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When the ultrasonic effect on thermoplastic plastic contact surface, can produce tens of thousands of times per second high frequency vibration, this reached a certain amplitude of high frequency vibration, the welding pieces of the ultrasonic energy is transmitted into the weld area, since the welding zone whereby the two welding interface of acoustic impedance, thus generating the local high temperature. Because the plastic poor thermal conductivity, can not be distributed in time, gathered in the weld area, resulting in two plastic contact surface rapidly melting, coupled with a certain pressure, make it blend into one. When the ultrasonic ceases to function, so that the pressure for a few seconds, so that the solidified molding, so as to form a solid molecular chain, achieve the purpose of welding, welding strength can be close to the original strength of materials. Ultrasonic plastic welding depends on the amplitude of the transducer head, the pressure and the welding time and other three factors, welding time and welding pressure can be regulated, the amplitude of the transducer and ultrasonic amplitude transformer decision. This three volume interactions in a suitable value, energy over a suitable value, plastic melting welding on large quantity, easy deformation; if the energy is small, is not easy to weld, the pressure is not too big. The optimal pressure welding portion of the length and each of the edge1mm the best pressure product.

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