The Working Theory of the Ultrasonic Plastic Welding

- Mar 09, 2019-

When the ultrasonic wave ACTS on the thermoplastic contact surface, it will generate tens of thousands of high-frequency vibrations per second. This high-frequency vibration reaching a certain amplitude will transfer ultrasonic energy to the welding area through the upper welding piece. Because of the high acoustic resistance in the welding area, that is, at the junction of the two welding surfaces, local high temperature will be generated.


And as a result of plastic thermal conductivity is poor, still cannot send out in time temporarily, collect in welding area, cause the contact surface of two plastics to melt quickly, add after certain pressure, make its confluence becomes an organic whole.


When the ultrasonic wave stops working, the pressure is allowed to last for a few seconds to solidify and form a solid molecular chain. In this way, the welding strength can be close to that of the raw material.


The quality of ultrasonic plastic welding depends on the transducer welding head amplitude, the pressure and welding time and other three factors, welding time and welding head pressure can be adjusted, the amplitude is determined by the transducer and the amplitude of the rod.


There is an appropriate 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, added pressure can not be too big. The optimum pressure is the product of the edge length of the welded part with the optimum pressure per 1mm of the edge.


Advantages of ultrasonic plastic welding, quick welding, welding high strength, good sealing,

Replace the traditional welding/bonding process, low cost, clean and pollution-free and will not damage the workpiece;

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