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Ferritsius, Olof
Publications (10 of 19) Show all publications
Ferritsius, O., Ferritsius, R., Hill, J., Karlström, A., Ferritsius, J. & Eriksson, K. (2017). Process considerations and its demands on TMP property measurements - A study on tensile index. Nordic Pulp & Paper Research Journal, 32(1), 45-53
Open this publication in new window or tab >>Process considerations and its demands on TMP property measurements - A study on tensile index
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2017 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 32, no 1, p. 45-53Article in journal (Refereed) Published
Abstract [en]

As a vital component in the strive towards improved energy efficiency in the operation of TMP refining processes, this work highlights the importance of well- designed procedures when collecting and analysing pulp properties with respect to process conditions. Process data and pulp from a CD82 chip refiner have been used to show that tensile index has strong covariance with fibre residence time calculated by the extended entropy model. A combination of theoretical and practical analysis methods has shown that, in order to assure representative, reliable results, pulp sampling procedures should comprise composite pulp samples collected during a sampling period of about three minutes. In addition, at least four subsequently collected composite pulp samples should be included in the analysis to effectively dampen effects from fast process variations as well as from slow process drift. An in-depth study on tensile index measurements clarifies that 40-60 strips should be used in the case we studied regardless if machine made paper or handsheets are considered.

Keywords
Accuracy, Composite pulp samples, Pulp sampling procedure, Residence time, Tensile index, TMP
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-30666 (URN)10.3183/NPPRJ-2017-32-01-p045-053 (DOI)000398384400006 ()2-s2.0-85016389492 (Scopus ID)
Available from: 2017-04-26 Created: 2017-04-26 Last updated: 2017-06-09Bibliographically approved
Johansson, O., Fernando, D., Fenitsius, R., Daniel, G. & Ferritsius, O. (2016). Advancements in optical analysis yields new insight to mechanical pulping processes in an efficient and inexpensive way. 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. 267-276). TAPPI Press
Open this publication in new window or tab >>Advancements in optical analysis yields new insight to mechanical pulping processes in an efficient and inexpensive way
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2016 (English)In: International Mechanical Pulping Conference 2016, IMPC 2016, TAPPI Press, 2016, p. 267-276Conference paper, Published paper (Refereed)
Abstract [en]

Operating costs, pulp quality, and loss of markets continue to dominate the concern of mechanical pulp producers. The search for process improvements, new products, and cost reductions requires significant amount of pulp testing to find out how improvements or new products can be achieved. Unfortunately, the required testing comes at a significant cost due to the time consuming and labor intensive preparation of each sample. For example, a detailed analysis which requires fractionation, hot disintegration, hand sheets, etc. may cost in excess of a thousand dollars. Thus, for an in-depth study where one compares different processes or operating conditions, the cost is significant. At the IMPC conference in Helsinki 2010, 2014 Fernando & Daniel showed how a modern variation of Simon staining can be used to gain information about the fiber wall conditions. This idea has now been expanded further by combining traditional fiber morphology measurements with the information gained from the measurement of color and intensities. In this paper, we will demonstrate a new approach to evaluate mechanical pulps using a special optical analyzer with the ability to process images in color or image intensities. The additional information gained from the color of the images is discussed. For the study, we have been comparing results from three modem commercial installations. The results from these trials are discussed using traditional testing methods in an earlier paper by Ferritsius et al., (2016). We will continue the discussion and show how these pulp samples were analyzed with a new optical device involving minimal sample preparations.

Place, publisher, year, edition, pages
TAPPI Press, 2016
Keywords
Automatic pulp tesfing, New approach to evaluating pulp quality, Process improvements
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-29833 (URN)2-s2.0-85006513310 (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: 2017-07-04Bibliographically approved
Eriksson, K., Ferritsius, R., Ferritsius, O. & Hill, J. (2016). Benefits from improved stability in process conditions and pulp properties-a double disc refiner case study. 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. 317-327). TAPPI Press
Open this publication in new window or tab >>Benefits from improved stability in process conditions and pulp properties-a double disc refiner case study
2016 (English)In: International Mechanical Pulping Conference 2016, IMPC 2016, TAPPI Press, 2016, p. 317-327Conference paper, Published paper (Refereed)
Abstract [en]

The purpose of this case study was to explore the potential for reduced energy consumption by improved process control. The application was HC post-refining of TMP in double-disc refiners. Based on data from both continuous production and from step-response tests, a thorough analysis of process performance was conducted. It was found that a significant proportion of the process disturbances, as reflected in the refiner motor load, could be successfully dampened through stabilizing measures on the basic control level. The remaining disturbances was found to be generated inside the refiner itself. In order for these disturbances to be dampened, measurements that can characterize the conditions inside the refining zone are necessary. Given the present design and instrumentation of the process, dynamic modelling of refiner motor load was performed and for fiber properties, muhivariate modeling methods were used to derive expressions for the independent variables Fl and F2. Taken together, evaluation of the models gave directions on how to further improve the process stability and indicated a potential for reduced energy consumption.

Place, publisher, year, edition, pages
TAPPI Press, 2016
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-29832 (URN)2-s2.0-85006380402 (Scopus ID)9781510830738 (ISBN)
Conference
International Mechanical Pulping Conference 2016, IMPC 2016; Jacksonville; United States; 26 September 2016 through 28 September 2016
Note

Funding details: Swedish Research and Development program

Available from: 2017-01-09 Created: 2017-01-09 Last updated: 2017-01-09Bibliographically approved
Eriksson, K., Ferritsius, J., Ferritsius, O., Ferritsius, R., Hill, J., Karlstrorrp, A. & Merseburg, K. (2016). Proper pulp sampling pre-requisite to any pulp property assessment. 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. 1-11). TAPPI Press
Open this publication in new window or tab >>Proper pulp sampling pre-requisite to any pulp property assessment
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2016 (English)In: International Mechanical Pulping Conference 2016, IMPC 2016, TAPPI Press, 2016, p. 1-11Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
TAPPI Press, 2016
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-29837 (URN)2-s2.0-85006434746 (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: 2017-01-09Bibliographically approved
Karlström, A., Hill, J., Ferritsius, R. & Ferritsius, O. (2016). Pulp property development Part II: Process non-linearities and their influence on pulp property development. Nordic Pulp & Paper Research Journal, 31(2), 287-299
Open this publication in new window or tab >>Pulp property development Part II: Process non-linearities and their influence on pulp property development
2016 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 31, no 2, p. 287-299Article in journal (Refereed) Published
Abstract [en]

It is shown in this paper that knowledge of the spatially measured temperatures inside the refining zone in TMP refiners is essential in describing non-linear dynamics of high consistency refining. By expanding the pulp and handsheet properties using piece-wise linear functions into the time domain, an auto-regressive model can be applied to verify that the tempera-ture and the consistency profiles, in combination with the motor load and production rate, are key input candidates when modeling changes in different pulp properties. The model accuracy is analyzed using process information captured at different time and operating conditions. It is also shown that it is more complex to estimate and validate the tensile index than the mean fiber length and Somerville shives content, especially close to refiner operating limits where a shift in the process gain may occur. This type of switched dynamics in tensile index estimation at a specific consistency is related to non-linear behaviors where the fiber pad distribution most likely undergoes a local collapse.

Keywords
Fiber distribution, Fiber network, Pulp quality, Refining models, System identification
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-28939 (URN)000378442300015 ()2-s2.0-84977493495 (Scopus ID)
Note

Funding Details: Norske Skog

Available from: 2016-09-27 Created: 2016-09-27 Last updated: 2017-11-21Bibliographically approved
Karlström, A., Hill, J., Ferritsius, O. & Ferritsius, R. (2016). Pulp property development Part III: Fiber residence time and consistency profile impact on specific energy and pulp properties. Nordic Pulp & Paper Research Journal, 31(2), 300-307
Open this publication in new window or tab >>Pulp property development Part III: Fiber residence time and consistency profile impact on specific energy and pulp properties
2016 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 31, no 2, p. 300-307Article in journal (Refereed) Published
Abstract [en]

This paper focuses on the pulp properties obtained from ThermoMechanical Pulp (TMP) CD refiners. Undersampled pulp variables are expanded into an oversampled set of process data, which makes it possible to analyze pulp properties in a dynamic time frame. It is shown that, in order to gain deeper insight into the defibration/fibrillation at a specific energy input, one needs to know the fiber residence time and the consistency profile. Moreover, the fiber residence time in the flat zone (FZ) and conical zone (CD) are intertwined with the consistency out from FZ and CD. Together with an external variable (production), these internal variables are essential for predicting the pulp properties. It is also shown that internal process conditions from different test series can be manipulated in the operating window using a low-frequency gain description obtained from an ARX model. The same mapping procedure can be applied to pulp and handsheet properties (in this paper represented by the tensile index), and this opens for implementation of new optimization routines to find more energy efficient operating points while maintaining prespecified pulp quality.

Keywords
Piecewise linear functions, Pulp quality models, TMP refiners
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-28946 (URN)000378442300016 ()2-s2.0-84977575108 (Scopus ID)
Note

Funding Details: Norske Skog

Available from: 2016-09-27 Created: 2016-09-27 Last updated: 2017-11-21Bibliographically approved
Ferritsius, O., Ferritsius, R., Hill, J., Eriksson, K., Mörseburg, K. & Ferritsius, J. (2016). Untaught experiences regarding common practice and standards for sampling, characterization, control, and Design of TMP and CTMP operations. 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. 12-17). TAPPI Press
Open this publication in new window or tab >>Untaught experiences regarding common practice and standards for sampling, characterization, control, and Design of TMP and CTMP operations
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2016 (English)In: International Mechanical Pulping Conference 2016, IMPC 2016, TAPPI Press, 2016, p. 12-17Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
TAPPI Press, 2016
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-29840 (URN)2-s2.0-85006372216 (Scopus ID)978-151083073-8 (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: 2017-01-09Bibliographically approved
Reyier Österling, S., Ferritsius, O., Ferritsius, R., Johansson, C.-A. & Stångmyr, J. (2016). Weighted averages and distributions of fibre characteristics of mechanical pulps – Part II: Distributions of measured and predicted fibre characteristics by using raw data from an optical fibre analyser. Appita journal, 69(1), 64-73
Open this publication in new window or tab >>Weighted averages and distributions of fibre characteristics of mechanical pulps – Part II: Distributions of measured and predicted fibre characteristics by using raw data from an optical fibre analyser
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2016 (English)In: Appita journal, ISSN 1038-6807, Vol. 69, no 1, p. 64-73Article in journal (Refereed) Published
Abstract [en]

Characterisation of fibres in mechanical pulps is important for process evaluation and control, and necessary to be able to optimise the refining process with respect to the total electric energy consumption. There are large variations of cross-sectional fibre characteristics in the wood raw material which influence the properties of the product. Despite this, it is common to evaluate the fibre characteristics as averages instead of distributions. This study shows that the raw data from a FiberLab analyser can be used to make distributions of measured and predicted fibre characteristics. The factor BIN (Bonding ability /Nfluence), which correlates to long fibre tensile index, includes both the external fibrillation and wall thickness of each fibre. Distributions of BIN, fibrillation and wall thickness which take the Characteristics of each fibre into Consideration have higher resolution than histograms. These distributions weighted by length and wall volume with maintained resolution revealed more information about the pulps than average values.

Keywords
Fibre, distribution, weighted distribution, bonding ability influence, BIN, fibre characteristic, arithmetic, wall volume, FiberLab, optical analyser, collapse resistance index
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-24177 (URN)000371190200017 ()2-s2.0-85010817787 (Scopus ID)
Available from: 2015-01-20 Created: 2015-01-20 Last updated: 2017-12-05Bibliographically approved
Engstrand, P. O., Ferritsius, O., Björkqvist, O., Johansson, L., Johansson, Ö., Daniel, G., . . . Sandberg, C. (2015). Mekmassainitiativet för energieffektivitet, e2mp-i. Sundsvall: Mittuniversitetet
Open this publication in new window or tab >>Mekmassainitiativet för energieffektivitet, e2mp-i
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2015 (Swedish)Report (Other academic)
Abstract [sv]

Projektet har drivits som ett program för finansiering av forskning som ska utveckla ochdemonstrera tekniker som reducerar elenergiförbrukningen med 50% vid tillverkning avTMP och CTMP med bibehållna slutproduktegenskaper hos tryckpapper och kartong.Programmet är en del av skogsindustrins initiativ att under en tioårsperiod tillsammansmed svenska och norska finansiärer investera minst 200 Mkr för att nå detta radikalaeffektiviseringsmål. Ett uttalat mål för industriinitiativet är också att befästaforskningsnoderna vid FSCN i Sundsvall och PFI i Trondheim.

Parallellt med Energimyndighetens finansiering, 30 Mkr, har Norges Forskningsråd satsat25 MNOK (2010‐14) i industriinitiativet, KK‐stiftelsen 36 MSEK (2011‐17) ochMittuniversitetet har finansierat12 MSEK. Industrins totala satsning kommer att överstiga100 MSEK redan vid utgången av 2017.

Resultat från benchmarkingstudien BAT2012 av industrins modernaste TMP‐ och CTMPlinjersamt från demonstrationsskaleprojekt visas i rapporten. Projekten baseras delvis pågrundläggande forskningsprojekt genomförda inom FSCN´s KK‐stiftelse‐finansieradeforskningsprofil och projektet ”Filling the Gap” 31676‐, ISSN 1650‐5387 2014:57. Resultaten visar följande reduktionsnivåer; 28% TMP för news (Braviken), 14% TMP för SC(Kvarnsveden) och 21% CTMP för kartong (Skoghall).

Utöver demoprojekten finns ytterligare tydliga potentialer beskrivna i övriga delprojekt:

Processintensifiering och processmodifiering > 15%

Processtabilitet via avancerad processanalys och reglering > 15%

Kombinera effektivaste processavsnitt från benchmarking ca 25%Detta gör det troligt att det kommer att gå att i fullskaliga demonstrationsförsök validera50% elenergireduktion inom de tre produktområdena, förutsatt att fortsattforskningsfinansiering finns tillgänglig. Tre av de idéer till avknoppningsprojekt somframkommit under projektets gång har redan erhållit beslut om finansiering frånEnergimyndigheten 2015. Ytterligare projektförslag baserade på den här redovisadeforskningen kommer att ingå i ansökningar under 2016. Utöver energireduktion i själva TMP‐ och CTMP‐processerna har forskare vid FSCN lagt forskningsgrunden för hur manska kunna tillverka mycket starka förpackningsmaterial från dessa massatyper på ettenergieffektivt sätt. Även inom detta område kommer en ansökning omuppskalningsprojekt att skickas in.

Place, publisher, year, edition, pages
Sundsvall: Mittuniversitetet, 2015. p. 164
Series
Rapportserie FSCN, ISSN 1650-5387 ; 2015:58
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-27663 (URN)978-91-88025-56-2 (ISBN)
Projects
e2mp
Funder
Swedish Energy Agency, 32326-1
Available from: 2016-05-16 Created: 2016-05-16 Last updated: 2017-02-07Bibliographically approved
Karlström, A., Hill, J., Ferritsius, R. & Ferritsius, O. (2015). Pulp property development Part I: Interlacing under-sampled pulp properties and TMP process data using piece-wise linear functions. Nordic Pulp & Paper Research Journal, 30(4), 599-608
Open this publication in new window or tab >>Pulp property development Part I: Interlacing under-sampled pulp properties and TMP process data using piece-wise linear functions
2015 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 30, no 4, p. 599-608Article in journal (Refereed) Published
Abstract [en]

Thermo-Mechanical Pulp (TMP) refiners served in this work as an example of how to combine oversampled and undersampled variables on a common timeframe for further analysis.To get more information from the refining process, temperature measurement arrays in the refining zones were studied alongside process measurements such as motor load, production rates, plate gaps, dilution waters, pulp properties and manually measured blow-line consistency.The undersampled data set consisted of 63 laboratory samples obtained at a Swedish TMP mill, which were tested for tensile index, mean fiber length and Somerville shives content. The pulp samples were obtained at five different periods during three months to cover a large dynamic operating window.The data set was expanded using a piece-wise linear approach. The measurements inside the refining zone were shown to be important variables when interlacing the undersampled pulp properties with the oversampled process data set, consisting of 350 000 samples.Use of an extended entropy model provided a palette of information about the process conditions inside the refining zone. Particularly, the residence time and the consistency in the refining zones were essential for the pulp property development, as a link between the refining segment pattern used and the current state of refiner operation.

Keywords
Pulp quality models, TMP refiners, Piece-wise linear functions
National Category
Polymer Technologies
Identifiers
urn:nbn:se:miun:diva-26502 (URN)10.3183/NPPRJ-2015-30-04-p599-608 (DOI)000366040300007 ()2-s2.0-84951790424 (Scopus ID)
Funder
Swedish Energy Agency
Available from: 2015-12-15 Created: 2015-12-15 Last updated: 2017-08-10Bibliographically approved
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