1.Raw material preparation: High-quality polypropylene chips are selected as raw materials, and after drying treatment, ensure that the moisture content of the raw material meets the requirements of spinning.

2.Melt extrusion: The dried polypropylene chips are fed into the screw extruder and heated to a molten state, forming a uniform melt.

3.Spinning: The melt is extruded through the spinneret to form primary fibres by precisely controlling the flow rate through the metering pump.

4.Stretching: The primary fibres are stretched in multiple stages under the action of high-speed airflow or mechanical devices, so that the molecular chains are highly oriented to form high-strength FDY yarns.

5.Winding: The stretched fibres are cooled, oiled, etc., and then wound into tubes for subsequent processing and use.