Multi-layered paper web i.e. multi-layered copying paper web, manufacturing method, involves regulating tension length ratio of web in z-direction by changing mixing concentration of mixing current in fiber suspension layer

摘要

The method involves distributing fiber suspensions (2.1, 2.2) in partial currents (6.1, 6.2) over a machine width (B) of a multi-layered flowbox (1) e.g. two-layered flowbox, with machine-width distribution devices in fiber suspension layers (7.1, 7.2). The partial current (6.1) of the fiber suspension layer (7.1) is supplied to regulate supply current (8.1) during production of mixing current with a mixing concentration (Cm). A tension length ratio of a multi-layered paper web in a z-direction is regulated by changing the mixing concentration in the suspension layer (7.1). Independent claims are also included for the following: (1) a multi-layered flowbox for manufacturing a multi-layered paper web (2) a system for manufacturing a multi-layered paper web.