Powder coatings are based on polymer resin systems, combined with hardeners, pigments, fillers, and additives.
There are four stages in the production of powder coatings.
- Pre-weighing (premixing) - this involves the weighing and mixing of all the raw materials in the formulation.
- Extrusion - this involves the powder being heated up, which melt the resin and hardeners. The consistency of the powder changes to a viscous form.
- Cooling - Then it's cooled, which hardens the mixture and turns it into a sheet at cooling belt. This sheet is then breaked down 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.
Click to enlarge picture