B - Operations – Transporting – 05 – D
Patent
B - Operations, Transporting
05
D
32/16, 117/54
B05D 1/04 (2006.01) B05B 5/08 (2006.01) B05B 5/14 (2006.01) B05B 17/06 (2006.01) B05C 5/02 (2006.01) B05D 1/26 (2006.01) G11B 5/84 (2006.01)
Patent
CA 1299933
7219 METHOD AND APPARATUS FOR APPLYING ULTRA-THIN COATINGS TO A SUBSTRATE ABSTRACT OF THE DISCLOSURE An electrostatic coating method and apparatus are provided that are capable of applying an extremely thin and virtually constant thickness coating to a substrate, and includes a coating applicator having an opening formed of dielectric material through which coating material flows for coating purposes. The coating material supplied to the applicator is pressurized to maintain a substantially constant volume of coating material at the applicator opening output and is vibrated in the vicinity of the applicator opening to provide a uniform flow of coating material to the applicator out- put, to stabilize the shape of the coating material at the applicator output and to preclude changes in coating material flow rate caused by electrostatic field induced coating material dryout. An electrostatic field of pre- determined magnitude is established between the coating material surface and the adjacent substrate to thereby extract minute, uniform size particles from coating material at the applicator opening and subsequently deposit an ultra-thin layer of these particles on the adjacent substrate as the substrate moves past the applicator opening. In dielectric substrate coating applications where a relatively thick coating layer is required, an electrostatic charge is established on the dielectric substrate, at a remote location, before the substrate is coated in order to neutralize the electro- statically charged coating material so that such coatings can be electrostatically applied.
560286
Kisler Semyon
Timson William J.
Tremblay John E.
Kisler Semyon
Polaroid Corporation
Smart & Biggar
Timson William J.
Tremblay John E.
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