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In the manufacture of unitary sheet metal can bodies for vacuum-pack two-piece sanitary cans, a high-strength seamless chime is formed at the juncture of the sidewall and unitary endwall of the can body. The seamless chime comprises longitudinally oriented outer, intermediate, and inner wall portion

In the manufacture of unitary sheet metal can bodies for vacuum-pack two-piece sanitary cans, a high-strength seamless chime is formed at the juncture of the sidewall and unitary endwall of the can body. The seamless chime comprises longitudinally oriented outer, intermediate, and inner wall portions which define outer and inner circular channels about a peripheral portion of the unitary endwall. The remaining endwall panel, with reinforcing profile rings, extends substantially laterally from the inner wall portion of the seamless chime. The endwall panel can flex longitudinally under interval vacuum and pressure conditions without permanent distortion (implosive or bulging) of the can body sheet metal. A radially extended bead is roll formed in the sidewall contiguous to the seamless chime; the diameter of such bead is selected to compensate for the added diameter of a closure seam at the open end of the can body. The can sidewall is strengthened by reinforcing ribs rolled in the sidewall intermediate its longitudinal ends.

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