The molten polymer is extruded through a spinneret composed of capillaries where the resulting filament is solidified by cooling.
The pellets are compressed, heated and melted by an extrusion screw, then fed to a spinning pump and into the spinneret.
A spinning solution consisting of polymer and a volatile solvent is extruded through a spinneret into an evaporating chamber.
A stream of hot air impinges on the jets of spinning solution emerging from the spinneret, evaporating the solvent, and solidifying the filaments.
The polymer is dissolved in a spinning solvent where it is extruded out through a spinneret submerged in a coagulation bath composed of nonsolvents.
The fibers are first cooled either with air or in a liquid bath to induce gelation, then the solvent is removed through ageing in a nonsolvent, or during the drawing stage.
The process does not require the use of coagulation chemistry or high temperatures to produce solid threads from solution.