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2019 Vol.51, Issue 2
Effect of Dilution Water on Pulp Consistency in Cross-directional Basis Weight Control
Wen-juan Shan†
,
Wei Tang1
Department of Light Industry Science and Engineering, Shaanxi University of Science & Technology, Xi’an, 710021
1Department of Electrical and Information Engineering, Shaanxi University of Science & Technology, Xi’an, 710021
†Corresponding author: E-Mail: swj0230@126.com
30 April 2019. pp. 3-15
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Abstract

Cross-directional basis weight of paper based on hydraulic headbox is adjusted by the opening of dilution water valve. In order to achieve uniform concentration distribution of paper sheet, a research on the effect of dilution water added to the mainstream on concentration and flow was studied by experimental set-up and mathematical modeling in this paper. Based on the numerical simulation results, a scale model of headbox was derived to predict the water content distribution and pulp consistency distribution. Results show that these models could accurately predict the experimental flow characteristics of a pulp suspension with dilution water added. Compared with slice regulation, the inverse response problem and its improvement method were discussed. By parameters improvement of pulp consistency model, the reverse response on both sides can be well eliminated or balanced when the dilution water was adopted to cross-directional profile control system. It ensures that the influence range of a single dilution water valve is controllable, which improves the adjustment accuracy of cross-directional profile control and thus improves the paper quality.

Keywords
Paper basis weight
cross-directional control
pulp concentration
dilution water
reverse response
numerical simulation
References

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Information
  • Publisher :Korea Technical Association of The Pulp and Paper Industry
  • Publisher(Ko) :한국펄프종이공학회
  • Journal Title :Journal of Korea TAPPI
  • Journal Title(Ko) :펄프종이기술
  • Volume : 51
  • No :2
  • Pages :3-15
  • Received Date : 2019-01-18
  • Revised Date : 2019-02-19
  • Accepted Date : 2019-03-25
  • DOI :https://doi.org/10.7584/JKTAPPI.2019.04.51.2.3
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