| US 7,600,995 B2 | ||
| Hot runner having reduced valve-stem drool | ||
| Michael Baumann, Trier (Germany); Daniel Hontheim, Bettingen (Germany); and Gilles Lacome, Avril (France) | ||
| Assigned to Husky Injection Molding Systems Ltd., Bolton, ON (Canada) | ||
| Filed on Oct. 31, 2007, as Appl. No. 11/930,212. | ||
| Prior Publication US 2009/0110762 A1, Apr. 30, 2009 | ||
| Int. Cl. B29C 45/23 (2006.01) | ||
| U.S. Cl. 425—564 [425/566] | 21 Claims |
| 1. A valve-gated hot-runner system, comprising:
a back-up sealing arrangement, including:
a plurality of radial gaps associated with a valve stem of a valve actuator; and
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 a flow of the drool along the valve stem and toward the valve actuator.
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