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Publications (10 of 11) Show all publications
Odeberg Glasenapp, A., Alfthan, J., Salmen, L., Stevanic Srndovic, J., Björk, E., Holmqvist, C., . . . Berthold, J. (2019). Next level of corrugated board research. In: 29th IAPRI Symposium on packaging, 2019: Serving society innovative perspectives on packaging. Paper presented at 29th IAPRI Symposium on packaging, 11-14 June, 2019, Enschede, The Netherlands.
Open this publication in new window or tab >>Next level of corrugated board research
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2019 (English)In: 29th IAPRI Symposium on packaging, 2019: Serving society innovative perspectives on packaging, 2019Conference paper, Published paper (Other academic)
Abstract [en]

 For the first time in the Bioeconomy research program at RISE, corrugatedboard has an own research area. Research is building around the main driving forcesin the corrugated board value chain like e-commerce, improved box performance anddigital printing. The main weakness of corrugated board, its moisture sensitivity, isalso addressed.These main driving forces and weaknesses of corrugated board are mirrored in thethemes of this large research program area:Fibre sorption and deformation mechanismsFundamental knowledge on the mechanisms behind moisture sorption and deformation on fibre level is developed to increase moisture and creep resistance throughmodification of paper materials. State of the art methods for characterization ofthe fibre ultra- and nano-structure such as Fourier transform infra-red spectroscopy(FTIR), small angle X-ray scattering (SAXS), and wide angle X-ray scattering (WAXS)give new insights on mechanisms and clarify effects of moisture as well as chemicalmodifications.Papermaking for improved base sheetsConcepts that are explored are fibre-based strength additives produced with novelrefining techniques, and modified ZD-profiles in the sheet for better mechanical properties.Box mechanicsMechanical performance of structures such as corrugated board boxes can be predicted through physically based mathematical modelling by taking the behaviour ofthe constituent materials as well as the geometry into account. Appropriate materialmodels for the corrugated board are identified and finite element models for simulation of corrugated board packaging performance are developed.Tool for inkjet printability on corrugatedThere is a genuine need for improved inkjet printability on corrugated materials thanksto rapid development in e-commerce as well as digitalization along the corrugatedvalue chain. Effective measurement methods and knowledge around ink-substrateinteractions are developed to enable board producers and converters to have effective product development and predictable printability on not only liners but also oncorrugated materials.

Keywords
corrugated board, moisture, box mechanics, inkjet printing, fibre sorption
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-39737 (URN)
Conference
29th IAPRI Symposium on packaging, 11-14 June, 2019, Enschede, The Netherlands
Available from: 2019-08-14 Created: 2019-08-14 Last updated: 2019-08-15Bibliographically approved
Björk, E., Bouveng, M. & Vomhoff, H. (2018). Fines-enriched pulp as a strength agent in a CTMP middle ply. In: PaperCon 2018: Shaping the future through innovation. Paper presented at TAPPI Paper Conference and Trade Show, PaperCon 2018; Charlotte; United States; 15 April 2018 through 18 April 2018 (pp. 741-760). TAPPI, Article ID PA5.2.
Open this publication in new window or tab >>Fines-enriched pulp as a strength agent in a CTMP middle ply
2018 (English)In: PaperCon 2018: Shaping the future through innovation, TAPPI , 2018, p. 741-760, article id PA5.2Conference paper, Published paper (Refereed)
Abstract [en]

The objective of this pilot scale trial, was to evaluate fines-enriched pulp (FE-pulp) as a strength agent in amiddle ply of a board product.A typical CTMP-based middle ply was produced on the FEX pilot paper machine. The stock consisted of CTMP,refined hardwood and softwood pulp, and filler. FE-pulp as strength agent was compared with glue pulp, ahighly refined chemical pulp. FEX sheets and hand sheets made of pulp mixtures were evaluated. Also, thedewatering and pressing conditions on the paper machine were compared.The results confirmed the results of earlier experiments with handsheets; FE-pulp used as strength agent showedto be twice as efficient as glue pulp regarding strength properties without impairing the bulk. Further, thedewatering conditions and press dryness's on the paper machine was comparable at these additions. Thus, allthese results imply that addition of FE-pulp can replace the double amount of glue pulp as a strength agent.

Place, publisher, year, edition, pages
TAPPI, 2018
Keywords
fines-enriched pulp, strength agent, CTMP, chemithermomechanical pulp, paperboard, glue pulp, refining
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-35391 (URN)2-s2.0-85060390664 (Scopus ID)978-1-59510-268-3 (ISBN)
Conference
TAPPI Paper Conference and Trade Show, PaperCon 2018; Charlotte; United States; 15 April 2018 through 18 April 2018
Available from: 2018-10-16 Created: 2018-10-16 Last updated: 2019-03-19Bibliographically approved
Björk, E., Bouveng, M. & Vomhoff, H. (2018). Production of pulps with an extremely high fines content for use as strength agent. In: PaperCon 2018: Shaping the future through innovation. Paper presented at PaperCon 2018, April 15-18, Charlotte, NC, USA. TAPPI, Article ID PA5.1.
Open this publication in new window or tab >>Production of pulps with an extremely high fines content for use as strength agent
2018 (English)In: PaperCon 2018: Shaping the future through innovation, TAPPI , 2018, article id PA5.1Conference paper, Published paper (Refereed)
Abstract [en]

The objective was to optimize the production of fines-enriched pulp (FE-pulp) from chemical pulp.The first trial was a continuous production of FE-pulp with unbleached and bleached never-dried softwood. Thepulp was refined using a JC00 equipped with SF filling, and screened with a micro-perforated screen basket with250 μm diameter holes, but the produced FE-pulp got low concentration, below 3 g/l.The second trial aimed at optimised conditions, using dried bleached softwood. Three fillings, microbar, AA andFF were evaluated in a JC01 refiner, where microbar was most energy efficient. Microbar and AA reachedtargeted FE-pulp concentration, 10 g/l. The refined pulps were screened with different hole diameters, where, asexpected, larger hole diameters resulted in higher concentration but also lower fines content in the FE-pulps.The last trial, the microbar filling was evaluated for never-dried softwood pulp, unbleached and bleached. Now,the refining of unbleached softwood gave 3 times more fines per kWh/ton compared with first trial.These trials demonstrated the importance of the right refining conditions regarding effect of refiner and type offilling to achieve glue-pulp with high enough fines content. With the right conditions, it was possible to produceFE-pulp with high concentration at moderate energy consumption.

Place, publisher, year, edition, pages
TAPPI, 2018
Keywords
pulping, pulp, fines, strength agent, fines-enriched pulp, softwood, screening, refining, energy consumption
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-35390 (URN)2-s2.0-85060390536 (Scopus ID)978-1-59510-268-3 (ISBN)
Conference
PaperCon 2018, April 15-18, Charlotte, NC, USA
Available from: 2018-10-16 Created: 2018-10-16 Last updated: 2019-03-19Bibliographically approved
Björk, E., Vomhoff, H. & Lindgren, M. (2017). Single-stage hydrocyclone fractionation of refined bleached softwood pulp. In: PaperCon 2017: . Paper presented at PaperCon 2017, 23-26 April, 2017, Minneapolis.
Open this publication in new window or tab >>Single-stage hydrocyclone fractionation of refined bleached softwood pulp
2017 (English)In: PaperCon 2017, 2017Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

Refined bleached chemical softwood was fractionated using a hydrocyclone in a fine and a coarse fraction. The trials were done at three inject concentrations, three coarse fraction volume ratios, and with pulps refined with two refining levels.

A large difference in sheet properties between fine and coarse fraction was observed. Compared with the feed pulp, the relative change in the sheet properties increased more in the fine fractions than it decreased in the coarse fractions. Increased fines proportion had a positive effect on all properties up to a certain level when a further improvement could not be observed. Interestingly, the fine fractions of both refining levels reached the same absolute strength level, both for the tensile properties and z-strength. The fine fractions at the highest coarse fraction mass ratios contained more fines, and the mean fibre was shorter and narrower. This led to higher density but also a decrease of the stretch-at-break and z-strength values.

When comparing these results with previous fractionation results for unrefined pulp, it was found that inject concentration did not have a large effect on thickening in the present study. As for the refined pulp, the tensile index increased with fines proportion for the unrefined pulp, however, only up to a certain fines proportion where a maximum values was reached. The increase was larger for the refined pulps which had higher fines proportion.

Keywords
hydrocyclone, fractionation, refining, bleached pulp, softwood pulp
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-32949 (URN)
Conference
PaperCon 2017, 23-26 April, 2017, Minneapolis
Available from: 2018-01-02 Created: 2018-01-02 Last updated: 2018-07-19Bibliographically approved
Björk, E., Vomhoff, H. & Lindgren, M. (2017). Single-stage hydrocyclone fractionation of refined bleached softwood pulp. In: Paper Conference and Trade Show: Renew, Rethink, Redefine the Future, PaperCon 2017. Paper presented at Paper Conference and Trade Show: Renew, Rethink, Redefine the Future, PaperCon 2017; Minneapolis; United States; 23 April 2017 through 26 April 2017 (pp. 878-905). TAPPI Press, 2
Open this publication in new window or tab >>Single-stage hydrocyclone fractionation of refined bleached softwood pulp
2017 (English)In: Paper Conference and Trade Show: Renew, Rethink, Redefine the Future, PaperCon 2017, TAPPI Press, 2017, Vol. 2, p. 878-905Conference paper, Published paper (Other academic)
Abstract [en]

Refined bleached chemical softwood was fractionated using a hydrocyclone in a fine and a coarse fraction. The trials were done at three inject concentrations, three coarse fraction volume ratios, and with pulps refined with two refining levels. A large difference in sheet properties between fine and coarse fraction was observed. Compared with the feed pulp, the relative change in the sheet properties increased more in the fine fractions than it decreased in the coarse fractions. Increased fines proportion had a positive effect on all properties up to a certain level when a further improvement could not be observed. Interestingly, the fine fractions of both refining levels reached the same absolute strength level, both for the tensile properties and z-strength. The fine fractions at the highest coarse fraction mass ratios contained more fines, and the mean fibre was shorter and narrower. This led to higher density but also a decrease of the stretch-at-break and z-strength values. When comparing these results with previous fractionation results for unrefined pulp, it was found that inject concentration did not have a large effect on thickening in the present study. As for the refined pulp, the tensile index increased with fines proportion for the unrefined pulp, however, only up to a certain fines proportion where a maximum values was reached. The increase was larger for the refined pulps which had higher fines proportion.

Place, publisher, year, edition, pages
TAPPI Press, 2017
Keywords
hydrocyclone, refining, softwood, fractionation, pulp
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-33332 (URN)2-s2.0-85041498798 (Scopus ID)
Conference
Paper Conference and Trade Show: Renew, Rethink, Redefine the Future, PaperCon 2017; Minneapolis; United States; 23 April 2017 through 26 April 2017
Note

cited By 0

Available from: 2018-02-28 Created: 2018-02-28 Last updated: 2018-07-19Bibliographically approved
Björk, E., Vomhoff, H. & Bouveng, M. (2017). Usage of Fines-enriched pulp to increase strength in CTMP. In: Paper Conference and Trade Show, PaperCon 2017: Renew, Rethink, Redefine the Future. Paper presented at Paper Conference and Trade Show: Renew, Rethink, Redefine the Future, PaperCon 2017; Minneapolis; United States; 23 April 2017 through 26 April 2017 (pp. 1607-1631). TAPPI Press, 3
Open this publication in new window or tab >>Usage of Fines-enriched pulp to increase strength in CTMP
2017 (English)In: Paper Conference and Trade Show, PaperCon 2017: Renew, Rethink, Redefine the Future, TAPPI Press, 2017, Vol. 3, p. 1607-1631Conference paper, Published paper (Other academic)
Abstract [en]

Fines-enriched pulp (FE-pulp) was benchmarked against glue pulp as strength agent in eucalypt CTMP. FE-pulp was produced by combining high intensity multiple-pass refining with a fractionation in a microperforated screen basket. The fraction passing through the holes of the screen is the FE-pulp. The FE-pulp comprises of secondary fines, created in the refiner, and flexible, fibrillated highly-refined fibres or fibre fragments. Glue pulp is highly refined kraft pulp, commonly added as a strength agent in middle plies of board products, or between plies to increase the plybond. Equal amounts of FE-pulp and glue pulp were added to the original CTMP as well as to washed CTMP, where most of the CTMP-fines had been removed. The effects of the strength agents were evaluated using laboratory sheets. Both glue pulp and FE-pulp increased the strength of the CTMP sheets. The bulk of the sheets decreased however. When 5 % FE-pulp was added, the tensile index increased by more than 50 %, and the tensile energy absorption and z-strength increased by more than 100 %. FE-pulp proved to be twice as effective as glue pulp. The addition of 5 % FE-pulp resulted in the same relative strength increase as an addition of 10 % glue pulp. The washed CTMP lost all strength when the CTMP-fines content was reduced from 17 % to 3% through washing. The addition of 5 % FE-pulp restored the strength values, and at a higher bulk. The drainability in terms of CSF of that stock was much higher when compared to the original pulp.

Place, publisher, year, edition, pages
TAPPI Press, 2017
Keywords
fines, pulp, refining, CTMP, chemithermomechanical pulp, strength
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-33331 (URN)2-s2.0-85041539440 (Scopus ID)
Conference
Paper Conference and Trade Show: Renew, Rethink, Redefine the Future, PaperCon 2017; Minneapolis; United States; 23 April 2017 through 26 April 2017
Available from: 2018-02-28 Created: 2018-02-28 Last updated: 2018-07-19Bibliographically approved
Hyll, K., Björk, E. & Vomhoff, H. (2016). Flow imaging characterisation of morphological changes of chemical pulp due to refining. Nordic Pulp & Paper Research Journal, 31(3), 411-421
Open this publication in new window or tab >>Flow imaging characterisation of morphological changes of chemical pulp due to refining
2016 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 31, no 3, p. 411-421Article in journal (Refereed) Published
Abstract [en]

The influence of the refining process on the morphological changes of a chemical softwood pulp was investigated. The Voith LR40 industrial-like laboratory low consistency refiner was used, where the pulp was refined with five refining segments with differences in bar widths, groove widths, and cutting angles. The refined pulp was characterized with a fibre analyser with a spatial resolution of approximately 4 μm/pixel and a wide size range. The fines fraction of the refined pulp was also characterized with an imaging flow cytometer with a spatial resolution of 0.33 μm/pixel and a narrower size range. The fibre analyser measurements showed that the mean length, width, and aspect ratio of the fines decreased monotonically with accumulated refining energy. The imaging flow cytometer with its higher spatial resolution showed little change in fines morphology with accumulated refining energy. The morphology of the fines was more dependent on the applied specific refining energy than the design of the refining segment. However, a segment with much finer grooves and bars, initially designed for hardwood, gave significantly less fibre shortening, fines generation, external fibrillation, kink, and fines that were more fibrillar, compared to the other segments.Grant: The authors of this work would like to thank Prof. Lars Mattsson, Thomas Grahn, and Eva Ålander for fruitful discussions. The discussions with Lorentzen & Wettre were of great assistance. The financial support of the Swedish Energy Agency and the Önnesjöstiftelsen to the PhD project, and of the Fibre and Stock Design research programme to this evaluation study is gratefully acknowledged.

Keywords
Chemical pulp, Morphology, Stock characterization, Refining, Fines, Fibrillation
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-12618 (URN)10.3183/npprj-2016-31-03-p411-421 (DOI)2-s2.0-84982189716 (Scopus ID)
Available from: 2016-09-15 Created: 2016-09-15 Last updated: 2019-06-14Bibliographically approved
Björk, E., Vomhoff, H. & Bouveng, M. (2015). Production of a fine fraction using micro-perforated screens. In: Paper Conference and Trade Show (PaperCon 2015): . Paper presented at Paper Conference and Trade Show (PaperCon 2015), April 19-22, 2015, Atlanta, US (pp. 543-560). TAPPI Press, 1
Open this publication in new window or tab >>Production of a fine fraction using micro-perforated screens
2015 (English)In: Paper Conference and Trade Show (PaperCon 2015), TAPPI Press, 2015, Vol. 1, p. 543-560Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
TAPPI Press, 2015
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-33028 (URN)2-s2.0-84969543410 (Scopus ID)9781510818873 (ISBN)
Conference
Paper Conference and Trade Show (PaperCon 2015), April 19-22, 2015, Atlanta, US
Available from: 2018-01-11 Created: 2018-01-11 Last updated: 2019-08-09Bibliographically approved
Lucisano, M., Söderberg, D., Vomhoff, H., Hermansson, L., Rosén, F., Östlund, I., . . . Norman, B. (2015). Stratified forming as a tool for resource efficient papermaking. In: Paper Conference and Trade Show (PaperCon 2015): . Paper presented at Paper Conference and Trade Show (PaperCon 2015), April 19-22, 2015, Atlanta, US (pp. 767-785). TAPPI Press, 1
Open this publication in new window or tab >>Stratified forming as a tool for resource efficient papermaking
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2015 (English)In: Paper Conference and Trade Show (PaperCon 2015), TAPPI Press, 2015, Vol. 1, p. 767-785Conference paper, Published paper (Refereed)
Abstract [en]

Pilot-scale demonstration of stratified forming with innovative design of vane technology. Stratified dosage of fillers tested for: •SC-paper •Fine paper Dosage of filler and retention aid through the liquid layers gives a wider window of operation (retention-formation). Filler content can be increased with no adverse effects on strength and structure.

Place, publisher, year, edition, pages
TAPPI Press, 2015
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-771 (URN)2-s2.0-84969577607 (Scopus ID)9781510818873 (ISBN)
Conference
Paper Conference and Trade Show (PaperCon 2015), April 19-22, 2015, Atlanta, US
Available from: 2016-09-14 Created: 2016-08-03 Last updated: 2019-07-11Bibliographically approved
Krochak, P., Athley, K., Björk, E. & Norman, B. (2013). Achieving maximum filler retention by improving mechanical and chemical retention (ed.). In: : . Paper presented at 15th Fundamental reserach symposium, Cambridge, September 2013.
Open this publication in new window or tab >>Achieving maximum filler retention by improving mechanical and chemical retention
2013 (English)Conference paper, Published paper (Refereed)
Publisher
p. 33
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-9505 (URN)
Conference
15th Fundamental reserach symposium, Cambridge, September 2013
Available from: 2016-09-12 Created: 2016-09-12 Last updated: 2018-07-19Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-0385-6202

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