Influence of parameters of ultrasonic seam welding of films on the process of formation of welded joints

The technology of ultrasonic seam welding of polymer films has been developed. It is shown that the parameters that determine the performance of the process of ultrasonic seam welding of polymer films are the amplitude of waveguide oscillations, welding static pressure and welding speed with a fixed gap on a rotating support roller with auto-stabilization of the thickness of the welded joint, the frequency of ultrasonic vibrations and the length of the contact spot of the end face of the welding waveguide. tool in the welding direction. It is determined that with an increase in the length of the contact spot of the end of the waveguide, the speed of seam welding increases linearly. The kinetics of the formation of welded joints in the heat-affected zone of polymer films obtained at various values of the parameters of the ultrasonic welding mode is given. It is shown that the contamination of welded film surfaces with liquid or bulk products does not affect the weldability and strength of welded joints. To increase the strength and quality of the welded joint, as well as to reduce heat removal to the waveguide and support, it is recommended to use heat-insulating spacers made of cellophane or paper. The influence of the thermal mode of ultrasonic welding on the residual thickness of welded joints of polymer films at high process productivity, good strength and absence of destruction of welded films was studied.
EDN: UTJATJ, https://elibrary/utjatj

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