Coated sheets, also known as organic coated sheets or pre-painted steel coils, are made by applying or lamination various organic coatings or plastic films to the surface of metal coils (cold-rolled steel, galvanized steel, aluminum-coated steel, high-aluminum alloy steel, stainless steel, etc.). As these coils are coated at the metallurgical plant, they are ready for direct processing into products by the user, hence also referred to as pre-painted coils.
Coated steel sheets combine the benefits of both organic polymers and steel plates, offering the excellent coloring, molding, corrosion resistance, and decorative properties of organic polymers, along with the high strength and ease of processing of steel plates, allowing for easy stamping, bending, deep drawing, and welding. This results in products made from organic coated steel sheets that possess superior practicality, aesthetics, workability, and durability. There are numerous types of coated steel sheets, exceeding 600 in total, yet there is no unified classification method due to the difficulty in finding a distinguishing standard among the various types. Additionally, each manufacturer has its unique equipment and processes, leading to a wide variety of product types. Classification is currently done according to general conventions.
1. Categorized by the base material, commonly used base materials for organic coated steel plates include cold rolled steel, hot-dipped galvanized steel, electro-galvanized steel, alloy steel, zinc-aluminum plated steel, electro-galvanized alloy steel, tin-plated steel, chrome-plated steel, and aluminum plates, etc.
2. Organic coated steel sheets are categorized by processing techniques, which include roller coating, spray coating, powder coating, lamination, and printing methods. They can be further classified based on the number of coatings and baking processes, such as one-coat-one-bake, two-coat-two-bake, three-coat-three-bake, and four-coat-four-bake. Additionally, they can be subdivided into wood grain, marble, leather grain, and cement砂浆 patterns according to embossing or printing processes.
3. Categorized by paint type, typically classified by paints used for organic coatings, including polyvinyl chloride coated steel plates, polyester coated steel plates, silicone polyester coated steel plates, etc.
4. Categorized by coating performance, including high weather-resistant coating panels, high-temperature-resistant coating panels, self-extinguishing coating panels, sterilization coating panels, non-stick snow coating panels, anti-fingerprint coating panels, and self-lubricating coating panels, among others.
5. Categorized by special coatings and applications, including epoxy zinc-rich coatings, organic coated steel plates based on cold-rolled steel sheets, velvet-coated steel plates, and some special machine-coated sandwich plates such as wood film panels, core panels, and vibration-resistant panels.
