Ultrasonic plastic welding machine works

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When the ultrasonic wave acts on the thermoplastic plastic contact surface, it will generate tens of thousands of high-frequency vibrations per second. This kind of high-frequency vibration reaches a certain amplitude, and the ultrasonic energy is transmitted to the weld zone through the upper weldment, because the weld zone is two. The welding interface has a large acoustical resistance and therefore generates local high temperatures. Because of the poor thermal conductivity of plastics, they can not be distributed in time and accumulate in the weld zone, causing the two plastic contact surfaces to melt quickly and add a certain pressure to fuse them into one. When the ultrasonic wave ceases to function, let the pressure persist for a few seconds to allow it to solidify and form a solid molecular chain so that the welding can be achieved. The welding strength can be close to that of the raw material. The quality of ultrasonic plastic welding depends on the amplitude of the transducer's welding head, the applied pressure and the welding time. The welding time and welding head pressure can be adjusted. 

The amplitude is determined by the transducer and the horn. The interaction of these three quantities has a suitable value. When the energy exceeds the appropriate value, the plastic melt volume is large, and the welding material is easy to deform; if the energy is small, it is not easy to weld firmly, and the added pressure cannot be too great. This optimal pressure is the product of the side length of the welded part and the optimal pressure per 1 mm of the edge.
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