Screw-top bottle-can and method for producing the same

Abstract

A method for producing a screw-top bottle-can and a screw-top bottle-can are provided so that a screw-thread can be formed without damaging an inner coating and a resealing operation can be improved. A shoulder part is formed by reducing a diameter of an opening 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 opening-end part are formed above the shoulder part, and forming a screw-thread 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.

1 - 5 . (canceled) 
     
     
         6 . A screw-top bottle-can wherein: a starting part of a screw-thread is formed at a middle of a tapered part formed from below a curl portion which is formed at an end of an opening part to a first round of a first ridge of the screw-thread; and the tapered part has a maximum outer diameter which is equal to or smaller than a minor diameter of a groove portion of the screw-thread which is adjacent to the first ridge.