How is powder coating produced?
So how are the ingredients put together to make a coating?
There are three stages in the production of powder coatings.
- Pre-weighing (premixing) – this involves the weighing and mixing of all the raw materials mentioned.
- Extrusion – this involves the powder being heated up, which activates the resin and hardeners. The consistency of the powder changes to a liquid. Then it's cooled, which hardens the mixture and turns it into a sheet. This sheet is then smashed up into small chips.
- Micronising – the big powder chips are then fed into a grinding machine, which grinds the chips down into a fine powder. This powder is then sieved to make sure no large particles contaminate the powder.