Can manufacture
View Patent ↗A metal can body formed from a base stretching, drawing, and ironing process has a base having a hardness that is greater than the raw sheet, a thickness that is less than raw sheet, and a grain aspect ratio that is elongated relative to the raw sheet.
1. A drawn and ironed T4 tin plate can body adapted for seaming onto a can end, the can body comprising:
an ironed sidewall;
an unironed, enclosed, undomed base integrally formed with the sidewall, a bottom panel of the base having an average Rockwell 30T hardness number that is more than 64.
2. The can body of claim 1 wherein average Rockwell 30T hardness number is between 64 and 70.
3. The can body of claim 1 wherein average Rockwell 30T hardness number is approximately 68.
4. The can body of claim 1 wherein the base panel has an average thickness of between about 0.006 inches and 0.015 inches.
5. The can body of claim 1 wherein the sidewall has a flange capable of being double seamed to a curl of a can end.