When the ultrasonic wave acts on the contact surface of the thermoplastic plastic, it generates a high-frequency vibration of tens of thousands of times per second. This high-frequency vibration can reach a certain amplitude, and the ultrasonic energy is transmitted to the welding through the upper weldment. Zone, because the weld zone is the sound resistance at the interface of the two welds, it will produce a local high temperature. Moreover, because of the poor thermal conductivity of the plastic, it is not possible to disperse in time and gather in the weld zone, which causes the contact surface of the two plastics to melt rapidly, and after a certain pressure, it can be fused into a composite body. After the ultrasonic wave stops, the pressure can be maintained for a few seconds, so that it can be solidified, so that a relatively strong molecular chain can be formed to achieve a welding purpose, and the welding strength can be close to the strength of the raw material. The quality of ultrasonic plastic welding depends mainly on three factors such as the amplitude of the transducer welding head, the applied pressure and the welding time. The welding time and the pressure of the welding head can be adjusted. The amplitude is changed by the transducer and the amplitude. The rod is thus determined. The interaction of these three quantities has a suitable value. When the energy exceeds the appropriate value, the melting amount of the plastic becomes larger, and the welded material is more likely to be deformed than the pile. If the energy is small, the pressure is not easily welded, and the applied pressure is applied. It can't be too big. The optimum pressure is the product of the side length of the welded portion and the optimum pressure per 1 mm of the edge.
Ultrasonic plastic welding machine
2017-02-10
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