METHOD FOR MANUFACTURING THREADED BOTTLE CAN AND THREADED BOTTLE CAN

摘要

A method for producing a screw-top bottle-can and a screw-top bottle-can is provided so that a thread-forming process can be operated without damaging an inner coating and a resealing operation is improved. A shoulder part is formed by reducing a diameter of an aperture part of a closed-end cylindrical body, a cylindrical part having an intermediate diameter between a major thread diameter and a minor thread diameter and a tapered part which is tapered from an upper end of the cylindrical part toward an open-end part are formed above the shoulder part, and performing a thread-forming process from the tapered part to the cylindrical part so as to form a starting part of the screw-thread at a middle part of the tapered part.