By Bob Utech
A advisor to High-Performance Powder Coating examines charges, functionality, and environmental results. The textual content seems to be at technical advances made in powder coating methods and kit, and it explains those strategies for these within the attempting to hold a aggressive area. Powder coating fabrics and their functionality houses are checked out in addition to electrostatic theories, curing, and ovens. The publication appears to be like at layout and development elements of the pretreatment washing machine method and explores tracking and protecting pretreatment structures, besides the basics of fending off pretreatment failure. different subject matters contain gear hoppers and feeders, powder compartments, purposes, working stipulations, and questions of safety. functionality trying out, together with criteria and chemical resistance, are defined. additionally, troubleshooting systems while a product is off color, off gloss, or shows bad adhesion characteristics is gifted
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Additional info for A guide to high-performance powder coating
Larger particles are likely to be deposited on top of existing uncured coating. When viewing a cross-section of an uncured powder-coating layer, the bottom portion (closer to the metal) would likely have a smaller average particle size than the top portion. A powder coating may not flow well during the curing process. p65 34 4/10/02, 11:39 AM Powder Process and Electrostatic Theory Figure 4-1. Electric field between two charges. uncured coating layer. This results in lower gloss, bumpy finishes, and orange peel due to the insufficient flow properties of the powder coating (Guskov 1996).
Very high gloss and clear acrylic powders can be heat sensitive and, therefore, may need to be stored and shipped in air-conditioned environments. The advantages of using acrylic powders are: • • • • • • smooth surface, thin film-building capacity, good chemical resistance, good corrosion resistance, good mechanical properties, and excellent gloss retention. The disadvantages of using acrylic powders are: • poor mechanical properties (acrylic urethane), • higher price, • storing and shipping environments may need to be cooled, and • short shelf life.
As the positive ions produced by back ionization inside the powder-coating layer move out of the coating layer, they neutralize the charge of the powder particles adjacent to the streamer channels. The active directed motion of positive ions along streamer channels also engages air molecules, resulting in a phenomenon called electric wind. Electric wind rips powder particles neutralized by positive ions from the powder-coating layer. ” If the powder-coating material does not flow well during the curing process, craters formed by back ionization will not flow over completely, resulting in the wavy surface appearance of the cured powder coating.