Film forming method

Abstract

A film forming method includes coating a surface of a steel material with an ultraviolet cured paint controlled to a predetermined control temperature and then radiating the coated paint with ultraviolet rays to cure the coated paint and form the film. When the steel material surface is coated with the ultraviolet cured paint, the steel material surface temperature is controlled within a range of −5° C. to +20° C. with reference to the control temperature, whereby a film having an even thickness distribution can be formed on the surface of the steel material. In order to make the thickness distribution of the film formed on the surface of the steel material evener and prevent a visually-observable irregular pattern from occurring and improve the appearance of the film, it is preferable to control the surface temperature of the steel material within a range of 0° C. to +10° C. with reference to the control temperature.

Dependencies are inferred from the claim text.