Influencing factors and control methods of coating thickness of color coated aluminum coil

Paint thickness of color coated aluminum roll
The coating thickness of color coated aluminum coil is one of the important factors affecting its performance and quality. Painting thickness is too large or too small will lead to color coated aluminum coil defects and problems. Excessive coating thickness will increase the cost, reduce the hardness and flexibility of the coating, affect the adhesion and corrosion resistance of the coating, easy to produce flow hanging, wrinkles, bubbles and other defects. Paint thickness is too small will reduce the coating coverage and hiding power, affect the color and luster of the coating, easy to produce scratches, wear, peeling and other defects.
Influencing factors and control methods of coating thickness of color coated aluminum coil
Therefore, controlling the coating thickness of color coated aluminum coil is the key link to ensure its quality and performance. The coating thickness of color coated aluminum coil is affected by many factors, mainly in the following aspects:
Quality of raw materials and surface treatment
The quality of raw materials and surface treatment directly affect the adhesion and smoothness of coating and substrate. Raw materials should be selected appropriate alloy series, hardness, thickness and other parameters, and cleaning, pretreatment, initial (fine) coating and other processes, in order to improve corrosion resistance and adhesion to the upper paint film.
Types and properties of coatings
Different types and properties of coatings for coating thickness requirements are also different. Usually according to the classification of coatings used to make organic coatings, there are PVC coated aluminum coil, polyester coated aluminum coil, acrylic coated aluminum coil, fluorocarbon coated aluminum coil, silicon polyester coated aluminum coil, etc. Fluorocarbon coated aluminum coil is the highest grade of products, with the best weather resistance and UV resistance, but also requires a higher coating thickness, generally more than 25 microns.
Coating process and equipment
Different coating processes and equipment have different control accuracy for coating thickness. According to different coating methods, there are roll coating, spraying, powder method, film method, printing method of organic coated aluminum coil 4. The roller coating method is the most commonly used method, which distributes the preconditioned paint evenly on the substrate through the roller, and forms a continuous and uniform paint film through baking and curing. Roll shape, size, speed, clearance and other parameters will affect the number and distribution of roller coating, thus affecting the final product coating thickness.
summarize
To sum up, the coating thickness of color coated aluminum coil is a complex and important issue, which needs to be comprehensively considered according to the use of products, performance requirements, cost control and other factors, and take corresponding measures to monitor and adjust. In general, the standard paint thickness range for color coated aluminum rolls is 15-25 microns.