Pre-Painted Steel Coil

Pre-Painted Steel Coil

Majestic born on date: April, 2022

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Favorite thing(s) to do outside of the office: Exercising, enjoying great food, and spending time traveling and adventuring with my lovely wife, two crazy boys and our boxer we treat as a human.

What’s your favorite ice-cream flavor? Chocolate & Peanut Butter — tell me I’m wrong!

Favorite Quote? “The chief cause of failure and unhappiness is trading what you want most for what you want right now.” – Zig Ziglar

Typical Breakfast? Quad shot vanilla latte…followed by actual food at some point if I make time.

Best professional advice ever given to you? Too many people spend enormous amounts of time and energy trying to eliminate weaknesses…focus on mastering your strengths and surrounding yourself with people that have towering strengths where you are weaker. Watch the magic happen.

Prepainted Metal

According to EN 13523-0, a prepainted metal (or coil coated metal) is a ‘metal on which a coating material (e.g. paint, film…) has been applied by coil coating’.

When applied onto the metallic substrate, the coating material (in liquid, in paste or powder form) forms a film possessing protective, decorative and/or other specific properties.

In 40 years, the European prepainted metal production has multiplied by 18.

Metal

The choice of metallic substrate is determined by the dimensional, mechanical, and corrosion resistance properties required. The most common metallic substrates that are organically coated are:

• Hot dip galvanized steel (HDG) – consists of a cold reduced steel substrate onto which a layer of zinc is coated via a hot dip process to impart enhanced corrosion properties.
• Galvanized mild steel (GMS) – used as balustrade and handrail of staircase, pipe, etc.
• Other zinc-based alloys – coated onto steel and used as a substrate for coil coating, giving different properties and improved corrosion resistance in particular conditions.
• Electro-galvanized (EG) coated steel – consists of a cold reduced substrate onto which a layer of zinc is coated by an electrolytic process.
• Cold reduced steel (CR) – without any zinc coating.
• Wrought aluminum alloys.
• Other substrates such as zinc/iron, stainless steel, tinplate, brass, zinc, and copper.

Coil Coating

Coil coating is an industrial process for efficiently coating metal coils. The metal is treated before it is cut and formed, providing tightly-bonded finishes. Because of this, coil-coated metal (often called prepainted metal) is more durable and more corrosion-resistant than most post-painted metal.

Annually, 4.5 million tons of coil-coated steel and aluminum are produced and shipped in North America, and 5 million tons in Europe. The growth rate of coil-coated metal has exceeded the growth rates of either steel or aluminum production.

Process

The coil coating process involves cleaning, chemical pre-treatment, and one-side or two-side application of paints or coating powders. The metal substrate (steel or aluminum) arrives in coil form from rolling mills. The coil is unwound, passing through various pre-treatment and coating processes before being recoiled. Accumulators at the beginning and end of the line enable continuous work.

The Coil Coating Line

The continuous process involves applying up to three separate coating layers onto one or both sides of a metal strip substrate. Coil-coating lines vary in size and speed, but they all share the same basic process steps.

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• Mechanical stitching of the strip to its predecessor
• Cleaning the strip
• Power brushing
• Surface treatment by chemical conversion
• Drying the strip
• Application of primer on one or both sides
• First curing oven (15 to 60 seconds)
• Cooling the strip
• Coating the finish on one or both sides
• Second curing oven (15 to 60 seconds)
• Cooling down to room temperature
• Rewinding of the coated coil

Coatings

Available coatings include polyesters, plastisols, polyurethanes, PVDF, epoxies, primers, backing coats and laminate films. Primer coatings form the essential link between the pretreatment and the finish coat, providing inter-coat adhesion and promoting corrosion resistance. Backing coats are applied to the underside of the strip with or without a primer.

Applications

Prepainted metal is used in various products and industries:

• Construction industry for indoor and outdoor applications
• Automotive and transport industries
• Production of white goods like washing machines
• Cabinets for electronic goods
• Office furniture
• Lighting envelopes
• Bakeware

It is increasingly chosen for its quality, low cost, design flexibility, and environmental benefits. Using prepainted metal can contribute to LEED certification for sustainable design. A wide array of color options are available, making it flexible for unique, expressive designs.

The output of the coil coating industry is a prepainted metal strip, which finds applications across multiple industries. Some high-tech, complex coatings for cool metal roofing, smog-eating building panels, antimicrobial products, and more are applied using the coil coating process, making them more cost-effective.

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