Detailed Working Principle Of Ultrasonic in Dairly Life

When the ultrasonic wave acts on the contact surface of thermoplastic plastic, it will generate tens of thousands of high-frequency vibrations per second. This high-frequency vibration with a certain amplitude will transmit the ultrasonic energy to the welding area through the upper weldment. Because the acoustic resistance of the welding area, that is, the interface of two welding, is large, local high temperature will be generated. In addition, due to the poor thermal conductivity of the plastic, it can not be released in time for a time, and it is gathered in the welding area, resulting in the rapid melting of the contact surface of the two plastics. After a certain pressure is applied, it will be fused into one. When the ultrasonic stops working, let the pressure last for a few seconds to solidify and form a solid molecular chain to 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 three factors: 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 horn. There is an appropriate value for these three quantities. When the energy exceeds the appropriate value, the melting amount of the plastic is large, and the weldment is easy to deform; If the energy is small, it is not easy to weld, and the pressure applied cannot be large. This optimum pressure is the product of the side length of the welded part and the optimum pressure per 1 mm of the edge.

In contemporary society, various plastic products have penetrated into various fields of people's daily life, and are also widely used in aviation, shipping, automobile, electrical appliances, packaging, toys, electronics, textiles and other industries. However, due to the limitations of injection molding process and other factors, a considerable number of plastic products with complex shapes cannot be injection molded at one time, which requires bonding. However, the plastic bonding and heat sealing process that has been used for many years is quite backward, which not only has low efficiency, but also has certain toxicity, causing environmental pollution and labor protection. The traditional process can not meet the development needs of modern plastic industry, so a new plastic processing technology ultrasonic plastic welding stands out with its advantages of high efficiency, high quality, beauty and energy saving. When welding plastic products, the ultrasonic plastic welder does not need to add any adhesive, filler or solvent, and does not consume a large amount of heat source. 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.