Method for optimizing the energy balance in forming sections in machines for the production of fibrous webs, and forming section

US8349136B2 · kind B2 · utility

Assignee

• Voith Patent GmbH · DE

Inventors

• Thomas Ruehl · Wernau, DE
• Moritz Schmalenbach · Karlsruhe, DE
• Volker Schmidt-Rohr · Heidenheim, DE
• Marco Esper · Heidenheim, DE
• Oliver Kaufmann · Augsburg, DE

Key dates

• Filing date: Aug 18, 2010
• Grant date: Jan 8, 2013
• Expiry date: Aug 24, 2030

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D21F9/003
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a method for optimizing the energy balance of a forming section in a machine for producing fibrous webs, in which a fiber suspension, which is fed to the forming section by way of a material ramp after the immobility point is reached, is passed through at least two dewatering units within a compression zone and to a subsequent functional unit. The invention is characterized in that a setpoint value for a target dryness to be set is predefined based on the existing dewatering elements as a function of a theoretical maximum achievable dryness under plant conditions in the area of the transition zone, said setpoint being selected such that it is less than the theoretical maximum achievable dryness but is equal to or greater than a required minimum dryness in the area of the transition zone, and that the target dryness is controlled by lowering the inlet dryness at one of the last dewatering units disposed in the direction of passage of the fiber suspension within the compression zone.