Powder manufacturers also work with the automotive industry to refine the powder coating on plastic items such as wheel covers, rear view mirrors, door handles and air conditioning vents. In the 1960s, an electrostatic spraying application developed, in which dust particles are charged and then sprayed on a rectified material. Dust particles adhere to electrostatic attraction, then melt and heal in ovens. The electrostatic spraying process helped powder coating become an ecological, easy and affordable option for a wide variety of industries, and is still in use today. To recycle your powder, make sure that your powder spray booth is built with a recovery system. This can be very cost effective if you plan to use only one color and type of powder for your coating.
The thermoplastic variety does not undergo additional action during the cooking process because it flows to form the final coating. The distinguishing factor of this process from the other is the separation of the fusion phase before the healing phase. UV-cured powder melts within 60 to 120 seconds when it reaches a temperature of 110 ° C and 130 ° C. Once the molten coating is in this temperature window, it heals immediately when exposed to UV light Today powder coating materials are available in almost all colors and in different textures and glitter. Powdered coatings are used on hundreds of types of parts and products, including almost all metal patio furniture and most metal display shelves, shop shelves and store accessories.
Please note that you can find powder-coated aerosols available for light service applications. Safety: Safe application of the powder coating requires precautions to prevent and get breathing agent on the skin. This is an easier task to administer because the product is sturdy and inert (it does not pose a health risk when not sprayed). During application it is recommended to stay out of the scope and avoid applying it to your skin . The product does not contain harmful chemicals such as solvents or volatile organic compounds that often occur in wet paint.
Compressed air moves dust through the gun from a hopper or directly from the box where the dust is stored. Once charged, the dust cloud wraps around the part and attaches to the surface of the rectified part . The powder coating is formed with resins, pigments and other fillers that have melted and ground into a fine powder. A spray gun is used to give the particles an electrostatic charge through which they attach to a rectified metal.
Preparation is the first step in the process and perhaps the most important. This step determines how well the powder coating adheres to the metal surface and there are several options for cleaning and preparing powder coating equipment manufacturer the surface. The use of a degreaser and / or phosphate rinse is ideal, followed by a quick rinse with water. The powder is then applied with the spray gun and the curing starts immediately afterwards.
Several car manufacturers now apply transparent powder coats to liquid outer base layers and there are some powdered cars. Transparent acrylic top layers have been used in BMW and Mercedes vehicles. UV curing requires specially formulated powders that can be cured by exposure to ultraviolet light. The powder must first be exposed to sufficient heat to melt when exposed to UV energy; the initial heat source is typically infrared, but convection heating can also be used. A photographic initiator in the coating material absorbs UV energy and converts the cast film into a solid cured finish in seconds. Parts can be grouped more than with some liquid coating systems and more parts can be coated automatically.
The most common way to apply the powder coating to metal objects is to spray the powder with an electrostatic gun or crown gun. A wide variety of nozzles are available for use in electrostatic coatings. The type of mouthpiece used depends on the shape of the workpiece to be painted and the consistency of the paint. The object heats up and the powder melts into a uniform film and then cools down to a hard coating. It is also common to first heat the metal and then spray the powder on the hot substrate. Heating can help achieve a more uniform finish, but it can also cause other problems, such as runs caused by excess dust.
Wire-shaped products, such as springs and storage baskets for the home and office, are often covered with fabric. The first step in the powder coating process is to prepare or pre-treat the parts. The product to be coated is exposed to cleaning and pre-treatment operations to ensure that the surfaces to be coated are clean and free from grease, dust, oils, rust and other contaminants. Chemical pre-treatment normally takes place in a series of spraying chambers. The parts are first cleaned with an alkaline, acidic or neutral cleaner. In many cases, the surface part is treated with an iron or zinc phosphate conversion coating or a transitional metal conversion coating, such as a zirconia product.