INJECTION BLOW MOLDING BOTTLE HAVING INNER PLUG SLIP-OFF PREVENTING STRUCTURE IN MOUTH INNER FACE, MANUFACTURING METHOD THEREFOR, AND INJECTION MOLDING MOLD

摘要

PROBLEM TO BE SOLVED: To provide an injection blow molding bottle having a new inner plug slip-off preventing structure in a mouth inner face capable of preventing the inner plug from slipping off even when the inner plug is relatively largely contracted by returning to a normal temperature after stored under a high temperature environment. SOLUTION: In this thermoplastic resin made injection blow molding bottle which is integrally equipped with at least a bottle body 4 and a bottle mouth part 3, and in which a thermoplastic resin made inner plug 6 is fitted in the bottle mouth part 3, an under cut 11 formed during molding is provided in the mouth inner face of the bottle mouth part 3, the inner plug 6 is prevented from slipping off by utilizing this under cut 11, and air-tightness and liquid- tightness are ensured.