Coating processes – Falling curtain of coating material utilized
Patent
1997-09-29
1999-11-02
Simmons, David A.
Coating processes
Falling curtain of coating material utilized
118325, 118DIG4, B05D 130, B05C 100
Patent
active
059766301
ABSTRACT:
A method and apparatus for preventing vortical air flow behind a free-falling curtain in a curtain coating apparatus. There is a critical region within the coating apparatus defined in part by a coating hopper, the free-falling curtain delivered from the coating hopper, a portion of the moving substrate supported on a roller to which the free-falling curtain is delivered, and an air shield located between the roller and the coating hopper. A first intake slot proximate to the moving substrate shield is used to remove boundary-layer air entrained on the moving substrate. A second intake slot positioned within the critical region is used to remove boundary-layer air entrained on the free-falling curtain. Each of the two intake slots is connected to vacuum source. One or two vacuum sources may be used.
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Douglas Finnicum, Steven Weinstein and Kenneth Ruschak, J. Fluid Mech. (1983), vol. 255, "The effect of applied pressure on the shape of a two-dimensional liquid curtain falling under the influence of gravity", pp. 647-665.
Deprez Robert J.
Finnicum Douglas S.
Hardenbrook Kurt S.
Korokeyi Solomon T.
Ruschak Kenneth J.
Bocchetti Mark G.
Eastman Kodak Company
Padgett Calvin
Simmons David A.
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