| 摘要 |
<p>A drawn aluminum can shell (10) has a peripheral crown which is double-seamed with an end portion (48) of an aluminum can body (50) to provide a can end having a generally flat center panel (12) connected by a curved panel wall (16) to an inner wall (17) of an annular U-shaped countersink (18). The countersink (18) has a generally cylindrical outer wall and an inner width less than the radius of the panel wall (16). The outer wall (24) of the countersink (18) connects with a lower wall portion of a frustoconical chuckwall (32) at a junction below the center panel (12), and an upper wall portion of the chuckwall extends to an inner wall of the crown at an angle of at least 16° with the center axis (11). In one embodiment, the chuckwall (32) has an intermediate generally vertical short riser portion (35’)connecting the wall portions, and the inner bottom width of the countersink (18’)is less than .040 inch.</p> |
