Prepainted Steel Coil

A: There are specific qualities of pre-painted & coated steel that make it particularly appealing to customers. It is cheaper to paint by the foot rather than by the part. Additionally, many parts are too big to be painted after they are made.

A: Pre-painted steel coil, also known as pre-coated steel coil or color-coated steel coil, is a product made of hot-dip galvanized steel sheet, hot-dip galvalume steel sheet, electro-galvanized steel sheet, etc. that has been coated with one or more layers of organic paint or other protective coatings.

A: Pre-painted steel coils can last for several years because the paint offers an extra layer of protection to the steel. Paints contain corrosion-inhibiting agents that can thwart moisture, heat, oxygen, and corrosion-inducing agents from causing damage to the steel.

A: Here are steps at the coating line:
Step 1: Cleaning the Metal Strip
Cleaning up the oil, dirt, and impurities of the cold-rolled coil involves brushing, an alkaline dip, a water bath, or brushing.
Step 2: Application of Zinc and Alloy
The application of aluminum and zinc depends on the application and customer requirements. Some products consist of 100 percent zinc, while others contain magnesium alloy.
Step 3: Treatment of the Surface
This step is vital to ensuring that the paint and primer bond well with the metal strip. Due to some chemical restrictions, the surface is treated with chemicals, such as alkaline oxidation, depending on the supplier and country of origin.
Step 4: Metal Rinsing and Drying
Rinsing the metal strip helps ensure that it has no chemical residue before applying primer. Drying the metal is a must to ensure that the subsequent layers bond well.
Step 5: Application of Primer
A coating of primer can be on one or both sides of the metal strip. Primer application hastens the adhesion of the finished paint layer.
Step 6: Curing and Cooling the Strip
Curing takes 15 to 16 seconds. This method allows the primer to harden, dry, and reach the desired temperature before applying the next coating.
Step 7: Front and Back Coating
This step is the final painting stage, wherein two-coat paint systems are applied.
Step 8: Drying, Curing, and Cooling
The product undergoes this step to ensure that the steel product is ready for rewinding, rerolling, and shipping to end users.

A: The Cold Rolled Steel Substrate (Layer 05)
The steel has already undergone significant processing to get to this stage. Typically originating from a Blast Furnace & BOC process, the slabs are hot rolled to create thin steel coil and then cold rolled to create steel sheet at the desired thickness/ gauge. The cold rolling process creates a thinner material and is used to refine the properties of the finished product.
The properties of this layer will depend on the final application.
Zinc Alloy (Layers 04 & 06)
This layer is critical in providing protection to the steel and can provide excellent corrosion resistance even on the cut edges. It can be 100% Zinc but is often made up of Zinc & Aluminium and the exact proportion of each is unique depending on the supplier and the product.
Surface Treatment
The coil undergoes a surface treatment, on the front and back, before being presented to the next painting process to ensure that the next layer can be adequately bonded to the zinc layer.
Primer (Layer 03)
Primer is typically only added to the top of the steel as it ensures a strong adhesion with the top layer of paint. It may also be added to the bottom layer depending on the environment the finished product will be in and type of base coat being added.
Backing Coat (Layer 07)
The thickness, appearance and qualities of the backing coat is entirely dependent on the end use of the product.
In some cases the base/reverse side of the steel sheet will be visible to the end consumer in which case the material needs to meet aesthetic standards as well as meeting corrosion and fire standards, for example in some agricultural buildings.
In other cases the base of the steel is covered by another product, for example to create a composite panel, and so the function of the material is extremely relevant but the aesthetics are not so. Here the backing coat would need to provide long term protection to the steel, protect it from corrosion & mechanical damage during the panel creation process and provide excellent adhesion for the panel core.
Painted Top Coat (Layer 02)
For pre painted steel this is the layer that the end user will see and the key aesthetics come from a combination of the colour & design; the emboss style & depth (or whether to emboss at all); the gloss level.
The type and depth of emboss used depends on the supplier and offers a unique texture to the product. The depth of the emboss can be from 50microns but some emboss designs could trap dirt so the environment the finished product will be in must be considered when choosing an emboss type and depth.
Gloss levels are measured in GU and start from matt all the way to high gloss.
There are a multitude of different styles and colours available with most producers being able to colour match or create bespoke appearances for a large project.
Of vital importance to the end customer is the durability of this layer as the aesthetics of the material is as important in 20 years time as it is now. The requirements depend on the environment the material is in but typically end consumers look for: corrosion resistance (measured as RC); salt spray & humidity resistance; UV resistance (measured as RUV); abrasion resistance (wind, rain, sand); soil & pollutants resistance; flexibility of material; operating temperature; fire performance.
Clear Protective Coat (Layer 01)
Many products do not have a top coat as the majority of products are 2 layers (primer and topcoat) but this extra layer can add an additional layer of protection that increases UV protection, and therefore reduces the likelihood of colour fade, and scratch resistance. It is a clear layer so does not dilute or affect the colour underneath.

A: Prepainted galvalume steel coilis made of hot-dip galvalume sheet, hot-dip aluminum zinc plate, electro-galvalume sheet, after surface pretreatment (chemical degreasing and chemical conversion treatment). Prepainted galvalume steel coil is coated with layers of organic paint, and then baked, through the curing process. This steel plate has bright appearance, which has good performance of a variety of materials.
Prepainted galvanized steel coils not only greatly improve the chemical stability of the material, but also have more effective anti-rust and anti-corrosion properties. The extensive applications of prepainted galvalume steel coil also depends on its good performance, high quality prepainted galvalume steel coil is coated with high strength steel materials, and easy to shape.
It is worth to mention that all the raw materials used in the production of prepainted galvanized steel coils are environmentally friendly materials, whether it is the production or later use, it has a very high environmental characteristics.
Prepainted galvalume steel coil has features such as light weight, good corrosion resistance. It can be processed directly. In general, we can see color gray, navy, red brick in market. Prepainted galvanized steel coil can be widely used in the advertising industry, construction, household appliances industry, electrical industry, furniture industry and transport industry.

A: Matt PPGI
The matt PPGI Coil includes large and small wrinkled PPGI. The thickness of the paint coating is 20μm-45μm, which is not easy to colorize for roofing sheets with longer life.
Steel Sheet in Coil Prepainted with Brick Designs
The pattern of bricks is printed on a sheet of galvanized steel.
Application: Inner walls, outer decorations.
Coated Coil with Marble Color
A galvanized sheet is printed with the marble pattern.
Application: Inside and outside walls
Steel Coil with Camouflage Color
Printing patterns of camouflage on galvanized sheets or Aluzinc sheets.
Application: Inside and outside walls
Prepainted Steel Coil with Wooden Design
On galvanized or Aluzinc sheets, print patterns of wood grain designs.
Applications: Garage and house doors

A: Prepainted steel coils are treated with a robust coating that provides resistance against corrosion, UV rays, and harsh weather conditions. Suitable for a wide range of applications, including roofing, wall cladding, appliances, automotive parts, and more.
Choose from an array of colors and finishes to match your project's design and aesthetics. Prepainted steel coils are easy to handle and install, reducing labor costs and project timelines.
The galvanized steel base ensures longevity and structural integrity, making it a cost-effective choice for your projects.
Tailor the appearance of your project with a broad spectrum of color options and finishes, ensuring your vision comes to life.
Our prepainted steel coils are environmentally friendly, thanks to their recyclability and low VOC (volatile organic compound) paint finishes.

A: Construction
Perfect for roofing, siding, and architectural elements, providing both beauty and strength to structures.
Manufacturing
Used in the production of appliances, HVAC systems, and countless other products where aesthetics and durability are paramount.
Automotive
Ideal for automotive parts, offering corrosion resistance and a sleek appearance.

A: These coatings prevent rusting or corrosion, making the coil.
The zinc, aluminium, and magnesium coating extends the life of the coils and the sheets.
The combination of all the metals makes it difficult for them to withstand abrasive weather, which makes them superior than wood items.
The item is relatively lightweight and portable.
The items are environmentally friendly and don’t harm the beauty of nature.
increases the metal’s toughness.

A: Advantages in Design
Prepainted steel products are aesthetically appealing due to their design, texture, and color variations. The surface finish comes in printed films that look like woodgrain, matte, high gloss, embossed, orange-peel, or smooth. They are available in various aluminum alloys and grades that are easy to bend and adjust during application.
Manufacturers are producing sustainable and recyclable prepainted steel. This steel has a superior performance against corrosion despite its thinner organic coatings, which are common in post-applied films and powder. The organic coatings are less costly as they do not need regular repainting and maintenance.
Sustainable in Life Span
Prepainted metals undergo a coil coating process that offers long-lasting service without costing much. Since they are organic paint coatings, they are less costly but offer a sustainable, effective, and reliable design solution for various applications.
Manufacturers take close supervision during the coating operations, ensuring that the prepainted metals yield a premium, recyclable, and sustainable design that can last for up to forty years in the harshest environments.

A: Prepainted metals have a high formability, which means they are easy to bend, blank, form, draw, and rewind. Driving mechanical fasteners like rivets, screws, bolts, and Tog-L locks does not require extra force. They are easy to bind using an adhesive bond or lock seam.
They are weldable and formable into different shapes due to their aluminum content. The surface is free of dirt and imperfections as the aluminum and steel undergo cleaning, priming, painting, and curing. They offer superior performance to their post-painted counterparts.
Prepainted Metal and Cut-Edge
Prepainted steel coils boast of their prepainted cut-edge that offers superior performance for several years. The reason is that cut edges are less susceptible to corrosion compared to post-painted metals without exposed edges.

A: COMPARISONS AMONG CONSTRUCTION MATERIALS
As a roofing and walling manufacturer - especially if you produce sandwich panels – pre-painted steel is just right for you. Its versatility, durability, and ease of use make it the perfect choice for creating high-quality, long-lasting panels that your customers will love. And because it's so reliable, you'll save time and money by avoiding constant replacements and repairs.
Compared to Concrete
Pre-painted steel product offers greater flexibility in design and color options, making it an attractive choice for architects and builders looking to create visually striking buildings. Pre-painted steel is also much lighter than bricks (only weighing 1/30 of common bricks), making it easier and faster to install, and it requires less maintenance over time.
Compared to Aluminum
Pre-painted steel is typically less expensive and offers similar or greater strength and durability. It is also more resistant to corrosion and wear than aluminum, making it a good choice for buildings in coastal or industrial areas.
Compared to Traditional Roofing Materials Like Asphalt Shingles or Clay Tiles
Pre-painted steel is It can withstand high winds, heavy rain, and even hail without sustaining significant damage. Additionally, PPGI/PPGL roofing can be made to mimic the look of traditional roofing materials, while offering superior durability and longevity.

A: The construction sector
The construction sector is where colour-coated panels are used the most. The application range of colour coated panels in this industry is rapidly expanding due to the steel structure construction industry’s rapid technological development and the nation’s aggressive promotion of steel structure construction. Its use is expanding quickly on everything from industrial buildings to civil structures, including roofs, walls, balconies, doors, and windows as well as kiosks, phone booths, and other structures. Many high-end ceilings and interior wall panels with embossing and printing have started to be employed in the decoration industry thanks to the advancement of colour-coated board production technology. Architectural colour-coated panels come in a broad variety of styles nowadays, with different types of coatings being applied and varying coating thicknesses.
The sector that produces household appliances
The use of colour-coated plates in the household appliance manufacturing industry is expanding quickly thanks to an increase in the variety of colour-coated plates and improvements in the manufacturing processes. These plates are primarily used in refrigerators, washing machines, microwave ovens, dishwashers, disinfection cabinets, sanitary equipment, etc. Currently, the majority of colour-coated plates used in household appliances are high-gloss, single-color coated plates and film-coated plates.
The Electromechanical
Electronic control device panels, housings, and other instrument housings are among the electromechanical product manufacturing industry’s uses of colour-coated plates. Additionally, office supplies like computers and copiers are rapidly transitioning to using colour-coated plates for their outside shells.