Coating Device for Applying Coating Color onto a Fiber Web and Method for Coating of a Fiber Web

A coating device for applying coating color onto a fiber web, comprising:

• a nozzle unit;
• wherein the nozzle unit has at least one nozzle part;
• wherein first portions of the nozzle part form a feeding chamber extending in a cross machine direction to form a manifold for coating color;
• wherein second portions of the nozzle part form at least in part at least one equalizing chamber extending in the cross machine direction;
• wherein third portions of the nozzle part form a plurality of feed holes spaced apart in the cross machine direction along the nozzle part, the plurality of feed holes defining a plurality of feed hole outlets;
• wherein fourth portions of the nozzle part form a plurality of mixing chambers arrayed in the cross machine direction and opening into the equalizing chamber, and wherein each of the plurality of feed hole outlets opens into a corresponding one of the plurality of mixing chambers;
• wherein each feed hole extends between the feeding chamber and the equalizing chamber via one of the mixing chambers;
• wherein each mixing chamber has a wall surface opposite a corresponding one of the plurality of feed holes, the mixing chamber and the wall surface being arranged to distribute uniformly an inhomogeneous coating color flow entering the equalizing chamber from the corresponding one of the plurality of feed holes;
• and
• a nozzle slot having an outlet opening, formed at least in part by a surface of the nozzle part, the nozzle slot being arranged to conduct coating color from the equalizing chamber to be discharged through the outlet opening of the nozzle slot onto an upper surface of the coating device for applying coating color onto a fiber web.