Plastic bottle with superior top load strength due to a champagne bottle shaped base

摘要

A plastic bottle 10 having a sidewall 14 and a bottom structure closing the bottle 10 at a lower end portion of the sidewall 14 and providing superior resistance to failure when the bottle 10 is subjected to a vertical load, the bottom having an outside surface rotationally symmetric about a longitudinal axis Y of the bottle 10, the bottom outside surface including a convex heel 24 having an upper margin of diameter D integrally formed with the lower end portion of the sidewall 14, a lower margin of the convex heel 24 leading to a continuous planar standing ring 30 lying in a plane perpendicular to the longitudinal axis Y of the bottle 10 to support the bottle 10 on any underlying surface, and a central concavity inside the standing ring 30, the central concavity 32 including a first surface defined by a circular cone 38 inclined with respect to the plane of the standing ring 30, the first surface having a lower most portion smoothly joining the standing ring 30, and wherein the lower margin of the convex heel 24 having an inside vertical radius of less than 0.11 DJ and the lowermost portion of the first surface having an inside vertical radius between 0.055D and 0.084D to achieve enhance failure resistance and stability.