| 摘要 |
A plastic container, especially well suited for carbonated beverage bottles, with a specially designed bottom to minimize stress and improve parison blowing is disclosed. The bottom end has a modified hemispherical shape contiguous with the sidewalls and a continuous seating ring, for stably supporting the bottle on a flat surface which is of convex annular shape and positioned between the seating ring and a center portion is an intermediate portion. The intermediate portion consists of two truncated cones defining an excluded volume. The first truncated cone has a generatrix of about 18 DEG and the second truncated cone has a generatrix of about 55 DEG . The excluded volume defined by the first and second truncated cones is increased by an odd number of equally sized and equally spaced semi-ellipsoid shaped portions. The center portion is convex and particularly designed for positioning the parison in the mold for blow molding.
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