For a range of different applications, powder coating is the best option if you want to give something an attractive, hard-wearing coating. It’s used in a wide range of industries including architecture, aerospace and automotive, building and construction, coach building, flooring, gaming machine manufacture and fabrication and a whole lot more. Edmo Limited, are experts in this process and offers its service in a wide range of colours and finishes.
What is powder coating?
It’s a process for applying a type of coating. It can be either a thermoplastic or a thermoset polymer. The coating is applied as a dry powder which is free flowing. Conventional paint is very different from this type of application, because it requires a solvent to keep the paint in a liquid form in order to be applied. Powder coating requires no such thing. It is applied electrostatically, and has to be cured under heat as this allows it to flow and form a skin.
Powder coating creates a hard finish that is more durable that conventional paint. It is traditionally used to coat metals, as in household appliances, automotive and bicycle parts. Recent improvements in the technology now allow for a wider range of materials to be powder coated, such as MDF (medium-density fibreboard).
A tribo gun is another way of powder coating. This charges the powder by friction. Applying the powder using specially adapted electrostatic discs is another type of powder coating process. Fluidized bed method is another type of process and involves dipping an object into an aerated, powder-filled bed.
The powder coating process
Generally, powder coating is applied to metal objects using an electrostatic gun, known as a corona gun. A positive electric charge is given to the powder by the gun, and this is then sprayed towards the object being covered by mechanical or compressed air. A powerful electrostatic charge further accelerates the powder towards the object. The object then gets heats and the powder melts uniformally. When the melted powder cools it forms a hard coating. Commonly, metal objects will be heated before being sprayed as this helps create a more uniform finish.
Why is powder coating better?
There are a number of reasons why you might want to take advantage of powder coating. The biggest is that the process allows a thicker coating to be applied, without any running or sagging. It also produces far fewer volatile organic compounds (VOC), making it more environmentally friendly. The process allows for the application of several powder colours before curing, which means colour blending and bleed special effects can be together in one layer. Powder coating has a much faster curing time, which means jobs can be done much quicker.