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Nonincendive rotary atomizer
| Details |
Inventors: Howe, Varce E.; Huff, David R.; McPherson, Jr., Jerry L.; Scharfenberger, James A.;
Assignee: Ransburg Corporation (Indianapolis, IN)
Primary Examiner: Michl; Paul R.
Assistant Examiner: Rajguru; U. K.
Attorney, Agent or Firm: Barnes & Thornburg
A fluent, electrically non-insulative coating composition for an electrically non-conductive rotary atomizer comprises about one-tenth to about one-seventh, by weight, short oil alkyds, about one-fourth to about one-third, by weight, phenolic, and about one-half to about two-thirds, by weight, powdered mixture of oxides of antimony and tin, all in a fluid carrier. |
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DETAILED DESCRIPTION The present invention contemplates providing a superior coating material dispensing system by providing: a stable semiconductive bell; reduced use of metal, and thus, reduced capacitance; and, constant voltage output cascade and control technology.
The combination of these features results in an applicator capable of achieving agency approval, capable of superior transfer efficiency, and capable of dispensing a wider variety of coating materials.
"Electrically non-conductive" and "electrically non-insulative" are relative terms.
In the context of this application, "electrically non-conductive" means electrically less conductive than "electrically non-insulative.
" Conversely, in the context of this application, "electrically non-insulative" means electrically more conductive than "electrically non-conductive.
" In the same way, "electrically non-conductive" means electrically less conductive than "electrically conductive" and "electrically conductive" means electrically more conductive than "electrically non-conductive.
" According to a first aspect of the invention, unique methods are provided for producing the proper combination of resistance and capacitance in a bell.
These methods are capable of the same high performance as grooved metal bells of the type described in, for example U.
S.
Pat.
No.
4,148,932.
According to a second aspect of the invention, a high voltage circuit is provided which incorporates state-of-the-art cascade power supply technology, and uses relatively low fixed resistance between the electrostatic power supply output and bell.
This ensures high operating voltage and performance superior to, for example, U.
S.
Pat.
No.
4,887,770's resinous bell (see FIG.
1), and hand guns of the type described in, for example, U.
S.
Pat.
Nos.
3,021,077, 2,926,106, 2,989,241, 3,055,592 and 3,048,498.
The voltage/current "operating window" is based on typical operating characteristics for electrostatic applicators of this type, and competitive metal bell devices.
Such devices have been tested and typically found to operate in this voltage/current range
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Semiconductor manufacture 
