator, and (ii) a cooling system being positioned relative to the plurality of radial gaps, the cooling system being configured to freeze a drool being made to enter, under pressure, into the plurality of radial gaps, so that the drool that becomes frozen substantially reduces flow of the drool along the valve stem and toward the valve actuator.

REFERENCES:
patent: 5387099 (1995-02-01), Gellert
patent: 6840758 (2005-01-01), Babin et al.
patent: 7600995 (2009-10-01), Baumann et al.
patent: 2006/0153945 (2006-07-01), Blais et al.
patent: 2402863 (2001-10-01), None
patent: 2523636 (2006-04-01), None
patent: 01178881 (2003-04-01), None
patent: 00071325 (2000-11-01), None
U.S. Appl. No. 11/930,212, filed Oct. 31, 2007, Baumann, et al.

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