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Fibre-based strength aids for increased board stiffness
RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.ORCID iD: 0000-0003-0385-6202
RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
Holmen AB, Sweden.
2019 (English)In: PaperCon 2019: proceedings, TAPPI Press, 2019, article id PF2.3Conference paper, Published paper (Other academic)
Abstract [en]

A pilot scale study has been made of the concept of adding fibre-based strength agents (fines enriched (FE)-pulp or highly refined (HR)-pulp) in a board middle ply containing chemithermomechanical bleached pulp (CTMP) in order to increase bending stiffness of the board while maintaining Z-strength. It has been demonstrated that the bending stiffness of a sheet consisting of a top ply and a CTMP based middle ply could be improved by increasing the CTMP fraction and preventing Z-strength loss via addition of a fibre based strength agent. Compared with the reference pulp, both Z-strength and bulk increased for three of the compositions, namely 65% CTMP with 5% strength agent of either FE or HR type and 85% CTMP with 10% HR-pulp. FE-pulp was found to be more efficient than HR-pulp concerning bending stiffness improvement. While the highly-refined fibres of the strength agents had a negative effect on the drainage resistance and press dryness, an increased share of CTMP increased the press dryness linearly. FE-pulp and HR-pulp had the same impact on press dryness. Press solids could be improved by approximately 2% without significantly reducing the bulk by increasing press loads.

Place, publisher, year, edition, pages
TAPPI Press, 2019. article id PF2.3
Keywords [en]
board making, chemithermomechanical pulp, strength properties, fines, refining, board properties, bending stiffness
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:ri:diva-43248OAI: oai:DiVA.org:ri-43248DiVA, id: diva2:1385797
Conference
PaperCon 2019. Proceedings of a conference held in Indianapolis, Indiana, USA, 5-8 May 2019
Available from: 2020-01-15 Created: 2020-01-15 Last updated: 2020-01-20Bibliographically approved

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Björk, Elisabeth

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CiteExportLink to record
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