Color steel coil is a composite material, also known as color coated steel plate, which is made by coating chemical coatings on the production line continuously after surface degreasing and phosphating, and then coating with organic paint.
Color coated steel coil is a kind of composite material, both with steel plate and organic material. It has the mechanical strength and easy forming properties of the steel plate, and also has the good decorative and corrosion resistance of organic materials.
1. Although the current consumption of the largest building materials with hot galvanizing substrate is very large, there is a lack of good basic plate such as zinc plated steel coil and zinc alloy plating steel coil.
2. The varieties and quality of the domestic paint can not fully meet the needs, and the high price of the imported coatings has reduced the competitiveness. Plastic film needs to be imported, lack of thick, functional, high - strength, colorful and advanced coating.
3. The product is not standardized, resulting in serious waste of resources. There are too many low energy generating units with capacity below 40 thousand tons per year, and still having problems in product quality and environmental resources protection.
4. The number of new color coating units in China is too much, which is far beyond the demand of the market, so that many color coating units have low operating rate and even shut down.
First, the use of high quality substrates requires higher requirements for the surface, shape and dimensional accuracy of the substrates. Outdoor hot zinc coated steel rolls, zinc free hot rolled galvanized steel rolls and zinc hot rolled galvanized steel sheets are available. Indoor use such as galvanized steel coil, film cold-rolled plate and aluminum roll.
Second, improving the pretreatment technology and pretreatment liquid. The amount of equipment and the cost are low, becoming the mainstream technology, constantly improving the stability, corrosion resistance and environmental protection performance of the pretreatment fluid.
Third, we should improve the general polyester, polyvinylidene fluoride (PVDF) and plastic sol through the development of repaint, achieving super color reproducibility, anti UV, sulfur dioxide and corrosion resistance. Functional coatings, such as pollution resistant and endothermic, are developed.
Fourth, the unit equipment is more perfect. For example, a new type of welding machine, a new roll coating machine, a perfect curing furnace and an advanced automatic instrument are used.
Fifth, because of the low cost of the cold embossing, it has the characteristics of beautiful, stereoscopic and high strength, which makes the production technology of cold embossing become the trend of development.