The Technology of Manufacturing Fibrous Non-Woven Materials by Ultrasonic Welding

Technological processes of manufacturing non-woven materials are described in this article. The essence of the processes lies in manufacturing fibrous canvases and creating strong bonds between the fibers using ultrasonic welding. The canvas can consist of polypropylene, Dacron and kapron. It is established that the process of formation of the welded joint can be divided into three stages. The first stage sees partial softening of the fiber surfaces in the layers adjacent to the waveguide.  At the second stage, the fibers in the layers adjacent to the waveguide fully transition to the viscous-flow state, and the softened thermoplastic polymeric material is pressed by the welding pressure into the inner layers of the canvas while binding them. At the third stage, the thermoplastic material between the waveguide and the pillar fully transitions into the viscous-flow state. The seam takes the form of a transparent film and has good durability. It is established that heating of the fibrous materials by ultrasonic welding occurs without heat exchange with the environment. Optimal parameters of manufacturing nonwovens materials are determined.

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