| 摘要 |
PROBLEM TO BE SOLVED: To avoid unexpected opening caused by contacting with other articles, and render unsealing noticeable at a glance when unsealed, by providing a recessed part surrounded by an opening line comprising a thin wall part at the opening part of a cap, and setting a pull tab at the recessed part, and further extending the opening line near the base part of the pull tab. SOLUTION: A cap 1 having a tamper prevention function (a tamper-proofing property) includes a trunk part 4 and unsealing part 2, and a cup-like recessed part 6 is formed in the unsealing part 2, and also a pull tab 7 is integrally formed at the bottom part of the recessed part 6. In the unsealing part 2 of the cap 1, an opening line 5 is made along the periphery of the recessed part 6; furthermore, the opening line 5 is extended in the proximity of the base part of the pull tab 7. Upon unsealing, when the pull tab 7 is pulled, unsealing is started from the proximity of the base part of the pull tab 7. Thus, unsealing advances while tearing an opening line 10 consisting of a thin wall part at the side wall part of the recessed part 6; finally, a round is made about the opening line 5 consisting of the thin wall part at the unsealing part 2, thereby tearing the recessed part 6 for removal. |
