1.2 Sample preparation
Luminous polypropylene spun-bonded nonwoven was obtained using the spun-bonded technique, which is an integrated nonwoven technology consisting in linking fiber-forming process with a web-forming process. The strings of molten polymer come out from the extruder head through the multi-hole nozzle where they are blown up by a stream of compressed air and set as fine fibers on a collecting drum (Fig. 1). It is possible to produce monofilaments of different thicknesses through adjusting the process parameters.