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When ultrasound acts on the thermoplastic plastic interface, it produces tens of thousands of high-frequency vibration per second. This kind of high-frequency vibration reaches a certain amplitude. The ultrasonic energy is transmitted to the welding area through the welding parts. Because of the high acoustic resistance at the interface of the welding area, local high temperature will be generated. Because of the poor thermal conductivity of the plastic, it can not be distributed in time and gathered in the welding area, resulting in the rapid melting of the contact surface of the two plastics, together with a certain pressure, to make them merge into one. When the ultrasound stops working, let the pressure continue for several seconds to solidify and form a solid molecular chain, so as to achieve the purpose of welding, 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 joint, the applied pressure and the welding time. The welding time and the welding pressure can be adjusted, and 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 appropriate value, the melting amount of plastics will be large, and the welding material will be easily deformed. If the energy is small, it will not be easy to solder firmly, and the added pressure will not be able to achieve. This optimum pressure is the product of the edge length of the welded part and the optimum pressure per mm of the edge.
In contemporary society, all kinds of plastic products have penetrated into every field of people's daily life, but also widely used in aviation, ships, automobiles, electrical appliances, packaging, toys, electronics, textiles and other industries. However, due to the limitation of injection molding process and other factors, a considerable number of plastic products with complex shape can not be injected at one time, which requires bonding. The plastic bonding and thermal bonding process that has been used for many years is quite backward, not only inefficient, but also has certain toxicity, causing environmental pollution and labor protection. The traditional technology can not meet the development needs of modern plastic industry, so a new plastic processing technology - Suzhou Jiahui ultrasonic welding in plastic with its high efficiency, high quality, beautiful, energy saving and other advantages stand out. Ultrasound plastic welding machine, when welding plastic products, does not add any adhesives, fillers or solvents, and does not consume a large number of heat sources. It has the advantages of simple operation, fast welding speed, high welding strength and high production efficiency. Therefore, the ultrasonic welding technology is more and more widely used.
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