Color coated plate, the industry also known as color steel plate, color plate.Color coated steel plate is made of cold rolled steel plate and galvanized steel plate as the base plate, after surface pretreatment (degreasing, cleaning, chemical conversion treatment), coating in a continuous way (roller coating method), baking and cooling products.Coated steel plate has light weight, beautiful appearance and good anti-corrosion performance, and can be processed directly. It provides a new raw material for construction industry, shipbuilding industry, vehicle manufacturing industry, home appliance industry, electrical industry and so on. It has played a good effect of replacing wood with steel, efficient construction, energy saving and pollution prevention.
1,Introduction to the prepainted galvanized corrugated steel sheet：
Color coated plate basic concept: in the continuous unit with cold rolled strip steel, galvanized strip steel (electric galvanized and hot galvanized) as the substrate, after surface pretreatment (degreasing and chemical treatment), with the method of roller coating, coated with a layer or multiple layers of liquid paint, after baking and cooling the sheet is coated steel plate.There are back (bottom) paint and surface (front) paint coating, the general domestic is a layer of back paint, two layers of top paint, foreign business top paint back paint are two layers.Because the coating can have a variety of different colors, it is customary to call the coated steel plate color coated steel plate.
Common continuous color coating line for two with two type drying process main production process is: decoiler — – — – — – — stitching machine — – — – — – press roll — – — – — – – tension machine uncoiling looping soda-wash degreasing — – — – — – — – — – — – drying cleaning — – — – — – — passivation — – — – — – – at the beginning of drying — – — – — – touched — – — – — – — the early drying — – — – — – finish fine tu — – — – — – finish drying — – — – — – — – — – — – air cooling winding loop – winding machine — – — – — (volume packaging warehousing).
A:Cold-rolled substrate color coated steel plate
Colored plate produced by cold rolled substrate, with smooth and beautiful appearance, and has the processing performance of cold rolled plate;However, any small scratches on the surface coating will expose the cold-rolled substrate to the air, which will quickly produce red rust on the exposed iron.Therefore, this type of product can only be used for temporary isolation measures and indoor materials with low requirements.
B:Hot dip galvanized color coated steel plate:
The organic coating coating on the hot dip galvanized steel plate is hot dip galvanized color coating plate.In addition to the protective effect of zinc, the organic coating on the surface also plays the role of isolation protection and prevention of rust, and its service life is longer than that of hot galvanized sheet.The zinc content of hot galvanized substrate is generally 180g/m2(double-sided), and the zinc content of hot galvanized substrate for exterior building is the highest 275g/m2.
C：Hot coated aluminum-zinc color coating plate
Hot aluminized zinc steel plate (55%-Ai-Zn and 5%-Ai-Zn) can also be used as color coated substrate upon request.
D:Galvanized color coated plate
Electric galvanized sheet as the substrate, coated with organic coating baking products for galvanized color coating, because the zinc layer of galvanized sheet is thin, usually contain zinc of 20/20g/m2, because this product is not suitable for use in the outdoor production of walls, roofs, etc.But because of its beautiful appearance and excellent processing performance, it can be mainly used for home appliances, audio, steel appliances, interior decoration and so on.
Use galvanized steel plate for the color coating layer of the base plate, in addition to zinc protection, the organic coating on the zinc layer played the role of covering isolation, can prevent steel plate rust, service life is longer than galvanized steel plate, according to the introduction of the service life of coated steel plate is longer than galvanized steel plate 50%.However, in different areas and different use parts, the use of the same galvanized quantity, the same coating, the same coating thickness of the color coating plate, its service life will be very different.For example, in industrial areas or coastal areas, corrosion speeds up and service life is affected by sulfur dioxide gas or salt in the air.In the rainy season, the coating is soaked by rain for a long time, or in the temperature difference between day and night is too large and easy to condensation parts, will be corroded faster, and the service life will be reduced.Buildings or factories made of colored coated steel plates often have a longer service life when they are washed by rain,
otherwise, they will be affected by the effects of sulfur dioxide gas, salt and dust.Therefore, in the design, if the slope of the roof is greater, it is not easy to accumulate dirt and other dirt, the longer the service life;For those areas or parts that are not normally washed by rainwater, they should be washed regularly with water.
Appliances :31% Construction :63% Others :6%
Color steel plate is widely used.With no pollution, excellent weather resistance, corrosion resistance, high processing and other characteristics.Color steel plate is widely used in construction, home appliances, transportation, packaging, mechanical processing, interior decoration, medical treatment, automobile industry, etc.
5,The development trend
First, the use of high quality substrate, substrate surface, shape and dimensional accuracy requirements are more and more high, outdoor such as small zinc flower flat hot dip galvanized steel coil, no zinc flower flat hot dip galvanized steel coil under the rise of zinc alloy hot plating coil;For indoor use, such as electric galvanized steel coil, coated cold rolled sheet and aluminum coil.
Second, improve the pretreatment process and pretreatment liquid, the number of equipment is small, low cost has become the mainstream process, and constantly improve the stability, corrosion resistance and environmental performance of the pretreatment liquid.
Third, pay attention to the development of new coatings, general polyester, polyvinylidene fluoride (PVDF) and plastic sol improvement, obtain super color reproductivity, anti-ultraviolet, anti-sulfur dioxide, improve corrosion resistance;Develop functional coatings that are resistant to pollution and heat absorption.
Fourth, the unit equipment is more perfect.Such as the use of new welding machine, new roller coating machine, improve the curing furnace, the configuration of advanced automation instruments.
Fifth, because the cold embossed flower is cheaper than the hot embossed flower, it has the characteristics of beauty, three-dimensional sense and high strength, so that the cold embossed flower production technology has become a development trend.
Sixth, pay attention to the diversification of the product, function, high grade, such as deep color coating board, “grapefruit skin” color coating board, anti-static color coating board, pollution resistant color coating board, high heat absorption color coating board.
A, no pollution, economy
The production process of color coated steel plate is less harmful to the environment, and can be recycled, greatly reducing the pollution to the environment, and light weight, can save the bearing structure materials, reduce the cost.
B, convenient processing, convenient construction
Color coated plate can be rolled into various shapes and lengths according to the needs of the profiled steel plate, the middle is generally no lap, simple construction, waterproof effect is good.