miun.sePublications
Change search
Link to record
Permanent link

Direct link
BETA
Pettersson, Gunilla
Publications (10 of 20) Show all publications
Höglund, H., Pettersson, G., Norgren, S. & Engstrand, P. (2018). A paper or paperboard product comprising at least one ply containing high yield pulp and its production method. se 540115 C2.
Open this publication in new window or tab >>A paper or paperboard product comprising at least one ply containing high yield pulp and its production method
2018 (English)Patent (Other (popular science, discussion, etc.))
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:miun:diva-33506 (URN)
Patent
SE 540115 C2
Note

International application WO 2018054957 A1.

Available from: 2018-04-17 Created: 2018-04-17 Last updated: 2018-04-17Bibliographically approved
Samuelsson, T., Pettersson, G., Norgren, S., Svedberg, A., Höglund, H. & Engstrand, P. (2018). Development of strong and water resistant packaging materials from high yield pulps – fundamental aspects. In: IMPC 2018: . Paper presented at International Mechanical Pulping Conference (IMPC) 2018, May 27-30, 2018, Trondheim, Norway. Trondheim, Norway
Open this publication in new window or tab >>Development of strong and water resistant packaging materials from high yield pulps – fundamental aspects
Show others...
2018 (English)In: IMPC 2018, Trondheim, Norway, 2018Conference paper, Published paper (Refereed)
Abstract [en]

This work is focused on fundamental aspects of the densification of paper sheets during hot-pressing under conditions where the lignin in the fibre walls is softened. In this study light microscope and scanning electron microscope (SEM) techniques were used to reveal the mechanisms in the fibre network structure within the paper sheets that arises due to densification and the impact of lignin. UV and staining methods and spectrometric observations of the ultrastructure of cross section of paper sheets and fibre surfaces will highlight the changes that occur in the fibre structures. This study improves the understanding of how fibres collapse and how internal fibre-fibre bonds in lignin-rich mechanical pulp affect the physical properties of the final paper sheet. To demonstrate this, paper sheets from five different pulps containing different concentration of natural lignin were produced. Handsheets of 150 g/m2 were prepared in a Rapid Köthen (RK) laboratory sheet former, where the sheets were press-dried at 100 kPa and ca 90oC to a dry content of 45-50% d.c. After 24 hours in room temperature the hand sheets were hot-pressed in a temperature interval from 20 – 200oC at a constant pressure in a cylinder-press at a speed of 1 m/min. The results show that remarkable improvements on paper sheets, based lignin-rich pulps, can be achieved in terms of increased tensile index (up to 85 kNm/kg), compression strength, SCT, (up to 38 kNm/kg) and wet strength (up to 10 kNm/kg), which depends on the densification of the fibre structure at high temperature and pressure in the load nip. It is concluded that this to a major extent is related to that the lignin rich fibres are compressed at high enough temperature to both softened and develop tacky surfaces so that the fibres are locked into their positions within the highly densified sheets. The SEM evaluation shows how the surface structure get dense at pressing at 200oC for the CTMP based paper sheets. The light microscopy studies of the sheet cross sections reveal how the fibres collapse in the case of CTMP based sheets while fibres from bleached kraft pulp based sheets are quite well collapsed already at room temperature.

Place, publisher, year, edition, pages
Trondheim, Norway: , 2018
Keywords
ctmp, densification, hand sheets, hyp, lignin, mechanical pulp, nssc, strength properties, tmp, wet strength
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:miun:diva-34675 (URN)
Conference
International Mechanical Pulping Conference (IMPC) 2018, May 27-30, 2018, Trondheim, Norway
Available from: 2018-10-09 Created: 2018-10-09 Last updated: 2018-10-09Bibliographically approved
Nordin, T., Svedberg, A., Norgren, S., Pettersson, G. & Engstrand, P. (2018). Industrially Relevant In-situ Production Of High Yield Pulp Based Nanocellulose Materials Optimized To Improve Strength In Packaging And Printing Papers: A Comparison Between CMC And MFC As The Anionic Component In Layer-by-Layer Technology. In: IMPC 2018: . Paper presented at International Mechanical Pulping Conference (IMPC) 2018, May 27-30, 2018, Trondheim, Norway. Trondheim, Norway
Open this publication in new window or tab >>Industrially Relevant In-situ Production Of High Yield Pulp Based Nanocellulose Materials Optimized To Improve Strength In Packaging And Printing Papers: A Comparison Between CMC And MFC As The Anionic Component In Layer-by-Layer Technology
Show others...
2018 (English)In: IMPC 2018, Trondheim, Norway, 2018Conference paper, Published paper (Refereed)
Abstract [en]

A key issue in papermaking is to understand how to improve strength without losing other important quality measures, like paper bulk. This must of course also be done in a cost efficient way. The trials described in this paper show some different aspects related to the replacement of the expensive anionic component CMC (carboxymethylcellulose) often used in Layer-by-Layer technology together with cationic starch in order to improve strength properties as z-strength and tensile strength of typical chemi-thermomechanical pulp (CTMP) often used as dominating component in industrial scale paper board production. The replacement for CMC investigated here is a MFC (micro-fibrillated cellulose) as the anionic component and paper sheets has been produced on an experimental paper machine at MoRe Research AB. This MFC is a commercially available product and it has not been treated in ways of increasing charge density. The trials were performed at a small pilot scale experimental paper machine (XPM) at MoRe Research in Örnsköldsvik, Sweden. This XPM is equipped with a unique setup to perform Layer-by-Layer-tests under very well controlled conditions. The general conclusion is that it could, with further developments, be feasible to replace CMC with MFC to improve bonding in typical CTMP based paper sheets.

Place, publisher, year, edition, pages
Trondheim, Norway: , 2018
Keywords
cmc, ctmp, layer-by-layer, mechanical pulp, mfc, strength additive
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:miun:diva-34677 (URN)
Conference
International Mechanical Pulping Conference (IMPC) 2018, May 27-30, 2018, Trondheim, Norway
Available from: 2018-10-09 Created: 2018-10-09 Last updated: 2018-10-09Bibliographically approved
Norgren, S., Pettersson, G. & Höglund, H. (2018). Strong paper from spruce CTMP - Part II: Effect of pressing at nip press temperatures above the lignin softening temperature. Nordic Pulp & Paper Research Journal, 33(1), 142-149
Open this publication in new window or tab >>Strong paper from spruce CTMP - Part II: Effect of pressing at nip press temperatures above the lignin softening temperature
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. 

Keywords
adsorption, CMC, CTMP, heat, polyelectrolytes, pressure, starch, tensile index
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-34544 (URN)10.1515/npprj-2018-3009 (DOI)2-s2.0-85048028992 (Scopus ID)
Available from: 2018-09-27 Created: 2018-09-27 Last updated: 2018-09-27Bibliographically approved
Pettersson, G., Norgren, S. & Höglund, H. (2017). Strong paper from spruce CTMP - Part I. Nordic Pulp & Paper Research Journal, 32(1), 54-58
Open this publication in new window or tab >>Strong paper from spruce CTMP - Part I
2017 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 32, no 1, p. 54-58Article in journal (Refereed) Published
Abstract [en]

This study was carried out on sheets from spruce CTMP fibers, which are surface treated with a mix of cationic starch and CMC and blended with 20% bleach softwood chemical pulp fibers before handsheets were prepared in a Rapid Köthen sheet former, where the sheets were dried to 40-55% d.c. The sheets were pressed in a hot press nip in a pilot machine with adjustable pressure and heat. Both low and high nip pressure were used in combination with two different nip temperatures, 80°C and 100°C, to achieve sheets in a broad range of densities. The results show that remarkable improvements are possible, both in terms of tensile index (up to 85 kNm/kg) and compression strength, SCT, (up to 38 kNm/kg) on the CTMP-based sheets under optimal conditions at papermaking, i.e. consolidate the sheet structure in a press nip at evaluated temperatures. It is evident from the current study that there is an as of yet unexploited potential in modifying the conditions of papermaking from spruce CTMP furnishes, which can be utilized for the manufacturing of papers with high requirements on strength and stiffness, e.g. packaging papers.

Keywords
Adsorption, CMC, CTMP, Heat, Polyelectrolytes, Pressure, Starch, Tensile index
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-30664 (URN)10.3183/NPPRJ-2017-32-01-p054-058 (DOI)000398384400007 ()2-s2.0-85016441688 (Scopus ID)
Available from: 2017-04-26 Created: 2017-04-26 Last updated: 2017-06-09Bibliographically approved
Pettersson, G., Norgren, S., Höglund, H. & Engstrand, P. (2016). Low energy CTMP in strong and bulky paperboard plies. In: Paper Conference and Trade Show, PaperCon 2016: . Paper presented at Paper Conference and Trade Show, PaperCon 2016, 15 May 2016 through 18 May 2016, Cincinnati; United States (pp. 556-564). TAPPI Press, 1
Open this publication in new window or tab >>Low energy CTMP in strong and bulky paperboard plies
2016 (English)In: Paper Conference and Trade Show, PaperCon 2016, TAPPI Press, 2016, Vol. 1, p. 556-564Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
TAPPI Press, 2016
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-30112 (URN)2-s2.0-85010465464 (Scopus ID)9781510831193 (ISBN)
Conference
Paper Conference and Trade Show, PaperCon 2016, 15 May 2016 through 18 May 2016, Cincinnati; United States
Available from: 2017-02-14 Created: 2017-02-14 Last updated: 2017-02-14Bibliographically approved
Marais, A., Enarsson, L.-E., Pettersson, G., Lindström, T. & Wågberg, L. (2016). Pilot-scale papermaking using Layer-by-Layer treated fibres; Comparison between the effects of beating and of sequential addition of polymeric additives. Nordic Pulp & Paper Research Journal, 31(2), 308-314
Open this publication in new window or tab >>Pilot-scale papermaking using Layer-by-Layer treated fibres; Comparison between the effects of beating and of sequential addition of polymeric additives
Show others...
2016 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 31, no 2, p. 308-314Article in journal (Refereed) Published
Abstract [en]

The Layer-by-Layer (LbL) deposition technique was used to treat fibres before papermaking on a pilot scale. Following a laboratory pre-study performed earlier to determine the adsorption isotherms and the kinetics of formation of multilayers of polyamideamine epichlorydrine (PAE) and carboxymethylated cellulose (CMC) on unbeaten, bleached softwood fibres, online LbL treatment of the furnish was carried out on the EuroFEX pilot paper machine. Papers from fibres coated with up to four layers of polyelectrolytes were produced. Two different LbL systems were investigated, with anionic CMC in combination with either PAE or cationic starch (CS). The results showed that the mechanical strength of the paper significantly increased when the fibres were LbL-treated online. A comparison with conventional beating of the fibres revealed that the LbL treatment was a potential substitute to beating treatment, as the density of the LbL-treated papers remained constant while the mechanical properties were significantly improved. At the same time, the press solids content was significantly higher (2%) when using LbL-treated fibres than with beaten fibres.

Keywords
Layer-by-Layer, Paper Strength, Pilot-scale, Polyelectrolyte multilayers, Pulp fibres
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-28944 (URN)000378442300017 ()2-s2.0-84977485979 (Scopus ID)
Note

CODEN: NPPJE

Available from: 2016-09-27 Created: 2016-09-27 Last updated: 2017-11-21Bibliographically approved
Osong, S. H., Norgren, S., Pettersson, G., Engstrand, P., Còrdova, A., Afewerki, S. & Alimohammadzadeh, R. (2016). Processing of nanocellulose and applications relating to CTMP-based paperboard and foams. 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. 87-93). TAPPI Press
Open this publication in new window or tab >>Processing of nanocellulose and applications relating to CTMP-based paperboard and foams
Show others...
2016 (English)In: International Mechanical Pulping Conference 2016, IMPC 2016, TAPPI Press, 2016, p. 87-93Conference paper, Published paper (Refereed)
Abstract [en]

Although remarkable success has been made in the production of nanocellulose through several processing methods, it still remain a challenge to reduce the overall energy consumption, to use green chemistry and sustainable approach in order to make it feasible for industrial production of this novel nanomaterial. Herein, we have developed a new eco-friendly and sustainable approach to produce nanocellulose using organic acid combined with high-shear homogenisation, made hydrophobisation of nanocellulose and cross-linked the modified nanocellulosic material. Also, TEMPO-mediated oxidised nanocellulose was produced in order to compare the processing route with that of mild organic acid hydrolysis. Freeze-dried 3D structure of TEMPO-derived nanocellulose foam materials made fi-om bleached sulphite pulp and CTMP, respectively. Further, there is growing interest in using nanocellulose or microfibrillated cellulose (MFC) as an alternative paper sfrength additive in papermaking, and in using chemi-thermomechanical pulp (CTMP) with high freeness in producing CTMP-based paperboard with high bulk properties. To achieve greater strength improvement results, particularly for packaging paperboards, different proportions of cationic starch (CS) or MFC can be used to significantly improve the z-strength, with only a slight increase in sheet density. Research in this area is exploring CS or MFC as potential strength additives in CTMP-based paperboard, which is interesting from an industrial perspective. The mean grammage of the CTMP handsheets produced was approximately 150 g m~, and it was found that blending CTMP with CS or MFC yielded handsheets with significantly improved z-strength, tensile index, burst index and other strength properties at similar sheet densities.

Place, publisher, year, edition, pages
TAPPI Press, 2016
Keywords
Cationic starch, Chemi-thermomechanical pulp, Microfibrillated cellulose, Paperboard, Strength additive, TEMPO
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-29834 (URN)2-s2.0-85006448740 (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

Funding details: Mid Sweden University

Available from: 2017-01-09 Created: 2017-01-09 Last updated: 2017-01-09Bibliographically approved
Pettersson, G., Norgren, S. & Höglund, H. (2016). Strong paper from spruce CTMP. 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. 229-233). TAPPI Press
Open this publication in new window or tab >>Strong paper from spruce CTMP
2016 (English)In: International Mechanical Pulping Conference 2016, IMPC 2016, TAPPI Press, 2016, p. 229-233Conference paper, Published paper (Refereed)
Abstract [en]

This study was carried out on sheets from spruce CTMP fibers, which are surface treated with a mix of cationic starch and CMC and blended with 20% bleach softwood chemical pulp fibers before handsheets were prepared in a Rapid Kothen sheet former, where the sheets were dried to 40-55% d.c. The sheets were pressed in a hot press nip in a pilot machine with adjustable pressure and heat. Both low and high nip pressure were used in combination with two different nip temperatures, 80 °C and 100 °C, to achieve sheets in a broad range of densities. The results show that remarkable improvements are possible, both in terms of tensile index (up to 85 kNm/kg) and compression strength, SCT, (up to 38kNm/kg) on the CTMP-based sheets under optimal conditions at papermaking, i.e. consolidate the sheet structure in a press nip at evaluated temperatures. It is evident from the current study that there is an as of yet unexploited potential in modifying the conditions of papermaking from spruce CTMP furnishes, which can be utilized for the manufacturing of papers with high requirements on strength and stiffness, e.g. packaging papers.

Place, publisher, year, edition, pages
TAPPI Press, 2016
Keywords
CMC, CTMP, Heat, Polyelectrolytes, Pressure, Starch, Tensile index Adsorption
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-29836 (URN)2-s2.0-85006415447 (Scopus ID)9781510830738 (ISBN)
Conference
International Mechanical Pulping Conference 2016, IMPC 2016; Jacksonville; United States; 26 September 2016 through 28 September 2016
Available from: 2017-01-09 Created: 2017-01-09 Last updated: 2017-04-26Bibliographically approved
Pettersson, G., Höglund, H., Norgren, S., Sjöberg, J., Peng, F., Hallgren, H., . . . Solberg, D. (2015). Strong and bulky paperboard sheets from surface modified CTMP, manufactured at low energy. Nordic Pulp & Paper Research Journal, 30(2), 318-324
Open this publication in new window or tab >>Strong and bulky paperboard sheets from surface modified CTMP, manufactured at low energy
Show others...
2015 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 30, no 2, p. 318-324Article in journal (Refereed) Published
Abstract [en]

A description is given regarding methods used to manufacture strong and bulky sheets from furnishes based on a broad range of surface modified CTMP qualities. Starch and CMC are adsorbed on the fibre surfaces using a multilayer or a MIX concept. It is shown that both the in-plane and out-of-plane strength for the CTMP based sheets after such surface treatment can be more than doubled at a maintained density. This can be utilized to improve bending stiffness or to reduce the basis weight in multi-ply paperboards.

Keywords
CTMP, Starch, CMC, Multilayer, Paperboard, Strength properties
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-25692 (URN)000354806700018 ()2-s2.0-84945899503 (Scopus ID)
Available from: 2015-08-21 Created: 2015-08-18 Last updated: 2017-08-10Bibliographically approved
Organisations

Search in DiVA

Show all publications