When the inorganic powder is applied onto metal, it is referred to as powder coating. After heat is applied you end up with a smooth hard outer skin finishing. All processes are applied under controlled and stable conditions. This results in significant benefits over traditional wet paint. Here is more information on these industrial powder coating equipment.
Steps involved in this painting process
At first, the product has to undergo sandblasting right after its fabrication. The purpose of this tedious procedure is to remove any traces of rust, oil or mill scale which are common on manufactured steel. As for those products that are undergoing repainting, sandblasting removes the old coating. There are different materials used when sandblasting, some simple as walnut shells to the more industrial steel grit. Most of these mediums can be used for a number of times before eventually being disposed of. The sandblasting process strips the oxidation layer off steel resulting in rust in a matter of hours after its exposure to atmospheric conditions. Retaining this in mind, it is very important for the products to remain concealed within the dry environment.
The second phase involves the Application of powder. In most cases, a zinc-based primer is applied accordingly using special corona or electrostatic guns. The gun applies a positive charge to the powder when discharged from the gun. The positively charged powder particles negatively attach themselves to the workpiece. This brings about two distinct results throughout the process. First, the powder coat remains thick in the target area, resulting in a dense positive charge that repels the powder preventing it from thickening. If the spray is applied to a thick area indiscriminately, the positive charges will repel the ongoing powder application.
After the powder is applied to the piece being worked on, the next step is to relocate the powder coating bay to the oven where heat is applied to gel the primer. It is important to exercise maximum precaution when moving the product around otherwise the powder will not adhere to the workpiece. Bumping or touching the workpiece with too much force results in a defective finishing. The workpiece can they remain in the oven for a period that depends on the heated volume of steel.
After being gelled and heated up, the product is then moved to the powder coating area where the final finish coat is applied. A color that is customer friendly will have to be coated. The final stage is baking the product in the oven and having it ready for the manufacturing process.
Demerits of powder coating
It would only be fair if some of the contentious areas with this technique are mentioned. These are mainly, difficulty in matching metallic colors, huge initial costs involved, and inability to paint on rubber surfaces. Nevertheless, most of this challenges can be overcome through proper engineering and design. When designing your project carefully visualize it using 3D model technology to ensure there are no gray areas that might pose a challenge to powder coating. Engineers who are experienced and familiar with the final assembly can maneuver through such hurdles and ease the work.