How to Inspect the Quality of Colored Aluminum Coils?
Colored aluminum coil is widely used building material, ensuring its quality is crucial to ensuring the durability and beauty of the building material.
To test whether the quality of color aluminum coils meets the standards and meets customer needs, mainly testing the surface quality of color aluminum coils (defects, gloss, color, coating fineness, etc.), coating properties (film thickness, T-bend, reverse impact, pencil hardness, salt spray resistance, durability, etc.), and other properties (Aluminum series, dimensional , tolerance, etc.).
What are the aspects of colored aluminum coil inspection?
Material Quality
The basis for processing high-quality colored aluminum coils is to ensure the quality of aluminum. Before processing, it is necessary to ensure that the raw materials of the aluminum coils used meet the relevant standards and have no obvious flaws, oxidation or other defects.
Coating Quality
Observe the coating of the colored aluminum coil to ensure it is even and smooth, with no bubbles, cracks or uneven color. Good coating quality helps improve the durability and appearance of aluminum coils.
Color comparison
Check whether the color of aluminum coils is consistent to avoid significant differences between batches. Consistent color is usually a better indicator of quality.
Coating Thickness
The film thickness of the color coated aluminum coil has great effect on its service life, especiallly in the harsh environment. To ensure the coating quality,check the thickness tolerance and overall thickness that meets customer's specific requirements.To ensure its quality, the manufacter need keeps online test of the film thickness regularly.
Coating adhesion
The adhesion of the coating determines the service life of the color aluminum and the appearance of the building, especially in harsh environments. Therefore, ensuring the adhesion of the coating is the most important project in the inspection.
How to inspect the colored aluminum Coils?
Common colored aluminum coil inspection methods include:
Substrate thickness measurement, Coating film thickness test, MEK test, Gloss test, T-bend, Pencil hardness test, Coin scratch test, reverse impact test
MEK Test
MEK test refers to wiping the paint surface with butanone solvent to determine whether it has been cured.
Test method: According to ASTM D4752 "Test method for measuring butanone resistance of acid ethyl zinc-rich primer by solvent wiping", use a white cotton cloth to dip in MEK reagent and wipe back and forth 50-100 times.
Test standard: If there is no or only slight discoloration on the cotton cloth, curing has been completed. If the discoloration is severe or there is a clear depression on the surface of the paint layer, it means that curing has not been completed.
T-Bend Test
T-bending is to bend the sample 180° with the paint film facing outward. If there is no damage, it can be 0T. If cracks are found, bend it again on this basis. If there is no damage this time, the bending is counted as 1T. By analogy, 2T and 3T can be obtained.
Pencil Hardness Test
Pencil hardness test, also known as the pencil hardness test of coating film. It is a test method and measurement system for calibrating coating film hardness.
Test purpose:In the coating industry, pencils of different hardness are used to test the hardness of the coating.
Test method: Fix the coating sample to be tested on the mobile platform of the tester equipped with a heavy hammer, clamp the pencil on the pencil fixture, and make a 45° angle with the plane of the coating, so that the tip of the pencil is pressed tightly on the coating. Shake the handle, and the mobile platform will move forward with the sample, and let the pencil scratch the coating in turn. After each scratch, change a pencil, starting from the hardest pencil and testing from hard to soft, one by one, until the coating is found. The hardness of this pencil is the hardness of the tested coating.
Coin scratch test
Test purpose: To confirm the adhesion and brittleness of the coating
Test method: Use a one-yuan coin to forcefully scratch the test area of ââthe sample from a horizontal direction at 45 degrees, and repeat the test in several different areas
Reverse impact test
Test purpose: The coating impact test refers to the ability of the coating to resist peeling off or cracking from the substrate when it is deformed by the impact of different spheres under standard experimental conditions, which shows the strength of the tested coating and its adhesion to the substrate.
Test method: After the coating is impacted by the ball, the protruding part is taped with 3M tape to determine the adhesion of the paint film
coating type and Test standard
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|
Paramater |
PVDF Coating Aluminum Coil |
PE Coating Aluminum Coil |
|
Painting coating |
Top-20μm,Back-5μm |
Top-20μm,Back-5μm |
|
Color |
According to customer request |
According to customer request |
|
Glossiness |
Standard: 25+1-5 |
Standard: 35+1-5 |
|
Cross-cut adhesion |
The paint film does not fall off |
The paint film does not fall off |
|
T-bend test |
1T- the paint film does not fall off |
3T- the paint film does not fall off |
|
Reverse impact |
9J -the paint film does not fall off |
9J -the paint film does not fall off |
|
MEK test |
Butanone MEK wiped back and forth 100 times without damage to the paint film |
Butanone MEK wiped back and forth 100 times without damage to the paint film |
|
Heat and humidity resistance |
Placed in the non-condensing damp heat test chamber for 1000 hours, no bubbles, cracks, peeling off of the paint film, no change in color, gloss and hardness |
Placed in the non-condensing damp heat test chamber for 1000 hours, no bubbles, cracks, peeling off of the paint film, no change in color, gloss and hardness |
|
Acid and alkali resistance |
Soaked in 5% hydrochloric acid for 24 hours, no obvious change in appearance Soaked in 5% sodium oxide for 24 hours, no obvious change in appearance |
Soaked in 5% hydrochloric acid for 24 hours, no obvious change in appearance Soaked in 5% sodium oxide for 24 hours, no obvious change in appearance |
|
Neutral salt spray resistance |
Neutral salt spray test for 1000 hours |
Neutral salt spray test for 1000 hours |
|
UV lamp accelerated aging test |
OUVA-340 UV lamp test box 2000 hours of light, no bubbles, cracks and other defects. |
OUVA-340 UV lamp test box 2000 hours of light, no bubbles, cracks and other defects. |
|
Service life |
30years |
15years |
|
Application |
PVDF is well suited for outdoor applications and environments where the coating may be exposed to harsh chemicals or strong light. |
PE is suitable for indoor applications, temporary buildings and applications with good environment. |
Company Profile
Shandong Hanchen Metal Co.,Ltd is a professional color coated aluminum manufacturer integrating production, sales and trade. We have professional two automatic production lines with four-roller coating equipment. The whole production process has strict quality control and inspection. Our main products are aluminum coils and prepainted aluminum coils,widely used in metal roofing, aluminum ceiling, aluminum composite panel, aluminum sandwich panel, aluminum honeycomb panel and so on. We are committed to providing customers with high-standard products and satisfactory services and highly efficient solutions.
01
Factory Direct Supply
We have professional four-roller coating equipment and two automatic production lines, which greatly improve production efficiency, ensure production quality, save manpower and production costs, and make pricing more reasonable
02
Strict Quality Control
Our factory equipped with strict quality control and inspecting systems and also conduct inspecting through third-party inspecting agencies, such as QIMA. We are committed to providing customers with high-standard color coated aluminum coils
03
Supply Capabilities
Our annual output of color aluminum coils is 300,000MT, which can be supplied to multiple major customers at the same time within a short delivery period while ensuring product quality.
04
One-Stop Services
We will arrange professionally trained sales to provide customers with pre-sales and after-sales services, who will answer or solve questions as soon as possible and provide customized roof solutions according to customer requirements
Our Factory and Equipment
Our Colored Aluminum Coil
Basic feature
| Thickness | 0.15mm-2mm |
| Width | Max 1650mm |
| Color | Ral colors or based on requirements |
| Coating film | 15-60μm |
| Coating | PE, HDP, PVDF, etc |
| Alloy | AA1100, 3003, 3004 etc |
| Warranty | 15-30 years based on surface coating |
| Package | Eye to wall, eye to sky, coils on wooden pallet |