| 摘要 |
A method and an apparatus for producing zippered bags at faster speeds speeding up the ultrasonic welding operation performs an ultrasonic welding continuously while the web of bag making film (2) and the zipper tape (8) are moving. To facilitate this improvement, the ultrasonic welding station is moved from the bag making machine, where the bag making film (2) and zipper tape (8) move intermittently, to a sealer frame, where the film (2) and zipper tape (8) move continuously. The ultrasonic welding apparatus comprises a pair of rotary elements (26, 28) one of which (26) is acoustically coupled to an ultrasonic transducer (48). One of the rotary elements (28) is provided with a protuberance (30) on its periphery that acoustically couples the zipper tape (8) to the energized rotary element (26) to cause welding. <IMAGE> |
