Why Powder Coat?
Powder Coating is a metal coating and finishing process that is used to achieve Decorative value—with color, gloss, and texture—and Functional value by protecting from corrosion and abrasion—and helping maintain value.
Powder Coating provides a green, environmentally friendly process that does not include Volatile Organic Compounds (VOC) or use hazardous materials. The process creates a very tough surface for abrasion resistance, corrosion (rust) resistance delivered a low cost.
How Does Powder Coating Work?
Powder coating, also referred to as “dry powder paint”, is a completely solvent free system that uses a combination of microscopic organic and inorganic pigment solids, fillers, resins, and hardeners that are applied by spraying a dynamic mixture of air andpowder via a specially designed, electrically charged nozzle onto an electrically grounded target substrate.
The electrostatic differential between the powder and the part causes the powder suspension to “cling” to any exposed part surfaces. The parts are then placed into a curing oven that reflows (melts) the microscopic powder into a thixotropic fluid that then cures into a physically durable and aesthetically attractive finish.
6 Step Process
Step 1 – Hanging
Parts are placed on metal racks and hangers that suspend the parts on the conveyor.
The parts must make electrical contact with the hangers.
The system is grounded to earth.
Step 2 – Pretreatment
Cleaned in Iron Phosphate and DI Water.
Under pressure and temp in the automated washing section of the conveyor line.
Step 3 – Drying
Dries any residual fluid from the cleaning stations.
Completely dried parts are sent to the next line station for coating.
Step 4 – Powder Coating
Dry powder coating system applies pigment and fillers.
Manual and automated electrostatic gun application.
Step 5 – Curing
Parts convey through an IR convection oven.
Temp is typ. 400-410 °F.
Rate is 4-8 FPM.
Dwell time is typically 15-18 min.
Step 6 – Cooling/Packaging
Iron Phosphate and DI Water.
Under pressure and temp in the automated washing section of the conveyor line.
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