Ink drying method and ink drying device

An objective of the present invention is to significantly shorten drying time of ink which is applied to a substrate by modifying overheated dry vapor to have optimal characteristics in ink drying. By applying jet energy to overheated dry vapor in which saturated moisture vapor is heated and dried, particles of the overheated dry vapor are miniaturized and clustered, and by applying impact energy to the clustered overheated dry vapor, the clustered particles of the overheated dry vapor are further miniaturized, generating nano-size overheated dry vapor. By supplying the nano-size overheated dry vapor in a supersaturated state into a chamber in which a substrate is placed and forming an anoxic atmosphere within the chamber, and the nano-size overheated dry vapor in the anoxic atmosphere infused into ink molecules and molecular boundaries, the energy of the nano-sized overheated dry vapor is applied to the ink, and the moisture of the ink is evaporated and the organic solvent of the ink is either degraded or reduced.