Abstract: In this article, the characteristics of the main equipment and process for one-step spinning of nylon mother yarn are introduced, with the characteristics of the screw extruder, melt pipe system, spinning pack, quenching device and draw-winding machine introduced in details. By taking the production of the 264dtex/8f nylon mother yarn for an example, the features of high-speed spinning, drawing-winding-heatsetting processes are analyzed and discussed.

Key words: nylon monofilament; nylon mother yarn; one-step method