Leak protection bushing for hotrunner manifold assembly
AssigneeIncoe Corporation
InventorsScott Greb, Anton Joerg, Christian Striegel
Life of this patent
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Abstract
A hotrunner assembly for an injection molding apparatus includes a hotrunner manifold, a nozzle for conveying liquid resin from an outlet of the hotrunner manifold, a valve pin linearly movable within and along a longitudinal axis of the nozzle to control flow of the liquid resin from the outlet of the hotrunner manifold, an actuator for driving the valve pin, a primary seal disposed radially between the valve pin and walls of a bore extending through the hotrunner manifold, and a secondary seal located axially between the hotrunner manifold and the actuator and circumscribing a section of the valve pin to prevent gases or liquid resin from contacting the actuator.
Claims16
A hotrunner assembly for an injection molding apparatus, comprising:
- a hotrunner manifold defining a channel for conveying liquid resin from an inlet to at least one outlet;
- a nozzle disposed on the manifold for conveying the liquid resin from the outlet to a mold cavity;
- a valve pin linearly movable within and along a longitudinal axis of the nozzle to control flow of the liquid resin into the mold cavity;
- an actuator for driving the valve pin;
- a primary seal disposed radially between the valve pin and walls of a bore extending through the hotrunner manifold;
- and
- a secondary seal located axially between the hotrunner manifold and the actuator, the secondary seal spaced from the hotrunner manifold to prevent conductive heat transfer from the hotrunner manifold to the secondary seal, and the secondary seal circumscribing a section of the valve pin to prevent gases and/or liquid resin from contacting the actuator.
Dependencies are inferred from the claim text.