Introduction of ultrasonic plastic welder

Ultrasonic plastic welder is short for ultrasonic plastic welding machine, ultrasonic plastic welding principle is by the generator can produce high voltage, high frequency signal and by changing system, the signal is converted to high-frequency mechanical vibration, and on the plastic workpiece, through the surface and inner molecular friction and make the transfer to the interface temperature, when the temperature reaches the melting point of the workpiece itself, The workpiece interface quickly melts, and then fills the gap between the interfaces. When the vibration stops, the workpiece is cooled and shaped under a certain pressure, and the welding is achieved.



When the ultrasonic action on the thermoplastic plastic contact surface, will produce tens of thousands of high-frequency vibration per second, this high frequency vibration to a certain amplitude, through the welding parts of the ultrasonic energy transmission to the welding area, because the welding area is two welding interface at the sound resistance, so will produce local high temperature. And because of the poor thermal conductivity of plastic, it can not be timely distributed, gathered in the welding area, resulting in the rapid melting of the two plastic contact surface, plus a certain pressure, so that the fusion into one. When the ultrasonic wave stops, let the pressure continue for a few seconds, so that it solidifies, so that a strong molecular chain is formed, to achieve the purpose of welding, welding strength can be close to the strength of the raw material. The quality of ultrasonic plastic welding depends on the amplitude of the transducer welding head, the pressure and welding time, welding time and welding head pressure can be adjusted, the amplitude is determined by the transducer and the horn. There is an appropriate value for the interaction of these three quantities. When the energy exceeds the appropriate value, the melting amount of plastic is large and the welding is easy to deform. If the energy is small, it is not easy to weld, and the pressure added can not be too large. This pressure is the product of the edge length of the weld and the pressure per 1mm of the edge.

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