| 摘要 |
PROBLEM TO BE SOLVED: To provide a mouth plug of a paper container for liquid wherein cracks are not easily generated on an annular thin-walled fragile line of a spout by ultrasonic waves. SOLUTION: The mouth plug 10 consists of a spout 100 and a cap 200. In the spout 100, a pour cylinder 120 is erected on the inner circumferential edge of the upper surface of a base seat ring 110 having a temporary stop projection on the outer circumferential surface of its top end, and a closing plate 130 is sealed within the inner surface of a pour cylinder, and an annular incision 131 is provided on the closing plate 130 to form an annular thin-walled fragile line 132. A support 133 having a pull ring 134 at its forward end is erected on one side of the top surface near the inside of the line 132, while a flange 140 is provided on the outer circumferential surface of the lower end of the ring 110 and one or a plurality of annularly projecting directors 141 are provided near the center of the upper surface of the flange 140 along the outer periphery of the ring 110. |
