... bags.7. Catching arm adopts air cylinder control, chain feeding system to feed the bags to punching area.8. Punching unit adopts ... the boards life.9. Sealing and cutting unit adopts microcomputer control, to set and show the speed, length, batch and quantity, ... working life and stable.With “Point-to-cut” buttons, for easy machine adjusting.13. Bag making control motor is step motor, high precision ...