MANUFACTURING METHOD FOR LID THAT REQUIRES NO CAN OPENER

摘要

A method of manufacturing an easy open end of this application includes the steps of using a laminated steel sheet with resin films formed on both surfaces of the laminated steel sheet, and forming a panel structure and a score. A score die used for forming the score includes a scoring edge having a cross section in which a tip is a curve and two sides with the tip interposed therebetween are tangent to the curve. The tip is the curve having a curvature radius ranging from 0.2 to 0.4 mm, and the two sides have elevation angles ¸ in a range of 0.3 ‰¤ tan¸ ‰¤ 1.0 to an end surface. The panel structure is formed by a motion that is synchronous with a motion in which the score die is pressed to a surface of the laminated steel sheet during the formation of the score. The manufacturing method can manufacture the easy open end that is not skewed and hence has good appearance without additional end processing equipment.