Color-coated coils are light, beautiful and have good anti-corrosion properties, and can be directly processed. The colors are generally divided into gray-white, sea blue and brick red. They are mainly used in advertising, construction, household appliances, electrical appliances, furniture and transportation. Industry. The paint used in the color-coated coil selects the appropriate resin according to the use environment, such as polyester silicon modified polyester, polyvinyl chloride plastisol, polyvinylidene chloride, etc. Users can choose according to the purpose. On the continuous line, cold-rolled strip steel and galvanized strip steel (electro-galvanized and hot-dip galvanized) are used as substrates, which undergo surface pretreatment (degreasing and chemical treatment) and are coated with rollers.
One or more layers of liquid paint are applied, and the sheet obtained by baking and cooling is called a coated steel sheet. Since the coating can have various colors, it is customary to call the coated steel sheet color coated steel sheet. And because the coating is carried out before the steel plate is formed, it is called a pre-coated steel plate in foreign countries.
Color-coated steel sheets are made of cold-rolled steel sheets and galvanized steel sheets as substrates, after surface pretreatment (degreasing, cleaning, chemical conversion treatment), continuous coating (roller coating), and baking and cooling. finished product. The main production process of the common two-coating and two-bake continuous color coating unit is: uncoiling→pretreatment→coating→baking→post-treatment→coiling.
