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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
Sandberg, C., Berg, J.-E. & Engstrand, P. (2017). Low consistency refining of mechanical pulp - system design. TAPPI Journal, 16(7), 419-429
Open this publication in new window or tab >>Low consistency refining of mechanical pulp - system design
2017 (English)In: TAPPI Journal, ISSN 0734-1415, Vol. 16, no 7, p. 419-429Article in journal (Refereed) Published
Abstract [en]

Many mechanical pulping mills use low consistency (LC) refining for energy efficient fiber development. In this study, energy efficiency and pulp quality were evaluated for six processes, of which four included LC refining. We studied two different types of chip refiners - single disc (SD) and double disc (DD) - with LC refining in the main and reject lines. All process combinations have been used in the Holmen Paper Braviken mill, Sweden, to make thermomechanical pulp for printing papers. LC refining was more energy efficient than high consistency (HC) refining at certain tensile index increases in all evaluated combinations. LC refining in the main line had somewhat higher energy efficiency than did LC refining in the reject line. The type of chip refiner (DD or SD) did not affect the efficiency or pulp property development in LC refining. The process with a combination of DD chip refining and LC refining had the highest energy efficiency (tensile index at certain specific energy consumption). All processes with LC refining produced pulp with somewhat lower light scattering and fiber length than did the corresponding system with only HC refining. Thus, for printing papers, the best combination was LC refining with DD chip refining. LC refiners seem to have a narrow range in specific energy for maximum energy efficiency and a good balance between tensile index increase and fiber length reduction. Much higher specific energy was applied on reject pulp. However, the reject share was only around 30%. The LC refining specific energy, based on main line production, was around 80 kWh/air-dried metric ton (a.d. metric ton), whereas up to 180 kWh/a.d. metric ton was applied in main line.

National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-31894 (URN)000411860500005 ()2-s2.0-85026809547 (Scopus ID)
Available from: 2017-10-18 Created: 2017-10-18 Last updated: 2017-11-29Bibliographically approved
Nelsson, E., Paulsson, M., Sandberg, C., Svensson-Rundlöf, E. & Engstrand, P. (2017). Low dosage sulfite pretreatment at different refining temperatures in mill scale TMP production. Nordic Pulp & Paper Research Journal, 32(1), 59-69
Open this publication in new window or tab >>Low dosage sulfite pretreatment at different refining temperatures in mill scale TMP production
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2017 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 32, no 1, p. 59-69Article in journal (Refereed) Published
Abstract [en]

The effects of low dosage sodium sulfite ( Na2SO3) pretreatment (0, 0.6 and 1.2% on bone dry wood, pH 9) at two different refining temperatures (4.6 and 6.4 bar(g) refiner housing pressure) were evaluated for production of thermomechanical pulp with a double disc refiner in mill scale using Norway spruce wood at Braviken paper mill (Holmen Paper AB, Sweden). The sulfonate content of the pulps was not affected by the different refining temperatures and was 0.29% (as Na2SO3 equivalents) for the highest sulfite addition.

Tensile index at constant SEC was increased by 3.2 Nm/g when the refining temperature was increased, and by 8.6 Nm/g when 1.2% sodium sulfite was added. The effects were additive and led to an increase in tensile index of similar to 12 Nm/g at constant SEC when combined and would enable a reduction in SEC of 380 kWh/bdt (similar to 20%) to similar tensile index. The degree of delamination and internal fibrillation of the fibers was increased by both increased refining temperature and sulfite addition.

Pulp brightness was slightly reduced (<= 0.4% ISO) by increased refining temperature and increased (2-3% ISO), when sodium sulfite was added. Spectra of reflectance factors (360-740 nm) were used to study the optical properties of produced pulps.

Keywords
Double disc refining, Energy reduction, Mill scale, Norway spruce, Pulp properties, Refining temperature, Sulfite pretreatment, TMP
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-27332 (URN)10.3183/NPPRJ-2017-32-01-p059-069 (DOI)000398384400008 ()2-s2.0-85016434323 (Scopus ID)
Available from: 2016-03-24 Created: 2016-03-24 Last updated: 2017-12-18Bibliographically approved
Sandberg, C., Berg, J.-E. & Engstrand, P. (2017). Mill evaluation of an intensified mechanical pulping process. Nordic Pulp & Paper Research Journal, 32(2), 204-210
Open this publication in new window or tab >>Mill evaluation of an intensified mechanical pulping process
2017 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 32, no 2, p. 204-210Article in journal (Refereed) Published
Abstract [en]

Mill-scale demonstration of a process concept inspired by Process Intensification (PI) principles was performed in Holmen Paper Braviken mill, Norrkoping, Sweden. The intensified process consists of wood softening by means of chip pretreatment with sodium sulphite, high intensity refining followed by low consistency refining. This process yields very low shives content and thus the unit operations screening and reject refining can be eliminated and the pulp is fed directly to the paper machine. Thorough evaluation of key paper-and print quality data showed that it is possible to produce pulp for newsprint at 1500 kWh/adt total specific energy (including auxiliary drives such as pumps, screw feeders, etc.). The total specific energy consumption was 900 kWh/adt lower compared to the normal process used for newsprint in Braviken, and 500 kWh/adt lower compared to today's best available technology. The auxiliary equipment energy demand was 120 kWh/adt, which was less than half of that of the reference TMP line. The PIinspired process reduces the number of machines drastically compared to a conventional TMP line, as well as the number of pumps, chests and other auxiliary equipment.

Keywords
Chip pre-treatment, Double disc refining, Energy efficiency, High intensity, Low-consistency refining, Mechanical pulping, Process control, Process intensification, TMP
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-31366 (URN)10.3183/NPPRJ-2017-32-02-p204-210 (DOI)000405197000006 ()
Available from: 2017-08-10 Created: 2017-08-10 Last updated: 2017-11-29Bibliographically approved
Sandberg, C., Berg, J.-E. & Engstrand, P. (2017). Process intensification in mechanical pulping. Nordic Pulp & Paper Research Journal, 32(4), 615-622
Open this publication in new window or tab >>Process intensification in mechanical pulping
2017 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 32, no 4, p. 615-622Article in journal (Refereed) Published
Abstract [en]

Process intensification is a term used in the chemical process industry for major improvements in the process design leading to radical changes in process complexity, equipment size and efficiency. We suggest that a similar approach is applied in the pulp and paper industry. We have focused on the production of mechanical pulp, but a similar approach can be applied to other areas within the pulp and paper industry. Inspired by process intensification methodology, we suggest five principles for development of the mechanical pulping process. Three fundamental principles; 1. Break up the wood and fibre wall structure in the right positions. 2. Give each fibre, of certain morphology, the same processing experience. 3. Optimize the applied mechanical forces and the physiochemical state of the wood and fibre material.  and two system oriented principles; 1. Select wood raw material based on final product specifications. 2. Design the process to facilitate observability, controllability and maintenance. Implications of these principles on process design and future challenges for mechanical pulping are discussed.

Keywords
Energy efficiency, High intensity, Low consistency refining, Mechanical pulping, Process control, Process intensification, Softening, TMP
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:miun:diva-32571 (URN)10.3183/NPPRJ-2017-32-04-p615-622 (DOI)000418122100012 ()
Projects
e2mp, energy efficient mechanical pulping
Funder
Knowledge Foundation, 20100281Swedish Energy Agency, 32326-1
Available from: 2017-12-21 Created: 2017-12-21 Last updated: 2018-01-25Bibliographically approved
Afewerki, S., Alimohammadzadeh, R., Osong, S. H., Tai, C.-W., Engstrand, P. & Cordova, A. (2017). Sustainable Design for the Direct Fabrication and Highly Versatile Functionalization of Nanocelluloses. Global Challenges, 1(7), Article ID 1700045.
Open this publication in new window or tab >>Sustainable Design for the Direct Fabrication and Highly Versatile Functionalization of Nanocelluloses
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2017 (English)In: Global Challenges, ISSN 2056-6646, Vol. 1, no 7, article id 1700045Article in journal (Refereed) Published
Abstract [en]

This study describes a novel sustainable concept for the scalable direct fabrication and functionalization of nanocellulose from wood pulp with reduced energy consumption. A central concept is the use of metal-free small organic molecules as mediators and catalysts for the production and subsequent versatile surface engineering of the cellulosic nanomaterials via organocatalysis and click chemistry. Here, “organoclick” chemistry enables the selective functionalization of nanocelluloses with different organic molecules as well as the binding of palladium ions or nanoparticles. The nanocellulosic material is also shown to function as a sustainable support for heterogeneous catalysis in modern organic synthesis (e.g., Suzuki cross-coupling transformations in water). The reported strategy not only addresses obstacles and challenges for the future utilization of nanocellulose (e.g., low moisture resistance, the need for green chemistry, and energy-intensive production) but also enables new applications for nanocellulosic materials in different areas.

Place, publisher, year, edition, pages
Weinheim: Wiley-VCH Verlagsgesellschaft, 2017
Keywords
nanocellulose
National Category
Natural Sciences Engineering and Technology
Identifiers
urn:nbn:se:miun:diva-32620 (URN)10.1002/gch2.201700045 (DOI)000419793400002 ()
Funder
Swedish Research Council
Available from: 2017-12-24 Created: 2017-12-24 Last updated: 2018-03-23Bibliographically approved
Rahman, H., Lindström, M. E., Sandström, P., Salmen, L. & Engstrand, P. (2017). The effect of increased pulp yield using additives in the softwood kraft cook on the physical properties of low-grammage handsheets. Nordic Pulp & Paper Research Journal, 32(3), 317-323
Open this publication in new window or tab >>The effect of increased pulp yield using additives in the softwood kraft cook on the physical properties of low-grammage handsheets
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2017 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 32, no 3, p. 317-323Article in journal (Refereed) Published
Abstract [en]

The effect of increasing the pulp yield by the addition of sodium borohydride (NaBH4) or polysulfide (PS) in softwood kraft cooking, i.e. enhancing the retention of glucomannan, on the physical properties of low-grammage handsheets was studied. In addition to the yield improvement, an increase in tensile index was observed, especially at lower degrees of beating. These higher yield pulps showed an increase in pore volume, indicating an increased degree of swelling of the fibres. Presumably, the increased flexibility of the fibres affects the bonding strength and leads to the higher tensile index observed.

National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-31895 (URN)10.3183/NPPRJ-2017-32-03-p317-323 (DOI)000411768200001 ()
Available from: 2017-10-18 Created: 2017-10-18 Last updated: 2018-02-12Bibliographically approved
Engstrand, P. (2016). Energy efficient mechanical pulping – summary of the Scandinavian industry initiative research work 2011 - 2015. In: Robert Lanouette (Ed.), 2016 International Mechanical Pulping Conference, Jacksonville, Florida, USA  September 28-30, 2016: SESSION 11: INDUSTRY INITIATIVE FOR ENERGY REDUCTION. Paper presented at International Mechanical Pulping Conference 2016 (IMPC 2016) Jacksonville, Florida, USA 26 - 28 September 2016 (pp. 288-303). Georgia 30092 USA: TAPPI Press
Open this publication in new window or tab >>Energy efficient mechanical pulping – summary of the Scandinavian industry initiative research work 2011 - 2015
2016 (English)In: 2016 International Mechanical Pulping Conference, Jacksonville, Florida, USA  September 28-30, 2016: SESSION 11: INDUSTRY INITIATIVE FOR ENERGY REDUCTION / [ed] Robert Lanouette, Georgia 30092 USA: TAPPI Press, 2016, p. 288-303Conference paper, Published paper (Refereed)
Abstract [en]

A research program funded by the Swedish Energy Agency, the Swedish Knowledge Foundation and the Research Council of Norway was initiated by the companies; Holmen, Norske Skog, SCA and Stora Enso during 2008 with the objective to demonstrate techniques to reduce electrical energy demand by 50% for production of TMP and CTMP within a 10-year period starting 2011, while retaining similar final product characteristics of printing paper and paperboard. A gap analysis was performed to summarize different options to reach the goal at similar final product quality properties. The gap analysis indicated that some different approaches based on earlier research work both in pilot and demonstration scale together with improved process and product quality control should make it possible to reach the very tough goal. The very thorough benchmarking study was performed during 2012 including 16 TMP and CTMP-lines in Norway and Sweden showed the best production lines had the following electrical energy demands to certain final product properties; 900 kWh/t for CTMP optimized for paperboard, 1800 kWh/t for TMP optimized for newsprint and 2800 kWh/t for TMP optimized for SC-paper. The best results reached in industrial demonstration tests until 2015 showed potential to reduce the energy demand from 900 to 700 kWh/t for paperboard CTMP, from 1800 to 1400 kWh/t for newsprint TMP and from 2800 to 2400 for SC-paper TMP. In addition the results from other research within the program in the form of pilot and demonstration trials indicates that it could be possible to reach the goal of 50% reduced energy demand within a 10-year period provided that the industry and the research funds will continue to finance a continuation of the research program. 

Place, publisher, year, edition, pages
Georgia 30092 USA: TAPPI Press, 2016
Keywords
High yield pulping, mechanical pulping, chemimechanical pulping, energy reduction
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:miun:diva-29476 (URN)2-s2.0-85006489237 (Scopus ID)978-1-5108-3073-8 (ISBN)
Conference
International Mechanical Pulping Conference 2016 (IMPC 2016) Jacksonville, Florida, USA 26 - 28 September 2016
Projects
e2mp
Funder
Knowledge Foundation, 20100281Swedish Energy Agency, 2009-001882
Available from: 2016-12-07 Created: 2016-12-07 Last updated: 2017-02-07Bibliographically approved
Engstrand, P., Gradin, P., Hellström, L., Carlberg, T., Sandström, P., Liden, J., . . . Mats, E. (2016). Improved refining energy efficiency in thermo-mechanical pulping by means of collimated wood chipping – from solid mechanics to full scale evaluation. In: Greg Hay (Ed.), PaperWeek Canada 2016 Conference February 1 to 5, 2016, Montreal: Technical Track Program. Paper presented at PaperWeek Canada 2016 Conference, Montreal, February 1-5, 2016.
Open this publication in new window or tab >>Improved refining energy efficiency in thermo-mechanical pulping by means of collimated wood chipping – from solid mechanics to full scale evaluation
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2016 (English)In: PaperWeek Canada 2016 Conference February 1 to 5, 2016, Montreal: Technical Track Program / [ed] Greg Hay, 2016Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

The wood chipping process was never optimized with regard to high yield pulping processes as thermomechanical pulping (TMP) and chemithermomechanical pulping (CTMP). It is generally believed that wood chips for pulping should be produced in such a way that the degree of damage is minimized and that the chip dimensional distribution should be as narrow as possible. Since the TMP and CTMP processes were developed in the 60-ies and 70-ies, compression screw as well as roll nip equipment have been developed to pretreat wood chips as a way to reduce refining energy consumption to given fiber and pulp properties and also in order to improve impregnation. The general conclusions are that a combination of shear and compression in the tangential or radial direction of the wood initiates cracks that later in the refiner will enhance and optimize fiber separation and also fiber property development. The idea with the collimated chipping technology is to utilize the wood chipper as a tool, combining cutting of wood logs to wood chips with a pretreatment of the chips by creating cracks that would enhance fiber separation, fiber surface development as well as chip-impregnation. In this case the compression is performed in the wood fiber direction, in which direction wood actually is weakest when it comes to compression induced cracking. The maximization of the amount of cracks in wood-chips is performed by optimizing the knife angle (or spout angle) in the chipper, to what we call collimated chipping (according to a patent owned by CCT AB). This presentation describes a theoretical background and two demonstration scale studies performed by SCA Forest Products at their Ortviken mill. One conclusion drawn, based on two-month test period with three weeks of collimated chipping, was that specific refining energy reduction was around 100 kWh/adt of the 1400 kWh/adt used in primary stage double disc refining. Most probably the potential is higher if the whole system is optimized. Tests were performed at constant production rate and energy was reduced by reducing power to constant freeness, leading to similar tensile and light scattering levels. The deliberately increased forces created in the wood chipper by means of an optimized (increased) edge angle caused more problems with knife holder equipment than normally, as well as increased vibrations. These problems will have to be solved for future long-term implementation of the technique.

Keywords
chipping, mechanical pulping, energy reduction
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:miun:diva-29474 (URN)
Conference
PaperWeek Canada 2016 Conference, Montreal, February 1-5, 2016
Projects
e2mp forskningsprofil
Funder
Knowledge Foundation, 2010/0178VINNOVA, 2012-00786
Available from: 2016-12-07 Created: 2016-12-07 Last updated: 2017-02-07Bibliographically 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
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-1881-6473

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