1. Recyclability of
Metal Powder Coatings
As for the powder produced by the dry mixing method, due to the separation phenomenon during the spraying and recycling process, the recycled powder and the new powder will have a certain difference in the metal pigment content, which may lead to a different appearance of the coating film and a color cast phenomenon. . This is due to the difference in properties between metallic pigments and powder particles.
Experts advocate a ratio of recycled powder to virgin powder of at least 1:4. If the powder coating produced by the bonding method is used, since the ratio between the metallic pigment and the powder particles is relatively fixed, the recycled powder can be completely reused.
2. Overcoat layer of
metal powder coating
Re-spraying an overcoat on the metal powder coating has the following benefits: enhancing the stone-cutting performance of the metal powder coating; adding a beautiful effect to the metal powder coating; of weather resistance. In order to ensure the appearance of the overcoat layer, it is required that the workpieces that have been sprayed for the first time should not suffer any contamination. Therefore, a fully automated spraying line and two independent spray booths are generally required for separate painting. It is recommended that under normal circumstances do not spray the overcoat layer. It is only used when the requirements are very high, such as: high-end appliances, car wheels, and outdoor use (to ensure weather resistance).
3. Erasability of metallic pigments
Neither dry-blending nor adhesive-fixing powders can fully address the wipe-off problem of metallic pigments. The only way to deal with scratch off is to spray a clear coat on the metal powder coat film.
