US 11,745,245 B2
Metallic worked articles
Takuho Kumagai, Yokohama (JP); Ryozo Shiroishi, Yokohama (JP); Naoya Matsumoto, Yokohama (JP); Masahiro Shimamura, Yokohama (JP); and Tomohiro Ogawa, Yokohama (JP)
Assigned to TOYO SEIKAN GROUP HOLDINGS, LTD., Tokyo (JP)
Appl. No. 17/41,601
Filed by TOYO SEIKAN GROUP HOLDINGS, LTD., Tokyo (JP)
PCT Filed Mar. 14, 2019, PCT No. PCT/JP2019/010478
§ 371(c)(1), (2) Date Sep. 25, 2020,
PCT Pub. No. WO2019/188324, PCT Pub. Date Oct. 3, 2019.
Claims priority of application No. 2018-058484 (JP), filed on Mar. 26, 2018.
Prior Publication US 2021/0023603 A1, Jan. 28, 2021
Int. Cl. B21D 22/28 (2006.01); B21D 51/26 (2006.01); B21D 22/30 (2006.01); B65D 1/40 (2006.01)
CPC B21D 22/28 (2013.01) [B21D 51/26 (2013.01); B21D 22/30 (2013.01); B65D 1/40 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A draw-ironed blank can having a can body made of an aluminum alloy, wherein on an outer surface of the can body, a ratio Ra1/Ra2 of an arithmetic mean roughness Ra1 measured in a circumferential direction and an arithmetic mean roughness Ra2 measured in a direction of height is from 0.5 to 1.5, the arithmetic mean roughness Ra1 being not more than 0.030 μm, and a brightness ratio which is measured by an LCH (Lightness, Chroma, and Hue) method and represented by the following formula is from 0.7 to 1.3,
brightness ratio =L15w/L15h
wherein,
L15w is a brightness value of a light reflected by the outer surface of the can body having an angle of 15 degrees based on a specular light in the circumferential direction of the outer surface of the can body,
L15h is a brightness value of the light reflected by the outer surface of the can body having an angle of 15 degrees based on a specular light in the direction of height of the outer surface of the can body, and
said brightness value L15h is not less than 50.