... Construction 4. Attractive design Ultrasonic Welding Machine Used on PE/PP/OPP Bag Machine 1. Usage: PE, PP, PVC, OPP material such as ... equipped with three-side sealing machine, ziplock bag machine, etc.2. Features:(1) Using ultrasonic welding, spot welding, etc. Bags that ... were welded by this machine look beautiful.(2) Strong and ...