Method for manufacturing cup-shaped container

A method for manufacturing a cup-shaped container including a container bottom and a container trunk portion on the container bottom, using a mold having a core mold and a cavity mold between which a container bottom forming portion and a container trunk forming portion are formed for the container bottom and the container trunk portion, respectively, the method comprising:

• disposing a label film on a side of the cavity mold in the container trunk forming portion in the mold, the label film having gas barrier properties and extending along the cavity mold, the label film having a joint portion where both ends of the label film meet;
• injecting a container surface resin into a container inner side in the container trunk forming portion relative to the label film from an injection molding nozzle of which a nozzle gate faces the container bottom forming portion in the mold;
• while injecting the container surface resin, feeding a gas barrier resin into the container trunk forming portion as an intermediate layer between a portion of the container surface resin being spread along the core mold and a portion of the container surface resin being spread along the cavity mold, the intermediate layer being fed to extend along the joint portion of the label film so that a longitudinal stripe-shaped gas barrier layer is formed over the joint portion of the label film;
• and
• after feeding the gas barrier resin into the container trunk forming portion, while injecting the container surface resin from the injection molding nozzle into the container bottom forming portion in the mold, feeding the gas barrier resin into the container bottom forming portion as the intermediate layer between the portions of the container surface resin to form a plane-shaped gas barrier layer extending radially in the container bottom forming portion, wherein
• the cup-shaped container has the longitudinal strip-shaped gas barrier layer made of the gas barrier resin on the container inner side in the container trunk portion relative to the label film and along the joint portion of the label film, and the plane-shaped gas barrier layer in the container bottom, the longitudinal strip-shaped gas barrier layer and the plane-shaped gas barrier layer being continuous with each other.