Method for Removing PET Surface Coating

(S) Brush coating
Brush painting is an older, simpler, and more traditional manual coating method, offering ease and flexibility in application. It can coat objects of any shape, except for paints that dry quickly and have poor leveling properties. This method allows the paint to penetrate the fine pores of metal surfaces, enhancing the adhesion of the coating to the metal.

(II) Scrape Coating
Scraping is a method of applying paint using a scraper, suitable for high-viscosity, 100% solid content liquid paints. Common defects in the scraping application include cracking, peeling, and curling, and achieving an even film thickness can be challenging.

(D) Immersion Coating
Dipping and coating is also a traditional painting method. The item to be coated is immersed in a liquid bath containing the paint, then removed to allow excess paint to drip back into the bath, or to use mechanical methods to remove the excess paint. This method results in significant solvent loss, is prone to air pollution, not suitable for volatile paints, and the coating thickness is difficult to be even. It is generally used for complex structures or parts.

(Four) Dipping and coating
Flood coating involves spraying paint from nozzles onto the surface of the item to be coated, where the paint runs downward to fully cover the surface and form a film. This method uses simple equipment, is relatively easy to mechanize, and is simple to operate with high production efficiency. However, the coating may be uneven or incomplete, and achieving a uniform thickness is challenging. Flood coating consumes more solvent than immersion coating and may also pose safety and pollution issues.

(V) Spray Painting
Spraying involves using compressed air to create a vacuum at the nozzle, which propels paint from the container through the spray nozzle and immediately into a high-speed air stream. This causes the paint liquid to rapidly disperse into a fine mist, which is then evenly applied to the surface. This method requires the paint to have a low viscosity and often includes a thinner. The advantages of spraying include even coating thickness, smooth appearance, and high production efficiency. The drawbacks are higher material waste compared to brushing and flooding methods, and environmental pollution when using solvent-based paints. It is suitable for various types of paint and substrates, making it a widely used coating technique.