PURPOSE: To uniformize the distribution of the coating compd. particles in a coating film by heating a cylindrical base from the inside thereof in an initial period of a drying to finger touch and preventing the movement of the particles in the radial direction within the coating liquid film occurring in the difference in the grain size or sp. gr. of the coating compd. components by the centrifugal force of rotation.
CONSTITUTION: After the coating liquid is applied on the surface of the cylindrical base 1, the base is subjected to a leveling rotation for a specified period of time and thereafter, hot wind is blown by a blower 15 into the cylindrical base 1 in the initial period of the drying to finger touch to accelerate the evaporation of the coating component solvent in the coated film 4. The gradient of temp. and concn. is generated in the coating liquid film 4 by evaporation and the temp. on the surface of the coating film 4 is lowered by the evaporation heat. The liquid near the base 1 is heated and is forced to move toward the surface of the coating film. Such convection is actively generated by the heating in the base 1 and the movement of the coating components is generated. The movement of the coating components in the radial direction within the coating liquid film 4 occurring in the difference in the grain size or sp. gr. of the coating components by the centrifugal force of rotation of the base 1 is, therefore, prevented. The coating compd. particles are uniformly distributed in the coated film in this way.
NAKAMURA KAZUNARI
MATSUSHIGE NAOKI
TANAKA SHIGETO
TAKEMURA TSUGUKO
