Patent ID: 7135092
Filing Date: 2006-11-14
Classification: D21C,D21F,Y10S

Abstract:
1. An arrangement for controlling the edge of a pulp mass in a web former, the web former defining a wedge-shaped space extending in a machine direction between two opposing and converging wires for receiving the pulp mass, and having opposing side edges, the wires being supported to define the wedge-shaped space by respective chamber units, with each chamber unit including at least one chamber for receiving the water removed from the pulp mass, said arrangement comprising: an edge control device having at least one edge control element disposed between opposing chamber units about at least one side edge of the web former, and laterally extending at least partially between the opposing wires, the at least one edge control element further defining at least one channel extending therethrough, with the at least one channel being configured to direct a pressurized injection fluid outwardly therefrom, toward at least one of the opposing wires and the opposing chamber units, such that the pressurized injection fluid forms a seal between the at least one edge control element and the at least one of the opposing wires and the opposing chamber units, thereby substantially preventing the pulp mass from spreading laterally outward past the side edges of the web former.