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Paulsson, Magnus
Publications (10 of 28) Show all publications
Engstrand, P., Ferritsius, R., Rundlöf, M. & Paulsson, M. (2019). Decrease in strengthalong a process line for SC paper. In: Fundamental Mechanical Pulp Research Seminar, FMPRS2019, Norrköping, SwedenArranged by Mid Sweden University in cooperatrion with Holmen AB, Valmet AB, AF AB and Treesearch.: . Paper presented at Fundamental Mechanical Pulp Research Seminar, FMPRS2019, Norrköping Sweden.
Open this publication in new window or tab >>Decrease in strengthalong a process line for SC paper
2019 (English)In: Fundamental Mechanical Pulp Research Seminar, FMPRS2019, Norrköping, SwedenArranged by Mid Sweden University in cooperatrion with Holmen AB, Valmet AB, AF AB and Treesearch., 2019Conference paper, Oral presentation with published abstract (Refereed)
Keywords
Mechancial Pulp, Printing Paper, Extractives, Bleaching, Strength Properties
National Category
Engineering and Technology
Identifiers
urn:nbn:se:miun:diva-38045 (URN)
Conference
Fundamental Mechanical Pulp Research Seminar, FMPRS2019, Norrköping Sweden
Funder
Swedish Energy Agency, P42365-1
Available from: 2019-12-12 Created: 2019-12-12 Last updated: 2020-01-15Bibliographically approved
Hellström, P., Heijnesson-Hulten, A., Paulsson, M., Hakansson, H. & Germgard, U. (2016). A comparative study of enzymatic and Fenton pretreatment applied to a birch kraft pulp used for MFC production in a pilot scale high-pressure homogenizer. TAPPI Journal, 15(6), 375-381
Open this publication in new window or tab >>A comparative study of enzymatic and Fenton pretreatment applied to a birch kraft pulp used for MFC production in a pilot scale high-pressure homogenizer
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2016 (English)In: TAPPI Journal, ISSN 0734-1415, Vol. 15, no 6, p. 375-381Article in journal (Refereed) Published
Abstract [en]

Microfibrillated cellulose (MFC) was produced in pilot scale from a bleached birch (Betula verrucosa) kraft pulp that was pretreated with either Fenton's reagent or with a combined mechanical and enzymatic method used at the Centre Technique du Papier (CTP; Grenoble, France). The change in fiber fibrillation during the homogenization treatment was monitored by analyzing the fiber and the fines content, size fractionation, rheological properties and visualization by light-and scanning electron microscopy (SEM). The Fenton pretreatment resulted in MFC suspensions that contained a high amount of small sized elements. After five passes through the high-pressure homogenizer, the amount of particles smaller than 20 mu m was 37% for the Fenton pretreated MFC compared to 13% for the enzymatically (endoglucanase) pretreated MFC. Altogether, the Fenton pretreatment enabled preparation of MFC with a higher degree of fibrillation after the same number of passes through the high-pressure homogenizer. Another option is to produce MFC of the same amount of fibrillation as after an enzymatic stage, but at significantly lower energy consumption.

National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-28908 (URN)000380267900004 ()2-s2.0-84978419554 (Scopus ID)
Available from: 2016-09-27 Created: 2016-09-26 Last updated: 2017-11-21Bibliographically approved
Nelsson, E., Sandberg, C., Svensson-Rundlöf, E., Paulsson, M., Granfeldt, T., Engberg, B. & Engstrand, P. (2016). Mill scale production of TMP with double disk refining-The effects of a mild sulfonation, atmospheric preheating and refining temperatures. In: International Mechanical Pulping Conference 2016, IMPC 2016: . Paper presented at International Mechanical Pulping Conference 2016, IMPC 2016; Jacksonville; United States; 26 September 2016 through 28 September 2016 (pp. 249-259). TAPPI Press
Open this publication in new window or tab >>Mill scale production of TMP with double disk refining-The effects of a mild sulfonation, atmospheric preheating and refining temperatures
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2016 (English)In: International Mechanical Pulping Conference 2016, IMPC 2016, TAPPI Press, 2016, p. 249-259Conference paper, Published 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
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-29835 (URN)2-s2.0-85006384917 (Scopus ID)978-151083073-8 (ISBN)
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
Enberg, S., Opdal, Ø., Axelsson, P., Eriksen, Ø., Rundlöf, M. & Paulsson, M. (2015). Mapping and modelling of optical properties from pulp to super calendered paper. Appita journal, 68(2), 128-138
Open this publication in new window or tab >>Mapping and modelling of optical properties from pulp to super calendered paper
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2015 (English)In: Appita journal, ISSN 1038-6807, Vol. 68, no 2, p. 128-138-Article, review/survey (Refereed) Published
Abstract [en]

During production of mechanical pulp based paper, the pulp darkenswithin the process which represents a significant cost for the mill. Amapping of the optical properties of the pulp was conducted along theprocess, from pulp mill to paper machine, at a mill producing supercalendered (SC) paper on three paper machines. The focus was to evaluateat which positions in the mill the discolouration occurs and also whichfraction of the pulp darkens the most.The fine fraction of the pulp darkened more than the long fibrefraction. Bleached pulp diluted with white water from the paper machinedarkened more during storage than pulp diluted with clear filtrate. Thewhite water contains a considerable amount of suspended solids, i.e.pulp fines and clay. There was a tendency for a shoulder in absorptionspectra of the pulp stored in white water from the paper machine in theregion 550 to 650 nm, both for fibres and for fines. This is in the sameregion where the added dyes have their absorption maxima and also somecomplexes between iron and some of the components among lignin and theextractives. Simulation of retention times of different fractions showedthat, although the main part of the fine material is retained in thepaper within a few hours, a small part might circulate for considerablylonger time.

Keywords
Mechanical pulp, Mill mapping, Optical properties, Pulp fractions, Simulation, Storage
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:miun:diva-23804 (URN)000355069600019 ()
Available from: 2014-12-16 Created: 2014-12-16 Last updated: 2017-12-05Bibliographically approved
Walter, K., Paulsson, M. & Engstrand, P. (2014). Acid Hydrogen Peroxide Treatment of Norway Spruce TMP: The Effect of an Extended pH Range when Catalyzed by Free Ferrous and Free or EDG/EDTA-Chelated Ferric Ions. Journal of wood chemistry and technology, 34(2), 135-155
Open this publication in new window or tab >>Acid Hydrogen Peroxide Treatment of Norway Spruce TMP: The Effect of an Extended pH Range when Catalyzed by Free Ferrous and Free or EDG/EDTA-Chelated Ferric Ions
2014 (English)In: Journal of wood chemistry and technology, ISSN 0277-3813, E-ISSN 1532-2319, Vol. 34, no 2, p. 135-155Article in journal (Refereed) Published
Abstract [en]

The influence of different types of iron salts (i.e., ferrous or ferric cations with sulphate, nitrate or chloride anions) on the reaction between coarse thermomechanical pulp and acid hydrogen peroxide (Fenton chemistry) was studied when the initial pH was 3.2 and 5.3. Also, ferric ions chelated with EDTA or EDG at different molar ratios were compared with ferrous sulphate when the initial pH was extended from about 3 to 8. Different anions of ferric ion salt gave a similar catalytic effect. At an initial pH of 7–8, the ferric-EDTA catalyzed reaction resulted in similar or higher hydrogen peroxide consumption and more detectable hydroxyl radicals than the ferrous sulphate catalyzed reaction, but less reaction with the pulp was indicated. Between pH 5–8, using Fe-EDG as a catalyst gave higher hydrogen peroxide consumption and more detectable hydroxyl radicals than if using ferrous sulphate; however, the measured effect on the pulp was similar or less.

Keywords
Hydrogen peroxide, TMP, Fenton's reagent, hydroxyl radicals, ferrous, ferric, sulphate, nitrate, chloride, EDTA, EDG, TOC, total fiber charge
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-20729 (URN)10.1080/02773813.2013.844166 (DOI)000328465700005 ()2-s2.0-84890598506 (Scopus ID)
Available from: 2013-12-16 Created: 2013-12-16 Last updated: 2017-12-06Bibliographically approved
Walter, K., Paulsson, M. & Engstrand, P. (2014). Acid hydrogen peroxide treatment of Norway spruce TMP: The effect of chelated ferric ions. In: International Mechanical Pulping Conference, IMPC 2014: . Paper presented at International Mechanical Pulping Conference, IMPC 2014; Helsinki; Finland; 2 June 2014 through 5 June 2014; Code 109275. Paper Engineer's Association (PI)
Open this publication in new window or tab >>Acid hydrogen peroxide treatment of Norway spruce TMP: The effect of chelated ferric ions
2014 (English)In: International Mechanical Pulping Conference, IMPC 2014, Paper Engineer's Association (PI) , 2014Conference paper, Published paper (Refereed)
Abstract [en]

The effect of treating thermomechanical pulp with Fenton chemistry was evaluated in a model study. Ferrous ions and chelated ferric ions were compared as catalysts while initial pH was varied. The results showed that a catalyst of ferrous sulphate had a greater impact on the pulp (increased total fibre charge and carbonyl groups, more dissolved organic material in filtrate) than ferric ions chelated with EDTA. If using ferric-EDG as catalyst, the hydrogen peroxide consumption was higher and more hydroxyl radicals were detected compared to if using ferrous sulphate. Ferric-EDG, however, gave similar or less effect on the pulp.

Place, publisher, year, edition, pages
Paper Engineer's Association (PI), 2014
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-24077 (URN)2-s2.0-84923974861 (Scopus ID)9780000000002 (ISBN)
Conference
International Mechanical Pulping Conference, IMPC 2014; Helsinki; Finland; 2 June 2014 through 5 June 2014; Code 109275
Note

Export Date: 7 January 2015

Available from: 2015-01-08 Created: 2015-01-07 Last updated: 2015-08-12Bibliographically approved
Salmen, L., Viforr, S., Mårtensson, T., Sixta, H., Ylönen, T., Fernando, D., . . . Back, R. (2014). Enzymatic chip treatment for TMP - Prospects. In: International Mechanical Pulping Conference, IMPC 2014: . Paper presented at International Mechanical Pulping Conference, IMPC 2014; Helsinki; Finland; 2 June 2014 through 5 June 2014; Code 109275.
Open this publication in new window or tab >>Enzymatic chip treatment for TMP - Prospects
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2014 (English)In: International Mechanical Pulping Conference, IMPC 2014, 2014Conference paper, Published paper (Refereed)
Abstract [en]

In order to evaluate enzyme pre-treatments of chips as means of lowering the energy demand in mechanical pulping, impregnation and refining trials were performed. Wing refining showed that property development was similar to that of reference pulps in the case of pectinase and xylanase while for chips treated with mannanase a less favourable development of the tensile index was noted. Considering the highly increased possibility for enzymatic interactions reached with greater disintegration of chips it could well be that the possibilities for enzymes to attack desired fibre wall structures may have been too few even in the case of Impressafiner treated material used here.

National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-24071 (URN)2-s2.0-84923974826 (Scopus ID)9780000000002 (ISBN)
Conference
International Mechanical Pulping Conference, IMPC 2014; Helsinki; Finland; 2 June 2014 through 5 June 2014; Code 109275
Note

Export Date: 7 January 2015

Available from: 2015-01-08 Created: 2015-01-07 Last updated: 2015-08-12Bibliographically approved
Hellström, P., Heijnesson-Hultén, A., Paulsson, M., Håkansson, H. & Germgård, U. (2014). Fenton pre-treated microfibrillated cellulose evaluated as a strength enhancer in the middle ply of paperboard. Nordic Pulp & Paper Research Journal, 29(4), 732-740
Open this publication in new window or tab >>Fenton pre-treated microfibrillated cellulose evaluated as a strength enhancer in the middle ply of paperboard
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2014 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 29, no 4, p. 732-740Article in journal (Refereed) Published
Abstract [en]

Microfibrillated celluloses (MFCs), produced by various pre-treatments of a fully bleached birch kraft pulp, were evaluated as strength enhancers in test sheets representing the middle ply of paperboard. The furnish consisted of hydrogen peroxide bleached high temperature spruce chemithermomechanical pulp (HT-CTMP), MFC and a retention system containing cationic starch and an anionic silica sol. The MFC was prepared via a mechanical treatment in a colloid mill after pretreatment with Fenton's reagent, monocomponent endoglucanase or acidic hydrogen peroxide. Addition of 5% MFC, produced with Fenton pre-treatment, resulted in improved HT-CTMP properties with respect to increased tensile index (similar to 35%), z-directional strength (similar to 50%), tensile stiffness index (similar to 25%) compared to HT-CTMP test sheets prepared without MFC addition. The strength improvement was linearly correlated to the density of the tests sheet, to the surface area (BET) and to the surface charge of the enzymatic or chemically pre-treated MFCs.

Keywords
Microfibrillated cellulose, Fenton's reagent, Enzymatic hydrolysis, Tensile strength, Z-directional strength, Bending stiffness index, Bending resistance, Dewatering
National Category
Chemical Engineering Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:miun:diva-24271 (URN)000346146900020 ()2-s2.0-84914818234 (Scopus ID)
Available from: 2015-02-03 Created: 2015-02-03 Last updated: 2017-08-10Bibliographically approved
Enberg, S., Rundlöf, M., Paulsson, M., Axelsson, P., Eriksen, O. & Engstrand, P. (2014). Some causes of formation of colour during storage of hydrogen-peroxide bleached Norway spruce mechanical pulp. Nordic Pulp & Paper Research Journal, 29(2), 356-366
Open this publication in new window or tab >>Some causes of formation of colour during storage of hydrogen-peroxide bleached Norway spruce mechanical pulp
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2014 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 29, no 2, p. 356-366Article in journal (Refereed) Published
Abstract [en]

The discolouration of hydrogen-peroxide bleached Norway spruce mechanical pulp during storage in mill systems was studied and the contributions of process water, iron and dyes were evaluated over the visible spectrum. Washing of the pulp made it less sensitive to storage, possibly due to the removal of extractives, lignin-like substances, iron and pulp fines. Storage in white water gave extensive discolouration with a shoulder in the absorption spectrum at around 550-650 nm. Most of the colour was associated with pulp fines or filler but some colour was also found in smaller fractions and in the water phase. The addition of ferric ions increased the light absorption coefficient during storage, initially at short wavelengths and then over the whole spectrum, but could not explain the increased absorption at 550-650 nm and could not be the only cause of the darkening in the mill system. A cationic basic violet dye gave a shoulder in the absorption spectrum similar to that in the mill system, but the absorption in this area did not increase during storage. Model calculations indicate that ferric ions together with violet and red dyes could explain a major part, but not all, of the colour observed in the mill system after storage. The darkening not accounted for at longer wavelengths and around 550-650 nm is suggested to be related to fines and fillers including dissolved and colloidal substances associated with these particles.

Keywords
Colour, Dye, Iron, Mechanical pulp, Pulp storage, Optical properties, Spectral data
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-22589 (URN)000338336400021 ()
Available from: 2014-08-20 Created: 2014-08-19 Last updated: 2017-08-10Bibliographically approved
Karlsson, A., Paulsson, M., Engstrand, P. & Hedenström, E. (2014). Strategies to reduce heat-induced darkening for enhanced bleachability of mechanical pulps. Appita journal, 67(1), 50-57
Open this publication in new window or tab >>Strategies to reduce heat-induced darkening for enhanced bleachability of mechanical pulps
2014 (English)In: Appita journal, ISSN 1038-6807, Vol. 67, no 1, p. 50-57Article in journal (Refereed) Published
Abstract [en]

Under mechanical pulping conditions, elevated temperature initiates reactions in the wood constituents resulting in the formation of coloured structures. In an attempt to reduce the formation of colour, a number of additives have been examined to assess their ability to inhibit heat-induced darkening of a Norway spruce (Picea abies) stone groundwood (SGW) pulp. SGW pulp was used as a model pulp with the purpose of imitating a thermomechanical pulp (IMP). The heat-treated SGW pulp, both with and without additives present, was subsequently bleached with 4.5% hydrogen peroxide at high pulp consistency and with varying alkali charges in order to examine the hydrogen peroxide bleachability of such pulps. Heat treatment at 170 °C resulted in a loss of brightness of about 4% ISO after heating for 60 seconds. The reduction in brightness could only partly be regained through high consistency hydrogen peroxide bleaching; the SGW pulp displayed a brightness of 83.7% ISO whereas the heat-treated SGW pulp reached a brightness of 80.4% ISO. Heat treatment with a low addition rate (1 %) of alkaline hydrogen peroxide, sodium bisulfite or sodium sulfite, with a subsequent hydrogen peroxide bleaching stage, resulted in an improved bleached brightness of about 81.6% ISO, i.e. the loss of brightness due to heat was still approximately 2% ISO. Sodium borohydride (1 %) did not suppress the thermal darkening but improved the bleached brightness by approximately 2% ISO compared to the heat-treated SGW pulp and resulted in a brightness of 82.6% ISO. Addition of a chelating agent (DTPA, 0.11 and 0.45%) and the radical scavengers phthalic hydrazide (1 %) and 1 -hexanol (1 %) suppressed the heat-induced darkening somewhat but did not improve the hydrogen peroxide bleachability to any noticeable extent. Addition of citric acid (0.6%) did not suppress the thermal darkening and resulted in impaired bleachability.

Keywords
Bleaching, Brightness, Hydrogen peroxide, Light absorption, Light scattering, Mechanical pulps, Temperature
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-20980 (URN)000342037800014 ()2-s2.0-84901988527 (Scopus ID)
Available from: 2014-01-08 Created: 2014-01-08 Last updated: 2017-12-06Bibliographically approved
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