| 摘要 |
PROBLEM TO BE SOLVED: To provide a coating film forming method by three coat one bake process capable of forming laminated coating films which excel in finish appearance, especially in feeling of luster and chipping resistance. SOLUTION: This coating film forming method includes a process of coating the surface of a base material formed with an electrodeposition coating film successively wet on wet with an intermediate coating material, a base coating material, and a clear coating material, and a process of baking and hardening the three coated layers at a time, in which the baking and hardening process includes a low-temperature heating stage of heating the coating films for a time of 5 to 30% of the hardening time at a temperature of 25 to 80% of the hardening temperature and a high-temperature heating stage of heating the coating films for a time of 30 to 130% of the hardening time at a temperature of over 80% of the hardening temperature and 120% or less of the temperature. COPYRIGHT: (C)2005,JPO&NCIPI
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