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Name: Kelly M.
Status: Student
Age: 14
Location: N/A
Country: N/A
Date: October 2003


Question:
What are the advantages of electrically charging an object before spray painting it?



Replies:
Elactrostatic spraying is a common industrial method of coating. Usually the spray gun is charged and the object is grounded. The operator must also be insulated from the charged spray gun. The reverse (grounded gun / operator) can also be used. The principle is that the particles of coating (either liquid or powder) are charged with a charge opposite that of the object being coated. The advantage is that since opposite charges attract the coating will be more efficiently deposited on the object being sprayed. "Over spray" -- spray that does not hit the object -- is minimal because of the electrostatic charging. More even distribution of the coating also occurs, because the spray particles can get into cracks, and scratches. In fact, the "back side" of the object is coated with almost the same efficiency as the "front side" because spray particles that miss the object "wrap around" the object and are deposited on the rear of the article.

Vince Calder



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