Fiber Extrusion spinning (also called melt spinning) is a converting technique for the mass production of synthetic filament yarns.
The molten polymer is extruded through a number of very small holes called a spinneret. After being extruded by the spinneret, the polymer solidifies into a yarn shape. At this point in time, the yarn is mostly low-oriented and needs to be drawn.
Polypropylene (PP) is a widely used resin for fiber extrusion.