Metallic Container Closure Having Internal Pressure Release Function
(57) Abstract
A metallic container closure including a shell of a thin metal sheet having a circular top panel wall ( 7 ) and a skirt wall ( 9 ), and a synthetic resin liner arranged in the shell, the skirt wall ( 9 ) having a thread-forming region and an annular groove ( 17 ) positioned at an upper end portion of the thread-forming region, wherein an internal pressure release line A extending in the circumferential direction is arranged in the skirt wall ( 9 ) at a portion over the annular groove ( 17 ), and annular bead ( 30 ) is arranged so as to pass through between the internal pressure release line A and the annular groove ( 17 ).
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