Curtain coating method with reduced neck-in

Details Curtain coating method with reduced neck-in Curtain coating method with reduced neck-in

1992-06-02

1994-04-19

Beck, Shrive

Coating processes

Falling curtain of coating material utilized

118324, 118DIG4, B05D 130

Patent

active

053044029

ABSTRACT:
A film applying method in which a coating solution is applied by a solution injector having an edge guide onto a support member as a freely falling coating film, includes forming a solution contact surface of the edge guide to have one of a radius greater than 1.0 mm or a width d greater than 0.7 mm when the coating solution has at least one of a viscosity greater than 45 cp and a dynamic surface tension difference greater than 8 dyne/cm. The edge guide solution contacting surface is narrowed to have a radius less than 1.0 mm or a width d less than 0.7 mm when the coating solution has at least one of a viscosity less than 45 cp and a dynamic surface tension difference less than 8. In a second embodiment, the coating solution is prepared to have at least one of a viscosity greater than 45 cp and a dynamic surface tension difference greater than 8 dyne/cm when the solution contacting part of the edge guide has either a radius r greater than 1.0 mm or a width d greater than 0.7 mm. Alternatively, the coating solution is prepared to have at least one of a viscosity less than 45 cp and a dynamic surface tension difference less than 8 dyne/cm when the solution contacting part of the edge guide has either a radius r less than 1.0 mm or a width d less than 0.7 mm.

REFERENCES:
patent: 3632403 (1969-12-01), Greiller
patent: 4135477 (1979-01-01), Ridley
patent: 4944533 (1990-12-01), Ishizuka et al.
J. Fluid Mech. (1981), vol. 112, pp. 443-458-"Waves in a Viscous Liquid Curtain".

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