Polypropylene FDY wire production process!

Raw material preparation: The selection of high-purity polypropylene slices as raw materials requires that the slices have a suitable molecular weight distribution and melt flow rate to ensure the stability of the subsequent spinning process and fiber quality. The slices are usually dried to remove moisture and impurities, preventing bubbles from forming during spinning or affecting the properties of the fibers.

Spinning: The dried polypropylene slice is added to the screw extruder, it is heated to melt, and then the melt is extruded through the small hole of the spinneret under certain pressure to form a fine flow of strands. The diameter of the spinneret and the number of holes determine the fineness and number of the FDY filament. In the spinning process, it is necessary to precisely control the spinning temperature, pressure, speed and other parameters to ensure the quality and uniformity of the tow.

Tensile: The primary fiber extruded from the spinneret has low strength and needs to be stretched to improve the orientation and crystallinity of the fiber, thereby increasing the strength and other properties of the fiber. The drawing process is usually carried out in stages under different temperature and speed conditions, and the tow is stretched by the drawing roller, and the drawing multiple is generally about 3-5 times.

Heat setting: There is a certain internal stress in the fiber after stretching, and the internal stress can be eliminated by heat setting treatment to stabilize the structure and performance of the fiber. Heat setting is usually carried out in a heated oven or hot plate, the temperature is generally between 150-180 ° C, and the treatment time depends on the variety and specifications of the fiber.

Winding: After heat shaping, the polypropylene FDY wire reaches the performance requirements of the finished fiber, and the wire bundle is wound into a certain specification of bobbin yarn through the winding equipment, so as to facilitate subsequent processing and use. During the winding process, parameters such as winding speed and tension should be controlled to ensure the winding quality.

If you are looking for a reliable  PP yarn supplier, Dongguan Donghong New Material Co., LTD. . is worth considering. Look forward to working with you to explore more application potential of PP yarn. If you have any needs or questions, please feel free to contact us.