| 摘要 |
PROBLEM TO BE SOLVED: To provide a bottle plug which prevents separation between a crown head body and a plug body when opening the bottle plug by using a plug opener while facilitating correspondence to the recycling law by lightening the plug body more than the crown head body in the bottle plug composed of the plug body made of resin and the crown head body made of metal.SOLUTION: A plug body 1 is formed of a hollow step part 6 on a flange part 4, thereby, is reduced in weight and is provided with reinforcement ribs 9a, 9b on the hollow step part 6. End surfaces of the reinforcement ribs 9a, 9b are set as an inclination surface 11 to make the volume of the reinforcement ribs 9a, 9b smaller than that of a conventional reinforcement rib 12 and, thereby, the number of the reinforcement ribs 9a, 9b is made to be more than that in the conventional technique to improve a rigidity of the flange part 4. When a bottle plug is opened by a plug opener 19, the twisting is caused on the plug body 1, therefore, the sliding is apt to be caused between a caulking part 15 of a crown head body 2 and the flange part 4 of the plug body 1, however, the rigidity (bending strength) of the flange part 4 is improved and, therefore, the flange part 4 is not deformed and the plug body 1 can be opened by the plug opener 19. |
