what is powder coating

Powder Coating Systems – How Does Powder Coating Work?

Here at TD Finishing, we are proud to be one of the country’s leading suppliers of powder coating equipment for sale. If your business would like to invest in such facilities, you may be looking to have those all important questions answered, to begin with. For example; ‘what is the powder coating process?’ and ‘what is a powder coating system? and how does powder coating works?‘ As highly experienced experts in powder coating systems, we’ll be able to answer all of these questions and more. Therefore, when the time is right to invest in a powder coating line, you will know exactly what to look for.

What Is Powder Coating And How Does It Work?

Powder coating is a finishing process that you apply to metal surfaces. A powder coated surface will be more resistant against corrosion, scratches, wear and tear, chipping, and fading. Especially compared to a surface that doesn’t have this advanced protective finish. It consists of a flowing, fluidised powder that is baked in a coating oven. The powder then flows as a liquid. Then, it cools to form a hard and durable finish. TD Finishing powder coating equipment is used to paint everything – from bicycles to car parts and domestic boilers to Architectural aluminium. There are usually three stages to the powder coating application.

Stage 1

The first stage involves preparing a surface for powder coating. This can be done in several ways, depending on the final finish requirements. The two most common ways are hand wiping with cleaner and shot-blasting followed by a full online pre-treatment plant. Our Pre-treatment plants work in one of two ways, an online spray for conveyorised plant or an automated dip tank with gantry system. The system will allow you to load the basket with longer or higher quantities of material. The powder coating pre-treatment cleans and prepares the surface of the substrate. It allows for good, reliable adhesion of the powder coating. TD Finishing can assist you with working out the correct pre-treatment regime for your business. This stage is followed by the use of a powder coating drying oven.

Stage 2

Once dried and cooled, the second stage involves the careful application of the powder coating. Electrostatically charged on leaving the gun, the positive (+ve) coating is attracted to the grounded substrate material. It is then held in place by the electric force. The application equipment ensures sufficient charge of the particle, as well as field strength. This prevents the powder bouncing off or falling from the substrate before curing. For fluidised beds, or fusion bonded epoxy coatings, the product needs heating during the drying stage. This is for the purpose of melting the powder into a green-cured state before moving to stage three.

Stage 3

Finally, once the substrate is fully coated, the product needs heating in the oven to the required temperature. The product then dwells until the powder has finished flowing across the surface. The times and temperatures will vary depending on certain factors. These factors include the powder, thickness or gauge of material and product weight. But, typically around 180-200 degrees for 15-30 minutes is sufficient. At this part of the process, it is vital to ensure the oven’s temperature is enough to cure all the products evenly. td have many years’ experience in powder coating equipment. We understand the importance of air movement within the oven whilst simultaneously balancing the flow. Therefore, avoiding any significant disturbance of the powder prior to jelling.  

Powder Coating Equipment for Sale

We have decades of experience as powder coating equipment manufacturers. TD Finishing supply online conveyorised powder coating systems, manual & monorail conveyors, power & free systems, standalone box ovens. We also supply infrared ovens for simple one-dimensional products, or as a pre-gel system. This prevents cross contamination during a colour change. In addition to the above, we supply equipment for wet spray systems too. No matter what type of plant you are looking for, we’ll work hard to find you the perfect solution for your requirements.

Contact us Today

For more information on our powder coating systems for sale, head to our website today. Or, call 0121 520 8884 to speak to a member of our helpful and friendly team. We’ve invested in some of the worlds best powder coating equipment so everything we deliver is top quality.

If you enjoyed reading this blog about how powder coating works, you may also like to read our previous article on powder coating plants.