Paints and Coatings - P2 InfoHouse
Paints and Coatings - P2 InfoHouse
Paints and Coatings - P2 InfoHouse
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136 Peints & CoaUngs<br />
Figure 6<br />
Pressure Atomized Spray Painting<br />
In a/r/ess spray painting, paint is fotced through the nozzle at high<br />
enough pressure to prop/ the paint forward.<br />
Soume: Calculalkms of PahUng Wasteloads Asdated wilt, Metal Fldshhg, US. Environmental Rotecticm<br />
Agency, June 1980.<br />
Figure 7<br />
Electrostatic Spray Painting<br />
. . :<br />
a<br />
.. ’.. .* ::.<br />
The obwt to be painted 1s grounded <strong>and</strong> the paint is given the opposite<br />
charge. Overspray is greatly reduced because the paint is attracted to the<br />
opposite charge on the object being painted.<br />
Source: ca/cu/at&m dPclhUnp Wasteloads Associated with Metal FmhMng, U S Enwronmental Protwbon<br />
Agency.Junel980.<br />
high<br />
... 9.. .<br />
.. - .. . . 5<br />
..<br />
ground<br />
Automatlc electmstatic spray system.<br />
A dmph piupin connecthm brings<br />
high voitage to the gun for high-solids<br />
or other hlgh resistance paints.<br />
Watsrrbome paints rsquire no dlrect<br />
high voltage connection to the gun<br />
dnce it k applied directly to the fiuM<br />
suppry system.<br />
problems but do not hesitate to<br />
spend money if they can recover<br />
the investment in a short period of<br />
time. We don’t sell a system unless<br />
the pay-back period is less than two<br />
years.”<br />
According to Walberg, the pla&<br />
tics <strong>and</strong> wood industries are still<br />
spraying with conventional spray<br />
equipment. Non-conductive items<br />
such as wood <strong>and</strong> plastic can be<br />
sprayed electrostatically if con-<br />
ductive water-bome coatings me<br />
used. But this would necessitate a<br />
shift away from conventional<br />
solvent-borne paints, a shift the<br />
industry has been reluctant to<br />
make.<br />
B Flexsteel Industries (Dubuque,<br />
Iowa) changed from a conven-<br />
tional air spray to an electrostatic<br />
finishing system at its furniture<br />
plant.= In doing so, the company<br />
reduced overspray by 40% <strong>and</strong><br />
saved itself $15,000 a year in new<br />
paint costs. Pay-back for the Binks<br />
(Chicago, Illinois) manual elec-<br />
trostatic equipment is estimated<br />
at less than two vear~.*~
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