Ultrasonic hollow plate welding machine is also a type of ultrasonic plastic welding machine, also known as turnover box welding machine, corrugated plate welding machine, ultrasonic hollow plate welding machine, or hollow plate edge sealing machine. The working principle is to transmit ultrasonic energy to the welding area through the upper weldment. Due to the high sound resistance at the interface between the two welding areas, local high temperatures will be generated. Due to the poor thermal conductivity of plastic, it cannot be released in a timely manner and accumulates in the welding area, causing the contact surface of the two plastics to quickly melt. After applying a certain amount of pressure, it merges into one. After the ultrasonic stops working, the pressure is allowed to continue for a certain amount of holding time to solidify and form a solid molecular chain, achieving the purpose of welding. The welding strength can be close to the strength of the raw material itself.