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What are the common causes of quality defects in color coated sheets

Update:14-11-2020
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What are the common causes of quality defects in color […]

What are the common causes of quality defects in color coated sheets

Color coated steel plate is also called pre-coated steel plate. It is based on metal strip steel (such as cold-rolled steel plate, galvanized sheet, aluminum plate, etc.), and through strict process control, various polymer coatings (such as polyester, silicon-to-polyester, partial Products made of polyvinyl fluoride resin, polyvinyl chloride, acrylic resin, epoxy resin, etc.) or pasted with various plastic films (such as polyvinyl chloride film, polyethylene film, etc.). The combination of the physical and chemical properties of the color-coated plate product and the surface quality of the coating determines the overall quality of the color-coated plate product.

1 surface scratches

Surface scratches are a kind of product surface defects during the production of china Coated sheet. It not only affects the appearance of color-coated products, but also reduces the corrosion resistance of scratched color-coated products. It can be divided into raw material scratches and production process scratches according to the source.

2 Missing coating

Missing coating refers to a quality defect caused by the steel plate not being coated with paint by the coating machine during the production process of color-coated panels. It is one of the most common product quality defects in the production of color-coated panels. It not only directly affects the color It also affects the appearance of color-coated products, and affects the performance of color-coated board products. It also reduces the corrosion resistance of color-coated board products and loses the characteristics of color-coated board products. Therefore, we must be aware of leakage during the production process. The reason for coating, so that the most effective measures can be taken to prevent and control the occurrence of missing coating defects.

3 color difference

Chromatic aberration refers to the comprehensive difference of the hue, saturation and brightness of the color coated board. Chromatic aberration is one of the most common quality defects in the production of light-colored coated plates, and it is also one of the most difficult to control quality defects in the production process of color coated plates. The generation of chromatic aberration is related to the use of paint, equipment adjustment and operation control, etc. The factors are all related.

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