Brushed Aluminum Sheet Color Quality Control

Time:2020/06/06 11:00:00 Browse:612

Brushed aluminum sheet is a commonly used material for lamps and lanterns, architectural decoration and exterior wall decoration. Its requirements for color are relatively high. Achieving color quality control of the brushed aluminum sheet is necessary. The brushed aluminum sheet color difference can be measured by a professional handheld colorimeter.

1. Why do we control brushed aluminum sheet color difference?

brushed aluminum sheet
brushed aluminum sheet

In the field of building aluminum alloy profiles and the rapid development of polymer chemistry, the surface treatment technology is diverse and unique. Color requirements for brushed brushed aluminum sheet are also stricter.

2. Knowlege of brushed aluminum sheet

Brushed aluminum sheet refers to a plate formed on the surface of the aluminum plate by two different treatment processes: drawing and oxidation. Brushed aluminum sheet is the manufacturing process of forcing the aluminum plate through the die under the action of external force to pull out the lines. The main process is divided into three parts: deesterification, sand mill and water washing. The aluminum oxide plate is an aluminum sheet that is placed in the corresponding electrolyte as the anode. Under specific conditions and applied current, the main process of electrolysis is divided into degreasing, etching, neutralization, anodizing, coloring and sealing.

After drawing and oxidation treatment, the board can show a variety of different appearance colors, mainly divided into basic colors and metallic colors. In recent years, the metal shells of many aluminum sheet products have special color requirements to achieve a beautiful effect. In order to control the appearance color quality of the brushed aluminum sheet, it can be detected by a handheld colorimeter.

3. How is the color difference of brushed aluminum sheet formed?

After being used for a period of time, the brushed aluminum sheet will have a certain color change problem. Each company will specify a color deviation and products that meet this range can be regarded as qualified products. Therefore, there are many reasons for the color difference of the brushed aluminum sheet, mainly including raw materials, processing methods and so on.

The content of metal elements and material texture of different batches of aluminum sheet are different. It is difficult to achieve the same effect as the sample after multiple adjustments and sample evaluation during coloring.

During the oxidation process, various factors such as the composition, content, concentration, temperature and processing time of the potion may cause different treatment effects, resulting in color problems in the aluminum sheet.

In the closed coloring process of the product, due to the color difference that has existed during the production of the material pre-treatment, the difficulty of sample matching, color matching and color mixing increases.

4. Handheld colorimeter detects the color of brushed aluminum sheet

The reflective properties of oxidized and colored surfaces of aluminum and aluminum alloys are different from those of other objects (such as opaque pigments). The visible color of the oxidized colored aluminum sheet is different from the color of qualified goods. Therefore, when measuring the color and color difference of the brushed aluminum oxide plate, there will be confusion.

This is because the color of the brushed aluminum sheet has a conditional color development property, that is, two identical colors observed under a certain angle or a certain light source will become inconsistent if the viewing angle or light source is changed. For example, when the brushed aluminum sheet is used as the outer wall of a building, due to different environments, weather, time and different viewing angles, the colors seen by the observer will be different. Therefore, if you want to evaluate the color of the brushed aluminum sheet, you need to standardize the color difference measurement standards. The more objective way is to use a handheld colorimeter.

Under the specified observation conditions, the agreed color standard is used as a reference. Use a handheld colorimeter to determine the degree of color difference between the brushed aluminum sheet and the established color standards by the measured color. 

handheld colorimeter
handheld colorimeter

Color measurement function: Linshang LS170 handheld colorimeter can measure the Lab and Lch values of the measured color. Six color formulas and seven color spaces can be selected. If you need other color spaces, you can set the parameters. The color cast direction are displayed, too.

Color comparison function: LS170 handheld colorimeter support QC testing function, the ΔE value can be set (0-50). If the ΔE value is within the set value, the colorimeter will display "PASS" indicating the color of the goods meet the established color standards.