Patent ID: 8524140

Claim:
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.