Sprue bushing anti-drool device
AssigneeMold-Masters (2007) Limited
InventorDenis Babin
Life of this patent
Estimating the term…
Abstract
An anti-drool mechanism suitable for use in an injection molding system is provided herein. An injection molding machine includes a retractable machine nozzle for injecting a melt stream into a manifold. Between the machine nozzle and the manifold is an anti-drool mechanism, which includes a melt passage and a fixed pin disposed within the melt passage. The fixed pin is sized so that the melt stream will flow around the pin. The fixed pin has a head portion configured to engage with the machine nozzle and includes a first sealing surface. An actuated shut-off collar is also disposed within the melt passage, surrounding the pin, and includes a second sealing surface configured to cut off the flow of the melt stream when in contact with the first sealing surface.
Claims18
An injection molding system comprising:
- an injection molding machine including a machine nozzle for injecting a melt stream;
- a manifold having at least one manifold melt inlet for receiving the melt stream and having at least one melt channel for distributing the melt stream;
- and
- an anti-drool mechanism positioned between the machine nozzle and the manifold melt inlet including,
- a melt passage for communicating the melt stream from the machine nozzle to the manifold melt inlet,
- a fixed pin disposed entirely within the melt passage and sized so that the melt stream flows around the pin, the pin having a head portion, and
- a movable shut-off collar disposed at least partially within the melt passage and surrounding the pin, wherein a sealing surface of the shut-off collar contacts a sealing surface of the head portion of the pin to stop the flow of the melt stream through the melt passage.
An injection molding system comprising:
- an injection molding machine including a retractable machine nozzle for selectively engaging an anti-drool mechanism, wherein the machine nozzle delivers a melt stream of moldable material to the injection molding system by engaging the anti-drool mechanism;
- and
- a manifold having at least one manifold melt inlet downstream of the anti-drool mechanism for receiving the melt stream and at least one manifold melt channel for distributing the melt stream;
- the anti-drool mechanism comprising
- a melt passage;
- a fixed pin disposed within the melt passage and sized so that the melt stream flows around the pin, the pin having a base portion that defines a melt channel there through for communicating the melt stream from the melt passage of the anti-drool mechanism to the melt inlet of the manifold;
- and
- a moveable shut-off collar disposed at least partially within the melt passage of the anti-drool mechanism and surrounding the pin, wherein a sealing surface of the shut-off collar contacts a sealing surface of the pin to stop the flow of the melt stream through the anti-drool mechanism.
An injection molding system comprising:
- an injection molding machine having an injection unit and a machine nozzle;
- an injection manifold having an inlet and a plurality of melt channels, wherein the inlet receives a melt from the machine nozzle;
- a sprue bushing disposed between the machine nozzle and the manifold, said sprue bushing having a melt passage that is in fluid communication with the manifold inlet;
- a fixed pin having a shaft portion disposed within the sprue bushing melt passage, said fixed pin having a pin head portion on an upstream end of the shaft portion and a base portion on a downstream end of the shaft portion, wherein the base portion includes a melt channel there through;
- and
- a shut-off collar disposed at least partially within said sprue bushing melt passage, said shut-off collar having a sealing surface, and said shut-off collar being movable between a first closed position, wherein the sealing surface makes contact with the pin head portion to prevent the melt from entering or leaving the sprue bushing melt passage, and a second open position, wherein there is substantially no contact between the pin head portion and the sealing surface to allow the melt to flow through the sprue bushing melt passage.
Dependencies are inferred from the claim text.