The ultrasonic welding machine is mainly used for welding edge of the face mask , The welding principle of ultrasonic mask machine mainly uses ultrasonic technology to transmit ultrasonic energy to the welding area through the upper weldment. Due to the large acoustic resistance at the interface of two welding areas, local hi-gh temperature will be generated. Due to the poor thermal conductivity of materials such as chemical fiber, non-woven fabric, multi-layer cloth can not be distributed in time for a while, and they are gathered in the welding area, resulting in the rapid melting of the two contact surfaces. After a certain amount of pressure is added, they are integrated . which is fast, clean, safe, stable in performance and high in output .