solution spinning

Solution spinning is a method for creating man-made fibers by extruding a polymer solution through a spinneret, a device with fine holes, to form filaments. This technique, one of the oldest for man-made fibers, was introduced industrially in the late 19th century.12

There are two main types of solution spinning:
* Wet spinning: The polymer solution is extruded into a coagulation bath, where the solvent is removed and the fiber solidifies. This method is economical and allows for high productivity.1
* Dry spinning: The solution is extruded into a heated column, causing the solvent to evaporate and leaving behind a solid fiber. This method is faster but generally produces smaller fiber bundles and is used for specialty fibers.1

After extrusion and solidification, the fibers are typically stretched to align the polymer molecules, which enhances their strength. A lubricant is then applied before the fibers are dried and wound onto spindles or cut into staple lengths.13