Introduction to the Classification of Color Coated Coils

1. There's a widespread use of color-coated coils, a product that is highly utilized and can be seen in various places. Below, we'll delve into the different classifications of color-coated coils.

2. The pre-painted coil, also known as black steel coil, integrates steel with a rich and vibrant film using advanced composite technology, creating a seamless blend that combines the benefits of multiple materials. This significantly enhances the material's chemical stability and provides more effective rust and corrosion prevention. The pre-painted coil not only boasts superior qualities such as flexibility, malleability, pressure resistance, wear resistance, heat dissipation, and high-temperature resistance but also excels in terms of color, brightness, and texture. It is worth mentioning that all raw materials used in the production of pre-painted coils are environmentally friendly and non-toxic, and the production process is completely dust-free, ensuring high environmental protection standards throughout both production and later use.

3. The彩涂卷 materials are divided into five categories: packaging, appliance, construction material, optical materials, and decorative materials. Among them, the appliance category features the best and most refined coating technology, with the highest consumer demands.

Second, pre-treatment process for color coated steel coils

When designing the color-coated coil line, the three fundamental elements to consider first are quality, product diversity, and high yield. As the demand for color-coated coils increases, the requirements for these elements become more stringent. Many factors can affect the production of the coating unit, such as steel strip pretreatment, coating machines, and curing ovens, but the two most critical factors are the coating machine and the curing oven. The primary purpose of the pretreatment process is to remove oils and impurities from the steel strip surface, and through passivation, form a chemical conversion film on the steel plate surface to enhance the adhesion between the coating and the steel substrate, as well as improve the corrosion resistance of the steel strip. The pretreatment process includes: degreasing, brushing, hot water rinsing, surface adjustment, hot water rinsing, passivation, and drying.

2. Surface adjustment is a surface treatment process added before phosphating or chromating treatments during the production of certain products. It involves a spray rinse treatment of the steel strip surface with a weakly acidic solution containing Ni and F ions. The purpose is to enhance the coating properties and the adhesion of the coating-type passivating agent, as well as to remove substances like Al and Pb that precipitate at the grain boundaries on the galvanized substrate surface. This process is particularly represented by Japan. Passivation typically requires treating the substrate with phosphates or chromates, and the main methods include spray, immersion, and coating types. With increasing demand for film uniformity from users and growing environmental awareness, the coating-type passivation method has gained significant attention. The coating-type passivation employs a rolling coating method to apply the treatment solution to the steel strip surface, forming an isolation film between the metal and the coating. This method allows for easy control of the passivation process and ensures uniform film thickness, with minimal or negligible waste liquid, which is beneficial for environmental protection.

3. There are two designs for the pre-treatment process layout. One involves a pre-washing section before the jacket and a pre-treatment section after the jacket, a design commonly adopted by some European suppliers of coated steel lines, such as Fata. The other design only features a pre-treatment section after the jacket, without a pre-washing section before it, a method used by Asian suppliers of coated steel lines. The first design's advantage is that a pre-degreasing section before the jacket can remove large particle impurities from the incoming material surface, preventing them from entering the jacket and adhering to the roller, which could impact the surface quality of subsequent materials. Its drawback is that it is more resource-intensive and costly. The second design considers that the steel strip surface can be thoroughly cleaned in the pre-treatment section, eliminating the need for a pre-washing section before the jacket, thus reducing operating costs.