| 摘要 |
A sealing apparatus for packaging containers includes an anvil (23) for supporting a sealing fin portion (21), a horn (35) compose d of a columnar portion and a converging portion (35b), and means for pressing said sealing fin portion (21) against the anvil (23) through the tip of the horn (35) and for transmitting ultrasonic vibration to the sealing fin portion (21). Ultrasonic vibration is transmitted to the packaging material through the horn (35) so that each pair of opposing sealant layers is fused and sealed. In addition, means for absorbing ultrasonic vibration is disposed between the tip of the horn (35) and an edge portion (25) of the sealing fin portion (21) so th at ultrasonic vibration is absorbed. When ultrasonic vibration is transmitted to the sealing fin portion (21), the sealing fin portion (21) is excited to transmit the vibration toward the edge portion ( 25). However, since the ultrasonic vibration is absorbed by the means fo r absorbing ultrasonic vibration, the ultrasonic vibration is not transmitted to the edge portion (25). Accordingly, it is possible to prevent the generation of dust from an end surface of the paper substrate which is exposed at the edge portion (25) of the sealing fin portion (21) . |
