| 摘要 |
A form-fill-seal machine (1) has a tube (31), a sailor-collar-shaped part(32), and a vertical sealing mechanism (15). The sailor-collar-shaped part (32) wraps a sheet-shaped film (F) around the tube (31) so that two edges thereof define overlapping portions. The vertical sealing mechanism (15) ultrasonically seals the overlapping portions of the sheet-shaped film (F) in the vertical direction. The vertical sealing mechanism (15) has an oscillator (50) and a roller (54). The oscillator (50) generates ultrasonic waves. The roller (54) is disposed downstream of the oscillator (50) along the advancing direction of the film (F). The roller (54) holds down the film (F) while rotating in the advancing direction of the film (F) after the film (F) has passed the oscillator (50). |
