Chromatic aberration
Pre Painted Steel Coil are produced in large batches of concentrated coating products, so the coatings are also in large batches. Therefore, the surface color of the produced color-coated steel plates will be different due to different batches or different manufacturers of coatings and the same batch of coatings but uneven stirring. This is very unfavorable for mass use, especially for architectural decoration. Therefore, the color difference of the color-coated steel coils must be as small as possible or within the allowable range.
Film thickness
For Pre Painted Steel Coil The organic coating film plays a decorative role and a protective role for the substrate. Therefore, as an organic coating, it needs to have a certain thickness to have sufficient protection ability and have a sure long life. Generally, the thickness of the coating film is required to be 15-25um.
Surface gloss
The surface becomes glossy when the liquid coating is cured to form a film. The gloss of the coating film is related to the coating used. Different uses have different requirements for the gloss of the coating film. Different paints also have different glosses, such as polyester. Acrylic paint has a higher gloss, while vinyl paint, especially plastisol and its embossed, printed products, have a lower gloss. When in use, sometimes it is not desirable to have strong dazzling reflections for building interiors, ship interior walls, and decorations, while others wish to have good luster.
Hardness
In processing and using the coated sheet, the organic coating film is often subjected to the effects of pressing, scratching, grinding, and rubbing. Under the action of these external forces, to ensure that the surface film is not damaged, the surface film is required to have a specific hardness. The higher the hardness, the better the integrity of the protective film in use, but the increase in hardness will lead to a decrease in toughness. Therefore, hardness and toughness can only be balanced within a specific range. Therefore, one hardness and flexibility are selected as the required primary performance according to the application, or an appropriate index is used as the requirement for the hardness performance of the product.