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Active Dryer Control Eases Sheet Break Recovery

Pulp & Paper, 2008-09, Vol.82 (9), p.37

Copyright Paperloop, Inc. Sep 2008 ;ISSN: 0033-4081 ;CODEN: PUPAA8

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  • Title:
    Active Dryer Control Eases Sheet Break Recovery
  • Author: Hill, Kenneth C ; Vijh, David
  • Subjects: Heat transfer ; Printing machinery ; Pulp & paper industry ; Temperature ; Washers & dryers
  • Is Part Of: Pulp & Paper, 2008-09, Vol.82 (9), p.37
  • Description: Dryer temperature is a critical variable in determining how easily and quickly a paper machine recovers from a sheet break. The thermal response of a dryer and the drying rate of the paper are directly related to thermal resistance between the steam inside the dryer and the moisture held by the paper fibers. During a sheet break, the heat flow drops to levels that are typically 15% to 20% of the condensing load in the dryers. If the saturated steam temperature is held constant, by not changing the dryer pressure, the shell temperature will increase during the break. An "active dryer sheet break control strategy" can use a drying model to predict the ideal tail threading dryer temperature, while allowing for manual adjustments by experienced operators. Understanding the transient dryer temperature response helps produce consistent results for recovery from sheet breaks. Active modeling and control of dryers during sheet breaks helps to reduce the sheet break time and cull losses.
  • Publisher: San Francisco: RISI, Inc
  • Language: English
  • Identifier: ISSN: 0033-4081
    CODEN: PUPAA8
  • Source: ProQuest Central
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