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How to Storage Pre-painted Coils?

Pre-painted coils use cold-rolled strip steel, galvanized strip steel (electric galvanized and hot dip galvanized) as the substrate, after surface pretreatment (degreasing and chemical treatment), with the method of roll coating, coated with one or more layers of organic coating, after baking and cooling of the plate. It is mainly used in construction (outdoor) workshops, agricultural warehouses, residential prefabricated components, corrugated roofs, household appliances, etc.

Pre-painted Coils

Pre-painted Coils

Pre-painted Coils Production Process

The main production processes of the common two-coating and two-drying continuous color coating unit are as follows: Uncoiler, stitching machine, roller, tension machine, open-book looping, alkaline degreasing, cleaning, drying, passivation, at the beginning of drying, primary coat, paint drying, paint finishing coating, paint drying, air cooling, winding loop, winding machine, (volume packaging warehousing). The video of the production process of pre-painted coils is for your reference:

Color Coated Coils Applications

Pre-painted coils have light weight, beautiful appearance, and good corrosion resistance, and can be directly processed, mainly used in advertising, construction, home appliances, electrical appliances, furniture, and transportation industries.

1. In the construction industry, roofs, roof structures, rolling shutter doors, kiosks, shutters, guard doors, street waiting rooms, ventilation channels, etc.;

2. Furniture industry, refrigerators, air conditioners, electronic stoves, washing machine shells, oil furnaces, etc.;

3. Transportation industry, car ceiling, backplane, coaming, car shell, tractor, ship compartment board, etc. Among these uses, are the use of more steel structure plants, composite plate plants, and color steel tile factories.

Pre-painted Coils Features

1. Durability, corrosion resistance, and galvanized steel plate compared with longer service life.

2. Heat resistance, compared with galvanized steel sheets, is not so simple to fade at high temperatures.

3. Thermal reflectivity, for sunlight irradiation has a certain reflection performance.

4. Pre-painted coils have similar processing and spraying performance with galvanized steel sheets.

5. With excellent welding performance.

6. Pre-painted coils have excellent performance and price ratio, durable performance, and reasonable price reservation, which is a rare roll on the market.

RAL9002 Coil

RAL9002 Coil

Coils are Coating

Coils are Coating

Advice for Pre-painted Coils Storage

Many people think that color steel coil storage is very simple, and do not need to pay attention to what problems, in fact, not. If you do not pay attention to storage, it will cause damage to the color plate, resulting in casualties, very serious. The storage of color steel coil is an important link to ensure the quality of the color spraying plate, due to improper operation, there will be scratches, indentation, corrosion, and other defects in the storage process, to minimize the production of these defects, the following gives some points for attention when storage.

1. If you do not use the color-coated coil for a long time, people should do a good job of storage work, if the storage will cause damage, the color-coated coil should be stored in a clean natural environment to prevent corrosion of various corrosive media. Color rolls should be stored in dry, naturally ventilated indoor air, to prevent outdoor storage or storage in the prone to condensate and temperature changes. The road surface of the storage site should be smooth, free of hard blocks, and have sufficient load capacity. The vertical steel coil should be placed on the eraser pad, wood pad, and fixing bracket, and the buckle should face upward. To avoid crowding injury, generally do not carry out palletizing storage, storage strictly limits palletizing height.

2. The physical properties of the color coating volume and some coating characteristics, such as pencil hardness, T-bend value, and impact power, will change greatly with the increase of storage time, so it is recommended that users as early as possible production processing application. Storage and transportation site should have enough indoor space for elevator equipment. The storage parts of thick plate and coil steel are effectively distributed for easy access to minimize excessive movement.

Packaged Color Coated Coils

Packaged Color Coated Coils

Pre-painted Coils In the Warehouse

Pre-painted Coils In the Warehouse


Improper storage of color coating rolls will affect the quality of color coating rolls. Due to improper operation, color coating rolls may be scratched, embossed, corrosion, and other adverse defects. To avoid or reduce defects as far as possible, you can take the storage suggestions mentioned in our article.

We are Wanzhi Steel Group, a leading manufacturer and distributor of pre-painted coils(PPGL and PPGI coils). Pre-painted coils have been our company’s best-selling products, have been sold to more than 100 countries and regions in the world, and have been praised by customers. In the aspect of color coating, Wanzhi Steel has two professional color coating production lines, with an annual output of 320000 tons. We offer all RAL colors to our clients. Of course, you can also customize the color and pattern of the pre-painted coils. We do our best to meet our client’s requirements. If you are interested in our pre-painted coils, please feel free to contact me, and you are welcome to visit our factory.










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