Method for optimizing the energy balance in forming sections in machines for the production of fibrous webs, and forming section
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United States of America Patent
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Jan 8, 2013
Grant Date -
Feb 3, 2011
app pub date -
Aug 18, 2010
filing date -
Jul 24, 2008
priority date (Note) -
Expired
status (Latency Note)
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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.
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