Flask provided with structural ribs

摘要

A container is formed of a shell having a top section, a bottom section and a central section connecting the top section and the bottom section. At least a majority region of the central section is provided with a plurality of structural ribs about its periphery. The ribs are discontinuous in a circumferential direction extending around the central section and have specific structures in their shape, their orientation with respect to each other and their longitudinal alignment to enable the container to withstand deformation due to internal or external pressures. Each rib has longitudinal angle of orientation is less than 90° relative to the vertical axis of the container.