| 摘要 |
PURPOSE:To keep an airtightness without using a packing member by a method wherein an outer cover fitted over an inner closure for capping a bottle mouth part is provided with a recessed groove, that is fitted into a recess formed in the inner closure in a close contact state by elastically deforming a fin and a protuberance along the shape thereof. CONSTITUTION:An outer cover 30 fitted over an inner closure 20 for capping a bottle mouth part 10 is provided with a recessed groove 32, that is fitted into a recess 21 formed in the inner closure 20 in a close contact state by elastically deforming a fin 22 and a protuberance 23 along the shape thereof. The inner closure 20 and the outer cover 30 in a close contact state are fitted to the bottle mouth part 10. While the top surface of the outer cover 30 is pressed, the bottle mouth part 10 is capped. On the other hand, when the capped bottle mouth part 10 is opened, only the outer cover 30 is raised along a thread 11 by rotating the outer cover 30 with the inner closure 20 left in the bottle mouth part 10. The combination of the recess 21, fin 22, and protuberance 23 of the inner closure 20 with the recessed groove 32 of the outer cover 32 perfectly keeps an airtightness without using a packing member. |
