Powder Coating Jason Fox Material Science Meen 3344.

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Presentation transcript:

Powder Coating Jason Fox Material Science Meen 3344

Powder coating is a finishing technology where a decorative and highly protective coating can be applied to a wide range of products. The process involves spraying finely ground, electro-statically charged particles of pigment and resin onto a surface to be coated. The charged powder particles adhere to the electrically grounded surfaces and then are heated and fused into a smooth coating in a curing oven. What is it:

What does Powder Coating Offer Superior Appearance Mechanical Resistance Properties Corrosion Resistance Solvent Resistance Highly durable: chip, scratch, fade and wear resistant Ready to use and require no mixing, Solvents, or catalysts

Liquid Finishes Vs. Powder Coating Solvents Necessitate venting, filtering, and solvent recovery systems that is not necessary in powder coating. Liquid Spray Coating achieve material usage of 20-85% while powder coating has a Material usage of 95-98% Liquid overspray is lost in filters while 99% of Powder overspray is collected and reused

Powder Types Thermoplastic : Powder melts and flows to form a film. Continues to have the same chemical composition when it solidifies Will re-melt when heated. Thick coating surface and not in same market as liquid paint. Examples  Polyethylene  Polypropylene  PVC Thermoset : Powder melt flow and cross-link chemically to products Cured coatings have different chemical structures than the basic resigns. Will not re-melt when reheated Can produce thin paint like coating of – inch thick. Examples  Epoxy  Hydroxyl polyester (urethane)  Acrylic Urethane

Process

References Users Guide to Powder Coating, 4th Edition, Editor Nicholas Liberto