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.

Qualicoat powder coating facility - Qualicoat treatment

Qualicoat Powder Coating Facilities at TD Finishing

Here at TD Finishing, as one of the country’s leading suppliers of UK powder coating systems, we are proud to provide systems that can help companies meet the Qualicoat specifications. Our powder paint systems can be installed on a wide range of business sites. We work hard to be as flexible as we can when it comes to creating bespoke paint plant solutions. We treat every client individually. Going the extra mile with our experience and expertise to install powder coating facilities that are perfect for your business and its requirements.

Related: Pretreatment Systems Decontamination


What is Qualicoat?

Qualicoat is a set of certified powder coating standards that most businesses will aim to meet. The aim of the Qualicoat Specification is to establish the minimum requirements which plant installations, organic coating materials, chemical conversion materials, processes and finished products shall meet. For the powder coating of aluminium for architectural applications, TD Finishing has supplied many pre-treatment and powder coating facilities. The pre-treatment plant and powder coating facility parameters are set out in the Qualicoat standards (15th Edition). This governs drying and curing oven temperatures, water quality, the pre-treatment testing schedule, as well as the production process and equipment inspections.


Improve quality and reduce cost

A lot of TD Finishing’s clients are looking to bring production in house. Allowing them to improve quality, reduce cost and unnecessary transport for rejected components. Bringing the control in the house can be particularly crucial for companies seeking to gain Qualicoat approval.

Two recent powder plant installations by TD Finishing included a dip pre-treatment system, as well as a power & free powder coating and curing system.  The products would be placed into baskets and manually transported through the 7-stage dip pre-treatment using an electrically driven hoist system. After the pre-treatment,  the products would be dried in the direct gas-fired wall oven.

Following drying, the products would be hung on to a flight bar at the load area of the power and & free conveyor. The flight bar is then manually manoeuvred into position at the front of the Powder booth. It is then driven through an auto powder booth and then through the single-pass direct gas-fired curing oven. Finally, the flight bar exits the oven and is driven to the bend for manual offloading once cooled. Both systems employed an Alkali Cleaner, Acid etch and the latest chrome-free treatment.


Contact TD Finishing today

To find out more about how you can achieve Qualicoat specifications, head to our website today. Alternatively, you can call 0121 520 8884 to speak to a member of our helpful and friendly team.

If you enjoyed reading this blog you may also like to read our previous article on Salt spray testing