| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a can-top in which breakage of a seamed portion of a can body and the can-top when buckling occurs can be reduced.SOLUTION: A can-top 1 is seamed to a can drum and closes an opening end of the can drum. In the can-top 1, a chuck wall part 4 is provided with a first curved wall part 11 and a second curved wall part 12 which are annularly formed over the whole circumference in a circumferential direction and have curve-shaped longitudinal sections, and an annular groove part 3 includes an inner peripheral side part 6 which is so formed as to be connected to an outer peripheral edge of a center panel part 2, an inner peripheral side curved part 8 of which an inner peripheral edge 8a contacts an end 6a of the inner peripheral side part 6, and an outer peripheral side curved part of which an outer peripheral edge 9b contacts an inner peripheral edge 11a of the first curved wall part 11. A connection part 3b, which is connected to an outer peripheral edge 8b of the inner peripheral side curved part 8 from the inner peripheral edge 11a of the first curved wall part 11 is so configured to include at least a portion which is so formed as to have a curvature radius larger than a curvature radius r1 of the inner peripheral side curved part 8.</p> |
