Coating solution applying method and apparatus

Coating processes – Centrifugal force utilized

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4273855, 437231, B05D 312

Patent

active

058435271

ABSTRACT:
A method of applying a coating solution to spinning substrates, in which a controller causes a rotary support to spin a substrate at low speed with a predetermined supplying rotational frequency. The coating solution is supplied through a coating solution supply nozzle to a region centrally of the substrate spinning at low speed. The rotational frequency of the substrate is increased to a target rotational frequency before the coating solution supplied to the substrate spreads over an entire surface of the substrate. Then, the controller causes the rotary support to spin the substrate at high speed with a predetermined film-forming rotational frequency, thereby coating the surface of the substrate with a film of desired thickness. Also, an apparatus for performing such method.

REFERENCES:
patent: 4267212 (1981-05-01), Sakawaki
patent: 5066616 (1991-11-01), Gordon
patent: 5254367 (1993-10-01), Matsumura et al.
"An experimental study of rivulet instabilities in centrifugal spin coating of viscous Newtonian and non-Newtonian fluids" by Nathalie Fraysse and George M. Homsy; Phys. Fluids, vol. 6, No. 4, Apr. 1994; pp. 1491-1504.

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