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Method and apparatus for the coating of paper and, in particular, paperboard or cardboard with highly viscous coating mixtures, in order to achieve a good cover in combination with a very good smoothness of the coating to achieve
Method and apparatus for the coating of paper and, in particular, paperboard or cardboard with highly viscous coating mixtures, in order to achieve a good cover in combination with a very good smoothness of the coating to achieve
A method and apparatus for coating a paper or a paper board web (5), comprising spreading coating mix having a solids content of 55 to 75 % on the surface of the web (5) with a nozzle applicator (3, 9), levelling and metering the spread coating mix on the surface of the web by a doctor element (7) capable of producing a high hydrodynamic force on the contacting layer between the doctor element (7) and the web (5), the doctor element (7) being located downstream of the applicator (3, 9) so that the dwell time between the spreading of the coating mix to the metering is 72-2400 ms. The web speed is preferably 100-1000 m/s. A good smoothness and coverage is achieved by this method due to long dwell time.
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