Coating processes – Measuring – testing – or indicating – Thickness or uniformity of thickness determined
Patent
1976-02-12
1977-05-03
Kaplan, Morris
Coating processes
Measuring, testing, or indicating
Thickness or uniformity of thickness determined
141DIG1, B05D 106
Patent
active
040215873
ABSTRACT:
An apparatus for depositing electrostatically and magnetically responsive particulate matter on a conductive surface having an electrostatically charged latent image comprises an elongate permanent magnet that is disposed adjacent to the conductive surface and that is capable of producing a magnetic field having a region of concentrated magnetic flux that permeates the surface and also a region of dilute magnetic flux that is inclined and generally adjacent to the surface, a hopper for storing the particulate matter, and a channel connected to the hopper disposed in the region of dilute magnetic flux having two opposite converging walls that terminate adjacent to the conductive surface in the region of concentrated magnetic flux. The particulate matter when introduced to the region of dilute magnetic flux is caused to be moved by magnetic forces and gravitational forces from the region of dilute magnetic flux to the region of concentrated magnetic flux. The particulate matter is deposited on the surface by the electrostatic forces overcoming the magnetic forces in the region of concentrated magnetic flux. The application also discloses a process for depositing particulate matter on a moving conductive surface by producing a magnetic field having a region of concentrated magnetic flux that permeates the surface and a region of dilute magnetic flux that is inclined and generally adjacent to the surface, introducing a quantity of the particulate matter to the region of dilute magnetic flux, and then placing the conductive surface into the region of concentrated magnetic flux whereby the particulate matter is caused to move from the region of dilute magnetic flux to the region of concentrated magnetic flux by magnetic forces and gravitational forces and thence to the conductive surface by overwhelming electrostatic forces.
REFERENCES:
patent: 2890968 (1959-06-01), Giaimo, Jr.
patent: 2892446 (1959-06-01), Olden
patent: 2930351 (1960-03-01), Giaimo, Jr.
patent: 2984163 (1961-05-01), Giaimo, Jr.
patent: 3681138 (1972-08-01), Ankenbrand et al.
patent: 3717122 (1973-02-01), Hudson
Kaplan Morris
Pram Inc.
Trenor Fred C.
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