What is PPGI Coil?
PPGI coil is short for “prepainted galvanised steel coil”. This type of metal coil has a layer of paint and primer on both sides, which provides protection against corrosion and other damage.
PPGI coil is a frequently used material in roofing and cladding applications, as well as in the automotive and appliance industries for manufacturing diverse components.
PPGI coils are usually manufactured from hot-dip galvanised steel. The steel is coated with a layer of paint and cured at high temperatures to produce a durable and long-lasting finish. The rolled metal strips undergo a continuous process where organic coating material is applied according to the EN-10169-1 standard.
During this process, cleaning and chemical pre-treatment is performed on each side of the metal surface. A single or multiple applications of coating powder or paint is then applied, before they undergo lamination and curing with plastic films to guarantee the longevity of the coating.
Profile Structure of PPGI Coils
PPGI coil delivers enduring and robust performance over time. The process ensures consistent cleansing, coating and pre-treatment of the metal surface. The precise and controlled coating procedure provides the metal coil with multiple complementary layers, comprising the following:
Top coatings could be liquid paint, film, or powder paint. Prepainted metals have over 90 percent liquid paint.
Manufacturers may customize the coating layers depending on the application and customer specifications. It’s the coil coater’s job to choose the pre-treatment and primer for the substrate and top coating combination.
The coating thickness includes a thin layer of primer , but most coatings are the top coat. In some applications, a thick primer could be a high-build polyurethane. It comprises 50 percent of the total coating thickness.
A coil coating line operates continuously at a fixed speed in a processing area, utilizing strip accumulators positioned at the end of each line. The line features entry decoilers, cleaning equipment, a primer coat, chemical pretreatment, curing, a final coat, an exit accumulator, and exit recoilers.
The primary aim of the coating line is to apply a layer of paint or other finishing materials to metal coils. This process is essential in the construction, automotive, and appliance manufacturing industries. It guarantees the longevity, resistance to corrosion, and aesthetic quality of metallic products.
Typically, the coil coating line undergoes multiple phases. Initially, the metallic coils are cleansed and pre-treated to eradicate any surface impurities and ready the surface for coating.
Subsequently, a layer of primer is administered to augment adherence and combat corrosion. The primer is then heated for curing to establish proper bonding to the metal.
Once the primer is cured, the metal coils receive a topcoat of paint or other finishing materials, such as laminates or adhesives, followed by a topcoat application. Depending on the specific requirements of the product, this application can include roll coating, spray coating, or electrostatic coating.
Thereafter, the metal coils undergo a heating process to cure them again. This step guarantees that the paint or finishing materials stick to the metal surface and deliver the desired level of protection and durability.
The processing of the coil coating line presents several benefits over conventional painting techniques. It facilitates a consistent, high-quality finish that is consistent across the whole metal coil surface. Additionally, it delivers excellent corrosion resistance and durability, which are crucial for products subjected to severe environmental conditions.
Which is superior: PPGI Coil or PPGL Coil?
Whether PPGI or PPGL coils are better depends on the specific application and requirements. Know their differences:
PPGI coils have a zinc coating that provides excellent corrosion resistance and durability. It is typically used for indoor applications or outdoor applications where there is minimal exposure to harsh weather conditions.
PPGL coils have zinc and aluminum coatings that provide superior corrosion resistance and durability. It is suitable for outdoor applications where it will be exposed to harsh weather conditions. The aluminum also provides better heat resistance than zinc, making it a good choice for applications that require heat resistance.
PPGL weighs less than PPGI because aluminum is lighter than zinc. The aluminum-zinc coating with the same thickness of coating covers three percent more space compared to PPGI coil.
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The service life of PPGI is shorter than PPGL, as it depends entirely on its zinc coating. The aluminum-zinc alloy of the PPGL alloy offers corrosion resistance. It can last up to three times longer compared to PPGI.
In terms of aesthetic value, PPGL has a smoother surface than PPGI. The aluminum in PPGL offers high-performing adhesive properties compared to PPGL. Galvanized sheets require more pretreatment for painting.
PPGL is more costly than PPGI due to its high performance. There are fewer licensees and manufacturers of PPGL. The cost of a PPGL sheet is 3 to 11 percent higher than that of a PPGI coil.
Purchase Guide
Choosing the right PPGI Coil material is related to the purpose and environment. PPGI Coil consists of galvanized steel coils and different paints. Here’s how to choose.
Choose galvanized steel sheet
Grade
Galvanized coil is the substrate of PPGI Coil, the first choice is to confirm the steel grade of galvanized coil, which is related to the use of PPGI Coil. Choose commercial steel and structural steel for construction. Commercial steel is a cold forming low-carbon steel for bending and prfiling quality. It is usually processed into corrugated roof tiles by cold forming machines. Structural steel is used for building facades and lightweight steel structures with a focus on yield strength.
Common commercial steel grades are DX51D to EN 10346 and CS type A to ASTM A653. Structural steel is S250GD, S280GD, S350GD, S550GD, etc. according to EN 10346 standard, and the number 550 means the yield strength is 550Mpa.
In addition to the application in the construction field, PPGI Coil can also be used as the shell of home appliances. For example, the shell of lamps needs DX52D material with drawing quality.
Zinc layer weight
The coating mass of galvanized sheet for construction is usually 30-275 g/m2. Z275 galvanized coil substrates are used in highly corrosive environments such as coastal areas, and Z100 galvanized coil substrates can be used in housing construction in ordinary environments.
Choose Paint
Polyester is PPGI Coil’s most widely used paint and it can provide an economical product. Has low resistance to the effects of UV rays and low corrosion resistance to chemicals. Suitable for areas with low environmental corrosion.
SMP has excellent scratch resistance and excellent adhesion, and is easier to chalk and fade under ultraviolet light than PVDF.
The main properties of High durability polyester(HDP) are strong weather resistance and strong corrosion resistance. It is mainly used in areas with long sunshine time, high dryness, large temperature difference between day and night, and strong humidity.
PVDF is relatively strong in anti-ultraviolet rays, not easy to decompose in sunlight, improves anti-fading and chalking ability, and maintains color luster for a long time. PVDF has strong corrosion resistance and is suitable for use in coastal areas.
Durability: PVDF >High durability polyester(HDP)>Silicon modified polyester(SMP)>Polyester(PE)
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Samdo Corporation Ltd President
10 个月What does '550mpa' mean ?
Samdo Corporation Ltd President
10 个月Thanks for the info