Patent ID: 7833386

Claim:
A twin mesh former of a machine for producing a web of fibrous material from at least one fibrous suspension, said twin mesh former comprising: two rotating endless meshes including a first mesh and a second mesh, said two rotating endless meshes at least in part together forming a twin mesh zone including a wedge-shaped inlet nip; a positionable inlet roller; a movable dewatering box; a first plurality of rails, in said twin mesh zone said first mesh, which is passed over said positionable inlet roller, running over said first plurality of rails, said first plurality of rails being rigidly arranged a distance from each other on said movable dewatering box; a first plurality of compliant elements; a second plurality of rails which is arranged opposite said first plurality of rails of said movable dewatering box, supported by said first plurality of compliant elements, and configured for being pressed with a selectable first force against said second mesh, said second mesh running in said twin mesh zone over said second plurality of rails; at least one additional rail which is positionable against said second mesh, the twin mesh former having an inlet nip region and an adjustable intersection point region, said inlet nip region being associated with said inlet nip of said twin mesh zone, said adjustable intersection point region being associated with an adjustable intersection point, in said inlet nip region, in which said first mesh intersects at an adjustable intersection angle at said adjustable intersection point with the fibrous suspension lying on said second mesh, said at least one additional rail being positionable against said second mesh and being arranged such that a locally acting dewatering pulse is introduced by said second mesh into the fibrous suspension in said adjustable intersection point region; and a forming box, said at least one additional rail being movable relative to said forming box, being positionable against said second mesh, and being arranged on said forming box, which is configured for being positioned and which indirectly acts against said second mesh.