The principle of ultrasonic welding: When ultrasonic waves act on the contact surface of thermoplastic plastics, they will generate tens of thousands of high-frequency vibrations per second. This high-frequency vibration, which reaches a certain amplitude, transmits ultrasonic energy to the welding area through the upper welding piece. Due to the high sound resistance at the interface between the two welding areas, local high temperatures will be generated. Due to the poor thermal conductivity of plastics, they cannot dissipate in a timely manner and accumulate in the welding area, causing the contact surface of the two plastics to quickly melt. After adding a certain amount of pressure, they merge into one. After the ultrasound stops working, let the pressure continue for a few seconds to solidify and form a strong molecular chain, achieving the purpose of welding. The welding strength can be close to the strength of the raw material.
