Coating film drying method

Abstract

A coating film drying method includes a coating process for applying a waterborne coating to a work and forming a coating film on the work, so that a coated member is produced from the work, a preliminary drying process for heating the coated member and preliminarily drying the coated member until a nonvolatile content of the coating film reaches a percentage ranging from 70% to 90%, a final drying process for heating and drying the coated member until the nonvolatile content of the coating film reaches a percentage of 97% or more and a cooling process for cooling the coated member until a surface temperature of the coated member is decreased to a temperature at which the coated member is touchable by hand, whereby the preliminary drying process is carried out by repeatedly heating and cooling the coated member at a predetermined frequency to preliminarily dry the coating film.

Dependencies are inferred from the claim text.