Unlocking Paper Quality: Ultrasonic Insights into Pulp Properties

Industry: The paper industry focuses on understanding the properties of pulp suspensions to improve the quality of the final paper product. This research is significant for optimizing the manufacturing process by characterizing the pulp based on its composition and fiber properties.

Challenge: The main challenge addressed in this study is accurately measuring and modeling the phase velocity and attenuation in pulp suspensions. This is essential for determining the fiber content and characteristics within the suspension, which directly impact the quality of the paper.

Extraordinary Aspects of the Paper: This study presents two novel methods for characterizing pulp suspensions:

A phase velocity method that avoids phase unwrapping issues in weakly dispersive media.

An attenuation-based method for determining wood fiber properties, highlighting the relationship between fiber mass fraction and dispersion.

Equipment & Sensors Used:

GaGe Digitizer: CompuScope 14100, 14-bit resolution, 100 MHz sampling rate and GaGe CompuScope 102G digitizer, 10-bit resolution, 2 GHz sampling rate.

Broadband Transducer: Panametrics V311 , center frequency 10 MHz and Panametrics V333 transducer, center frequency 30 MHz.

Pulser/Receiver: Panametrics 5072PR.

Temperature Monitoring: Digital thermometer F250, Automatic Systems Laboratories LTD.

Measurement Cell: Custom-built, detailed in previous studies.