Detailed explanation of the processing process of color-coated aluminum coils

      Color-coated aluminum coils are produced and processed using the roller coating process. The roller coating process is the most effective method of applying organic protective coatings. It is a continuous, highly automated process that produces a more consistent product than post-coating methods. The aluminum substrate undergoes a degreasing, chemical pre-treatment and coating process. A typical coating line system requires products to have formability, scratch resistance, beautiful appearance, good weather resistance, paintability, etc.

1.Feeding: Raw aluminum coils are sent to the production line and are flattened by a flattening machine. This step ensures that the product has excellent flatness. The aluminum coils enter the storage rack. There are two reels here, ensuring that one is always ready for use. When the aluminum coil is about to complete processing, it must stop so that the roof can be sewn or welded to the head of another coil to maintain the continuity of the production line. Then, the storage rack is emptied and the production line continues to operate, driving the subsequent procedures.

2.Cleaning and pre-treatment: The pre-treatment of aluminum coils is repeatedly cleaned by water spray. This method is more effective than traditional methods. The water field can be reused and energy consumption is reduced.

The pretreatment stage is necessary to improve the anti-corrosion properties of the product and improve the adhesion of the coating. At this stage, the conversion film is chemically formed on the aluminum surface, and the most effective process technology is used to improve product quality and reduce resource waste. The current pretreatment is chromium treatment to improve the bonding ability of the paint coating and the aluminum plate. The subsequent oil and gas will not fall off due to high temperature and heat, and can withstand the erosion of harsh environments.

3.Coil coating: The coating process is mainly divided into two stages, called primer and topcoat. In the first stage, the aluminum coil passes through a roller coater and is coated with primer on one or both sides. After drying, the aluminum coil passes through a second roller coater. At this time, one or both sides of the aluminum coil are covered with topcoat. There are basically two painting methods. Typical coating systems require products to have formability, scratch resistance, beautiful appearance, good weather resistance, and paintability. To achieve these different effect properties, coatings include: internal acrylic resin primer, polyester, polyurethane or fluorocarbon.

4.Curing: The aluminum strip passes through the curing oven, and the temperature is set at an adjusted temperature to ensure that the volatile matter on the aluminum strip is removed and the paint is completely cured. According to the needs of the coating system, the curing temperature is set between 200 and 300 degrees Celsius. time, this is the key technical point to ensure the quality of our products. In addition, in order to protect the environment and control costs, the light mist is evaporated at high temperature and used to heat the curing oven.

5.Subsequent processing: The coated aluminum coils can be further processed into other shapes: roller shutters, striping or embossed patterns, etc.

6.Quality control: The quality inspector will confirm the thickness of the coating and whether there are any leakage problems in the coating.

7.Protective film fit: The protective film of the product is customized according to customer needs, and the protective film of the coated aluminum coil is attached with traditional additional information, such as coating and brand details. These protective films have no impact on the environment and are easy to recycle. It should be noted that the viscosity and thickness of the protective film are relatively strict for color-coated aluminum coils. Try to use a protective film with a thickness of 5-7 wires. The viscosity should not be too high to avoid difficulty in subsequent removal.