| 摘要 |
<p>PURPOSE: To eliminate a defective shape resulting from weaked points brought in a can body while forming the metallic can body and provide such an optimum shape for the can body as an effective loading stress can be obtained even in a thin wall. CONSTITUTION: A metal can body for a beverage can comprises a bottom end wall 2 and a generally cylindrical side wall 3. The side wall 3 comprises a bottom portion 4 connected to the bottom wall 2, a central portion 5 extending upwardly from the bottom portion 4, and a top portion 6 extending upwardly from the central portion 5 and terminating in an open end. The top portion 6 and bottom portion 4 are of greater wall thickness than the central portion 5 and are respectively connected to the central portion 5 through upper and lower annular zones 7, 8 of reducing wall thickness. The side wall 3 is provided with a plurality of parallel externally convex longitudinal ribs 10 equally spaced around the circumference and terminating within the zones of reducing wall thickness.</p> |
