Category: prepainted galvanized steel coil


First, believe we are in when buying hot sale prepainted galvanized steel coil hope to be able to buy the color besmear board with eligible quality, but as the ceaseless increase of this kind of product on the market, also appeared a lot of inferior quality, increased the difficulty that the user is in roll of color besmear of choose and buy so, before we are buying, how to go judging the quality of color prepainted coil?

Second, first of all, we all know that belt is made up of substrate and coating or color peritoneal, and some of the volume production belt manufacturers often on the substrate and coating checkers, they fell by the thickness of the baseboard, but increase the thickness of the peritoneal to the cost of production volume decline belt, this greatly decreased by the service life of the product.

Third, the second can be through the investigation of China color-coated corrugated roofing sheet leakage edge, the first investigation color coating volume exposed coating (such as cut surface) whether crystallization fine, gray, dark and have no impurities, if the cut surface is crystallization fine type is superior quality, you can rest assured to buy.

Fourthly, it is better to choose a large production company when choosing the color coating roll, so as to ensure that the quality of products can be guaranteed, and the product service will be more considerate than other small companies.

Fifth, constant ze is a professional production color-coated corrugated roofing sheet, color coating roll, color steel plate, color steel coil of large manufacturers, quality assurance, after-sales worry, welcome new and old users to come to the free consultation.

Production Process of Galvanized Coil


By Alisajpq, 2019-05-09

The following describes the main production process of galvanized sheet
1. Unwinding and welding
The prepainted galvanized steel coil in stock is unwound, and the steel coil required for continuous operation is provided. The winding end of the preceding coil and the coil of the subsequent coil are welded to ensure continuous production of the unit.
2. Skim cleaning
The cleaning section is to clean the surface of the galvanized steel coil to remove rolling oil and iron powder to obtain good coating adhesion and surface quality, generally including spraying, brushing, electrolytic cleaning, brushing, spraying, squeezing and hot air drying. Such equipment, cleaning section is more important for hot-dip galvanizing is an important step to obtain the good surface quality of coiled steel.
3. Annealing
The re-crystallization annealing of the rolled coil steel is carried out to obtain good mechanical properties of the product. By controlling the atmosphere in the furnace to obtain good properties of the coil coating, the annealing furnace is generally preheated, heated, soaked, cooled, etc. Segment composition.
4. Air knife zinc layer control
The thickness of the coating on the surface of the hot sale galvanized steel coil is controlled by blowing a gas, typically air or pure nitrogen, onto the surface of the coil after the zinc pot.
5. Alloying treatment
The alloying treatment is a process of heating the pre-painted galvanized steel coil to obtain a zinc-iron alloy coating layer.
6. Leveling and pulling the correction
Rolling steel with small rolling force, eliminating the yield platform of low carbon steel, improving the performance of coil steel, obtaining the desired surface roughness of galvanized steel coil, improving the shape of coiled steel sheet, and obtaining good flatness. After the flattening is the tension correction, the tension correction is the stretching and straightening of the galvanized steel coil, the most important is to obtain a good plate type.
7. Post processing
Passivation or other chemical surface treatment of the prepainted galvanized steel coil in stock to obtain the corrosion resistance, lubrication or other requirements desired by the user, generally by spray squeezing or roller coating drying.
8. Trimming
Cut the coil as needed to obtain the proper width accuracy.
9. Oiling
Oiling the pre-painted galvanized steel coil to obtain certain rust and lubrication properties.

Color steel coil maintenance


By Alisajpq, 2019-04-30

Maintenance during service can extend the life of high quality prepainted galvanized steel coil. Although factory prepainted building rolls last many years longer than normally painted rolls, they still need to be thoroughly cleaned, where there is no need for maintenance where there is automatic rain cleaning, such as roof rolls. Cleaning can remove the accumulated corrosive materials and maintain the beautiful appearance of the building without painting. The places to be cleaned include the bracket, the drip underside roll, the warehouse door roll, the drip roll, and the back groove.

1. Cleaning the color coated rolls:
Typically, clean water is used to remove most of the dust and residue from the surface area of ​​the high quality PPGI prepainted galvanized steel coil. In theory, it needs to be cleaned at least every six months. In places with more salt spray and heavy industrial dust, cleaning should be more frequent. For stubborn stains that cannot be washed out, use a weak detergent or a household ammonia solution as follows. In any case, scrub an inconspicuous patch test before cleaning in large areas. Take a spoonful of detergent (or other detergent, phosphate content less than 0.5%) in 5 gallons of hot water; or take a cup of household ammonia dissolved in 5 gallons of room temperature water, do not mix ammonia with any bleach; do not The detergent and bleach are mixed admixed, and bleaching detergents are used in washing and bleaching are required. Use any of the above detergents to clean the surface of the coil from top to bottom with a soft cloth, sponge, soft brush or low-pressure spray head to avoid wiping streaks and avoiding bright spots. Decontamination powders or industrial detergents are not recommended as they will damage the paint. Water-soluble detergents are very effective. If fungi and mildew are present, the above methods cannot be removed. It is recommended to use bleach-containing detergents such as "Tide" containing bleach. The surface of the washed steel coil needs to completely remove the detergent residue.

2. Repaint the color coated rolls:
If the color coated roll is scratched during installation and use, it may be necessary to repaint the defective part. Improper or excessively applied paint can damage the entire surface. It is best not to fix the scratches that appear inconspicuous at 6 feet because normal wind erosion can cover them. To repair the paint, only the part of the paint is repaired. Before the touch-up, the parts that need to be repaired need to use alcohol to remove dirt, paraffin, and other contamination. It is recommended not to use a spray paint to repair a large area because the spray paint is not as dry as China prepainted galvanized steel coil factory. Get the right spray system with the construction roll manufacturer or coating supplier. It is not recommended to use aerosol or spray to repair scratches. The best repair tool is a high quality, 1/2 inch or slightly smaller painting brush. If the maintenance is carried out as described above, the color coated roll will retain its original color for a long time.

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