How to Ensure Quality of Prepainted Aluminum Coil

The prepainted aluminum coil refers to aluminum coils that are coated with one or several layers of organic coatings such as polyester and fluorocarbon polyester after surface processing, and then baked and cured. There are usually two kinds of paintings: PVDF and PE.

Compared with polyester (PE) coating aluminum coil, fluorocarbon (PVDF) coating aluminum coil has the advantage of long service life. Generally, the service life of PVDF coated aluminum coil can reach more than 20 years while the service life of polyester color-coated aluminum coil is usually about 10 years.

Fluorocarbon color-coated aluminum coil is a product that uses high-quality fluorocarbon paint to coat the surface of aluminum coil. Fluorocarbon paint has better weather resistance and longer service life, and is the first choice for color-coated aluminum coils for outdoor products.

The general production process of coil coating has 5 steps, namely coil input, cleaning and chemical treatment, painting, curing and finished product output. The process layout and equipment composition are different in different cases, but the basic parts are the same.

The quality of the pretreatment (cleaning and chemical coating) determines the quality of the coating and directly affects the flexibility and impact resistance of the coating. It determines the coating adhesion of aluminum trim coil.

The purpose of initial coating, finishing coating and curing is to coat the coating on the surface of the substrate, and volatilize the organic solvent of the coating by heating, so that the organic coating and the substrate are closely combined. Coating and curing directly affect the appearance quality and physical and chemical properties of color-coated aluminum coils, which are the key links in production control.

Aluminum trim coils may have color difference during production and use. Since color difference is affected by various factors such as production batch, color depth, use time, use environment, and purpose, it is usually negotiated by both the supplier and the buyer when ordering.

Coating durability is the performance of the color-coated aluminum coil during use, and it is usually measured by the length of service life. Coating durability is mainly affected by factors such as coating type, coating thickness, and environmental corrosion. coating type, coating thickness, and environmental corrosion. The true durability of coatings can be determined by atmospheric exposure testing or artificial aging tests.