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Monitoring cross-thickness distributions of fines and CMF by dyeing and optical measurement
RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
2018 (English)In: PaperCon 2018: Shaping the future through innovation, TAPPI , 2018, article id FF3Conference paper, Published paper (Refereed)
Abstract [en]

A methodology has been verified where the ZD-distribution of a component of the furnish (fines or CMF) can bemonitored. The component to be monitored was dyed using a direct azo-dye before addition to the furnish. Theproduced sheets were sectioned in cross-thickness direction by sequential heat-seal lamination and splitting, usingplastic pouches. The amount of dyed material in a split was monitored using thea* and L* parameters of the CIELabcolor space and the opacity, all measured simultaneously with a spectrophotometer. The value on the green-redaxis,a*, the lightness, L, and the opacity were combined into a new parameter, -a*L/opac. Two mechanisms forfines retention was observed by laboratory studies, mechanical retention by filtering process in the formed fiber weband chemical retention by agglomeration to the fibers.The methodology has recently been applied for monitoring cross-thickness distributions of either CMF or fines inpaper produced in pilot scale trials. For example, it was demonstrated, that the machine settings affected themechanisms for retention of fines in the fiber web during sheet forming and dewatering, with different distributionsof fines in the cross-thickness direction as result.

Place, publisher, year, edition, pages
TAPPI , 2018. article id FF3
Keywords [en]
z direction, fines, CMF, dyeing, filtering, agglomeration, monitoring
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-35395Scopus ID: 2-s2.0-85060374553ISBN: 978-1-59510-268-3 (print)OAI: oai:DiVA.org:ri-35395DiVA, id: diva2:1256145
Conference
PaperCon 2018, April 15-18, 2018, Charlotte, NC, USA
Available from: 2018-10-16 Created: 2018-10-16 Last updated: 2019-03-19Bibliographically approved

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CiteExportLink to record
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  • apa
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