JPS649154A - Easy open can lid having good drop shock resistance - Google Patents

Abstract

PURPOSE:To enhance drop shock resistance and to reduce can opening force, by connecting both ends of the small semicircular score line around a rivet to both ends of the large semicircular score line in the vicinity of the outer periphery of a can lid by curved lines to form an endless tear opening part. CONSTITUTION:Since the breakage of a score line due to an impact is easy to generate when impact force causes the bending deformation along the score line, in a can lid 1, a tear opening part is constituted by forming the score line 3 by connecting both ends of a small semicircular part 3a and a large semicircular part 3b by a curved score line curved to the outside, that is, a curved part 3c and the generation of bending deformation along the score line due to shock generated when a can drops is suppressed. Therefore, drop shock resistance can be improved without damaging can openability and the use of steel to the can lid for an internal pressure can of beer or cola to which aluminum is largely adapted becomes possible and, further, a problem from the aspect of the adaptation of aluminum to the can lid of a large diameter heavy can also be eliminated.