Lightweight container base

1. A container comprising:

an opening defined by a finish portion;

a base at an end of the container opposite to the opening, the base including a standing ring extending inward from a heel to a center pushup portion, the center pushup portion including a pushup ring surrounding an inversion portion; and

a mold parting line between the standing ring and the pushup ring of the center pushup portion, the mold parting line and the pushup ring are formed by a movable mold pushup member that extends into the base as the container is being blow molded;

wherein:

in an as-blown position the inversion portion extends outward and beyond the pushup ring such that the inversion portion is further from the opening than the pushup ring;

in a final position the inversion portion is inverted relative to the as-blown position such that the inversion portion extends inward so as to be closer to the opening than the pushup ring; and

the inversion portion is mechanically moved from the as-blown position to the final position with an inversion device after the container has been filled and capped.

2. The container of claim 1 , wherein the mold parting line is spaced apart from, and raised above, a standing surface of the container.

3. The container of claim 1 , wherein the standing ring is a flexible standing ring.

4. The container of claim 1 , wherein the container is a polymeric, hot-fill container formed by blow molding.

5. The container of claim 1 , wherein the pushup ring includes an inversion area that rolls into an internal volume defined by the container as the inversion portion is mechanically moved from the as-blown position to the final position.

6. The container of claim 1 , wherein the inversion device is an inversion rod.

7. The container of claim 1 , wherein the base includes a plurality of straps spaced apart about the standing ring of the base, the straps extend into the standing ring and are configured to facilitate flexion of the standing ring.

8. The container of claim 7 , wherein the plurality of straps extend across the heel and across the standing ring towards the center pushup portion, the plurality of straps terminate prior to reaching the center pushup portion.

9. The container of claim 7 , further comprising a plurality of ribs spaced apart about the standing ring of the base, at least one of the plurality of ribs is between two of the plurality of straps.

10. The container of claim 9 , wherein the plurality of ribs include a plurality of recessed ribs extending across the heel and towards the center pushup portion.

11. The container of claim 10 , wherein the plurality of ribs further include a plurality of protruding ribs extending across at least a portion of the standing ring towards the center pushup portion.

12. The container of claim 1 , wherein:

in the as-blown position and the final position, the pushup ring is generally circular; and

when transitioning to the final position, the pushup ring has a polygonal shape.

13. The container of claim 1 , wherein in the final position the standing ring is configured to flex outward to absorb increased force within the container.

14. The container of claim 1 , wherein the inversion portion reduces vacuum within the container in the final position.

15. The container of claim 1 , wherein the inversion portion creates a positive pressure within the container in the final position.

16. The container of claim 1 , wherein the diameter of the pushup portion is about 50% of the container diameter.

17. The container of claim 1 , wherein the projected surface area of the pushup portion is about 20% to about 25% of the projected base surface area.

18. The container of claim 1 , wherein the projected surface area of the pushup ring is about 15% to about 20% of the projected base surface area.

19. The container of claim 1 , wherein the inversion ring is formed by an interim pushup molding step.

20. The container of claim 1 , wherein the inversion portion rolls when transitioning to the final position.

21. A container comprising:

an opening defined by a finish portion;

a base at an end of the container opposite to the opening, the base including a standing surface of the container;

a mold parting line of the base that is spaced apart from the standing surface, and raised above the standing surface such that the mold parting line is closer to the opening than the standing surface;

a central pushup portion surrounded by the mold parting line; and

an inversion portion of the central pushup portion through which a longitudinal axis of the container extends, in an as-blown position the inversion portion extends outward and beyond the pushup ring such that the inversion portion is further from the opening than the pushup ring, in a final position the inversion portion is inverted relative to the as-blown position such that the inversion portion extends inward so as to be closer to the opening than the pushup ring.

22. The container of claim 21 , wherein the container is a polymeric hot-fill container formed by blow molding.

23. The container of claim 21 , further comprising a pushup ring surrounding the inversion portion.

24. The container of claim 23 , wherein the mold parting line is between a standing ring including the standing surface and the pushup ring, the standing ring is configured to flex outward to absorb increased force within the container.

25. The container of claim 21 , wherein the base further includes an inversion area of a pushup ring that rolls into an internal volume defined by the container as the inversion portion is mechanically moved from the as-blown position to the filled position.

26. The container of claim 21 , wherein the inversion portion is mechanically moved from the as-blown position to the filled position after the container has been hot-filled.

27. The container of claim 21 , wherein the base further includes a plurality of straps spaced apart about a standing ring of the base, a plurality of outer ribs between the straps, and a plurality of inner ribs arranged inward of the outer ribs.

28. The container of claim 21 , wherein the inversion portion reduces vacuum within the container in the final position.

29. The container of claim 21 , wherein the inversion portion creates a positive pressure within the container in the final position.

30. The container of claim 21 , wherein the diameter of the pushup portion is about 50% of the container diameter.

31. The container of claim 21 , wherein the projected surface area of the pushup portion is about 20% to about 25% of the projected base surface area.

32. The container of claim 21 , wherein the projected surface area of the pushup ring is about 15% to about 20% of the projected base surface area.

33. The container of claim 21 , wherein the inversion ring is formed by an interim pushup molding step.

34. The container of claim 21 , wherein the inversion portion rolls when transitioning to the final position.