US 9,808,824 B2
Arrangement in connection with curtain coating of a fibrous web
Heikki Vatanen, Järvenpää (FI); and Timo Nurmiainen, Järvenpää (FI)
Assigned to VALMET TECHNOLOGIES, INC., Espoo (FI)
Filed by Heikki Vatanen, Järvenpää (FI); and Timo Nurmiainen, Järvenpää (FI)
Filed on Sep. 10, 2015, as Appl. No. 14/850,635.
Claims priority of application No. 20144192 (FI), filed on Sep. 11, 2014.
Prior Publication US 2016/0074898 A1, Mar. 17, 2016
Int. Cl. B05C 5/00 (2006.01); B05C 3/00 (2006.01); B05C 11/00 (2006.01); B05C 11/10 (2006.01); D21H 23/48 (2006.01)
CPC B05C 5/005 (2013.01) [B05C 11/1039 (2013.01); D21H 23/48 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A curtain coater, comprising:
a movable nozzle beam forming a coating material curtain for coating a fibrous web;
a return reservoir forming an upwardly opening reservoir, and a collecting surface which drains into the upwardly opening reservoir so as to receive coating material and cleaning fluid from above, the collecting surface extending to a tip in a direction which extends over the web toward the nozzle beam when the nozzle beam is positioned for coating the fibrous web, the collecting surface arranged to collect the coating material at least before or after the coating of the fibrous web;
a source of cleaning fluid positioned above the return reservoir;
a mechanism for moving the nozzle beam from a position over the return reservoir and the collecting surface to a position over the web for coating the web;
at least one support member for guiding the fibrous web below the coating material curtain when the nozzle beam is in the position over the web;
a cover plate movably mounted to swing around a pivoted shaft connected to the cover plate, the pivoted shaft extending in a cross-direction with respect to a direction of travel of the fibrous web;
wherein the cover plate is movable between at least two positions, a front position where the cover plate extends beyond the collecting surface tip and toward the coating material curtain positioned for coating the fibrous web and a cleaning position where the cover plate is located to extend above the collecting surface of the return reservoir and positioned with respect to the source of cleaning fluid such that cleaning fluids applied to the cover plate are conveyed to the return reservoir; and
wherein the cover plate is mounted for movement between the cleaning position and the front position.