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. 01, 2025
Filed:
Nov. 16, 2020
Toyo Seikan Group Holdings, Ltd., Tokyo, JP;
Takuho Kumagai, Yokohama, JP;
Kenichi Takao, Yokohama, JP;
Ryozo Shiroishi, Yokohama, JP;
Masahiro Shimamura, Yokohama, JP;
Naoya Matsumoto, Yokohama, JP;
TOYO SEIKAN GROUP HOLDINGS, LTD., Tokyo, JP;
Abstract
A method of producing aluminum cans, including an ironing step using an ironing die (). The ironing die has a carbon film () formed as to cover a working surface thereof. The carbon film exhibits a Raman spectrum such that an intensity ratio represented by I/Iwherein Iis a maximum peak intensity at 1333±10 cmin the Raman spectrum of the surface of said carbon film, and Iis a maximum peak intensity at 1500±100 cmin the Raman spectrum of the surface of said carbon film, is not less than 1.2. The surface of the carbon film is a smooth surface having an arithmetic mean roughness R of not more than 0.05 μm. Further, the ironing step includes iron-working an aluminum sheet in a dry process using no lubricant while maintaining an ironing ratio in excess of 40%.