| 摘要 |
An assembly is disclosed treating a moving web ( 1 ) of paper or paperboard with a web treatment substance, the assembly comprising an application chamber (P 2 ) located in a close vicinity of the moving web ( 1 ) and facing the web ( 1 ), whereby the chamber is delineated by the web ( 1 ), the walls ( 12 ) of the coater apparatus and sealing means ( 18, 24, 35 ) adapted to operate at the web ingoing and outgoing sides of the application chamber (P 2 ). For application of the web treatment substance, the assembly includes at least one linear nozzle array incorporating at least one nozzle ( 21 ) for spraying the web treatment substance onto the web ( 1 ). The coater apparatus is divided into chambers so that a suction chamber (P 3 ) is located behind the application chamber (P 2 ) as seen from the direction of the web ( 1 ) and is adapted to communicate with application chamber (P 2 ), and a flow is established into the suction chamber (P 3 ) and the application chamber (P 2 ) for removing mist and accumulations of the web treatment substance in such a manner that the pressure of the application chamber (P 2 ) is made lower than the ambient pressure and the pressure of the suction chamber (P 3 ) lower than that of the application chamber. In the assembly, the free flow direction of substances contained in the assembly is firstly from the surroundings into the application chamber (P 2 ) and then from the application chamber (P 2 ) to the suction chamber (P 3 ) and means ( 22 ) serving to establish the flow.
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