| 摘要 |
PROBLEM TO BE SOLVED: To easily recognize whether a cap has been removed when the cap is to be removed from a spout. SOLUTION: The cap 10 includes a cap body 11 mounted on the spout 20 and a cylindrical ring 12 provided on an opening side of the cap body 11 via a thin portion 14. A plurality of blades 13 folded inward are attached to the cylindrical ring 12. When the cap body 11 of the cap 10 is rotated in a direction that the cap opens, the blades 13 and a ratchet 23 of the spout 20 are engaged to regulate circumferential motion of the cylindrical ring 12, and the thin portion 14 is broken to cause the cylindrical ring 12 to be separated from the cap body 11. Even if the spout 20 is turned over thereafter, the blades 13 come into contact with a circumferential protrusion 22, so that the ring 12 does not drop from the spout 20.
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