Production of polypropylene (PP) nanofibers below 1 m in average diameter is difficult with conventional melt-spinning. A nozzle-free melt-type electrospinning (M-ESP) system with a line-like CO2 laser beam melting device were used to produce PP nanofibers. To achieve the purpose, core [poly(ethylene-co-vinyl alcohol) (EVOH)]-clad (PP) nanofibers (average diameter, 0.88 m) were fabricated from PP/EVOH/PP three-layer films using the M-ESP. The core-clad structure was formed by a wrapping phenomenon caused by the difference in the melt flow rates (MFRs) of PP and EVOH melts. Hollow PP nanofibers were obtained from the core-clad nanofibers by extraction of EVOH. Nanofiber diameter and hollow wall thickness could be altered by changing the MFR of the PP melt. (c) 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46393.