Ultrasonic Plastic Welding Equipment
Principle of ultrasonic plastic welding
When the ultrasonic wave acts on the thermoplastic plastic contact surface, it will produce tens of thousands of high-frequency vibrations per second. This kind of high-frequency vibration with a certain amplitude will transmit the ultrasonic energy to the welding area through the upper weldment. Because the welding area is two The acoustic resistance is large at the welding interface, so local high temperature will be generated. In addition, due to the poor thermal conductivity of the plastic, it cannot be distributed in time for a while, and it gathers in the welding area, causing the contact surface of the two plastics to melt rapidly, and after a certain pressure is applied, it merges into one. When the ultrasonic stops, let the pressure continue for a few seconds to make it solidify and shape, thus forming a strong molecular chain, achieving 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 three factors: the amplitude of the transducer's welding head, the applied pressure and the welding time. The welding time and welding head pressure can be adjusted, and the amplitude is determined by the transducer and the horn. 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 welded material is easily deformed; if the energy is small, it is not easy to weld firmly and the applied pressure cannot be too large. The optimal pressure is the product of the side length of the welded part and the optimal pressure per 1mm of the edge.
Ultrasonic welding ultrasonic welding
Thermoplastics are a welding method in which two plastics are welded together due to the friction and heat generated by the surface molecules under the action of ultrasonic vibration.
Note for welding of thermoplastics:
A. The tongue and tongue design ensures convenient alignment during the welding cycle.
B. The welding wire is designed to be slender, but there must be enough meltable material to fuse the welding surface. The specific design method depends on what kind of workpiece equipment is used for welding. Welding pressure, vibration amplitude and other parameters are adjustable to ensure that the welding head can contact the welding surface and apply pressure. The lower workpiece is the pressure-receiving part and is placed in the bottom mold without moving. The welding head produces high-frequency ultrasonic waves, which makes the upper workpiece heat and vibrate, so that it can fuse with the lower workpiece. After the welding head stops vibrating, the pressure is maintained to cool the melting position. The entire welding time is mostly less than one second.
Welding advantages
Advantages of ultrasonic plastic welding: fast welding speed, high welding strength and good sealing;
Replace the traditional welding/bonding process, low cost, clean and pollution-free, and will not damage the workpiece;
The welding process is stable, and all welding parameters can be tracked and monitored through the software system. Once a fault is found, it is easy to eliminate and maintain.
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