Inventors:
Mika Leino - Jarvenpaa, FI
Stig Renvall - Charlotte NC
Stefan Kuni - Jarvenpaa, FI
Petri Paloviita - Appleton WI
Assignee:
Valmet Corporation - Helsinki
International Classification:
B05D 312
Abstract:
A method and apparatus for coating a paper or a paper board web, comprising spreading coating mix having a solids content of 55-75% on the surface of the web with a nozzle applicator, levelling and metering the spread coating mix on the surface of the web by a doctor element capable of producing a high hydrodynamic force on the coating layer between the doctor element and the web, the doctor element being located downstream of the applicator 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.