Curtain Coating Device

A curtain coating device for paper and board machines comprising:

• a nozzle beam;
• wherein on the nozzle beam are two edge strips which are positioned to contain a coating color curtain as the coating color curtain flows to a nozzle lip of the nozzle beam;
• wherein the nozzle lip has first and second edges between which the coating color curtain is contained;
• an edge guide located below each of the first and second edges of the nozzle lip so as to control the width of the coating color curtain after the nozzle lip;
• wherein each edge guide comprises:
• an upper end, and a lower end;
• flow surfaces extending downward between the upper end and the lower end in a substantially vertical direction;
• wherein the flow surfaces are next to each other and inclined toward each other so as to form a concave surface and to define a concave flow guide recess extending between the flow surfaces, and concave with respect to the coating color curtain, the concave flow guide recess extending in the substantially vertical direction;
• a protrusion extending in the substantially vertical direction of the flow guide recess and on the concave surface, wherein the protrusion defines two sides of the concave surface between which is positioned the protrusion;
• a lubrication liquid feed and additional lubrication liquid feeds arranged to supply lubrication liquid onto the concave surface;
• and
• a suction opening arranged to receive the lubrication liquid supplied by the lubrication liquid feed and the additional lubrication liquid feeds.