STRUCTURE OF MOUTH PLUG PART, PACKAGE, AND CLOSING METHOD OF PACKAGE

To provide: in a plug closing process of a mouth plug part applicable to a package, a structure of a mouth plug part capable of preventing interference between a female thread on the inner peripheral surface of a cap and an opening of a pouring part; a package; and a closing method of the package having such a structure of the mouth plug part.SOLUTION: A structure of a mouth plug part having a pouring part having a cylindrical outer peripheral surface with an opening formed at a tip, and a cap having cylindrical shape that can cover the pouring part and closing the opening when attached to the pouring part, in which: a male thread is formed on the cylindrical outer peripheral surface, and a female thread to be screwed into the male thread is formed on the inner peripheral surface of the pouring part: and the female thread has a top surface of the female thread and an inclined surface made by chamfering an intersection with at least one of the upper surface of the female thread and the lower surface of the female thread extending from the top surface toward the base of the female thread.SELECTED DRAWING: Figure 2 【課題】包装体に適用可能な口栓部の閉栓過程において、キャップの内周面の雌ネジ山と、注出部の開口との干渉を防止することが可能な口栓部の構造、包装体、及びこうした口栓部の構造を備えた包装体の閉栓方法を提供する。【解決手段】先端に開口が形成された筒状の外周面を有する注出部と、前記注出部を被覆可能な筒状を成し、前記注出部への装着時に前記開口を閉栓するキャップと、を備える口栓部の構造であって、前記注出部の外周面には雄ネジが形成され、前記キャップの内周面には、前記雄ネジに螺合する雌ネジが形成され、前記雌ネジは、雌ネジ山の頂面と、該頂面から雌ネジ山の基部に向けて広がる雌ネジ山上面または雌ネジ山下面のうち、少なくともいずれか一方との交差部分を面取りしてなる傾斜面を有することを特徴とする。【選択図】図２