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, they merge 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. But at the same time, the surface of the plastic product is also prone to scratches and burns during this process. In order to improve product quality and yield, reduce loss, so the ultrasonic press (welding machine) must use protective film.
Ultrasonic special protective film is a matte and translucent protective film material, without stickiness, no glue, soft and elastic material, high reusability, the number of uses is 5-8 times that of ordinary film, and the material contains Teflon , PE and other raw materials, the ultrasonic special protective film can well combine the pressure of the ultrasonic machine to protect the product during the pressing process. It can be reused several times or dozens of times to reduce Quantity, reduce costs, and reduce the defect rate of customers. According to the pressing force, frequency, and pressing time adjusted by the ultrasonic, the number of uses will be different. It can solve the injection plastic shell, ABS plastic shell, PC plastic shell, ABS+ PC plastic shell, nylon plastic shell and other electronics, toys, plastics and other products ultrasonic pressure welding protection and appearance problems in ultrasonic pressure welding.
