... three-side sealing machine, ziplock bag machine, etc.2. Features:(1) Using ultrasonic welding, spot welding, etc. Bags that were ... for feedback control circuit can be prolonged use.(4) Foot switch can be used without preheating, convenient to produce quickly.(5 ... ) Time control using three digit dial code switch, adjustable 1 / 100 seconds precision, easy to adjust.(6) Be compatible ...