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Comparison of Optical Methods for Fines and Filler Characterization
KTH, School of Chemical Science and Engineering (CHE).
2015 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
En jämförelse av hur olika optiska metoder kan användas för att karaktrisera fines och fyllmedel (Swedish)
Abstract [en]

This thesis presents an evaluation study of three different image analysis instruments (FiberTester, FiberTester+ and ImageStream) and a laser diffraction (LD) instrument, for the analysis of the fine fraction of a stock. The instruments had different spatial resolutions and measurement ranges.

Measurements were made on three different samples; pulp fines, paper filler (precipitated calcium carbonate) and the mix of them. Two comparisons were made; one with only data from image-based analysers, and one where LD data was also included. In the first comparison, the data was area-weighted, while in the second comparison, it was volume-weighted. To conduct a meaningful data comparison between the imaging and LD techniques, the multi-parameter imaging data was transformed to Equivalent Sphere Diameter.

For the pulp fines sample, LD did not exhibit particles with Equivalent Sphere Diameter smaller than 6 μm and showed poor correlation with Image-based analysers. However, the LD results correlated better with Image-based methods for PCC particles. The ImageStream was the most capable instrument for detecting smallest particles among all the analysers. Among the image-based analysers, FT+ delivered the best results for relatively large particles.

Place, publisher, year, edition, pages
2015.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-216999OAI: oai:DiVA.org:kth-216999DiVA: diva2:1153028
External cooperation
Innventia AB
Available from: 2017-10-27 Created: 2017-10-27 Last updated: 2017-10-27Bibliographically approved

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CiteExportLink to record
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