Process of making nanofibers

A method for producing nanofibers, comprising steps of:

• rotating a container comprising a cylindrical peripheral wall part with a double-walled structure which includes:
• an inner space having uniform depth in a radial direction, for holding a raw material liquid containing a polymer material;
• and
• an outer peripheral wall having orifices for extrusion of the raw material liquid in a radial direction by centrifugal force,
• the container being rotated around an axis of the cylindrical peripheral wall part, and at least an opening edge of each of the orifices being made of a conductor;
• pressurizing the raw material liquid filled in the inner space;
• allowing the raw material liquid to be electrically charged with an electrical charge induced on the container, and then allowing the electrically-charged raw material liquid to be extruded from the orifices by a centrifugal force from the container rotation and by a pressure from the raw material liquid pressurization;
• and
• allowing the extruded raw material liquid to form a fibrous material by a Coulomb force from the electrical charge with which the raw material liquid has been electrically charged.