The most common frequency of ultrasonic welding machine is 15khz and 20khz ultrasonic plastic welding machine. The higher the ultrasonic frequency is, the better the welding accuracy is, but the smaller the relative power is, the smaller the amplitude is.

The following is the difference between 15khz and 20khz ultrasonic plastic welding machine: low ultrasonic frequency will produce noise, when the frequency is lower than 20khz, ultrasonic welding noise becomes very large. The higher the welding accuracy of plastic products, the higher the frequency is better. Therefore, ultrasonic welding machine of 20khz or higher frequency is suitable for precise, ultra-thin and very fragile plastic parts, such as SD card, or products with crystal vibration inside the product; 15khz ultrasonic welding machine power is easier to do, the amplitude is relatively large, suitable for welding larger, difficult to weld, relatively rough plastic products; In appearance, the transducer of 15khz ultrasonic plastic welding machine and 20khz ultrasonic plastic welding machine can be distinguished. The transducer of 15khz ultrasonic machine is generally inverted cone, and the screw hole specification is M16X1.0 teeth, while the transducer of 20khz ultrasonic welding machine is generally cylindrical with small diameter, and the screw hole specification is 3/8 inch 24 teeth in British system. Secondly, 15khz and 20khz ultrasonic mold sizes are also inconsistent. The height of 15khz ultrasonic mold is generally about 17cm long, while that of 20khz ultrasonic mold is about 12.5cm long. Again, 15khz ultrasonic plastic welding machine can weld larger workpiece, power can be divided into 2600W, 3200W, 4200W. And 20khz ultrasonic plastic welding machine for 1500W- 2400W, small power, welding product size is small. 15khz and 20khz ultrasonic plastic welding machine is not good or bad quality, but applicable to different product occasions. Specific use of what kind of frequency machine, not mechanically mechanically, to consider the problem.