| 摘要 |
There is provided a method of drying a coating film formed on a surface of a PET film and a coating film drying furnace that can dry a coating film containing water or an organic solvent formed on a surface of a base film in a shorter period of time than by a conventional method, without generating a compression stress on the dried thin film. The method includes radiating an infrared ray having a dominant wavelength of 3.5 µm or less from an infrared heater 13 onto a PET film 1 on whose surface the coating film 2 containing water or an organic solvent having an absorption spectrum of 3.5 µm or less has been formed, where the infrared heater 13 has a structure such that an outer circumference of a filament 14 is covered with a protection tube 15;22, and a partition wall 16;23 for forming a flow passageway 17 of a cooling fluid that restrains rise in temperature of a heater surface is provided in a space surrounding this protection tube 15;22, and bringing a cooling air into contact with the surface of the PET film 1 on which the coating film 2 has been formed, so as to dry the PET film at a temperature lower than a glass transition point of the PET film. |
