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US 7,771,190 B2Granted
High pressure injection molding nozzle with low pressure manifold
AssigneeHusky Injection Molding Systems Ltd.
InventorEdward Joseph Jenko
Life of this patent
Estimating the term…
Abstract
A hot runner system includes a having a cavity. Melt is fed from a source of melt into the cavity, and a valve isolates melt in the cavity from melt in the source. A plunger within the cavity is driven forward to inject melt in the cavity into a mold cavity at high pressure without significantly increasing the pressure of melt in the source. The plunger optionally functions as both the plunger and the valve by opening and closing communication between the cavity and the manifold as it is rotated.
Claims19
An injection apparatus comprising:
- a housing defining a cavity therein, said cavity in fluid communication with a source of melt, said housing further defining an injection outlet at a first end thereof;
- a shooting pot having a plunger in sliding communication with said cavity, said plunger operable for movement toward said injection outlet;
- a selectively closable valve intermediate to said cavity and said source, wherein said valve substantially isolates said cavity from said source;
- and
- a valve stem, said valve stem operable for engagement with said injection outlet and wherein said valve stem is actuated independently from said plunger.
2 more elements
A hot runner system comprising:
- a housing defining a cavity therein, said housing further defining an injection outlet at a first end thereof;
- a source of melt in fluid communication with said cavity, said source comprising a manifold;
- a shooting pot having a plunger in sliding communication with said cavity, said plunger operable for movement toward said injection outlet;
- and
- a selectively closable valve intermediate to said cavity and said manifold, wherein said valve substantially isolates said cavity from said manifold;
- wherein said plunger is operable to increase pressure of melt located in said cavity when said plunger is advanced toward said injection outlet, and wherein said valve is operable to substantially isolate said source from said increase in melt pressure when said valve is in a closed position;
- and
- a valve stem, said valve stem operable for engagement with said injection outlet and wherein said valve stem is actuated independently from said plunger.
5 more elements
Dependencies are inferred from the claim text.