| 摘要 |
In a stopper arrangement for bottles of the type having an externally threaded neck closable by a synthetic plastic screw cap, the screw cap has an approximately cylindrical internally threaded wall part which is closed by an upper lid surface. The screw cap is so dimensioned and configured, and is formed of such an elastic plastic material, that the cap can be removed by unscrewing, or can be removed by a conventional crown cork opener. In either case, the cap can be used to re-close the bottle, since it is specially constructed so as not to be destroyed if removed by a crown cork opener. Important features of the screw cap involve the number of threads, the pitch angle of the threads, the thread depth, the thickness of the cylindrical wall part, the provision of a protruding section engageable by the lifting portion of a crown cork opener, the distance between the lid surface and the protruding section, and the elasticity of the plastic material considered in conjunction with the dimensions and configuration of the cap. The inner side of the lid surface preferably is formed with a sealing member which extends into the bottle opening. |
