US Patent 7694646 Paper/board web coating apparatus

A coating apparatus, has a nozzle unit (1) with at least one feeding chamber (12) extending in the longitudinal direction (W) of the coating apparatus. Coating color is conveyed into the chamber by feeding means (4), and a nozzle slot (30) in flow communication with the said feeding chamber, the slot also extending in the longitudinal direction (W) of the coating apparatus. The flow communication between the at least one feeding chamber (12) and the nozzle slot (30) is formed by feed holes (14; 18) made in one wall of the feeding chamber, through which the coating color can be conveyed to the nozzle slot. The nozzle unit has means (15, 16; 19) by which the effective area of the feed holes (14; 18) can be adjusted in order to accomplish transverse profiling of the amount of coating color.