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Fluidized bed coating is the process of creating a fluidized bed with a fluidizer. Following their insertion into the fluidized bed, the material particles come into contact with the heated element, reaching the melting point of the material and forming a homogeneous coating.
Before applying the coating, we start by preparing the surface of the product so that coating can be applied. In our case it is a wire shelf. In order to achieve the desired coating result, the metal surfaces must be properly prepared and cleaned. This allows to get rid of all chips or dust that could negatively impact the coating applied in the process. This allows to ensuring that the element that is to receive the coating using the fluidized bed is clean and ready for further stages.
We heat the material up to the melting point of the shelf, which depends on the material and size of the shelf. We always select temperature necessary to reach the melting point of the material based on the product requirements. It is very important that the temperature is appropriate because this determines what coating may be obtained using the fluidized bed. Obviously we want to obtain a homogeneous structure of the coating and appropriate thickness.
This process involves creating a fluidized bed from powder coating and inserting the element into it. This is the most characteristic stage of the metal powder coating process. We may call it dip powder coating. We put powder in a device called the fluidizer and create the fluidized bed. The air makes the material particles move throughout the entire vessel volume. This looks very similar to boiling water but it is still powder. We dip the element, which comes into contact with the heated element, sticks to the surface and melts with it, creating a plastic coating. Applying a powder coating allows us to obtain a coating that binds perfectly with the element.
After removing the products from the fluidizer, the element is heated again to ensure that the surface of the coating and its entire structure hardens. This time it is performed at a lower temperature than with the first heating. A high temperature makes the material layers bind even better to the powder coating. This allows for both the right and the left side of the shelf to be homogeneous and the powder coating material is applied evenly on the metal. The powder coating is still soft immediately after taking the shelf out of the oven. The powder hardens as it cools down, at 15–20°C. The whole powder coating application process takes between a few and a dozen or so minutes.
The finished products are thoroughly inspected and the final stage is preparing the products to be shipped.
Fluidized bed coating causes the metal to obtain some plastic properties – the coating is flexible, resistant to impact and durable.
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