| 摘要 |
PURPOSE: A bottle cap including a screw structure in the inside is provided to reduce the size of the bottle cap by using a gasket in a thin film form. CONSTITUTION: A bottle cap includes a wall body, a cap unit, and a stopper. The wall body includes screw threads in a spiral shape on the inner surface. The cap unit(40) is integrated with the wall body. The stopper is a protrusion with the predetermined height projected from the inside the bottle cap. The height of the stopper is lower than the height of the screw thread of the wall body. A gasket(50) is inserted in between the inner surface of the cap unit and the stopper.
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