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Mill scale production of TMP with double disk refining-The effects of a mild sulfonation, atmospheric preheating and refining temperatures
Holmen AB, New Business Development.
Holmen Paper AB, Paper Product Developmen.
Holmen Paper AB, Paper Product Developmen.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering. Akzo Nobel Pulp and Perfomtance Chemicals AB.
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2016 (English)In: International Mechanical Pulping Conference 2016, IMPC 2016, TAPPI Press, 2016, 249-259 p.Conference paper (Refereed)
Abstract [en]

The aim of this work was to study the effects of a mild dosage of sodium sulfite in chip impregnation at diffen temperatures during atmospheric preheating and during refining for production of TMP for printing papers usi high intensity double disk refining. Two trials were performed in the 800 bdt/day double disc line at I Braviken paper mill (Holmen Paper AB, Sweden) using Norway spruce chips. During the trials, chips w( impregnated in an Impressafiner where chips were preheated at 1.8 bar(g) for a few seconds and th compressed before impregnation. During impregnation, sodium sulfite was added to chips at pH 9 in dosages 0.6 or 1.2%. Reference pulps without addition of sulfite were also produced. In the first trial, the effect different temperatures and retention times (80°C for 6 minutes vs. 96°C for 9 minutes) in the atmosphe preheating bin following impregnation was evaluated both with and without the addition of 1.2% sodium sulf In the second trial, the effect of different refining temperatures (refiner house pressures of 4.6 or 6.4 bar(g), 1 or 167°C) was evaluated with different additions of sodium sulfite (0.0, 0.6 or 1,2%) during impregnation. The results from the two trials showed that the increase in refiner house pressure increased the tensile index pulps both with and without addition of sodium sulfite, when compared at certain SEC. However, the increase preheater bin temperature and retention time did not increase the tensile index of pulps but rather led to a sm reduction in tensile index when combined with an addition of 1.2% sodium sulfite. The two different methc used to increase the temperature in the system led to different effects in the disc gap at certain SEC. The disc j temperature was increased by both methods but disc gap was only reduced at certain SEC when the refini temperature was increased by increasing the refiner housing pressure. The difference in the effect on the disc j may hold the answer to the different effects seen in tensile index.

Place, publisher, year, edition, pages
TAPPI Press, 2016. 249-259 p.
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-29835ScopusID: 2-s2.0-85006384917ISBN: 978-151083073-8 OAI: oai:DiVA.org:miun-29835DiVA: diva2:1063034
Conference
International Mechanical Pulping Conference 2016, IMPC 2016; Jacksonville; United States; 26 September 2016 through 28 September 2016
Note

Conference Paper

Available from: 2017-01-09 Created: 2017-01-09 Last updated: 2017-02-07Bibliographically approved

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Paulsson, MagnusGranfeldt, ThomasEngberg, BirgittaEngstrand, Per
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