University of Oulu

Measurement of TMP properties based on NIR spectral analysis

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Author: Koskinen, Jukka1,2; Kortelainen, Juha1,2; Ylimaula, Janne1,2;
Organizations: 1University of Oulu, Faculty of Technology, Control Engineering Laboratory
2University of Oulu, Faculty of Technology, Department of Process and Environmental Engineering
Format: ebook
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 0.4 MB)
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Language: English
Published: 2001
Publish Date: 2004-09-21


This report discusses a NIR analysis application of Thermomechanical pulp (TMP) properties measured with a TQA analyzer. TQA (Total Quality Analyzer) is ABB’s measurement device that measures in-line the NIR spectra from the pulp flowing through the blow line of a TMP process. The main purpose of this work was to measure the freeness, strength properties (tear index, tensile index) and light scattering coefficient of the pulp using the NIR spectra. Data for the calibration of the measurements was collected during several test runs in a Finnish TMP plant. The calibrated measurements were also tested with independent test data. The calibration was done using the Partial Least Squares method.

Furthermore, the NIR spectra were measured from the hand sheets made for the laboratory analysis using a laboratory FT-IR analyzer. Correlations between the spectral analysis and several pulp characteristics were studied.

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Series: Control Engineering Laboratory. Report A
ISBN: 951-42-7509-8
ISBN Print: 951-42-5892-4
Issue: 16
Copyright information: © University of Oulu, 2001. This publication is copyrighted. You may download, display and print it for your own personal use. Commercial use is prohibited.