Process Flow of Electrostatic Powder Coating

1. Pretreatment: Purpose: To remove oil, dirt, and rust from the workpiece surface, and to generate a layer of "phosphate coating" on the surface that is anti-corrosive and enhances the adhesion of the coating. Main process steps: degreasing, rust removal, phosphatization, and passivation. After pretreatment, the workpiece not only lacks oil, rust, and dust on its surface but also forms a uniform and rough gray phosphate film on its originally silver-white, shiny surface. This film is resistant to rust and also increases the adhesion of the plastic coating.

2. Electrostatic Coating Purpose: To evenly apply powder coatings to the surface of workpieces. Special workpieces (including those with locations prone to electrostatic shielding) should be coated using high-performance electrostatic spray machines. Process Steps: Utilize the principle of electrostatic attraction to evenly spray a layer of powder coating onto the surface of the workpiece; the fallen powder is collected through a recycling system and can be reused after screening.

3. High-Temperature Curing Purpose: To heat the powder coating on the workpiece surface to the specified temperature and maintain it for a certain period to melt, level, and cure, thereby achieving the desired surface effect of the workpiece. Process Steps: Push the coated workpiece into the curing oven, heat it to the predetermined temperature (usually 185 degrees), and maintain it for the required time (15 minutes); after opening the oven, cool it to obtain the finished product. Tip: Heating and control system (including electric heating, oil, gas, coal, and other heating methods) + Insulated chamber = Curing Oven.

4. Decorative Treatment: Purpose: To achieve a special appearance effect on the workpiece after electrostatic powder coating, such as various wood grain, pattern, and glossy finishes. Process Steps: Coating; transfer printing, etc. Spray painting, also known as electrostatic powder coating, utilizes a static generator to charge the plastic powder, which then adheres to the iron plate surface. After that, the powder is melted and bonded to the metal surface through baking at 180-200°C. Spray painted products are commonly used for indoor cabinets, with finishes that present a flat or matte effect.