According to the inventive process and referring to the drawings, thermoplastic polymer such as polypropylene is processed in an extruder (not shown), for example, and forced through the extruder into the die 14 at inlet passage or hole 42 (FIGS. 1, 2, and 4) for delivery into the coat hanger cavity 86 and subsequent melt-blowing as described herein for the processing of carbonaceous fibers.