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Low dosage sulfite pretreatment in a modern TMP-line

Nelsson, Erik and Sandberg, Christer and Svensson-Rundlöf, Eva and Engstrand, Per and Fernando, Dinesh and Daniel, Geoffrey (2015). Low dosage sulfite pretreatment in a modern TMP-line. Nordic pulp & paper research journal. 30 :4 , 591-598
[Research article]

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The effects of low dosage sulfite pretreatment combined with modern high consistency double disc refining were evaluated for production of thermomechanical pulp in a mill scale trial using Norway spruce wood at the Braviken paper mill (Holmen Paper AB, Sweden). Spruce wood chips were mechanically pretreated in an Impressafiner before impregnation with different dosages (0-1.2%) of sodium sulfite (Na2SO3) at pH 9. Approximately 23% of the added sulfite was converted to sulfonate groups in pulp, resulting in a sulfonate content of 0-0.28% (as Na2SO3). The low dosage sulfite addition increased tensile index, elongation, density, brightness and decreased shive content, light scattering and light absorption coefficients when compared at equal specific energy consumption (SEC). The increase in tensile index was proportional to dosage of sulfite. Further analyses showed that low dosage sulfite addition did not affect the distribution of the Bauer-McNett fractions nor the fibre length for pulps refined with equal SEC. However, the low dosage sulfite addition increased fibre delamination/internal fibrillation (D/IF). With the addition of 1.2% Na2SO3, it was possible to produce pulp with a tensile index of 47 Nm/g using ~320 kWh/bdt (~15%) lower refining energy, compared with pulps produced without sulfite addition.

Authors/Creators:Nelsson, Erik and Sandberg, Christer and Svensson-Rundlöf, Eva and Engstrand, Per and Fernando, Dinesh and Daniel, Geoffrey
Title:Low dosage sulfite pretreatment in a modern TMP-line
Series Name/Journal:Nordic pulp & paper research journal
Year of publishing :2015
Page range:591-598
Number of Pages:8
Publisher:Swedish Association of Pulp and Paper Engineers
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Wood Science
Agrovoc terms:pulp and paper industry
Keywords:Chip pre-treatment, Double disc refining, Energy reduction, Impressafiner, Low dosage, Mill scale, Norway spruce, Pulp properties, Sulfite, TMP
Permanent URL:
Additional ID:
Type of IDID
Web of Science (WoS)000366040300006
Alternative URL:http://www.npprj.se/html/np-viewarticleabstract.asp?m=10073∓=756
ID Code:13406
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Forest Products (until 180101)
Deposited By: SLUpub Connector
Deposited On:14 Jul 2016 08:37
Metadata Last Modified:09 Sep 2020 14:17

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