Introduction and working principle of ultrasonic plastic welding machine

Ultrasonic welding equipment is a high-tech technology for welding plastic products. All kinds of plastic plastic parts can be welded by ultrasonic welding. When welding plastic products, no adhesive, filler or solvent is added, and no large amount of heat source is consumed. It has the advantages of simple operation, fast welding speed, high welding strength, and high production efficiency. Therefore, ultrasonic welding technology is more and more widely used.

When the ultrasonic wave acts on the thermoplastic plastic contact surface, it will produce tens of thousands of high-frequency vibrations per second, which reach a certain amplitude. The ultrasonic energy is transmitted to the welding area through the upper weldment. Since the sound resistance of the welding area, i.e. the interface between two welds, is large, local high temperature will be generated. Due to the poor thermal conductivity of the plastic, it can not be distributed in time and is gathered in the welding area, resulting in the rapid melting of the contact surface of the two plastics. After a certain pressure is added, it is fused into one. When the ultrasonic wave stops acting, let the pressure continue for a few seconds to solidify and form, so as to form a solid molecular chain, which can achieve the purpose of welding, and the welding strength can be close to the strength of raw materials. The quality of ultrasonic plastic welding depends on the amplitude of the transducer welding head, the applied pressure and the welding time. The welding time and the welding head pressure can be adjusted, and the amplitude is determined by the transducer and the amplitude transformer. There is an appropriate value for the interaction of these three quantities. When the energy exceeds the appropriate value, the melting amount of plastic will be large, and the weldment will be easily deformed; If the energy is small, it is not easy to weld firmly, and the applied pressure cannot be too large. This optimum pressure is the product of the edge length of the welding part and the optimum pressure for every 1mm of the edge.

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