| 摘要 |
PURPOSE:To prevent moisture from entering from both faces of a circular bending part with a simple structure by making a part corresponding to a circular flange into a circular bending part having a curved cross section supported by two circular ribs. CONSTITUTION:After a drying agent put in a protrusion 12 is mounted in a cap body 1, the cap body 1 is screwed into a container. Screwing the cap body 1 causes a circular bending part 11 first to be pressed by an end face of the container. Since the circular bending part 11 is supported by two lines of circular ribs 14, 15 in a linear contact with the cap body 1, seals A, B comprising two circular pressure-fitting lines are formed by the pressure-fitting of the circular ribs 14, 15. Therefore moisture entering along the cap body 1 from a direction (a) can be prevented from entering. At the same time, a surface side of the circular bending part 11 is formed of a seal C in a plane contact by the pressure-fitting of the container with the end face and is held at constant pressure-fitting force by a spring property of the circular bending part, thereby preventing moisture from entering from a direction (b). |
