Hot-melt powder coating process

hot melting application works by applying powder coating with a spray gun on preheated workpieces, using the heat of the workpiece to melt the powder coating, cooling can make the workpiece coated, if necessary, after the after-baking treatmentThe key to the control of the hot-melting processis the preheating temperature of the workpieceWhen the preheating temperature is too high, it can often lead to severe oxidation of the metal surface, a decrease in coating adhesion, and even may cause the degradation of powder coatings and the foaming discoloration of the coatingThe warm-up temperature is too lowThe paint is illiquid and does not have easy uniform coatingWhen applying PVC, high density polyethylene, polyamide 1010 and oxidizing polyether four end-of-the-line coatings, the workpiece preheatshot-melt coating method is often not able to obtain the required thickness, therefore, to repeatedly spray many times, after each spray needs to be heated treatment, so that the coating completely melted, lit, and then sprayed the second layerThis not only makes the coating uniform and smooth, but also significantly improves the mechanical strengthHigh-density polyethylene heat treatment temperature is about 170 degrees C, chlorinated polyether is about 200 degrees C, the time is appropriate for 1 hourhot-melt coating method obtained by high quality, beautiful, high bonding force, powder coating loss is small, easy to control, less odor, its spray gun without combustion system, simple structure, can use ordinary spray spray gun