| 摘要 |
PROBLEM TO BE SOLVED: To provide a screw cap with a seal which is set such that a sealing ring for preventing unauthorized unsealing can be broken when unsealing, so as to be detached from a container body and sorted to be discarded, but is not broken when it is attached to the container body.SOLUTION: A sealing ring provided successively at the lower end of a cap body by a plurality of breakable weakened coupling pieces and a coupling part having a higher strength than the weakened coupling pieces is an annular band whose ends are coupled by a breakable connection piece, wherein a plurality of engaging pieces engaged with a lower projecting line on the outer periphery of a mouth of the container body are disposed in a peripheral direction at the lower part of the inner periphery. The connection piece includes an upper connection piece provided on the leading end face of an upper band end extending in a thread engagement releasing direction at the upper part of one end of the band, and a lower connection piece provided on the leading end face of a lower band end extending in a thread engagement direction at the lower part of the other end, and then the coupling part is provided at the upper part in the vicinity of the leading end of the upper band end. |
