Coating processes – Measuring – testing – or indicating – Thickness or uniformity of thickness determined
Patent
1980-07-10
1982-05-11
Hoffman, James R.
Coating processes
Measuring, testing, or indicating
Thickness or uniformity of thickness determined
427 10, 427 32, B05D 106, B05D 720
Patent
active
043293778
ABSTRACT:
Wire is coated with an insulator in an electrostatic coating machine which establishes a potential difference between the wire and the insulation and thereby causes the insulation to adhere to the wire electrostatically, without the use of solvents. After such coating, the coated wire is sintered and hardened in order to form a lacquered wire with a uniform insulation thickness. Insulation thickness can be maintained at a desired value by adjusting the length of wire being exposed to the insulator in pulverized form within the electrostatic coating machine and/or the potential difference therein. The supply of insulator used in pulverized form is continuously fed into the electrostatic coating machine so as to prevent smaller and lighter particles from being first attracted to the wire, and thereby depleting such particles excessively while leaving only larger and heavier particles available for coating. The final thickness of the insulation is constantly kept within a predetermined tolerance by varying the rate of feed of insulator supply to the coating machine directly as a function of insulation thickness, which insulation thickness is continuously monitored.
REFERENCES:
patent: 3801349 (1974-04-01), Wilson et al.
Radeck Fritz
Schmitt Alfons
Voelker Wolfgang
Felten & Guilleaume Carlswerk Aktiengesellschaft
Hoffman James R.
Striker Michael J.
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