By Bob Utech
A consultant to High-Performance Powder Coating examines bills, functionality, and environmental results. The textual content seems at technical advances made in powder coating approaches and kit, and it explains those suggestions for these within the attempting to retain a aggressive facet. Powder coating fabrics and their functionality homes are checked out besides electrostatic theories, curing, and ovens. The booklet appears to be like at layout and building points of the pretreatment washing machine method and explores tracking and retaining pretreatment structures, in addition to the basics of heading off pretreatment failure. different issues comprise gear hoppers and feeders, powder cubicles, purposes, working stipulations, and questions of safety. functionality checking out, together with criteria and chemical resistance, are defined. moreover, troubleshooting techniques whilst a product is off color, off gloss, or indicates bad adhesion features is gifted
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In an internal gun, the charging process is the same as in an external gun. However, while the charging electrode is referenced to the grounded part to form the corona in an external gun, the internal charge carries its own ground reference internally. Little or no external field forces and excess ion current result. Internal charging corona guns tend to require more frequent maintenance than other guns. It is necessary to keep their ground reference clean and free of powder, due to their complex and often fragile components.
They remain free in the space between the gun and grounded part and travel toward the closest ground along the field lines. BACK IONIZATION, FINISH QUALITY, AND TRANSFER EFFICIENCY Back ionization is probably the painter’s worst application problem. When a painter attempts to apply powder into recessed areas, the charged powder particles tend to attach themselves to the closest ground. Unfortunately, the closest ground is not usually where the painter wants the powder to be applied. p65 35 4/10/02, 11:39 AM A Guide to High-performance Powder Coating ization is also a major cause of what is termed the “self-limiting” property of powder coating, because it greatly reduces transfer efficiency.
Powder particles do not capture these free ions. They remain free in the space between the gun and grounded part and travel toward the closest ground along the field lines. BACK IONIZATION, FINISH QUALITY, AND TRANSFER EFFICIENCY Back ionization is probably the painter’s worst application problem. When a painter attempts to apply powder into recessed areas, the charged powder particles tend to attach themselves to the closest ground. Unfortunately, the closest ground is not usually where the painter wants the powder to be applied.
A guide to high-performance powder coating by Bob Utech