Method for manufacturing hollow article

A method for manufacturing a hollow article by using a plurality of inner molds and three pairs of a first mold and a second mold, the method comprising

• a first molding process and a second molding process performed repeatedly with a rotation process interposed therebetween, wherein
• the first molding process includes
• injecting resin into a first clearance defined between a first pair of the three pairs of molds to couple a first pair of divided pieces formed in the first pair of the three pairs of molds to be a first hollow article when the first pair of the three pairs of molds is located at an injection station, wherein the first pair of the three pairs of molds is fitted together without any one of the plurality of inner molds,
• inserting a first one of the plurality of inner molds between a second pair of the three pairs of molds when the second pair of the three pairs of molds is located at a setup station,
• holding a third pair of the three pairs of molds when the third pair of the three pairs of the molds is located at a removing station, wherein a second one of the plurality of inner molds is interposed between the third pair of the three pairs of molds, and
• in the rotation process,
• the first pair of the three pairs of molds located at the injection station is moved to the removing station,
• the third pair of the three pairs of molds located at the removing station is moved to the setup station, and
• the second pair of the three pairs of molds located at the setup station is moved to the injection station, and
• the second molding process includes
• injecting resin into a second clearance defined between the second pair of the three pairs of molds located at the injection station, which is fitted together with the first one of the plurality of inner molds interposed therebetween, to mold a third pair of divided pieces,
• taking out the first hollow article from the first pair of the three pairs of molds located at the removing station, and
• removing the second one of the plurality of inner molds from the third pair of the three pairs of molds located at the setup station while leaving a second pair of divided pieces therebetween.