Bottom structure for plastic container for pressurized fluids
US4247012A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 13, 1979 |
| Grant date | Jan 27, 1981 |
| Priority date | — |
| Expiry date | Aug 13, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D1/0276
- WIPO fieldHandling
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.