Quantification of the Impact of Fibre Flexibilization and Secondary Fines on Tensile Strength Gain after Refining

Daniel Mandlez*, Sarah Koller, Rene Eckhart, Wolfgang Bauer, Ulrich Hirn

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference paperpeer-review


Within this research activity unbleached softwood kraft pulp was refined with a lab scale disc refiner and a PFI-Mill by use of different refining intensities. After refining, the fines fraction was separated by a lab scale pressure screen. For each refining configuration and intensity hand sheets were built with and without fines to obtain values for the breaking length. Thereby it was possible to calculate and quantify the tensile gain achieved on one hand by secondary fines and on the other hand by internal and external fibrillation of the fiber itself.
Original languageEnglish
Title of host publicationProgress in Paper Physics Seminar 2020
Subtitle of host publicationAbstract Book of the PPPS2020 Seminar
EditorsJarmo Kouko, Jani Lehto, Tero Tuovinen
PublisherVTT Technical Research Centre of Finland
ISBN (Electronic)978-951-38-8736-0
ISBN (Print)978-951-38-8738-4
Publication statusPublished - Sep 2020
Event2020 Progress in Paper Physics Seminar - Original Sokos Hotel Alexandra, Hybrider Event, Finland
Duration: 1 Sep 20203 Sep 2020

Publication series

NameVTT Technology


Conference2020 Progress in Paper Physics Seminar
Abbreviated titlePPPS 2020
CityHybrider Event
Internet address


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