| Résumé : |
A stainless steel disc around 4 mm thick, is illuminated by a bright green beam of laser light. With high energy, the ultra-short-pulsed laser beam bores into the surface of the metal repeatedly, until a large number of hales have been made. What is produced at the Institute of Laser Technologies (IFSW) at the University of Stuttgart/Germany is the result of a joint research project together with the Instituts of Textile Chemistry and Chemical Fibers (ITCF) in Denkendorf/Germany: spinnerets with a diameter of 30-40 pm, much finer than a human hair, which are utilized in the production of ultra-fine cellulose fibers, or so-called micro- or supermicrofibers.
Microfibers which are made of different polymers finer than 1 dtex, that corresponds to 1 g per 10,000 m of fiber length. Supermicrofibers are fibers whose fineness is even less than 0.3 dtex. The diameter of such fibers is approx. 3 pm. Due to their large surface area, such fibers are particularly suitable for use in the fields of hygiene and medicine, due to the high moisture absorption capacity and the soft handle of textile products made from them. They are also effectively utilized within the industrial sector as technical textiles, for example in filters, as they are fine and extremely strong. |
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Laser drilled spinnerets for cellulose fiber with new properties in CHEMICAL FIBERS INTERNATIONAL, Vol. 67, N° 1 (03/2017)
