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Powder Coating

Producing different kinds of products often require different kinds of paint on the surface. Some substances may be abrasive and require a special kind of coating; on the other hand others may be fit to handle a normal paint can or spray painting. The type of coating that is used is often based on the surface texture of the product.

During the production of metal, it is not uncommon for manufacturers to use powder coating. The powder coating process is more environmentally friendly than regular painting and it offers a larger range of advantages compared to common coatings. When considering the buying of a product that has been powder coated it is important to know what the process entails in order to make an informed decision.

Equipment used during powder coating

The main tool that will be used during the powder coating process will be the powder coating spray guns. These guns are specially formulated to be charged with a powerful electrostatic force which will then aide in releasing the paint from its nozzle. There are a wide variety of nozzles available for electrostatic coating and the type of nozzle will depend on the shape of the product that will be coated as well as the consistency of the paint itself.

Different types of powder coating

There are two different types of powder coating, namely thermosetting and thermoplastic. The only difference between these two is the addition of a crosslinker during the thermosetting process. This then undergoes additional reactions while the powder is baked, and increases the overall qualities of the powder coating.

How powder coating is done

There are 3 steps involved during the powder coating process namely the pre-treatment, the powder application, and the curing.

• Pre-treatment: before the powder is applied to the product the surface must be cleaned. Any unnecessary debris, dirt, or oil can be removed either by chemical or mechanical processes. The process chosen will depend on the size and material of the product that will be coated, as well as the type of soil or dirt that has to be removed.

• The Powder Application: after the cleaning process the powder is sprayed onto the material by using the powder coating spray gun, also called the Corona. The gun enforces a positive charge on the powder which is then sprayed onto the object. The object will then be heated which will cause the powder to melt in a uniform film before it is cooled.

• Curing: after the powder application process curing takes place. The powders need to cure under a certain temperature in order for it to be established as a full, uniformed film.

Advantages of powder coating

The advantages of powder coating outweigh that of regular painting, to name but a few. They are environmentally friendly as it is 100% recyclable. They are able to produce thicker coatings that will prevent the coating from running or sagging. When choosing powder coating as an option the capital costs are less than when using conventional liquid lines.
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