Assembly for treating web of paper of paperboard

一种用于用幅面料处理物质处理由纸或纸板制成的移动幅面料(1)的组件，该组件包括一个位于移动幅面料(1)附近区域并面向幅面料(1)的涂布腔室(P2)，从而由幅面料(1)限定腔室，涂覆机设备和密封装置(18，24，35)的壁(12)适于在涂布腔室(P2)的输入和输出侧操作。为了涂布幅面料处理物质，组件包括至少一个线性喷嘴阵列，其结合有至少一个用于将幅面料处理物质喷涂到幅面料(1)上的喷嘴(21)。涂覆机设备被分隔成多个腔室，一个从幅面料(1)方向观察位于涂布腔室(P2)后面并适于与涂布腔室(P2)连通的抽吸腔室(P3)，且在抽吸腔室(P3)和涂布腔室(P2)中建立一个流动，用于去除薄雾和幅面料处理物质的累积物，方式是使涂布腔室(P2)的压力低于环境压力，而抽吸腔室(P3)的压力低于涂布腔室的压力。在组件中，所包含物质的自由流动方向首先从周围环境进入涂布腔室(P2)，然后从涂布腔室(P2)到达抽吸腔室(P3)及装置(22)以建立流动。 A web processing agent is sprayed from high- pressure spray nozzles (21) pointing towards upward-moving web (1). When the measured value of processing agent adhering to the web is shifted from preset value, the solid mass flow-rate of the processing agent from the nozzles is changed accordingly. The solid mass flow-rate is controlled by adjusting supply pressure and/or rotational speed of processing agent feed pump. The solid content of the processing agent is adjusted by dilution with water. A gas-jet knife (24) provided at the upstream end of a suction zone (22), blows air into a suction chamber (25) provided at the downstream end. The negative pressure in the space (P1) on other side of the web and suction chamber is adjusted, before start up of spraying of the processing agent from the nozzles. The number of operating nozzles is increased gradually, during continuous coating of processing agent on the web. A nozzle cleaning procedure is implemented immediately after stoppage of spraying and the number of nozzles in operation are decreased. An air cleaner is used to clean aerosol mist contained in air evacuated from the space on other side of the web.