What is color-coated aluminum?
Color-coated aluminum is a kind of aluminum that is coated with a layer of paint of various colors on the surface of the aluminum coil after cleaning, chroming, roller coating, baking and other processing processes.
The coating can effectively avoid the attack of ultraviolet radiation, corrosive gas and microbial effects, thereby extending the service life of aluminum.
According to the different paint coatings, color-coated aluminum is divided into polyester color-coated aluminum (PE), fluorocarbon color-coated aluminum (PVDF), chameleon coating aluminium and HDP aluminum. They are usually widely used in the form of sheet or coil in the construction, decoration and other industries.
Worthwill's color-coated aluminum specifications
Worthwill can customize and produce color-coated aluminum sheets and coils with various coatings based on customer needs, such as front polyester coating, back epoxy coating, front fluorocarbon coating, back epoxy coating, front PE coating and varnish coating, back PE coating, etc.
Specifications
Alloy: 1000 series, 3000 series, 5000 series aluminum
Aluminum coil thickness: 0.2mm-2.00mm
Aluminum plate thickness: 2.00mm-6mm
Standard width: 1000-1250mm
Special width: 50mm-2000mm
Tube core diameter: 150mm, 405mm, 500mm, 505mm, 510mm
We can also provide wire drawing, anodizing, mirroring, kaiping, slitting, stripping, cut to size and other processing according to customer needs.
Coating
Coating process: usually roller coating process, special-shaped parts can use spraying process
Painting: PE, PVDF, HDP, epoxy paint, etc.
Coating hardness: greater than 2H
Adhesion: not less than level 1
Glossiness: 10-90%
Impact resistance: 50kg/cm without paint peeling and cracks
Coating brand: AkzoNobel, Nippon, PPG, Beckers
Paint coating thickness:
- Single coating (4-20 microns)
- Double coating (25-28 microns)
- Triple coating (30-38 microns)
Surface
Worthwill's coating system can also be combined with special coating technology, such as antistatic, antibacterial, printing coatings, imitation stone grain, imitation wood grain, etc.
Color: up to hundreds of colors, the color can be determined according to the samples provided by the customer, and the color can also be adjusted according to RAL and Pantone international color cards.
Color-coated aluminum production process
We strictly implement the safety production regulations of Jurun new materials, strictly control every process of the production process, and reduce the defective rate.
Step 1: Pre-treatment before color coating
- Surface processing, such as brushing, polishing, and embossing.
- Hot water cleaning to remove surface oil and impurities.
- Hot alkali degreasing to make the surface brighter.
- Passivation treatment to facilitate coloring and increase color adhesion.
Step 2: Roller coating (single coating)
- Primer roller coating
- Drying
- Cooling
Step 3: Topcoat roller coating (double coating)
On the basis of single coating, topcoat roller coating is generally performed as follows:
- Topcoat roller coating
- Drying
- Cooling
Step 4: Finishing paint roller coating (triple coating)
- Finishing paint roller coating
- Drying
- Cooling
- Laminating
Step 5: Subsequent processing
- Slitting
- Tile pressing
- Slab cutting
- Striping
- Reeling
Other processes
If you need imitation stone grain or wood grain color-coated aluminum, we need to process it after the first roller coating, that is, single coating. The specific steps are:
- Printing
- Finishing paint roller coating
- Drying
- Cooling
- Laminating
1000 Series Alloys
1000 series color-coated aluminum, with high-purity
aluminum as the base material, has good ductility, plasticity and corrosion
resistance, good weather resistance and decorative properties.
- Alloy
- 1050, 1060, 1070, 1100, 1200, 1350
- Temper
- H42(H22), H44(H24), H46(H26), H48(H28)
- Size
-
Thickness(mm): 0.18-3.0, Width(mm): 100-1500
- Coating
- PE, PVDF, Epoxy
3000 Series Alloys
3000 series color-coated aluminum, mainly aluminum-manganese alloy, has good corrosion resistance and weldability, high color stability, easy processing, etc.
- Alloy
- 3003, 3004, 3105
- Temper
- H42(H22), H44(H24), H46(H26), H48(H28)
- Size
- Thickness(mm): 0.18-3.0, Width(mm): 100-1500
- Coating
- PE, PVDF, Epoxy
5000 Series Alloys
5000 series color-coated aluminum, mainly aluminum-magnesium alloy, with a magnesium content between 3-5, low density, high tensile strength, high strength and good corrosion resistance, etc.
- Alloy
- 5005, 5052, 5454, 5754
- Temper
- H14, H16, H22, H24, H26
- Size
- Thickness: 0.2mm-3.0mm, Width: 100mm-1500mm
- Coating
- PE, PVDF, HDP, epoxy paint, etc.
8000 Series Alloys
8000 series color-coated aluminum, such as
aluminum-tin alloy and aluminum-lithium alloy, has higher strength and
lightweight characteristics, and various coating types.
- Alloy
- 8011, 8079
- Temper
- H14, H16, H18, H19, H22, H24, H26, H28
- Size
- Thickness(mm): 0.18-3.0, Width(mm): 100-1500
- Coating
- PE, PVDF, HDP, epoxy paint, etc.
Polyester color-coated aluminum coil (PE)
After the surface of the aluminum coil is repeatedly baked and painted, the aluminum coil with polyester coating on the surface of the aluminum coil is called polyester color-coated aluminum coil.
PE (Polyester) is an anti-ultraviolet coating that not only has protective and decorative properties, but also has good gloss and smoothness, increasing the corrosion resistance and durability of items, especially suitable for interior decoration and advertising boards.
Pre-treatment coating thickness requirements:
Primer: 5 microns
Topcoat: 15-25 microns
Recommended back coating thickness
Primer: 5 microns
Topcoat (optional): 3-5 microns
Fluorocarbon color-coated aluminum coil (PVDF)
Fluorocarbon color-coated aluminum has good gloss, wear resistance and weather resistance without color difference. In harsh climates and environments, it has longer fading resistance and UV resistance than PE-coated aluminum coils, and its service life reaches more than 20 years, often used outdoors.
Fluorocarbon coatings can be divided into two categories based on their floor film-forming structure: ordinary fluorocarbon coatings and nano-fluorocarbon coatings.
Pre-treatment coating thickness requirements:
Primer 5 microns
Topcoat 20-28 microns
Recommended back film thickness:
Primer: 5 microns
Topcoat (optional): 5 microns
HDP color coated aluminum coil
HDP (High-density Polyester) high weather-resistant color-coated plate uses HDP polyester coating, which has good durability, high molecular weight resin, few polymer branches, stable bond energy, not easy to photolyze and therefore not easy to powder, and high gloss.
Pre-treatment coating thickness requirements:
Primer 5 microns,
Topcoat 20~22 microns
Recommended back film thickness:
Primer 5 microns,
Back paint 5 microns
Color: Color matching services can be provided according to user requirements. Due to weather resistance requirements, some colors need to be replaced with similar colors instead of standards
Gloss: Gloss is 35 +/-5. Other gloss ranges can be provided according to user requirements
Marble & Granite and wooden finish aluminium
Stone-grained aluminium sheets use roller coating and spraying processes to apply stone textures on the aluminium surface, giving the aluminium sheet the appearance and feel of stone, making the aluminium sheet more decorative. Common stone-grained aluminium sheets include marble-grained aluminium sheets, grey stone-grained aluminium sheets, brick-grained aluminium sheets, granite-grained aluminium sheets, etc.
Wooden finish aluminium is to attach wood textures to the surface of plain aluminium, making it look like natural wood.
Commonly used in the production of Marble Aluminum Composite Panel (ACP), or indoor and outdoor building curtain walls, home decoration, etc.
Alloy: 1000, 3000, 5000 series, etc.
Temper: H14, H16, H32, H34, etc.
Thickness: 2.0mm -5.0mm, usually less than 2.5mm for indoor use, and more than 3mm for outdoor use, general specifications are 3mm, 4mm, 5mm
Specifications: 1000*2000, 1220*2440, 1200*2400, 1500*3000, etc.
Certification: CE, ISO, SGS, etc.
Coating: PE, PVDF, powder coating
Coating thickness: double coating thickness is about 25-30μm, triple coating thickness is more than 30μm, coating is more stable
Mirror color coated aluminum Coil
The color coated mirror aluminum coil uses high purity aluminum bases such as 1100, 3003, 3105, etc., ensuring that the aluminum purity is above 99.8% and the mirror reflectivity reaches 85%
Using a special processing technology, the surface clarity of the color coated mirror aluminum reaches more than 94%.
Performance parameters
Thickness(mm) 0.20-0.80，Tolerance±0.02
Width(mm) Below 1600，Tolerance ±2
Reflectance ≥85%，Tolerance ±1
Diffuse reflectance，Tolerance& <20±0.5
Direct reflectance more than 80，Tolerance±1
Degree of imaging 92，Tolerance±2
Aluminum jacketing with polysurlyn moisture barrier (PSMB)
"Aluminum Coils with Polysurlyn Moisture Barrier (PSMB)" is a special aluminum coil product, the surface of which is coated with a layer of moisture-proof material called Polysurlyn.
The Surlyn film moisture barrier is made of high-density polyethylene and ethylene copolymer resin. The three-layer composite film is hot-applied to the inner surface of the aluminum to form a solid moisture barrier.
The moisture-proof material of Polysurlyn is composed of three layers: the first layer is polyethylene (PE) film, the middle layer is ion polymer (Surlyn) containing zinc ions, and the third layer is ethylene-acrylic acid copolymer (EAA).
Custom Specifications:
Standard ASTM B209 / C1729
Alloy 1100, 3003, 3105, 5005, 6061, 6082.
State H14, H16, H24 Other special states can be customized according to customer requirements
Thickness 0.3mm to 1.5mm
Width 914mm, 1000mm, 1219mm.
Other widths can be customized according to customer special requirements.
Length 100 feet (30 meters), 200 feet (60 meters). Big rolls,
Other lengths can also be customized according to orders.
Pvdf coating vs Polyester coating
Weather resistance comparison:
PVDF coating: has excellent weather resistance, can resist adverse weather conditions and ultraviolet rays, and generally has a corrosion resistance life of 20 to 25 years in ordinary environments.
PE coating: has poor weather resistance, low ultraviolet resistance, and a service life of about 7-8 years.
Chemical resistance comparison:
PVDF coating: has excellent chemical resistance and can resist corrosion from a variety of chemicals.
PE coating: has relatively poor chemical resistance and is not suitable for use in corrosive environments.
Mechanical property comparison:
PVDF coating: has excellent mechanical properties, including tensile strength and ductility.
PE coating: has average mechanical properties, not as good as PVDF coating.
Heat resistance comparison:
PVDF coating: has good heat resistance and can maintain performance at high temperatures.
PE coating: has relatively poor heat resistance.
Abrasion resistance comparison:
PVDF coating: has good wear resistance and can provide long-term protection of metal surfaces.
PE coating: has average wear resistance.
Cost comparison:
PVDF coating: has a higher cost, but is generally more cost-effective due to its long life and excellent performance.
PE coating: Low cost, the most economical among several coatings, but with a short service life.
Application field comparison:
PVDF coating: Commonly used in chemical facilities, power plants and high-speed railway stations and other places that require high corrosion resistance and weather resistance.
PE coating: Often used as a primer due to its good adhesion, but not suitable for highly corrosive environments.
Color retention comparison:
PVDF coating: Good color retention, not easy to fade.
PE coating: Poor color retention, easy to fade.
Gloss retention comparison:
PVDF coating: Good gloss retention, can maintain metallic luster for a long time.
PE coating: Gloss retention is average, not as good as PVDF coating.
Environmental adaptability comparison:
PVDF coating: Suitable for use in harsh environments, including high salt spray environments.
PE coating: Suitable for ordinary environments, but poor performance in harsh environments.
Summary:PVDF coating is an ideal choice for long-term protection and high-quality appearance due to its excellent weather resistance, chemical resistance and color retention, especially for harsh environments; while PE coating is widely used in industrial and commercial applications due to its high cost-effectiveness, although its durability is not as good as PVDF coating.
Coating process
The coating processes for color-coated aluminum coils and aluminum sheets include roller coating and spray coating.
Roller coating refers to the continuous and uninterrupted degreasing, chemical pretreatment and color coating of the aluminum substrate.
Spraying is to use the negative pressure generated by compressed air at the spray gun nozzle to spray the paint in the paint container from the paint nozzle to paint the aluminum plate. It can be sprayed with water-based paint or powder spray.
Roller coating vs. spraying
|
Features |
Roller coating |
Spray coating |
|
Number of coating layers |
Front coating, color showing coating |
One layer of hand-coated topcoat |
|
Primer, coating between front coating and aluminum plate |
||
|
Back coating, anti-corrosion coating on the back of aluminum plate |
||
|
bake |
Double baking |
One-time baking |
|
Coating thickness |
Uniform thickness |
Relatively uneven |
|
Chromatic Aberration |
Basically no color difference |
Easy to age and have color difference |
|
Supported experiments |
Impact test, cross-cut test, T value test, solvent resistance test, aging resistance test |
Impact test, etc. |
|
Applicable Products |
Flat surface |
No requirements, flat surfaces and special-shaped products can be sprayed |
Application of color-coated aluminum
Color-coated aluminum coils are used in the construction industry, interior decoration, electronic product housings, road signs and other fields, such as:
Aluminum-plastic panels
Honeycomb panels
Insulation panels
Aluminum curtain walls
Blinds
Roller shutters
Aluminum-magnesium-manganese roofing systems
Aluminum ceilings
Household appliance panels
Downpipes
Decorative aluminum coils (aluminum trim coils)
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Common issues of aluminum color coils
Color-coated aluminum coils may encounter some problems during the manufacturing and use process. The following are some common problems and their solutions:
Coating peeling off
Reason: Irregular defects caused by the aluminum-clad layer of the composite material leaving the matrix and falling off.
Solution: Make sure the adhesion between the paint and the substrate is good, and check whether the surface treatment before painting meets the standards.
Color difference batch difference
Reason: The irregular color difference on the roll surface caused by strip wrinkles, strip breakage, etc. is periodically printed on the strip surface during the rolling process.
Solution: Optimize the rolling process to reduce uneven deformation of the strip.
Wave
Reason: A general term for various uneven phenomena caused by uneven deformation of plates and strips.
Solution: Improve processing accuracy and ensure the flatness of the plate.
Split level
Reason: The end surface of the strip is irregularly shifted between layers, causing the end surface to be uneven.
Solution: Improve the coiling process to ensure the stability of the strip during the coiling process.
Holes, missing paint
Reason: There is a defect in the quality of the substrate. If the substrate has serious edge damage and chips, and there are holes in the substrate.Solution: Check the surface of the board base to avoid holes and missed coatings.
The solution to the above problems requires comprehensive consideration of raw materials, equipment, processes, environment and other factors. During the production process, strict control and optimization of these links can effectively improve the quality and performance of color-coated aluminum coils.
Aluminum color coils inspection methods
Coating film thickness color difference gloss test
Magnetic thickness gauge method: Based on the magnetic flux or mutual inductance current of the probe to the magnetic substrate, the thickness of the coating is measured by using the linear change value of the probe's magnetic flux or mutual inductance current based on the different thicknesses of the non-magnetic coating on the surface.
Colorimeter detects color difference. There are many types of colorimeter. The principle is to measure the tristimulus value (the amount of the three primary colors red, green and blue) of the reference sample and the sample, which can quantitatively measure the color of the sample and the reference sample. difference.
Gloss meter measures gloss, tolerance ±5.
Cross-cut test
The principle of the Cross-cut test is to use a blade of a specific specification to carve a square grid on the coating surface at a certain angle with appropriate pressure, and stick it on the square surface with tape. Pull the tape vertically, and The extent of paint stripping in the checkered areas is compared to standard paint stripping requirements to determine coating adhesion.
MEK wipe
Dip a cloth or sponge into an appropriate amount of MEK and gently wipe the surface of the color-coated aluminum roll. Use moderate attention to avoid damaging the coating due to excessive force. Wipe from top to bottom, left to right, ensuring even coverage of the entire surface. If the paint does not peel off, it proves qualified.
Impact test
The hammer of the tester hits the sample violently, causing the sample to rapidly deform and form a bulging area. The coating is then inspected in the affected areas to evaluate the coating's resistance to cracking or peeling. There are 5 different levels.
L5: The coating has no peeling or cracking;
L4: The coating does not peel off, but there are cracks;
L3: There are tiny cracks in the coating;
L2: The coating has slight peeling;
L1: The coating peels off at the bending and impact areas.
L3, L4 and L5 are qualified products.
Corrosion resistance test
Salt spray test: In the salt spray test chamber, the color aluminum coil is exposed to a salt spray environment containing a certain concentration to test its corrosion resistance.
Acid and alkali immersion test: Soak the colored aluminum coil in a specific acid and alkali solution to evaluate its ability to resist acid and alkali corrosion.
Damp heat test: simulates a high temperature and high humidity environment to test the performance changes of color aluminum coils in this environment.
Why choose us
Worthwill is a professional manufacturer of color-coated aluminum coils and plates. We strictly implement the production standards required by customers, such as ASTM-B-209M, BS EN 485-2, BS EN 573-3, GB/T3880-2008 and other processing and production.
We have a strict quality control system, such as a safe production system, a product testing system, and a packaging and transportation system to ensure that the products are shipped without defects, and fully comply with local environmental protection laws to truly achieve green production.
Product packaging
Our packaging is standard sea transportation packaging, which fully takes into account the unfavorable factors such as the environment of ocean transportation and the time of transportation to ensure that the products are perfectly delivered to customers. We can also customize the packaging according to the specific requirements of customers.
Environmental protection
The regenerative thermal combustion (RTO) process is used to treat the exhaust gas from the production line. The ceramic regenerator is preheated to above 830°C to achieve complete oxidation of organic matter and convert it into carbon dioxide and water. At the same time, heat is recovered for use in the oven to reduce energy consumption. The RTO process is not only environmentally friendly, with a removal efficiency of more than 98%, but also effectively reduces production costs.
