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Refining systems for sack paper, Part II: Plug screw and Bivis treatment under pressurised conditions and subsequent LC refining
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences. (FSCN – Fibre Science and Communication Network)
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
Responsible organisation
2007 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 22, no 1, p. 61-71Article in journal (Refereed) Published
Abstract [en]

Unbleached kraft pulp for making sack paper is usually first refined in a high consistency process followed by low consistency refining in order to achieve desired paper properties, such as high strain at break and high tensile energy absorption at low airflow resistance. Conventional atmospheric high consistency refining is compared to treatments using two types of compressive screw equipment, Bivis equipment and the pressure expansion (PREX) plug screw feeder, commonly used in thermo mechanical pulp (TMP) plants. The plug screw pretreatments were performed under atmospheric and steam-pressurised conditions at 120°C and 130°C. Treatment in the Bivis equipment was performed under different compressive and shear conditions. After the Bivis and plug screw treatments, the pulp samples were refined in a low consistency process using the Escher-Wyss refiner. Paper properties were evaluated on freely dried sheets which were produced in order to simulate paper made under industrial sack paper drying conditions. The highest levels of the tensile energy absorption index and strain at break were achieved from curled and kinked fibres, pre-treated under the most compressive and highest shear stress conditions before low consistency refining. These results were obtained at very low airflow resistance, which is advantageous for sack paper, and with very low energy consumption during pre-treatment with the plug screw. The pulp samples pre-treated at high consistency in a plug screw feeder under steam-pressurised conditions or in the Bivis equipment showed, after low consistency refining, increased shrinking ability compared to the pulp samples pre-treated in high consistency refining under atmospheric conditions.

Place, publisher, year, edition, pages
2007. Vol. 22, no 1, p. 61-71
Keywords [en]
Airflow resistance, Bivis equipment, Fibre length, LC refining, Plug screw, Pressurised HC refining, Sack paper, Shape factor
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-4581DOI: 10.3183/NPPRJ-2007-22-01-p061-071ISI: 000248528700009Scopus ID: 2-s2.0-34247200586Local ID: 4865OAI: oai:DiVA.org:miun-4581DiVA, id: diva2:29613
Available from: 2008-09-30 Created: 2009-06-08 Last updated: 2017-12-12Bibliographically approved
In thesis
1. High Consistency Mechanical Treatment of Kraft Pulps under Steam Pressurised Conditions - Effects on Fibre and Sheet Properties
Open this publication in new window or tab >>High Consistency Mechanical Treatment of Kraft Pulps under Steam Pressurised Conditions - Effects on Fibre and Sheet Properties
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Sundsvall: Mittuniversitetet, 2007. p. 67
Series
Mid Sweden University doctoral thesis, ISSN 1652-893X ; 29
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-8891 (URN)978-91-85317-60-8 (ISBN)
Public defence
(English)
Available from: 2009-05-06 Created: 2009-05-06 Last updated: 2009-07-16Bibliographically approved

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Sjöberg, JessicaHöglund, Hans

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