Powder electrostatics applications

In recent years increasing use has been made by many manufacturers, who require a limited range of colours, of the electrostatic application of a dry powder spray. Dry electrostatic finishes are fused at temperatures in the same range as conventional ones. 

Peart, J. Powder electrostatics theory, techniques, and applications. Kona 2001,19, 34-4-5. 

Peart J. Powder electrostatics Theory, techniques and applications. KONA Powder Particle 2001 19 34-45. 

A number of variants are possible in two-layer-single stoving coatings, depending on whether the layers are applied wet or dry via electrostatic application of powder (see Section 5.4.5.2). 

Frit may be milled dry or wet. The long established dry process is used for cast iron baths and for chemical plant. Vitreous enamel application by a dry electrostatic method is being used on an increasing scale. In these cases, the frit is milled alone, or with inorganic colouring or refractory additives. This is achieved in cylinders using balls of porcelain, steatite or more dense alumina, or with pebbles of flint, to produce a fine powder of predetermined size. 

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