... .ultrasonic sealing 2.newest frequency adjust technology 2.Strong fasten,nice film sealing Auto Nylon Zipper Film Sealing Machine ... weight 190kg Features:1. ultrasonic sealing, adopting the newest auto frequency-adjustment technology; different from the traditional one(the ... pulls, ect. Zipper machines we can offer: gapping machine, auto gapping and bottom stop setting machine, film sealing machine, ...