| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a metal cap with a button function which can effectively hold the button function even by increasing in thickness of a top board. <P>SOLUTION: The metal cap with the button function comprises a metal cap shell equipped with the top board and a cylindrical side wall falling downward from the peripheral edge of the top board, and a liner for sealing provided on the inner face of the top board of the cap shell. The top board is constituted so that a plurality of circular thin-walled lines for accelerating deformation of the top board caused by change in pressure in a container are formed in concentric circle-like shapes. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
