Stretch blow molded oblong or oval container

摘要

This relates to the stretch blow molding of containers having bodies of oblong or oval cross section starting with an injection molded plastic preform. First there is the discovery that the preform does not axially stretch evenly as occurs with circular or generally circular cross sectional container bodies but includes a lesser stretching at the center of sides of such container bodies. Having made this discovery, it is proposed to provide such containers with oval or oblong cross sectional bodies with radially inwardly directed ribs wherein the ribs conform to the differential in axial stretching of the material of the preform.