Bottom structure for plastic container for pressurized fluids

Details Bottom structure for plastic container for pressurized fluids Bottom structure for plastic container for pressurized fluids

1979-08-13

1981-01-27

Norton, Donald F.

Bottles and jars

Ejecting

Siphon type

220 70, B65D 102

Patent

active

042470129

ABSTRACT:
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.degree. and the second truncated cone has a generatrix of about 55.degree.. 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.

REFERENCES:
patent: 3870181 (1975-03-01), Sincock
patent: 4108324 (1978-08-01), Krishnakumar

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