Ultrasonic welding technology achieves efficient welding of zippers through the frictional heat effect generated by high-frequency mechanical vibration (usually 20-40kHz). Its working principle is to convert electrical energy into high-frequency signals through an ultrasonic generator, convert them into mechanical vibration through a piezoelectric ceramic transducer, and transmit them to the contact surface of the zipper material through a specially designed welding head (amplitude amplified 10-20 times), causing thermoplastic materials (such as polyester and nylon) to melt at an instantaneous high temperature of 120-250 ℃, and recombine molecular chains to form solid connections under the action of pneumatic pressure of 0.2-0.6MPa. This process system includes a precision bottom mold (tolerance ± 0.02mm) and a three-dimensional contour welding head (error<0.05mm). By strictly controlling parameters such as amplitude (30-60 μ m), welding time (0.5-3 seconds), and trigger pressure (150-400N/cm ²), welding can be completed within 0.3-1.2 seconds of ultrasonic action time and 0.5-2 seconds of holding time. After cooling, a sealed connection with a strength of 85% -95% of the base material and a surface smoothness Ra<1.6 μ m can be formed. Compared to traditional sewing techniques, this technology has high efficiency with a single piece cycle of less than 3 seconds, fully waterproof molecular level sealing, and no exposed stitches, making it particularly suitable for industrial production of high-end waterproof zippers and medical protective equipment.