By Bob Utech
A consultant to High-Performance Powder Coating examines charges, functionality, and environmental results. The textual content appears at technical advances made in powder coating approaches and kit, and it explains those recommendations for these within the attempting to continue a aggressive part. Powder coating fabrics and their functionality houses are checked out in addition to electrostatic theories, curing, and ovens. The booklet seems to be at layout and building facets of the pretreatment washing machine procedure and explores tracking and holding pretreatment platforms, in addition to the basics of keeping off pretreatment failure. different issues contain apparatus hoppers and feeders, powder compartments, purposes, working stipulations, and issues of safety. functionality checking out, together with criteria and chemical resistance, are defined. moreover, troubleshooting methods while a product is off color, off gloss, or shows negative adhesion characteristics is gifted
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Extra info for A guide to high-performance powder coating
Powder manufacturers can add components to the powder-coating material to control when the reaction occurs during the curing phase. Once the powder has fully cross-linked (cured), it cannot be reflowed. Subjecting the part to proper heating and letting the powder continually flow until all cross-linking occurs is crucial to the part’s cosmetic appearance. This is particularly true of textures, veins, and other specialty powders. End users of powder coats must clearly communicate to powder manufacturers/suppliers the precise performance and appearance properties required for a specific application, such as corrosion and impact resistance, cure cycle, gloss, color, and texture.
The charge not bleeding to the ground dramatically increases the cumulative charge of the coating layer, resulting in rapid development of back ionization, significant reduction in powder transfer efficiency, and a deterioration of finish quality and uniformity. Poorly grounded parts can cause back ionization. Turning down the voltage and adjusting the amps can assist in overcoming the problem. In some cases, preheating the part allows the powder particles to fuse immediately without regard to the charge.
Frictional rubbing of the powder in long spiral tubes in the gun generates tribocharging. The powder for tribocharging must be specifically formulated for tribo equipment. The tribocharge is positive and has no “field” to pass through. Generally, deposition rates are lower for tribo guns, so more guns per line are required. Since the charging process depends on inertial forces bringing the particles in contact with the walls, and since the charge transfer is related to the relative chemical compatibility of the powder and the wall material, the process is sensitive to both the particle-size distribution and the chemistry of the powder being sprayed.
A guide to high-performance powder coating by Bob Utech