Development of Technology and Equipment for Ultrasonic Planimetric Welding of Polyethylene Products

The specifics of ultrasonic planimetric welding of polyethylene containers of irregular shape filled with foodstuff are considered in this work. A planimetric wave guide that can be used for welding polyethylene containers of a large diameter (up to 120 mm) and thickness ranging from 0.4 to 1.5 mm is proposed and implemented. The issue of obtaining high-quality leak-tight weld joints with stable mechanical properties on the surface of a polyethylene container exposed to corrosive environment is resolved. Various shapes of the working surface of the planimetric wave guide are developed, making it possible to weld containers with good appearance, durability and leak-tightness. A scheme for welding containers by a planimetric wave guide with an acoustic screen is proposed. The results of studies to determine the optimal parameters for the modes of ultrasonic planimetric welding are presented. The shape, material and position of the support in relation to the planimetric wave guide are defined. The technology and equipment for ultrasonic planimetric welding of polyethylene cans of a large diameter filled with various substances and foodstuff are developed. As the result of the research, all the studied liquids are divided into three groups depending on their influence on weldability.

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