Patent ID: 9149856
Filing Date: 2015-10-06
Classification: B21D,B21H,B65D,Y10T

Abstract:
1. A method for producing a screw-top bottle-can, comprising: forming a shoulder part by reducing a diameter of an opening part of a closed-end cylindrical body; forming a cylindrical part having an intermediate diameter between a major diameter and a minor diameter of a screw-thread and a tapered part which is tapered from an upper end of the cylindrical part toward the opening-end part above the shoulder part; and forming the screw-thread from the tapered part to the cylindrical part so as to form a starting part of the screw-thread at a middle of the tapered part, so that the tapered part is formed to have a maximum outer diameter which is equal to or smaller than the minor diameter of a groove portion which is adjacent to a first ridge of the screw-thread.