Two stage flow through seal pin
AssigneeDiscma AG
InventorsG. David Lisch, Frederick C. Beuerle, Darrell Lee
Life of this patent
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Abstract
A nozzle and system for hydraulic blow molding of a plastic container from a preform. The nozzle includes a nozzle body having a main bore extending therethrough and a seal pin received in the main bore and moveable between a closed position and an opened position. The seal pin include a central bore extending from an entrance orifice to an exit orifice, with the entrance orifice opening into the main bore of the nozzle body.
Claims37
A nozzle for hydraulic blow molding of a preform into a plastic container, the nozzle comprising:
- a nozzle body having a main bore extending therethrough from an inlet to a outlet, portions of the main bore defining a valve seat;
- a seal pin received in the main bore and moveable between a closed position and an opened position, the seal pin including portions defining a sealing surface and further having a central bore extending therethrough from a entrance orifice to a exit orifice, the entrance orifice opening into the main bore;
- and
- a valve associated with the central bore, the valve being moveable between an open position and a closed position, in the closed position, the valve preventing the flow of a molding medium in liquid form through the central bore and into the preform.
A method of hydraulic blow molding a container from a preform, the method comprising the steps of:
- positioning a preform within a mold having interior surfaces defining a mold cavity in the shape of the container;
- providing a molding medium to a main bore of a nozzle, the molding medium being liquid;
- injecting the molding medium through a central bore of the nozzle into the preform during a first molding stage at a first flow rate, the first bore having an inlet opening in communication with the main bore and receiving the molding medium therethrough from the main bore;
- axially stretching the preform in response to a force exerted on the preform by the injected molding medium during the first molding stage;
- injecting the molding medium into the preform during a second molding stage and at a flow rate, during the second stage at least a portion of the molding medium not passing through the central bore and being injected into the preform directly from the main bore;
- and
- radially expanding the preform into the shape of the container during the second molding stage.
Dependencies are inferred from the claim text.