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Polypropylene (PP) fibers are generally applied for the production of industrial materials (e.g., rope, canvas, tent cloth, carpeting, and fishing nets). Polypropylene is the lightest chemical fiber, and it provides both high strength and high chemical resistance. PP fibers are produced industrially by melt spinning, and PP fibers have been prepared by using melt electrospinning (M-ESP) [1]. Lyons and colleagues reported the dependence of the diameter of PP fibers on the viscosity of the PP, and they developed a melt extruder by grounding the nozzle and by applying high voltage to the collector [2]; they were unable to produce PP nanofibers with an average diameter <1 μm, however. The first report of the production of PP nanofibers using M-ESP was by Warner et al. [3], but the nanofibers that they obtained were mixed to some extent with PP microfibers. A viscosity-reducing additive used with PP was introduced by Dalton et al., and their method resulted in a reduction of the melt electrospun fiber dia. from 35±8 μm to 840±190 nm [4]. Nayak et al. attempted to prepare PP nanofibers by using M-ESP from their PP melts by the addition of conductive compounds, i.e., sodium oleate (SO) or sodium chloride (NaCl) [5], and the fiber dia. obtained from the pure PP melt was 3.01 μm. However, their PP nanofibers (average dias. 606 and 780 nm) were prepared by adding SO at 7% and NaCl at 7%, respectively. An experimental study and theoretical prediction of the diameter of melt-electrospun PP fibers was reported by Shen et al., but the fiber dias. were >2 μm [6]. Daenicke et al. prepared PP nanofibers by the addition of sodium stearate (6 wt%) and Irgastat P 16 (2 wt%) during the M-ESP process [7]. The fiber diameter was minimized to 210 nm by the optimized process. We note that the electrospinning systems used in the above-cited reports were designed as an extension of solution electrospinning, because they changed only the spinning liquids from the polymer solutions to polymer melts in reservoirs (e.g., syringes). We have designed a new nozzle-free M-ESP system for the mass production of nanofibers that includes a line-like CO2 laser beam melting device [8, 9]. This method enables us to directly form polymeric nanofibers from sheets. In our previous study, we 【SPECIAL EDITIONS on Annual Meeting-Transaction】

journal of fiber science and technology

Formation of Polypropylene Nanofibers from Poly(ethylene-&lt;i&gt;co&lt;/i&gt;-vinyl alcohol)/Polypropylene/Poly(ethylene-&lt;i&gt;co&lt;/i&gt;-vinyl alcohol) Three-Layer Sheets by Using Laser-Assisted Melt Electrospinning