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Molecular Biology

Method-of-depositing-electrostatically-charged-liquid-coating-material

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Method of depositing electrostatically charged liquid coating material

Details

Inventors: Juvinall, James W.; Kock, Erhard;
Assignee: Ransburg Corporation (Indianapolis, IN)
Primary Examiner: Newsome; John
Assistant Examiner:
Attorney, Agent or Firm: Johnson; Merrill N.

Electrostatic deposition of air atomized liquid coating materials by adjusting the conductivity of the coating material and the voltage applied thereto so that virtually no air ionization occurs. Thus, essentially all of the current reaching the object to be coated is carried by the sprayed material thus minimizing the charge build-up on the subject, and eliminating charge accumulation on ungrounded objects out of the spray zone.

DETAILED DESCRIPTION What we claim is: 1.
In a method of depositing liquid coating material on an article in a system in which coating material particles are formed from a thin stream of a liquid body by mechanical force derived from a stream of atomizing air, and in which the liquid body is electrically charged, the improvement comprising the step of adjusting the resistivity of the coating material to be between 0.
3 and 300 megohm-centimeters and charging the liquid body to such voltage that at least 95 percent of the current carried to the article is borne by the charged coating material particles and not more than 5 percent of the current is air-borne.
2.
The method of depositing liquid coating material on an article in accordance with claim 1 in which the resistivity of the coating material lies between 2.
5 and 150 megohm-centimeters.
3.
The method of depositing liquid coating material on an article in accordance with claim 1 in which the voltage applied to the liquid body lies between 12 and 40 kilovolts.
4.
The method of depositing liquid coating material on an article in accordance with claim 1 in which the resistivity of the coating material lies between 0.
3 and 300 megohm-centimeters and the voltage imposed thereon lies between 12 kv.
and 40 kv.
5.
In a method of depositing liquid coating material on an article in a system in which coating material particles are formed from a thin stream of a liquid body by mechanical force derived from a stream of atomizing air, and in which the liquid body is electrically charged, the improvement comprising the step of adjusting the resistivity of the coating material to be between 0.
3 and 300 megohm-centimeters and charging the liquid body to such voltage that at least 99 percent of the current carried to the article is borne by the charged coating material particles and not more than 1 percent of the current is air-borne.
6.
The method of depositing liquid coating material on an article in accordance with claim 5 in which the resistivity of the coating material lies between 2

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