Powder coating machines apply protective coatings to metal parts using positively charged powder and electrostatic methods, creating a better bond than liquid paint. There are several types of machines, with spray types being the most popular. Corona and tribo spray guns are commonly used, with the former using a high voltage generator and the latter using compressed air to bond the powder to the metal surface. The coated part is often heated to complete the bonding and curing process.
A powder coating machine is a device that applies protective coatings to metal parts similar in finish to conventional liquid paint. The main difference between the two processes is the method by which the coating is applied. In the case of powder coating, a stream of positively charged powder is applied to a grounded or negatively charged metal surface. This electrostatic method creates a better bond between the coating and the metal than is possible with conventional paints, as well as offering many other benefits not possible with liquid coatings. There are several types of powder coating machines in general use, the most common being the corona and tribo spray gun variants.
Powder coating is the process of coating metal objects with layers of powdered thermoplastic or thermosetting polymer. The process is an efficient and highly effective method of coating a wide variety of consumer products ranging from household appliances to patio furniture. These finishes are applied with different types of powder coating machines including spray, electrostatic disc, electrostatic magnetic brush and fluid bed systems. Of these, spray types are the most popular in most commercial applications. Corona and tribo spray painting machines are the most commonly used.
The corona gun powder coating machine consists of a powder dispenser, a high voltage generator, a corona spray gun with powder feed hoses and a negative or ground connection. To operate the corona gun system, the ground connection is connected to the workpiece and the suitable powder coating material is loaded into the machine’s dispenser. The high voltage generator excites an electrode in the gun, thereby imparting a powerful positive charge into the powder and creating a high-energy electric field between it and the workpiece. This electric field acts as a motivating agent that draws the positively charged powder to the surface of the workpiece. Upon contact, the powder coating bonds to the metal surface, thus forming a uniform layer.
The tribo-type powder coating machine also relies on an electric field to bond the powder to the metal surface, but uses compressed air to carry it through a Teflon® tube and nozzle to the workpiece. The positive electrical charge in the powder is imparted by friction between it and the Teflon® tube surface and bonds the powder layer to the metal in the same manner as the corona gun method. After coating with either system, the part is often heated to allow the plastic coating to spread more evenly and complete the bonding and curing process.
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