| 摘要 |
PURPOSE: A preparation method of a coated composite film is provided to produce a film excellent in anti-chipping and an appearance, particularly gloss by a three-coat one-bake process. CONSTITUTION: The preparation method of a coated composite film comprises the steps of: forming an electrically coated film on a substrate, applying an intermediate paint, a base paint and a transparent paint continuously in a wet-on-wet process and then baking and hardening the applied three layers at one time, wherein the baking and hardening comprises a low temperature heating step for heating at a temperature of 25 to 80% of a hardening temperature for a time of 5 to 30% of a hardening time and a high temperature heating step for heating at a temperature of 80 to 120% of a hardening temperature for a time of 30 to 130% of a hardening time.
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