Technological Features of Ultrasonic Welding of Thin Polymer Films

In this paper, the choice of ultrasonic welding of thin polymeric films is justified and the advantages of ultrasonic welding over other welding methods are noted. The technology for ultrasonic welding of polymeric films of small thickness is developed. It is shown that the amplitude of waveguide vibrations, static welding pressure and the welding speed with a fixed clearance on the rotating roller-support with self-adjusting weld thickness, are the parameters that determine efficiency of ultrasonic welding of polymeric films. The influence of the thermal conditions of the residual weld thickness is examined. Ultrasonic welding can be used on surfaces covered with various substances. It is determined that ultrasonic vibrations do not have a specific effect on the weldability of polymeric films, i.e. ultrasonic welding is a purely thermal process that uses a particular energy source – ultrasonic vibrations. The effect of supports on the quality and bonding strength of ultrasonic welding of polymeric films is studied. It is noted that when an active support is used instead of a passive one, the strength and efficiency of welding increases.

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