Pölypinnoitus

Pölypinnoitus, also known as powder coating, is a dry finishing process that uses finely ground particles of pigment and resin. It is applied electrostatically to the surface of a product, which then moves through a curing oven. The heat causes the powder to melt and flow, creating a smooth, durable, and uniform coating. This method is widely used for coating metals, and it offers several advantages over conventional liquid coatings.

The powder coating process begins with the preparation of the surface to be coated. This typically involves cleaning and degreasing to remove any contaminants that could affect adhesion. Next, the powder, which is electrostatically charged, is sprayed onto the product using a specialized spray gun. The electrostatic charge causes the powder particles to be attracted to the grounded workpiece, ensuring even coverage. After coating, the product is heated in an oven, typically between 150-200 degrees Celsius. During this curing phase, the powder particles melt, fuse together, and react to form a continuous, protective film.

Powder coating provides a high-quality finish that is more resistant to chipping, scratching, and fading than many liquid coatings. It is also environmentally friendly, as it contains no volatile organic compounds (VOCs) and excess powder can often be reclaimed and reused, minimizing waste. The process allows for a wide range of colors, textures, and finishes, making it a versatile choice for various applications including automotive parts, appliances, furniture, and architectural elements. The durability and aesthetic appeal make it a popular choice for both functional and decorative purposes.