Abstract : This article mainly introduces the application of Ningmao frequency converter products in the paper plastic agent transformation. Keywords : tension control extruder TG gas proportional regulating valve 1 Introduction The entire control system is mainly used to produce kraft paper plastic sealing tape, and to perform coating on kraft paper. Since it is a continuous production system, the kraft paper coating production process involves the following steps: first, unwinding, electrostatic punching, coating, cooling with silicone oil, baking and heating, cooling again, and finally winding and forming. In this process, it is necessary to complete the unwinding strength control, synchronous traction tension control, winding tension control, and pressure control of the winding surface. Due to the inherent drawbacks of the original system, the following problems exist: (1) uneven coating; (2) blistering of paper plastic film; (3) uneven winding and cutting; (4) high maintenance cost of DC speed control equipment; (5) the transmission speed ratio adjustment of winding cannot meet the satisfactory requirements, such as insufficient winding tension, resulting in small roll diameter and waste of materials and labor. To address the above issues, our company undertook the renovation of the paper-plastic machinery at Mingtian Paper & Plastic Co., Ltd. [b][align=center]For details, please click: Application of Frequency Converters in Paper-Plastic Machinery Renovation[/align][/b]