Vacuum absorbing bases for hot-fill containers
AssigneeAmcor Limited
InventorsJames Stelzer, Michael T. Lane
Life of this patent
Estimating the term…
Abstract
A polymeric container including an upper portion defining an opening to an interior volume of the container. A base is movable to accommodate vacuum forces generated within the container, thereby decreasing the volume of the container. A substantially cylindrical sidewall extends between the upper portion and the base. A rigid, central pushup portion of the base is at an axial center of the base. A central longitudinal axis of the container extends through a center of the central pushup portion. A flexible diaphragm of the base extends outward from the central pushup portion.
Claims40
A polymeric container comprising:
- an upper portion defining an opening to an interior volume of the container;
- a base movable to accommodate vacuum forces generated within the container thereby decreasing the volume of the container;
- a substantially cylindrical sidewall extending between the upper portion and the base;
- a rigid, central pushup portion of the base at an axial center of the base, a central longitudinal axis of the container extends through a center of the central pushup portion;
- a flexible diaphragm of the base extending outward from the central pushup portion;
- and
- a side surface of the central pushup portion extending outward and away from the longitudinal axis of the container to the flexible diaphragm at a draft angle of 30° to 35° relative to the longitudinal axis;
- wherein the side surface of the central pushup portion transitions to the flexible diaphragm at a lowermost portion of the base, with respect to portions of the base that are inward of a contact ring of the base the lowermost portion of the base is furthest from the upper portion of the container.
A polymeric container comprising:
- an upper portion defining an opening to an interior volume of the container;
- a base movable to accommodate vacuum forces generated within the container thereby decreasing the volume of the container;
- a substantially cylindrical sidewall extending between the upper portion and the base;
- a rigid, central pushup portion of the base at an axial center of the base, a central longitudinal axis of the container extends through a center of the central pushup portion;
- and
- a flexible diaphragm of the base extending outward from the central pushup portion;
- wherein the flexible diaphragm has an actual surface area that is about 20% to about 25% greater than an actual surface area of the rigid central pushup portion.
A polymeric container comprising:
- an upper portion defining an opening to an interior volume of the container;
- a base movable to accommodate vacuum forces generated within the container thereby decreasing the volume of the container;
- a substantially cylindrical sidewall extending between the upper portion and the base;
- a rigid, central pushup portion of the base at an axial center of the base, a central longitudinal axis of the container extends through a center of the central pushup portion;
- and
- a flexible diaphragm of the base extending outward from the central pushup portion;
- wherein the central pushup portion transitions to the flexible diaphragm halfway between the central longitudinal axis of the container and an outer diameter of the container.
Dependencies are inferred from the claim text.