What is Powder Coating?
Powder coating is an alternative to liquid paint. As its name suggests, it’s delivered in powdered form. It’s applied to the surface of an object—for example, a tire rim—by spraying it, then charging it with an electrostatic charge. This process binds the powder to the object, forming a coating. It’s similar to spraying paint from a gun, but charging powder is more efficient and creating a finish of a higher-quality than traditional paint.
After the object is powder coated, it’s heated in ovens specifically designed to cure powder coating. Once finished, the powder forms a shell—some call it a skin—that adheres to the object. Since powder coating is often of a higher quality than traditional liquid paint, it might endure more dings without cracking or chipping. The end result produces a durable and high-quality finish you can use on a variety of products, objects, or surfaces.
Quick demo of powder coating process:
Different Types of Powder Coating Equipment
Powder Coating Oven – Powder coating ovens come in three varieties: gas, electric, or infrared. The size and kind of oven you need depends on the projects you’re likely to tackle. Electric ovens are typically cheaper to operate. Gas ovens, which require propane, can increase the operating costs as the size of the project increases. If you’re working on smaller objects, which takes less curing time, electric ovens are probably a better fit for your needs.
Ovens can range in price, from inexpensive to costly. Although your budget might not allow for it, it’s important to consider that cheap ovens are often building using inefficient burners, which can raise your operating costs. Shelling out for more expensive and quality ovens might save you money in the long run.
Powder Coating Gun – Like traditional liquid paint, powder coating is applied to an object manually using a gun. The difference between a traditional paint gun and a powder coating gun, however, is that the powder coating gun charging particles as it sprays the powder. These charges are crucial to altering the composition of the powder. Without an electrostatic charge, the powder will never coat the object. Curing powder alone won’t affect the desired results.
Using a powder coating gun requires education and knowledge. It’s not something you can plug in and use without experience. Since the gun uses kilovolts to charge the particles, you must understand the number of kilovolts which coat on which object requires.
Powder Spray Booth – Every person or business offering powder coating requires a spray booth. These come in a variety of shapes and sizes. They use filters, and the quality of these filters can affect the performance of the powder coating. Cheap filters might seem appealing because of their initial cost savings, but in the long run, they aren’t as efficient at filtering material. The result of using cheap filters, or of not changing filters often enough, could affect the distribution of the powder as you apply it to an object. In a worst-case scenario, cheap or infrequently changed filters could damage the booth itself beyond repair.
Powder Spray Walls – Spray walls are usually made of steel and should be at least 18 gauge. Thicker walls might even be better. These walls ensure the work is contained. They usually include vents built into the walls to increase ventilation. Depending on the manufacturer, some walls include lighting built into the walls themselves, although most enclosures mount lighting on the ceiling.
In addition to steel, spray walls also come in the form of plastic. Plastic can offer advantages by allowing extra light into the work area. The biggest advantage they offer, however, is they made cleaning the walls easier than traditional steel walls.
Blast Rooms – Before you apply powder coating to any object, you must prepare the surface for the coating. This usually entails blasting the surface to remove paint, other material or solvents, and rust. Blasting is crucial to ensure a flawless finished product. This is simply a step you can’t avoid.
Some manufacturers produce enclosure specifically designed to handle the intensity of blasting objects. If you’re rebuilding, remodeling, or increasing the size of your facilities, you should consider adding a blast room enclosure. These are important to ensure you filter the removed particles and vent the area to ensure you’re not inhaling potentially dangerous particles or chemicals.
Pre-Treatment Enclosures – Professionals use these enclosures to thoroughly wash objects before the final stage of powder coating. These enclosures typically use high powered washers in wash bays to ensure the object is cleaned. Completely washing and cleaning an object removes an objects or debris you may have overlooked. Such thorough treatment might increase the flawlessness of the product when the powder coating is cured.
There’s nothing worse than expending time and effort to powder coat an object only to discover imperfections as a result of cutting corners or not thoroughly blasting or washing the object. This step is important to completing a professional and flawless job.