Metal Finishing Guide Book


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Many states, such as California, now mandate that you use either HVL Por electrostatic technology to qualify for a permit to install a new spray booth. A manufacturing facility is permitted to emit a specified amount of VOCs (in tons) per year. If the tonnage limit is exceeded, strict fines are enforced. These fines can easily exceed thousands of dollars. As a result of these laws many companies have invested in electrostatic finishing equipment to comply with VOC regulation. Decreased Maintenance Costs As stated earlier, when transfer efficiency increases, the amount of overspray deposited into the spray booth decreases. This means spray booths that previously required weekly cleanings and filter changes may now require biweekly maintenance. Waterwash booths that previously consumed 55 gallons of chemicals in one month may now use only 30 gallons. Not only is the cost to purchase these materials reduced, but the cost to dispose of them is decreased as well. Dirty booth filters and contaminated booth water must typically be disposed of as hazardous waste. In recent years, the cost associated with the disposal of hazardous waste has sky rocketed. Not only is there a direct cost reduction, such as filters, chemicals and disposal (see Table III), there is also an indirect savings in labor cost, due to the fact that booth maintenance can easily consume on an average up to 8 man-hours per week. Better Coverage/Improved Quality Electrostatic finishing has many other benefits in addition to cost savings. Application time may be reduced with the aid of electrostatic wrap. Electrically charged paint particles can change direction and be deposited on the top, bottom, and sides of the part when sprayed from one direction. Depending on part size and configuration this wrap-around may sufficiently coat all of the product at once, eliminating the need for additional passes. When using a nonelectrostatic gun you must point the gun at every area that requires paint, if you miss a particular angle it will not be painted. With electrostatic applicators, the wrap-around may coat these areas producing a more uniform finished product. As a result of a more uniform finish, many manufacturing facilities have experienced a lower reject rate in their production. In the case of on-site furniture refinishers or appliance refurbishers,it would be virtually impossible to paint without electrostatic finishing equipment. 196

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