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Principle and theory of ultrasonic plastic welding
Latest company news about Principle and theory of ultrasonic plastic welding

When the ultrasonic wave is applied to 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. The ultrasonic energy is transmitted to the welding zone through the upper welding piece. The welding interface has a large acoustic resistance, so local high temperatures can occur. Also, due to the poor thermal conductivity of plastics, they could not be released in time and gathered in the welding zone, which caused the contact surfaces of the two plastics to melt rapidly, and after a certain pressure was applied, they were merged into one. When the ultrasound stops working, let the pressure last for a few seconds to make it solidify and form, so that a strong molecular chain is formed to achieve the purpose of welding, and the welding strength can be close to the strength of the raw material. The quality of ultrasonic plastic welding depends on the three factors of the transducer welding head amplitude, the applied pressure and the welding time. The welding time and the welding head pressure can be adjusted. The amplitude is determined by the transducer and the horn. These three quantities have a suitable value for each other. When the energy exceeds the suitable value, the melting amount of the plastic is large, and the welding object is easily deformed; if the energy is small, the welding is not easy, and the applied pressure cannot be large. This optimal pressure is the product of the side length of the welded part and the optimal pressure per 1 mm of the edge. Ultrasonic welding is a high-tech technology for welding thermoplastic plastic products. All kinds of thermoplastic rubber parts can be treated with ultrasonic welding without adding solvents, adhesives or other auxiliary products. The advantages are increased productivity and reduced costs. improve product quality.

Ultrasonic plastic welding principle: 20KHZ (or 15KHZ) high-voltage and high-frequency signals are generated by the generator, and the signals are converted into high-frequency mechanical vibration by the energy conversion system. The friction caused by the friction increases the temperature transmitted to the interface. When the temperature reaches the melting point of the workpiece, the welding joint of the workpiece melts rapidly, and then fills the gap between the interfaces. When the vibration stops, the workpiece is cooled and shaped at the same time under certain pressure to achieve perfect welding.


Pub Time : 2021-01-12 13:15:52 >> News list
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