| 摘要 |
PROBLEM TO BE SOLVED: To remarkably reduce the degree of engagement of an external wall with a container mouth when a cap is unsealed by forming a first weakened portion to be broken by erecting a pull ring on the external wall, and forming a second weakened portion continuous to the first weakened portion. SOLUTION: A first score comprising a groove of ridge-like section is formed as a first weakened portion on both sides across a connection portion to integratedly connect a pull ring 7 with an external wall on an outer surface of the external wall 4. Two second scores 13 continuous to the first score are formed on a top plate 6 in an extended manner to surround an intermediate plug 5. When a cap is unsealed, the first score is firstly broken to erect a portion between two first scores of the external wall 4, and the second score 13 is torn to pull out the intermediate plug 5. Since the tension is applied to the second score 13 as the shear force, the second score 13 can be torn with a very small force. |
