Coating device having two separate collection troughs connected to each other

A device for applying a coating composition to the surface of a fiber web passing by the device, the device comprising:

• a rotatable application roll having a feed position located on an outer surface of the roll, a film of coating composition being delivered to the outer surface of the roll at the feed position, the roll having a delivery position located on the outer surface of the roll downstream from the feed position in a rotation direction of the roll, the application roll delivering the coating composition to the fiber web at the delivery position;
• a nozzle applicator for delivering the film of coating composition to the application roll surface at the feed position, the applicator comprising:
• a nozzle chamber for receiving coating composition, an outlet nozzle extending from the chamber and located at the feed position for delivering the coating composition to the surface of the application roll at the feed position, the nozzle being defined by two spaced apart lips;
• one of the nozzle lips being a leading lip located downstream from the feed position in the direction of roll rotation, the leading lip having a first free end which supports a metering doctor that cooperates with the surface of the application roll to form an outlet slot for creating a metered film of coating composition on the application roll;
• the other nozzle lip being a trailing lip located upstream from the feed position in the direction of roll rotation, the trailing lip having a second free end that is spaced away from the surface of the application roll and forms an overflow slot between the second free end of the trailing lip and the application roll for receiving an excess stream of the coating composition passing from the nozzle chamber through the nozzle;
• an overflow trough placed at an outlet side of the overflow slot to receive the excess stream of coating composition from the overflow slot;
• a cleaning device for cleaning the outer surface of the roll, the cleaning device located upstream from the feed position in the rotation direction of the application roll and between the delivery position and the feed position, the cleaning device comprising;
• a scraper comprising a scraper blade having a blade edge for cooperating with the roll surface at a location upstream from the nozzle in the rotation direction of the application roll;
• a liquid source for applying liquid to the surface of the roll at a location upstream from the scraper in the rotation direction of the application roll;
• and
• a liquid collection trough arranged along the surface of the application roll at a location upstream from the scraper blade in the rotation direction of the application roll, the scraper blade being arranged relative to the liquid collection trough to direct liquid scraped by the scraper from the application roll into the liquid collection trough, wherein the liquid collection trough is connected directly to the overflow trough.