Extrusion blow molded container having cylindrical drum portion and mold for shaping the container

摘要

Bonding property of a bottom seal portion in a cylindrical extrusion blow molded container, particularly a cylindrical laminate peel blow molded container using a resin having low bondability such as nylon for an inner bag, can be improved and crack of the bottom can be prevented. In a cylindrical extrusion blow molded container or a cylindrical laminate peel blow molded container having an air introduction hole bored at a container mouth portion, a thick elliptic protrusion comprising a curve surface approximate to an elliptic surface having a parting line as an axial direction of the major diameter is formed at a portion in the proximity of the bottom seal portion of the bottom wall of the container bottom, and arcuate bottom ribs are formed at the bottom seal portion.