Patent ID: 6346299
Filing Date: 2002-02-12
Classification: B05C,B05D,Y10S

Abstract:
A method for forming a uniform operating wetting line on a rear surface of a lip of a curtain coating hopper having a coating width comprising the steps of:(a) moving a trough including a channel that is open at both ends thereof proximate to the lip to intercept a liquid flowing over the lip while maintaining the trough in a non-contacting relationship with the lip, the trough having a width between approximately 2 and 0.2 inches narrower than the coating width; (b) flowing a liquid from the curtain coating hopper over the lip, the liquid filling the trough and flowing partially up the rear surface of the lip to wet the rear surface to an elevation which is higher than the uniform operating wetting line; and (c) moving the trough away from the lip to allow a liquid curtain to form and to establish the uniform operating wetting line.