Preform and mold stack
AssigneeHusky Injection Molding Systems Ltd.
InventorsChristophe Simon Pierre Beck, Sebastian Rasche
Life of this patent
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Abstract
According to the present invention there is provided a preform suitable for subsequent blow molding, and a mold stock for producing the preform. The preform comprises a base having an elliptical inner face with a first flat circular bottom portion, and an elliptical outer face with a second flat circular bottom portion. The first and second flat circular bottom portions each have a center on a vertical center axis of the preform and a radius of equal size.
Claims15
A preform suitable for subsequent blow molding, the preform comprising:
- a neck, a base and a body extending therebetween, the neck, the body and the base each having inner and outer faces defining a wall thickness therebetween,
- the base having an elliptical inner face with a first flat circular bottom portion, and an elliptical outer face with a second flat circular bottom portion, and
- the first and second flat circular bottom portions each having a center on a vertical center axis of the preform and a radius R of equal size.
A mold stack for injection molding a preform having a neck, a body and a base, the mold stack comprising:
- a core insert comprising a first cavity defining portion configured to define an inner face of the neck and the body of the preform and, via a gate defining portion thereof, an inner face of the base of the preform,
- a split mold insert pair configured to define an outer face of the neck of the preform,
- a cavity insert configured to define an outer face of the body of the preform, and
- a gate insert comprising a second cavity defining portion configured to define an outer face of the base of the preform;
- the gate defining portion of the first cavity defining portion of the core insert having a first elliptical curvature with a first flat circular bottom portion, and the second cavity defining portion of the gate insert having a second elliptical curvature with a second flat circular bottom portion, and
- the first and second flat circular bottom portions each having a center on a vertical center axis of the mold stack and a radius R of equal size.
Dependencies are inferred from the claim text.