Process Flow of the Automobile Bumper Skid Coating Line

Drying

After the pre - treatment, the bumpers enter the drying chamber to be dried, removing the moisture and solvents on the surface to make the bumper surface dry. The drying temperature and time are adjusted according to the material of the bumper and the coating requirements. Generally, the drying temperature ranges from 100°C to 150°C, and the drying time is between 10 and 30 minutes.

Primer Spraying

The dried bumpers enter the primer spraying station. A spray gun is used to evenly apply the primer on the surface of the bumpers. The primer serves to provide good adhesion and anti - corrosion performance, laying the foundation for the subsequent top - coat spraying. The spraying thickness of the primer is generally between 15 and 25 microns. During spraying, the pressure, flow rate, and spraying distance of the spray gun need to be well - controlled to ensure the uniformity and quality of the primer.

Leveling

After the primer spraying, the bumpers go through a leveling stage. This allows the primer to fully level on the surface, eliminating defects such as orange peel and runs caused by the spray gun during spraying. The leveling time is generally 5 to 10 minutes. During the leveling process, the environment should be kept clean and well - ventilated to prevent dust and impurities from falling on the bumper surface.

Drying

The leveled bumpers enter the drying chamber again to cure the primer. The drying temperature and time are adjusted according to the type and performance of the primer. Generally, the drying temperature is between 120°C and 180°C, and the drying time is 15 to 30 minutes.

Top - coat Spraying

After the primer is dried, the bumpers enter the top - coat spraying station for top - coat application. The top - coat is used to provide an aesthetic appearance and good weather resistance. The color and gloss of the top - coat are adjusted according to the design requirements of the automobile. The spraying thickness is generally between 20 and 35 microns. The spraying process of the top - coat is similar to that of the primer, but higher requirements are placed on the spraying uniformity and appearance quality.

Leveling

After the top - coat spraying, leveling is also required to make the top - coat achieve the best flatness and gloss on the surface. The leveling time is generally 5 to 10 minutes, and the leveling environment should be kept clean and well - ventilated.

Drying

The leveled bumpers enter the drying chamber to cure the top - coat. The drying temperature and time are adjusted according to the type and performance of the top - coat. Generally, the drying temperature is between 120°C and 180°C, and the drying time is 15 to 30 minutes.

Post - treatment Process

Cooling

After coming out of the drying chamber, the dried bumpers need to be cooled to room temperature. The cooling method usually adopts air - cooling or water - cooling. The cooling time is adjusted according to the size and material of the bumpers, generally 5 to 10 minutes.

Inspection

The cooled bumpers are subjected to visual inspection and quality testing. The inspection items include coating thickness, adhesion, gloss, color deviation, and surface defects. Professional testing equipment and tools, such as coating thickness gauges, adhesion testers, and gloss meters, are used to test various indicators of the bumpers. Bumpers that do not meet the quality requirements need to be reworked or repaired.

Unloading

The qualified bumpers after inspection are removed from the skids, completing the entire coating process. The removed bumpers should be packaged and labeled for transportation and storage.

The automobile bumper skid coating line process can provide high - quality coatings for automobile bumpers through a series of pre - treatment, spraying, and post - treatment processes, enabling them to have a good appearance, adhesion, and corrosion resistance, meeting the strict requirements of the automotive industry for bumper coatings. At the same time, the skid coating line uses an automated conveying system and spraying equipment, which can improve production efficiency and the stability of coating quality, reducing labor costs and environmental pollution.