Influence of the ultrasonic welding mode parameters on strength characteristics of the bonded fabric

The paper considers technological processes in manufacturing the bonded fabric that consists in obtaining the nonwoven webs and creating strong bonds between the fibers using ultrasonic welding. The web could include polypropylene, lavsan and capron. The paper shows that the nonwoven fabric is heated during the ultrasonic welding without heat exchange with the external environment. Fiber surface located in the layers adjacent to the waveguide is partially softened. The fibers located in the layers adjacent to the waveguide are passing completely into the viscous-flow state. The welding pressure indents the softened thermoplastic polymer material into the web inner layers and bonds them. As a result, the thermoplastic material between the waveguide and the support completely passes to the viscous-flow state. The weld seam takes the form of a transparent film and provides good strength. The paper establishes the experimentally obtained optimal parameters of the nonwoven web welding modes ensuring the welded seam highest strength. It analyzes the influence of the mode parameters deviation from the optimal values on the welded seam strength and quality. Additional parameters of the nonwoven bonded fabric ultrasonic welding mode are determined.
EDN: ASKPSR, https://elibrary/askpsr

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