Artificial and synthetic fibers represent around the 60% of textile fibers used worldwide. Artificial fibers are obtained from renewable raw materials and can be assimilated to natural fibers. Synthetic fibers, on the other hand, derive from different polymers, obtained through chemical synthesis. Their main output is textile clothing, although they find significant use in furnishing and, to a greater extent, in the so-called "technical textiles" (i.e. in industrial sectors such as automotive, medical-surgical or building industry), but also in production of clothes for sports or for people defense. The production facilities are of considerable size and work continuously. The production is vertically integrated and involves the use of traditional polymerization technologies and technologies for the transformation of fibers.