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Strong paper from spruce CTMP - Part II: Effect of pressing at nip press temperatures above the lignin softening temperature
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
2018 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 33, no 1, p. 142-149Article in journal (Refereed) Published
Abstract [en]

The main objective of the current study was to demonstrate that it is possible to enhance strength properties of sheets from spruce HT-CTMP and CTMP furnishes up to the same level as is common on sheets from softwood kraft pulps by changing conditions in papermaking. To achieve that, sheets of spruce HT-CTMP and CTMP were consolidated at densities close to that of the reference bleach kraft pulp by pressing at press nip temperatures well above the tack and softening temperatures of lignin. On sheets from spruce CTMP (CSF 420 ml), where the fibers were surface treated with cationic starch, it was possible to reach tensile index at the same level as on sheets from the untreated reference kraft pulp. The compression strength (SCT) of CTMP and HT-CTMP sheets, which were achieved at the highest press nip temperature (200 °C) in the study, was equal to or higher than that of the reference kraft pulp sheets. The results show that there is a great yet unexploited potential in papermaking from spruce HT-CTMP and CTMP furnishes, which could be utilized in manufacturing of products where very high requirements upon strength is demanded. 

Place, publisher, year, edition, pages
2018. Vol. 33, no 1, p. 142-149
Keywords [en]
adsorption, CMC, CTMP, heat, polyelectrolytes, pressure, starch, tensile index
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-34544DOI: 10.1515/npprj-2018-3009ISI: 000450919200016Scopus ID: 2-s2.0-85048028992OAI: oai:DiVA.org:miun-34544DiVA, id: diva2:1251477
Available from: 2018-09-27 Created: 2018-09-27 Last updated: 2019-08-06Bibliographically approved

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Norgren, SvenPettersson, GunillaHöglund, Hans

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