With the acceleration of industrialization, plastic welding is no longer used as bonding. When a company receives two projects that require welding plastic, most engineers will consider using ultrasonic welding. Because ultrasonic welding is a high-tech welding method, this ultrasonic welding method does not need glue, there is no pure heating molten plastic odor, ultrasonic welding speed is very fast, only a few seconds to complete the welding of the product, welding products beautiful appearance without damage. Ultrasonic welding machine is more and more favored by the majority of users. But in the use of ultrasonic welding machine, there are several aspects of the problem need to cause the attention of the production department, otherwise it may make the product ultrasonic welding bad, resulting in the rise of reject rate.

Poor ultrasonic welding refers to: 1. The upper and lower cover of plastic parts is not completely welded, resulting in welding errors and weak welding; 2. Scratches on the surface of welded plastic parts, appearance damage; The upper and lower cover of plastic parts is misplaced.

To solve the above problems, attention should be paid to: first, adjust the downward pressure, downward pressure and plastic products of ultrasonic welding effect has a great relationship. Under normal conditions, plastic products are produced by ultrasonic vibration friction heat to achieve the effect of welding. The welding is not done by pressure, it is done by pressure. So the size of the pressure is very critical, must pay attention to!
Two, the product surface paste protective film or ultrasonic welding pad protective film. Each customer's ultrasonic welding requirements vary greatly, some product surface is not beautiful, ultrasonic welding can be firm, do not need to pay attention to the appearance. But in most cases, the ultrasonic welding requirements of products are relatively high, such as U disk, mobile phone battery, SD card, mouse receiver, etc., how to solve the problem of broken scratches on the product surface has been troubled the adjustment engineers of ultrasonic welding machine. To solve this problem, we need to start from many aspects, such as the cooperation between ultrasonic mold and product, whether the ultrasonic mold is smooth.
Three, adjust the ultrasonic welding time. The length of ultrasonic welding time directly affects the quality of ultrasonic welding products, too long time will be embossing on the surface of the product, too short time will appear welding is not firm, welding easy to fall off and so on. Only adjust to the appropriate time according to the specific product needs is a good choice.

4. Product positioning mechanism. In the design of ultrasonic welding plastic products, it is necessary to design the alignment mechanism of the upper and lower plastic parts according to the characteristics of the product, in order to avoid the phenomenon of dislocation during ultrasonic welding.