Color Coated Aluminum Coil Processing Process Detailed

Color coated aluminum rolls are manufactured by roll coating process, which is the most effective method of coating organic protective coating. It is a continuous, highly automated process that produces a more consistent product than the post-coating method. The aluminum substrate is degreased, chemically pretreated and coated. Typical coating line system requires products with formability, scratch resistance, beautiful appearance, good weather resistance, coating ability, etc.
Feeding: The raw aluminum coil is sent to the production line and smoothed by the flattener. This step ensures excellent flatness of the product. The aluminum coil goes into the storage rack. There are two scrolls, which are used to ensure that one is always available. When the coil is finishing processing, it must be stopped so that the tail can be sewn or welded to the head of the other coil, maintaining the continuity of the production line. Then, the storage rack is emptied, and the production line continues to run, driving the subsequent procedures.
Cleaning and pretreatment: The pretreatment of the aluminum coil is repeatedly cleaned by water spray. This method is more effective than the traditional method, Mizuno can be reused, reducing energy consumption.
The pretreatment stage is necessary to improve the corrosion resistance 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 adopted to improve product quality and reduce resource waste. Now the pretreatment is chrome treatment, improve the combination of paint coating and aluminum plate, the subsequent oil and gas will not fall off because of high temperature and heat; Withstand the erosion of harsh environment.
Coil coating: The coating process is mainly divided into two stages, respectively called bottom coating and surface coating. In the first stage, the aluminium coil is passed through a roll coating machine and either one or both sides are coated with primer. After drying, the aluminum roll passes through a second roller coating machine, where one or both sides of the aluminum roll are coated with paint. There are basically two methods of painting. Typical coating system requires products with formability, scratch resistance, beautiful appearance, good weather resistance, coating ability, etc. To achieve these different effect characteristics, paints include: acrylic resin primer, polyester, polyimide or fluorocarbon.
Curing: The aluminum strip passes through a curing furnace and the temperature is set at an adjusted temperature to ensure that volatiles are removed from the aluminum strip and the paint is fully cured. According to the needs of the coating system, the curing temperature is set between 200 and 300 degrees Celsius, which is the key technical point to ensure the quality of our products. In addition, to protect the environment and control costs, the solvent mist is evaporated at high temperatures to heat the curing furnace.
Follow-up processing: the coated aluminum coil can be further processed into other shapes: roll gate, strip or pressure pattern, etc.
Quality control: By the quality control personnel to confirm the thickness of coating, coating leakage problem.
Protective film fitting: The protective film of the product is customized according to customer requirements. The protective film of the coated aluminum roll is accompanied by traditional additional information, such as paint and brand details. These membranes have no impact on the environment and are easy to recycle. It should be noted that the viscosity and thickness of the protective film is relatively strict in color coated aluminum coil, try to use 5-7 wire thickness of the protective film, the viscosity can not be too high, to avoid the subsequent bad removal.