The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 14, 2015
Filed:
Nov. 26, 2009
Katsumi Kojima, Chiyoda-ku, JP;
Hiroshi Kubo, Chiyoda-ku, JP;
Yoichiro Yamanaka, Chiyoda-ku, JP;
Masaki Tada, Chiyoda-ku, JP;
Hiroki Iwasa, Chiyoda-ku, JP;
Katsumi Kojima, Chiyoda-ku, JP;
Hiroshi Kubo, Chiyoda-ku, JP;
Yoichiro Yamanaka, Chiyoda-ku, JP;
Masaki Tada, Chiyoda-ku, JP;
Hiroki Iwasa, Chiyoda-ku, JP;
JFE Steel Corporation, Tokyo, JP;
Abstract
A method of manufacturing an easy open end 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 θ in a range of 0.3≦tan θ≦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.