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Related Experiment Videos

Ultrasonic sensor to characterize wood pulp during refining.

M S Greenwood1, P D Panetta, L J Bond

  • 1Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352, USA. Margaret.greenwood@pnl.gov

Ultrasonics
|August 22, 2006
PubMed
Summary

A new sensor rapidly measures wood pulp refining degree and water retention value (WRV) using ultrasound during processing. This innovation offers a faster alternative to traditional, time-consuming industry methods.

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Area of Science:

  • Pulp and Paper Science
  • Materials Science
  • Sensor Technology

Background:

  • Traditional methods for measuring wood pulp properties like refining degree and water retention value (WRV) are time-consuming.
  • Accurate and rapid monitoring of these parameters is crucial for optimizing the refining process in the pulp and paper industry.

Purpose of the Study:

  • To develop and validate a novel sensor concept for real-time measurement of wood pulp refining degree and WRV.
  • To provide a faster, at-line or slip-stream alternative to existing industry standard tests.

Main Methods:

  • A novel sensor utilizes ultrasound attenuation to monitor the settling behavior of wood pulp suspensions.
  • The 'peak time' of ultrasound attenuation correlates with the degree of refining.
  • Relative peak time (T(2)/T(1)) is used to determine the water retention value (WRV).

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Main Results:

  • The developed sensor accurately measures the degree of refining, with peak time increasing as refining progresses.
  • Water retention value (WRV) can be effectively determined using the relative peak time.
  • Measurement time is significantly reduced to less than 5 minutes.

Conclusions:

  • The novel sensor provides a rapid and accurate method for assessing key wood pulp properties during refining.
  • This technology offers a valuable alternative to conventional WRV testing, improving process efficiency.
  • The sensor's ability to operate in slip-stream or at-line modes enhances its industrial applicability.