| 摘要 |
PROBLEM TO BE SOLVED: To provide a pouring port stopper in which pinholes are hardly formed in a thin-walled brittle line at the time of ultrasonic welding and which has a structure capable of being separately collected at the time of disposing of the same as waste. SOLUTION: A pouring port stopper made of a synthetic resin has such a structure that a pedestal ring 100 is mounted to a mouth stopper fitting hole at the top of a cardboard container for a liquid by ultrasonic welding and that a blocking board disposed inside a pouring cylinder 200 provided upright at an inner peripheral upper edge of the pedestal ring is opened by tearing a thin-walled brittle line 310. In this pouring port stopper, an ultrasonic wave absorbing portion 120 is provided between a welded portion 110 of the container at an outer peripheral edge of the pedestal ring and the pouring cylinder. Alternatively, an annular thin-walled brittle line is formed in an outer underface of the pouring cylinder provided at the pedestal ring, a support having a pull ring is provided in a suspended state on the underface of the pedestal ring on the inner side of the annular thin-walled brittle line, and an ultrasonic wave absorbing portion is provided between the welded portion of the container at the outer peripheral edge of the pedestal ring and the annular thin-walled brittle line. |
