Why is Prepainted Steel Coil For Commercial Appliances Better?

Coil coating is one of the most advanced, efficient and environmentally friendly means of coating metal. Using prepainted metal can provide manufacturers with a streamlined manufacturing process, cost savings and a more environmentally friendly plant.

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In the old days of traditional manufacturing, steel and other metals arrived at factories in a raw, untreated, unpainted state. Companies would fabricate and paint or treat the metal components of their product at the plant. This was a costly, time-consuming and environmentally harmful practice. The coil coating process was pioneered in the s for painting, coating and pretreating large coils of metals before they ever arrived at a manufacturing facility. The Venetian blind industry was the first to discover the benefits of prepainted metal.

Today, more than 800 million tons of coil coated steel and aluminum are produced and shipped in North America alone each year. Industry leaders using coil coated metal include GE, Whirlpool, Trane, Mercedes Benz, Nordyne and Steelcase, to name just a few. Thousands of products in dozens of different industries are made more efficiently with prepainted metal.

Major industries include building products such as metal roofs, wall panels and garage doors; office furniture (desks, cubical divider panels, file cabinets and modular cabinets); home appliances (refrigerators, dishwashers, freezers, range hoods and microwave ovens); heating and air-conditioning outer panels and ductwork; commercial appliances; vending machines; foodservice equipment and cooking tins; beverage cans; automotive panels and parts (fuel tanks, body panels and bumpers); and other components. New applications make the switch every year.

The Coil Coating Process

Coil coating is one of the most advanced, efficient and environmentally friendly means of coating metal. Large coils of metal (including cold-rolled steel, hot dip galvanized, electro galvanized, zinc-steel, aluminum, stainless steel, copper and brass) can be coated in a continuous, highly automated process prior to fabrication. During this continuous process, the metal is unwound and then cleaned and chemically treated. Depending on the product specifications, one or both sides may then be primed and/or topcoated, oven cured, and rewound for shipment.

The variety of coatings available is almost unlimited and includes polyesters, polyurethanes, epoxies, vinyls, plastisols, acrylics, waterborne emulsions, zinc-rich coatings, fluorocarbons, dry lubricants, and treatment and primer combinations. Moreover, product quality is continually improving as a result of new industry-specific coatings that are regularly coming to market and advanced testing performed throughout the coil coating process.

Superior Quality Control

The prepainting process is designed to produce highly uniform, impeccable-quality coatings. The coatings are precisely applied with special equipment that provides a high-quality finish. The coatings can be on both sides of the metal and meet the finished product specifications. Manufacturers using prefinished metals will find consistent color, texture, thickness and performance in their finished products.

To ensure the best possible results, numerous quality control tests are performed during the coil coating process. For example, before coating, the metal substrate and the viscosity, color, gloss and physical performance of the paints are tested. As the uncoiled metal is coated, the surface treatment process is tested and adjusted continuously to ensure a high-quality finish. In addition, the paint thickness, curing temperature and production line speed are controlled and measured. Coating performance, including features like gloss, color, hardness, adhesion, and resistance to cracking and marring, are inspected as the coated parts leave the production line. After production, parts are tested for corrosion resistance with salt, chemical sprays and/or water immersion. Additionally, they&#;re examined for heat resistance, accelerated ultraviolet and environmental exposure. Other tests conducted on coil coated parts include stain-resistance, welding capability, and resistance to abrasion.

Prepainted parts can outperform post-painted applications because prepainted metal coils are uniformly cleaned, pretreated and painted as a flat surface. The primer coat also prevents the undercutting of paint and enhances corrosion resistance, the durability of the product and overall quality. Furthermore, the coatings are tightly bonded to the metal and often are applied to both sides of the metal.

Moreover, there is almost an unlimited selection of available prepaint coatings. These coatings are available in various degrees of gloss, color, textures, lubricity, flexibility and combinations thereof. Various primers can be selected to help create an industry-specific coating system that maximizes the performance of the product for special end-use applications.

Case in Point

For a manufacturer using painted steel, aluminum or other metals in the manufacturing process, the process of coil coating can dramatically improve productivity, reduce processing costs, improve quality, and reduce inventory and environmental/emission concerns, all at the same time. Just ask Trane, Inc., a manufacturer of commercial air handlers. Quality has always been a top priority for the company, and this led to the switch from post-painted metal to coil coating technology.

Several products at the Trane facility in Cullen, LA, are currently being produced using a new prepainted FAS-NER from AKH Inc., with prepainted metal. The fastener system is a simple punch and die operation, which automatically feeds, punches, inserts and locks a self-piercing fastener to produce a solid joint in one high-cycle operation. The fastener is inserted directly into prepainted metal without the need for pre-punched holes. This feature saves time and labor costs associated with tooling maintenance.

In the past, the Trane air handlers were spot-welded and then post-painted. Now, the products are completely assembled with prepainted metal. Since converting, Trane has seen an increase in productivity and profitability. Trane reports they have also experienced more consistency in the strength of the joint, as well as a better product appearance.

Several major appliance manufacturers also have experienced the benefits of using the combination of the AKH FAS-NER and prepainted metal. The fastener color is matched to the color of the finished product, allowing for the elimination of post-paint operations.

Numerous Benefits

The benefits of prepainted metal are many. It can be used for most product applications and will provide manufacturers with a streamlined manufacturing process, cost savings and a more environmentally friendly plant.

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SIDEBAR: 5 Misconceptions about Coil Coating

Although the prepainted metal process has been around for years, a few misconceptions about the process still exist.

Like most manufacturers, companies are often burdened with adapting their paint shop to changing environmental standards, strict health regulations and increasing overhead. Businesses are trying to lower costs and remain competitive. Outsourcing the metal treatment and coating operations can alleviate or even eliminate these costs.

One recommendation is to establish a prepaint conversion team, consisting of internal and external managers and suppliers, to analyze the products and process to determine if prepaint conversion is practical. This team can also act as a steering committee once implementation begins.

After the initial analysis determines that the use of prepaint is practical, a cost justification study should be conducted to determine the full economic impact of the proposed conversion. This analysis should answer three major questions:

• What additional costs will be incurred by converting to prepaint?
• What is the offsetting cost savings from eliminating post-paint?
• What is the bottom-line benefit of converting to prepainted metal?

Once the conversion process is complete, the plant will run more efficiently, more effectively and more economically. Switching to prepainted metal can improve your product and your bottom line.

Coil coated metal can be formed without any loss in surface quality or appearance. In fact, the paint system can be designed to have greater flexibility than the metal and can be shaped with a finish that is actually superior to post-paint. This is because post-painted surfaces often suffer from dirt and oil residue, uneven application, and other imperfections. After the metal has been precleaned, preprimed, pretreated and prepainted, it can be formed. The paint layer is often more flexible than the underlying metal substrate.

Some manufacturers are concerned with exposed cut-edge on prepainted metal, but research has shown that prepainted cut-edge actually holds up better over time than post-painted surfaces. The National Coil Coating Association (NCCA), with the help of PPG Industries, Inc. and the North American Zinc-Aluminum Coaters Association (NamZAC), compared the corrosion resistance of prepainted cut-edge with three types of post-paint.

Prepainted metal louvers with exposed cut edges were tested in the field alongside three sets of metal louvers, one with a post-painted electrocoat, a second with a powder finish and a third with a spray finish. The parts were made of hot dipped galvanized steel, and the louvers were exposed to the same environment over time in Daytona Beach, FL. After 16 months, 44 months and 68 months of exposure to the elements, comparisons showed that the corrosion resistance of the prepainted parts was repeatedly and significantly better than the post-painted parts.

The reason the prepainted parts outperformed post-painted ones is that prepainted metal sheet is uniformly cleaned, pretreated and painted as a flat surface, so the edge-to-edge and side-to-side variability is virtually eliminated. In addition, the prepainted part has two coats (primer and topcoat), and each is tightly bonded to the metal as compared to a post-painted part, which generally has only one coat of paint. In most cases, the prepainted part has paint (one or two coats) on the backside; in comparison, post-painted parts at best have a minimal amount of overspray. Uniform pretreatment and paint on the backside of a part increases the corrosion resistance of the part, enhancing long-term durability.

More and more manufacturers are realizing that precoated metal can be joined easily - using adhesives, a variety of mechanical assemblies with or without fasteners, or even welding - and still retain a more beautiful and flawless surface than post-painted metal.

Using adhesives as a joining method offers a variety of benefits such as smooth surfaces, clean contours and uniform stress distribution. Adhesives also seal joints away from the elements. Mechanical assembly works well with prepainted metals, both with and without fasteners. Nuts, bolts and screws are cost-effective fasteners that offer design flexibility and allow for parts to be disassembled. Using rivets offers excellent shear and tensile strength as a fastener. Prepainted metals can also be assembled without fasteners by using a variety of methods, including lock and seam, pierce and tab, or stake and clinching methods. Welding is also an option for joining prepainted metals. Working closely with a coil coater can make welding an attractive joining option.

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5. Myth: You can&#;t handle coil-coated metal without marring the surface.

Fact: Precoated metal can be shipped on flatbed trucks, moved using forklifts, stored as coils for long periods - and still retain a more beautiful and flawless surface than post-painted metal. Prepainted metal can be handled successfully without harming the surface.

Source: NCCA


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SIDEBAR: 10 Signs a Manufacturer Should Consider Prepainted Metal

Converting from in-house post-painted metal to outsourced prepainted metal can save manufacturers money and time, and can ensure that products are the highest possible quality. The most important issues to consider when converting to a prepaint operation are timing, capital outlay, manufacturing costs and environmental compliance. Following are 10 indicators that a manufacturer should consider using prepainted steel or aluminum:

1. In-house paint shop expenses are on the rise. When maintenance budgets are growing and capital investments are required to comply with strict EPA regulations, prepainted metal and aluminum is often a cost-effective alternative to in-house paint lines. Many hidden costs are associated with in-house spray or powder operations. Staffing with trained personnel, equipment, supplies and even environmental compliance all contribute to the expenses of owning an in-house paint shop.

2. Internal operating costs need to be lower. Many manufacturers are searching for ways to lower operating costs in order to remain competitive. Through outsourcing prepainted metals, factories can eliminate costly in-house paint operations and the associated expenses of manning the production line. Some of the major cost savings of prepaint conversion include inventory, environment, insurance, cleaning and waste removal, purchasing raw materials, and operating costs.

3. Plant capacity must be increased. By purchasing prepainted metal, plants are actually outsourcing the painting process and can eliminate or greatly reduce the size of in-house paint shops, generating more floor space for other uses.

4. Coating quality needs improvement. Coil coated metals are uniformly cleaned, pretreated, painted and cured as a flat surface, so that the edge-to-edge and side-to-side variability is virtually eliminated. The prepainted part has two coats of paint (unlike powder coating, which has only one) that are bonded tightly to the metal.

5. Downsizing and/or combining plants is taking place. A good time to consider using coil coated metals is when other major manufacturing changes are taking place. Manufacturers can reduce expenses significantly and increase paint quality greatly by outsourcing the painting process. Coil coated metals can be effectively handled, cut with superior corrosion resistance, joined with welding and adhesives, and formed for many uses&#;all with a beautiful finish.

6. New product models are being considered. Many times when design changes are being made, a prepainted metal can be specified and the new design can be more cost-effective to produce.

7. Manufacturing bottlenecks are reducing productivity. Many delays in a plant are caused by paint issues such as stoppage while parts are painted, dried and cured before moving to the next phase of assembly. These bottlenecks can be eliminated with prepainted metal. Prepainted steel and aluminum are uncoiled, cleaned, primed and painted to a manufacturer&#;s specifications and re-coiled prior to shipping to the factory.

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8. It&#;s time to update or replace the paint line. Capital expenditures can be avoided and long-term cost savings achieved by choosing prepainted steel and aluminum, rather than refurbishing or replacing a paint line.

9. A strategy of outsourcing is being implemented. Purchasing prepainted metals is a cost-effective outsourcing option that actually improves the durability of the coating.

10. New fabricating or material handling equipment is being evaluated. When significant changes are made at the plant, it creates an opportunity to improve many aspects of the manufacturing process, including the use of prepainted metal.

Source: NCCA

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Prepainted Metal Coatings: Aesthetic and Functional Properties

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Prepainted metal not only offers an impeccable finish and endless color and design options, it also offers an abundance of functional properties. Coil coated metal can be made weatherproof, corrosion resistant, UV resistant, anti-bacterial and even smog-eating. It&#;s more than just steel or aluminum coated with paint. It&#;s the result of multiple layers, state-of-the-art coatings chemistry, and processes that provide durability and unique properties not possible with traditional coating methods.

Coil coated metal is first thoroughly cleaned and chemically pretreated, after which two to four coats of high-tech paint coatings are applied. Because prepainted metal is cleaned, pretreated, and coated when flat&#;before it is formed&#;an extremely high level of control is possible, which results in superior uniformity across the strip and throughout the coil. The separate layers within the prepainted metal system have been specifically designed and approved to work in concert to create a highly durable and robust product to meet virtually any requirement. For example, prepainted solar panels include a synergy of precisely layered high-tech coatings that absorb and reflect heat to maximize the efficiencies in energy applications.

Prepainted metal provides a highly flexible coating, capable of severe bends, while retaining an excellent degree of hardness and resistance to marking. In many applications, the demands on prepainted metal are extremely rigorous. The finish must maintain its appearance for the life of the product (50 years, or more, in some cases) by being able to resist color fade, corrosion, chemical attack, dirt retention, high temperatures, various extreme weather conditions, and daily wear and tear. No matter what the needs are, there is no comparison between the technical capabilities and durability of prepainted metal as compared with traditional painting methods. Prepainted metal can extend the life of a product, provide cost efficiencies, and even make certain high-tech products achievable.

Color

Color can add excitement and increase consumer demand for products from computers to appliances to building products. Remember the rush for avocado and harvest gold kitchen appliances in the s, and red appliances more recently? You need to take advantage of trends, but changing colors as consumer tastes change can come at a huge expense for manufacturers. Adding paint lines or changing colors for short product runs can be a costly gamble. Prepainted metal offers a broader range of color without the cost.

Any color you (or your customers) can dream up is possible with prepainted steel and aluminum coils. If pink is the new black this year, you can follow the trend economically by outsourcing your painting to a coil coater. Coil coaters can even provide stylish options such as the look of brushed steel, polished copper, wood grain, fingerprint proof surfaces, and more&#;all to enhance consumer appeal.

Not only is the manufacturer able to introduce new, chic colors quickly, the metal often has a better quality coating. Paint and pretreatment processes used by coil coaters can be a much higher quality than most in-house operations. That&#;s because the coil coating process paints the uncoiled steel or aluminum edge to edge, and often on both sides, with a consistent coat thickness.

Texture

In the s, a new trend in architectural design blossomed in European countries such as Germany and Poland and the trend has now taken hold in the U.S. As more color and pattern options become available to the market, architects across the U.S. have been incorporating textured products into their design considerations.

While textured paint is often found in roofing applications, the visual and textural innovations of recent years have opened up textured products to a number of different residential, OEM, and commercial applications. Churches, firehouses, barns, and many other types of buildings are using textured paints to recreate the rustic feel of wood, stucco, brick, single skin metal panels, stone, or asphalt. Textured paint works well in a wainscoting, garage door, or a side wall application, where the textures can be viewed and felt up close.

Textured paint can be made to resemble the textures of countless materials, including asphalt, stone, concrete, barn siding, and other materials. With the growing number of textures and finishes available, architects can meet client demands for visual depth and eye-catching designs that differentiate them in the market and give their buildings a unique look.

Most designers find that textured products are just as durable and perform as well as any other painted metal system. Contrary to popular belief, dirt and debris becoming trapped within the paint&#;s texture is not an issue for concern. As technology advances, the manufacturing processes for textured products have become as seamless as any other paint system.

Textured paint is designed to be scratch-resistant and reduces the appearance of oil canning, dents, and other imperfections that may occasionally be found on long panels. And for high traffic areas, textured products have the benefit of repelling fingerprints which can sometimes be highly visible on flat painted metal products.

Antimicrobial

Bacteria, mold, mildew and other fungi are growing concerns in places like medical facilities, food service, office buildings and more. Building owners and managers must protect occupants from the health threats posed by these environmental contaminants. Antimicrobial coatings are the solution.

Fingerprint Resistant

Consumers are demanding home appliances in a full magnitude of color and finishes. As a result, fingerprint resistant coatings and embossing have also grown in popularity. Fortunately, the coil coating industry kept its finger on the pulse of product design and has developed numerous fingerprint resistant coatings. Never again will your customers have to wipe away fingerprints on refrigerators or other appliances.

Solar Reflective

With reflective coatings your products can help reduce your customer&#;s energy costs and increase their comfort. Using solar reflective coatings cuts down on heat buildup on metal roofs, trailers, campers, shipping containers and more. These cool coatings reflect infrared radiation, which is the &#;heat&#; that we sense on a sunny day. Prepainted metal roofs are energy efficient, durable and sustainable. They can be formed and prepainted to simulate common residential roofing materials, such as asphalt shingles, cedar shake, tile or even slate. Advancements in coil coating technology now make it possible for prepainted metal roofs to feature many different linear and multi-dimensional looks to complement other homes in the neighborhood. Homeowners like metal roofs because they are attractive, lightweight, durable and fire-resistant.

A variety of environmental benefits are also attributed to the rise in prepainted metal roofs. &#;Cool&#; infrared-reflecting pigment technology is specifically designed to reflect heat, helping to reduce energy needs and mitigate environmental problems like Urban Heat islands and smog.

Anti-Graffiti

Graffiti is an eye sore and a maintenance headache for commercial and industrial facilities, transportation companies, city leaders and more. In the past, preventing or eliminating graffiti was almost impossible. But now, coil coaters can provide steel and aluminum with anti-graffiti coatings that make tagging structures much more difficult and clean up much easier. Sometimes clean up requires nothing more than a garden hose.

Anti-Static

In today&#;s high-tech manufacturing facilities, where advanced computer technology is being developed, clean rooms are required. That&#;s because seemingly innocent particles such as lint and dust can produce product failures. A coil coater can alleviate these problems with anti-static coatings that help keep particle build up to a minimum on HVAC surfaces, manufacturing equipment and more.

Insulated Metal Panels

Prepainted IMPs provide architects the ability to create unique designs free of restriction with multiple profiles, colors, reveals and custom modular widths, resulting in aesthetically pleasing design options for horizontal and vertical applications. The coil coating process offers engineered paint systems for a wide variety of applications that also provide excellent flexibility and hardness that can be formed into a prepainted finished product with performance characteristics superior to post-painted metal.

IMPs are considered the ultimate solution for the architectural, commercial, industrial, cold storage and residential markets due to their excellent insulating and weatherproofing characteristics. IMPs have a continuous insulating foam core that is formed together between two sheets of coated metal to provide resistance to air, moisture and thermal transfer conditions for increased building envelope performance.

Interior Applications for Coil Coatings

1) Interior Walls. Prepainted interior wall panels are available in a large number of differing profiles including ribbed, insulated (foamed), composite, and architectural shallow flat styles. These panels are lightweight and are installed more quickly than traditional walls. They can also take on dramatic shapes with colors or laminates that create striking design elements.

2) Ceilings. Suspended ceiling tile systems in offices, airports, official buildings, and exhibition halls are often made with prepainted metal. These ceilings are chosen for their light weight, high heat and sound insulation qualities, durability and decorative appearance.

3) Surfacing. Back splashes, decorative wainscoting, and column surrounds are often made of prepainted metal. The durable prepainted metal with good abrasion resistant coatings hold up under heavy commercial use, providing protection and good looks for many years.

4) Interior Doors. Most all-metal door manufacturers today choose prepainted metal for its durability, ease of manufacturing and color and texture options (such as wood grain). The prepainted metal can outlast other materials such as wood, and the coating process provides many environmental benefits for manufacturers.

5) Windows. Window frames and casings can be made with prepainted metal. Prepainted metal makes it more economical for manufacturers to provide color variety and eliminates environmental compliance issues related to painting. The coating is bonded so tightly, the metal can endure the sharp bends required to make window parts. Plus, metal frames often outlast wood frames.

6) Lighting Fixtures. Manufacturers use this prepainted metal to fabricate lighting fixtures such as recessed lighting, housing and trim and fluorescent ceiling fixtures. Highly reflective coatings are applied to light gauge metal with the coil coating process.

7) Cabinetry. Manufacturers of industrial and residential cabinets use metal that has been painted by a coil coater because of the combination of great looks and hassle-free maintenance. Decorative coatings (such as bold colors, the look of stainless steel, wood patterns, faux patinas, and more) are applied to the metal to provide attractive appearance. Coatings also provide functional advantages, including corrosion resistance, conductivity, and functionality.

As you can see, prepainted metal covers the needs of countless applications where appearance and functionality are critical.

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