Abstract: The present invention provides a method for drying a coating film comprising drying a coating film of an organic solvent-containing coating liquid applied to a running band-shaped flexible substrate, the drying method comprising the steps of: providing a heater at a position opposed to the band-shaped flexible substrate at a running position immediately after coating; and heating the band-shaped flexible substrate by the heater; wherein when TW( ° C.) denotes the surface temperature of the band-shaped flexible substrate; TH( ° C.) denotes the surface temperature of the heater; ?(W/m·K) denotes the heat-transfer coefficient of air; d(m) denotes the distance between the heater and the band-shaped flexible substrate (web); ? denotes the efficiency of heat transfer; and ? denotes the Stefan-Boltzmann constant (5.670×10?8 W/m2K4), the ratio of radiant heat transfer represented by QR/(QR+QC) is 0.25 or more and 0.

Abstract: The present invention provides a method for drying a coating film comprising drying a coating film of an organic solvent-containing coating liquid applied to a running band-shaped flexible substrate, the drying method comprising the steps of: providing a heater at a position opposed to the band-shaped flexible substrate at a running position immediately after coating; and heating the band-shaped flexible substrate by the heater; wherein when TW (° C.) denotes the surface temperature of the band-shaped flexible substrate; TH (° C.) denotes the surface temperature of the heater; ? (W/m·K) denotes the heat-transfer coefficient of air; d(m) denotes the distance between the heater and the band-shaped flexible substrate (web); ? denotes the efficiency of heat transfer; and ? denotes the Stefan-Boltzmann constant (5.670×10?8 W/m2K4), the ratio of radiant heat transfer represented by QR/(QR+QC) is 0.25 or more and 0.

Abstract: An aspect of the present invention provides a method for drying a coating film that has been formed by applying a coating liquid to a traveling long support, by forming a tunnel-shaped drying zone so as to surround the support, and supplying drying air into the drying zone from a rectangular air-supplying nozzle which faces to the drying zone, wherein the air-supplying nozzle is designed so that among layer components of the drying air which is supplied from the air-supplying nozzle, a boundary layer component which has flowed in the vicinity of the inner wall surface of the air-supplying nozzle and is supplied from the nozzle cannot hit the surface of the coating film, while there are the boundary layer component and a central layer component which has flowed in a central part of the air-supplying nozzle and is supplied from the nozzle, in the layer components.