| 摘要 |
<p>PURPOSE:To increase strength of a can bottom more than a conventional aluminum can by specifying a curvature radius of a dome part including an axial line of a can body with respect to an outer diameter of the can body, a depth from a top part of an imaginary arch drawn along a counter part to a tip end of an earthing part and a distance between curvature centers of the both earthing parts which are positioned symmetrically with respect to the axial line of the can body. CONSTITUTION:An earthing part 3 projected in a ring outwardly in an axial direction of a can body 1 is formed on an outer periphery of a can bottom 2 of the can body 1. A dome part 4 recessed in a semi-ball inwardly in the axial direction of the can body 1 is formed inside of the earthing part 3. A counter part 5 curved drawing an arch-shaped cross section which is contact with these dome part 4 and earthing part 3 is formed at a crossing part of the dome part 4 and earthing part 3. In this constitution, when an outer diameter of the can body is represented by (D), a curvature radius of the dome part in perspective view including the axis of the can body is by (R), a depth from a top part of an imaginary arch drawn along the counter part to a tip end of the earthing part is by (h),and a distance between curvature centers of the both earthing parts which are positioned symmetrically with respect to the axial line of the can body is by (d), the following expressions are satisfied; 5.04D<=R<=0.76D, 0.07D<=h<=0.09D and 0.72<=d<=0.765D.</p> |
