Patent ID: 11897656
Assignee: CO2PAC LIMITED
Field: Other special machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 16:
17. A plastic container having a longitudinal axis and comprising:
a finish defining an opening at a first end of the container;
a sidewall portion extending from the finish;
a multi-axially stretch oriented base portion having a degree of crystallinity between about 20% and 30% and extending from the sidewall portion such that the finish, the sidewall portion and the base portion define an interior volume therein for retaining a liquid commodity, the base portion having a support portion having a downwardly inclined outer annular wall portion to form a contact surface for supporting the container and defining a second end of the container;
the base portion providing an inner annular wall extending from the contact surface, wherein the inner annular wall further comprises an outer portion and an inner portion, wherein the outer portion extends from the contact surface to a region of juncture with the inner portion, wherein the inner portion extends from the region of juncture to a central push-up portion located along the longitudinal axis;
wherein prior to filling and sealing: the outer annular wall portion is configured to extend downwardly away from the finish to the contact surface, the inner annular wall is configured to extend inwardly away from the contact surface to the central push-up portion, the inner annular wall being configured to extend a distance away from the finish to a lesser degree than the outer annular portion wall after filling, sealing and cooling, wherein a portion of the inner annular wall extends downwardly away from the finish and is configured to be moveable upwardly toward the finish under a longitudinal or vacuum force; and
wherein after sealing: the inner annular wall is configured to move upwardly closer to the first end of the container or finish to compensate for vacuum pressure created following a cooling of the heated liquid within the sealed container, wherein the inner annular wall moves from an as-blown configuration to a first activated configuration under a first amount of longitudinal force against the container base, wherein the inner annular wall moves closer to the first end of the container as compared to the as-blown configuration, and further wherein the inner annular wall moves from the first activated configuration to a second activated configuration under a second amount of longitudinal force against the container base, wherein the inner annular wall moves closer to the first end of the container as compared to the first activated configuration and the inner portion is repositioned above the outer portion, and the central push-up portion is configured to move upwardly closer to the finish than the outer annular wall portion.