| 摘要 |
PROBLEM TO BE SOLVED: To effectively suppress generation of drawing unevenness in blow molding using liquid as a pressurization medium without increasing a configuration of a device.SOLUTION: A blow molding device includes a die for blow molding and a blow nozzle closely communicating with a mouth cylindrical part of a bottomed cylindrical preform, and supplies liquid serving as a pressure medium to inside of the preform via the blow nozzle. An insertion cylindrical piece inserted to the mouth cylindrical part is extended at a lower end of the blow nozzle. An extension length of the insertion cylindrical piece is set to be a length enabling a lower end of the insertion cylindrical piece to extend downwardly from a neck ring installed around a lower end of the mouth cylindrical part with the blow nozzle communicating with the mouth cylindrical part. |
