Works by oscillation circuit oscillation out high frequency signal by the transducer is converted into mechanical energy (i.e., beyond the human ear hearing threshold frequency of high frequency mechanical vibration can), the energy through the welding head conduction to the plastic workpiece, ultrasonic welding machine on the vibration of the hundreds of thousands of times per second and joint surface friction pressure make plastic workpiece after melting. The transient pressure maintained on the workpiece after the vibration has stopped makes the two welded parts solidified as a molecular link. Generally, welding time is less than 1 second, and the welding strength obtained is comparable to that of the body. The ultrasonic plastic welding machine can be used for the welding of thermoplastic plastic, and also used in the process of riveting, spot welding, embedding and excision. Design the mold size and shape according to the appearance of the product.
When ultrasonic wave ACTS on the thermoplastic plastic contact, will produce tens of thousands of times per second, the high frequency vibration, this reaches a certain amplitude of high frequency vibration, through the weldment sends the ultrasonic energy to the welding area, due to the welding area is two welding interface of the acoustic resistance is big, so can produce local high temperature. Due to the poor thermal conductivity of plastic, it can not be distributed in time, and it is concentrated in the welding zone, which causes the two plastic contact surfaces to melt quickly, and after a certain amount of pressure, it is integrated into one. When ultrasonic stop function, to keep the pressure for a few seconds, make its solidification molding, forming a strong chain, achieve the purpose of welding, the welding strength can close to the raw material strength. Good or bad depends on ultrasonic plastic welding welding head, the amplitude of the three factors such as the pressure and welding time, welding time and welding head pressure can be adjusted, amplitude is determined by the transducer and amplitude. There is a suitable value for the interaction of these three quantities. When the energy exceeds the appropriate value, the melting amount of the plastic is large and the welding material is easy to deform. If the energy is small, it is not easy to weld, and the pressure can not be too large. This optimum pressure is the product of the optimum pressure of the side length and the edge of the welding part per 1mm.