Change search
Refine search result
3456789 251 - 300 of 552
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Rows per page
  • 5
  • 10
  • 20
  • 50
  • 100
  • 250
Sort
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
  • Standard (Relevance)
  • Author A-Ö
  • Author Ö-A
  • Title A-Ö
  • Title Ö-A
  • Publication type A-Ö
  • Publication type Ö-A
  • Issued (Oldest first)
  • Issued (Newest first)
  • Created (Oldest first)
  • Created (Newest first)
  • Last updated (Oldest first)
  • Last updated (Newest first)
  • Disputation date (earliest first)
  • Disputation date (latest first)
Select
The maximal number of hits you can export is 250. When you want to export more records please use the Create feeds function.
  • 251.
    Kaldeus, Tahani
    et al.
    Wallenberg Wood Science Center, Sweden.
    Larsson, Per Tomas
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Boujemaoui, Assya
    KTH Royal institute of technology, Sweden.
    Malmström, Eva
    KTH Royal institute of technology, Sweden.
    One-pot preparation of bi-functional cellulose nanofibrils2018In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882XArticle in journal (Refereed)
    Abstract [en]

    Herein, we present a route to obtain bi-functional cellulose nanofibrils (CNF) by a one-pot approach using an already established functionalisation route, carboxymethylation, to which a subsequent functionalisation step, allylation or alkynation, has been added in the same reaction pot, eliminating the need of solvent exchange procedures. The total charge of the fibres and the total surface charge of the nanofibrils were determined by conductometric and polyelectrolyte titration, respectively. Furthermore, the allyl and alkyne functionalised cellulose were reacted with methyl 3-mercaptopropionate and azide-functionalised disperse red, respectively, to estimate the degree of functionalisation. The samples were further assessed by XPS and FT-IR. Physical characteristics were evaluated by CP/MAS 13C-NMR, XRD, AFM and DLS. This new approach of obtaining bi-functionalised CNF allows for a facile and rapid functionalisation of CNF where chemical handles can easily be attached and used for further modification of the fibrils. Graphical abstract: [Figure not available: see fulltext.

  • 252.
    Kalogiannis, Konstantinos G.
    et al.
    Center for Research and Technology Hellas, Greece.
    Stefanidis, Stylianos D.
    Center for Research and Technology Hellas, Greece; University of Western Macedonia, Greece.
    Michailof, Chrysoula M.
    Center for Research and Technology Hellas, Greece.
    Lappas, Angelos A.
    Center for Research and Technology Hellas, Greece.
    Sjöholm, Elisabeth
    RISE, Innventia.
    Pyrolysis of lignin with 2DGC quantification of lignin oil: Effect of lignin type, process temperature and ZSM-5 in situ upgrading2015In: Journal of Analytical and Applied Pyrolysis, ISSN 0165-2370, E-ISSN 1873-250X, Vol. 115, p. 410-418Article in journal (Refereed)
    Abstract [en]

    Thermal and catalytic pyrolysis of various types of lignin and their influence on the yield and the quality of the produced lignin oil were studied. Lignins originated from a mixture of pine and spruce wood (softwood), a mixture of birch and aspen wood (hardwood) and Eucalyptus Urograndis. High degree of deoxygenation of the bio-oil and maximum yield of value-added chemicals were the main targets of this work. 2DGC-ToFMS analysis was used for the qualitative and quantitative characterization of the lignin oils. Softwood lignin was found to be the most attractive feedstock and high yields of a mixture of phenolic compounds were detected in all cases. High char production was also evident for all types of lignins accounting for almost 50% of the original feedstock. The use of a commercial ZSM-5 catalyst was extremely beneficial for the process, enhancing deoxygenation at higher oil yields compared to thermal pyrolysis. Depending on the nature of the lignin, guaiacyl or syringyl groups were dominant in the oils and it was found that process optimization, involving lignin, catalyst selection and temperature could significantly improve the process efficiency.

  • 253.
    Kamal Alm, Hajer
    et al.
    RISE, Innventia.
    Ström, Göran
    RISE, Innventia.
    Schoelkopf, Joachim
    OMYA Deveopment AG, Switzerland.
    Ridgway, Cathy
    OMYA Deveopment AG, Switzerland.
    Gane, Patrick A. C.
    OMYA Deveopment AG, Switzerland; Aalto University, Finland.
    Ink adhesion failure during full scale offset printing: causes and impact on print mottle2015In: Journal of Print and Media Technology Research, ISSN 2223-8905, Vol. 4, no 4, p. 257-284Article in journal (Refereed)
    Abstract [en]

    The printing plate used in offset lithography is designed to accept ink on image areas and reject ink on non-image areas. In order to reject ink in conventional offset, fountain solution is needed to form a weak boundary layer between the plate and the ink. Paper and coated paper in particular are designed to accept ink and absorb ink oil and fountain solution. The latter is often transferred to the paper surface through the rubber blanket and its absorption or subsequent displacement is essential for final ink transfer to the surface. There are strong demands on the uniformity of the paper surface, including in respect to absorptivity, both in structure and chemistry, in order to gain a print of high quality. If this is not the case, the ink film thickness may be non-uniform; subsequently, ink adhesion may even fail completely, leaving white spots on the paper surface in the print. This gives rise to print mottle, a severe print quality defect. The aim of this paper was to study the quality of prints from a full scale offset printing trial made on pilot coated paper, with attention given to ink-surface adhesion. Seven calcium carbonate pigment based coatings with different contents of pigment  dispersing agent were included in this study. The work showed that a moderate over-dosage of dispersant significantly increased the ink adhesion failure and print mottle, mainly on prints from the later print units and especially at high fountain feed levels. These findings demonstrate the fundamental impact of fount level, surface chemistry and coating  formulation on ink adhesion and thus also print mottle.

  • 254.
    Kamel, H.
    et al.
    RISE, STFI-Packforsk.
    Ström, Göran
    RISE, STFI-Packforsk.
    Schoelkopf, J.
    Gane, P. A. C.
    Characterization of ink adhesion failure; effect of pre-dampening of carbonate containing coatings2008In: TAPPI Advanced Coating Fundamentals Symposium Proceedings, TAPPI Press, 2008, p. 228-241Conference paper (Refereed)
    Abstract [en]

    To attain an improved knowledge about ink adhesion during offset printing we have developed a laboratory procedure to measure adhesion failure between ink and coated paper during ink setting. This paper describes the technique and a special case, where a normal coating and a coating with excess dispersing agent, in the form of sodium polyacrylate, have been printed. Characterization of the areas where the adhesion had failed at the pull-off points after tack testing was done by determining "white" spots in the retained print using image analysis. The "white" spots represent areas where ink has detached from the coating after contact with a rubber coated cylinder. This area is referred to as adhesion failure area (AFA). A minimum in AFA at the point of maximum in tack force was found for both coatings where the print was applied onto dried coating. When the coatings, however, were pre-damped, AFA increased on the normal coating over a short time period, independent of the dampening level. For the coating with excess dispersant, on the other hand, the higher dampening level strongly increased the AFA. The strong impact of excess dispersing agent in this work may be explained by a number of related effects, including increased polarity of the coating surface, and an associated moisture layer, and an effective reduction of fine pores due to water-swelling polyacrylate that blocks these pores.

  • 255.
    Karlholm, Ingeli
    et al.
    RISE, STFI-Packforsk.
    Lindgren, Karin
    RISE, STFI-Packforsk.
    Water-soluble kraft lignin products through sulphomethylation2008In: 2008 Nordic Wood Biorefinery Conference - Proceedings: NWBC 2008, 2008, p. 207-208Conference paper (Refereed)
  • 256.
    Karlsson, Pernilla
    et al.
    KTH Royal Institute of Technology, Sweden.
    Pendergraph, Samuel
    KTH Royal Institute of Technology, Sweden.
    Larsson, Per Tomas
    RISE, Innventia.
    Wågberg, Lars
    KTH Royal Institute of Technology, Sweden.
    Cellulose model probes for unraveling the swelling behavior of wood fibres2016In: The 7th Workshop on cellulose, regenerated cellulose and cellulose derivatives, 2016, p. 33-34, article id 8Conference paper (Other academic)
  • 257.
    Karlsson, Rose-Marie Pernilla
    et al.
    KTH Royal Institute of Technology, Sweden.
    Larsson, Per Tomas
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy. KTH Royal Institute of Technology, Sweden.
    Hansson, Per
    Uppsala University, Sweden.
    Wågberg, Lars
    KTH Royal Institute of Technology, Sweden.
    Thermodynamics of the Water-Retaining Properties of Cellulose-Based Networks2019In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 20, no 4, p. 1603-1612Article in journal (Refereed)
    Abstract [en]

    Noncrystalline cellulose-based gel beads were used as a model material to investigate the effect of osmotic stress on a cellulosic network. The gel beads were exposed to osmotic stress by immersion in solutions with different concentrations of high molecular mass dextran and the equilibrium dimensional change of the gel beads was studied using optical microscopy. The volume fraction of cellulose was calculated from the volume of the gel beads in dextran solutions and their dry content and the relation between the cellulose volume fraction and the total osmotic pressure was thus obtained. The results show that the contribution to the osmotic pressure from counterions increases the water-retaining capacity of the beads at high osmotic pressures but also that the main factor controlling the gel bead collapse at high osmotic strains is the resistance to the deformation of the polymer chain network within the beads. Furthermore, the osmotic pressure associated with the deformation of the polymer network, which counteracts the deswelling of the beads, could be fitted to the Wall model indicating that the response of the cellulose polymer networks was independent of the charge of the cellulose. The best fit to the Wall model was obtained when the Flory-Huggins interaction parameter (χ) of the cellulose-water system was set to 0.55-0.60, in agreement with the well-established insolubility of high molecular mass β-(1,4)-d-glucan polymers in water.

  • 258.
    Karlström, K.
    et al.
    RISE, Innventia.
    Sjögren, B.
    RISE, Innventia.
    Vorwerg, W.
    Volkert, B.
    Sulphur-free cooking for value added cellulose2014In: Cellulose Chemistry and Technology, ISSN 0576-9787, Vol. 48, no 9-10, p. 781-786Article in journal (Refereed)
  • 259.
    Karlström, Katarina
    et al.
    RISE, Innventia.
    Sjögren, Birger
    RISE, Innventia.
    Kulander, Ida
    RISE, Innventia.
    Sulphur-free process for dissolving pulp2014Conference paper (Refereed)
  • 260. Kihlman, M.
    et al.
    Aldaeus, F.
    RISE, Innventia.
    Chedid, F.
    RISE, Innventia.
    Germgård, U.
    Effect of various pulp properties on the solubility of cellulose in sodium hydroxide solutions2012In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, no 5, p. 601-606Article in journal (Refereed)
  • 261.
    Kihlstedt, Annika
    et al.
    RISE, Innventia.
    Lindberg, Siv M
    RISE, Innventia.
    Lindström, Annika
    RISE, Innventia.
    Pousette, Sandra
    RISE, Innventia.
    Material identity in a packaging context2014Conference paper (Refereed)
    Abstract [en]

    Package design includes a number of considerations ranging from protecting the content to conveying the brand image. The aim of this study was to gain a deeper understanding on how Swedish consumes perceive product packaging attributes, with a special emphasis on in which way packaging material (carton, paper plastic), and structural design (folding carton, paper bag, standing pouch and plastic bag), have an emotional impact on consumers' evaluation of the product and packaging. Assessing the appearance and effectiveness of a packaging system is often confounded by branding, why it is important to separate the brand influence from the attributes of the packaging system. Thus, in the experimental part, packaging prototypes of different structural design and materials were manufactured in order to present commercial cereal brands in different types of packaging. The research involved a combination of qualitative and quantitative methods, comprising (i) focus groups on cereal (muesli) packaging; (ii) a mock-up study of four muesli packaging types: transparent plastic bag, carton box, paper bag, and a resalable stand-up plastic pouch; and (iii) a questionnaire on environmental attitudes to packaging materials. Fourteen respondents participated in the focus groups and 20 in the mock-up study. Result show that the paper bag and the carton box were perceived to be the most environmentally friendly packaging material. Heavy ink usage on paper bags and carton boxes can however raise concern regarding the environmental impact. Introducing functionality and good print quality can cause preferences to divert to an alternative packaging material. In the mock-up study the standing pouch was the most liked package type regardless of brands. Functional reasons (protect, re-closable etc.) and appearance reasons (nice print, nice colours) was claimed for giving this package high ratings.

  • 262. Kirabira, J. B.
    et al.
    Jonsson, S.
    Drotz, Mattias
    RISE, STFI-Packforsk.
    Karathanasis, Michael
    RISE, STFI-Packforsk.
    Norman, Bo
    RISE, STFI-Packforsk.
    Properties of super-calendered (SC) paper filled with Mutaka kaolin, Uganda2009In: Paper Technology, ISSN 0306252X, Vol. 50, no 1, p. 11-16Article in journal (Refereed)
    Abstract [en]

    The experts from Makerere University (Mak) and the Royal Institute of Technology (KTH) evaluated three mineral deposits for the production of fireclay refractories in Uganda and found that the Mutaka kaolin deposit in Uganda is of extraordinary quality. Ten tons of raw kaolin was mined at the Mutaka deposit and shipped in a container to STFI-Packforsk, Sweden. The kaolin was first dry sieved in a shaker to remove sand, mica and large particles. The sieved material was mixed with fresh water to a dry content of 15% and hydrocycloned to separate and remove coarse particles. The paper machine trials were carried out at STFI-Packforsk on the EuroFEX paper machine. The results indicate that the potential of exploiting the Mutaka kaolin deposit for paper filling is high. Paper filled with Mutaka clay resulted in a slightly lower opacity, however, with an optimized particles size distribution, this could be improved.

  • 263.
    Krochak, Paul
    et al.
    RISE, Innventia.
    Athley, Karin
    RISE, Innventia.
    Björk, Elisabeth
    RISE, Innventia.
    Norman, Bo
    RISE, Innventia.
    Achieving maximum filler retention by improving mechanical and chemical retention2013Conference paper (Refereed)
  • 264.
    Krochak, Paul
    et al.
    RISE, Innventia.
    Fasci, G.C.
    Norman, Bo
    RISE, Innventia.
    Wittberg, L.P.
    Bridging chemical dosage, mixing quality and variability in paper sheets2013Conference paper (Refereed)
  • 265.
    Krochak, Paul
    et al.
    RISE, Innventia.
    Fasci, Giuseppe Carmini
    KTH Royal Institute of Technology, Sweden.
    Norman, Bo
    RISE, Innventia.
    Prahl Wittberg, Lisa
    KTH Royal Institute of Technology, Sweden.
    Bridging chemical dosage, mixing quality, and variability in paper sheets2015In: TAPPI Journal, ISSN 0734-1415, Vol. 14, no 5, p. 311-320Article in journal (Refereed)
    Abstract [en]

    In the first part of this work, a series of paper production trials were performed on a forming experimental (FEX) pilot machine to investigate the distribution of additives in the final product. In these trials, a blue color was dosed into the stock before the headbox instead of a retention aid. Fine paper sheets were produced using twin-wire forming. Visual inspection of the sheets revealed surprisingly high levels of variability of the blue color. In the second part, the effect of different dosage nozzle configurations on downstream mixing quality of a single-component, polyacrylamide retention aid was studied using two-phase computational fluid dynamics. A non-Newtonian model for this phase was implemented using rheological parameters obtained through a combination of numerical and experimental analysis. Dosage was made into a turbulent pipe flow under typical industrial approach flow conditions. The effect of the number of dosage points, impingement angle, dosage location, and dosage speed on mixing uniformity was investigated qualitatively and quantitatively. Results from these studies indicate the existence of optimal dosage configurations and point toward strong coupling between chemical addition strategy, mixing quality, and chemical variability in final products. Application: Mills can gain valuable information, including dosage nozzle configuration and dosage conditions, for optimizing mixing of retention aids in the approach flow during paper production.

  • 266.
    Krochak, Paul J.
    et al.
    RISE - Research Institutes of Sweden, Bioeconomy.
    Norman, Bo
    RISE - Research Institutes of Sweden, Bioeconomy.
    Hermansson, Lennart
    RISE - Research Institutes of Sweden, Bioeconomy.
    Holmqvist, Claes
    RISE - Research Institutes of Sweden, Bioeconomy.
    Headbox induced sheet variability2017In: PaperCon 2017 / [ed] TAPPI, 2017, Vol. 2, p. 673-680Conference paper (Other academic)
  • 267.
    Krochak, Paul
    et al.
    RISE, Innventia.
    Lucisano, Marco
    RISE, Innventia.
    Trends and drivers influencing papermaking and its products towards the future2014Conference paper (Refereed)
  • 268.
    Krochak, Paul
    et al.
    RISE, Innventia.
    Lucisano, Marco F. C.
    RISE, Innventia.
    Trends and drivers influencing papermaking and its products towards the future2014Conference paper (Refereed)
    Abstract [en]

    "Papermaking towards the future" is a project investigating the current state and future of global paper manufacture. The project is a critical investigation into the most important questions for the industry today and into the future. What changes can be observed and are currently taking place? What are the challenges at present, and how will they manifest themselves going forward? In which areas is the outlook most promising for the paper industry and how are we going to get there? Through a combination of expert interviews, workshops, a Dephi survey with respondents in 21 different countries, a student survey, and months of our own research, we have identified what we believe are the most important drivers for global change and the most important growing trends in the paper and packaging industry going forward 20 years. Projecting the information collected throughout this project forward in time, we see a high likelihood that the paper and packaging industry will shift into one centred around bio-refining, where a broad range of forest based products will be produced to support a bio-based world. The future products creating the greatest return on investment will include bio-plastics, bio-chemicals, bio-energy, cellulose textiles, and paper-based packaging materials, where everything produced will be sustainably sourced and everything recycled. However, it is critical that the paper and packaging industry strategize today for this promising future of tomorrow, through investments in marketing, organization, and new product innovation. Moreover, it is important that the industry capitalize on their strong position within this potential bio-based world, by exploiting their fibre processing infrastructure, knowledge, and experience with producing sustainable and recycling products from the forest.

  • 269.
    Krochak, Paul
    et al.
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
    Norman, Bo
    RISE - Research Institutes of Sweden, Bioeconomy, Papermaking and Packaging.
    Practical Aspects of Retention Aids Addition on Web Structure Variability2018In: PaperCon 2018: Shaping the future throuch innovation, 2018, p. 6-15, article id FF3.2Conference paper (Refereed)
    Abstract [en]

    In this work, we report on a series of pilot scale production trials investigating the effect of addition location, dosage velocity ratio and dilution level of a single component retention system (CPAM) on filler retention, formation and in-plane web structure uniformity for a fine paper grade. Specifically, we considered addition levels (500 g/t and 1000 g/t), dosage velocity ratios (2 and 4.5), and pre-dilution (300x and 600x) and addition location (before and after the headbox pump). The in-plane distribution of fibre and filler material in the final product was then mapped in high resolution over 10m paper samples using moveable radiation emitters and detectors.It was shown that addition of CPAM before the headbox pump resulted in a reduction in filler retention and poor formation in the final product. The addition velocity ratio was shown to have only minor influence on retention, formation and web structure variability. However, low CPAM dilution levels resulted in a high degree of variability in the distribution of filler and fibre including streakiness. Moreover, at low dilution levels, the in-plane distribution of filler was highly correlated to that of the fibres. By optimizing the dilution level and addition location, conditions could be established to reduce CPAM addition levels without adversely affecting retention or product variability.

  • 270.
    Krochak, Paul
    et al.
    RISE, Innventia.
    Norman, Bo
    RISE, Innventia.
    Techniques for improving mixing quality2014Conference paper (Refereed)
  • 271.
    Krochak, Paul
    et al.
    RISE, Innventia.
    Norman, Bo
    RISE, Innventia.
    Hermansson, Lennart
    RISE, Innventia.
    The flocculation response of a dual component retention system subject to different mixing conditions2016In: Paper Conference and Trade Show (PaperCon 2016), 2016, Vol. 2, p. 987-994Conference paper (Other academic)
    Abstract [en]

    In this work, we study the fibre flocculation response created by a dual component retention system subject to different addition and mixing conditions. The motivation for this work is to develop new approaches to optimize the performance of retention aids systems for improving the retention-formation relationship. We do so through a combination of pilot scale production trials in combination with semi-pilot scale flow visualization using a cationic Polyacrylamide (CPAM) polymer and silica micro-particle retention system. Specifically, we investigate the effects of local turbulence levels, hydrodynamic shear applied to the polymer phase, and the time between addition of the polymer, micro-particle and to the headbox/forming section. Results from our production trials showed that optimal retention system performance can be achieved when the polymer and micro-particle components are added only a fraction of a second from each other and from the headbox in the presence of high levels of turbulence and with exposure to minimum hydrodynamic shear. Under optimal conditions, the improvements in retention realized were over 50% with simultaneous improvements in formation in excess of 30% with respect to a reference case. We then attempt to understand the mechanisms for this optimal response by simulating the same addition and mixing conditions on an experimental flow loop. The suspension flocculation dynamics are studied by visualization in a transparent pipe section. It is shown that when the polymer is exposed to high shear, the suspension does not reflocculate, even after addition of the micro-particle, which correlated with low filler retention in the production trials. When turbulence levels remained low, the suspension flocculated very quickly upon addition of the components, reaching large floc sizes in a very short amount of time. This correlated to poor formation in the production trials. When the retention system components were added immediately downstream a turbulence source but not subjected to any additional shear, the fibre floc size remained small and showed a slow tendency toward reflocculation. These conditions correlated to optimal retention and formation in the production trials.

  • 272.
    Krochak, Paul
    et al.
    RISE, Innventia.
    Schack, S.
    Fasci, G.
    New insights into retention aids dosage and mixing2012In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, no 2, p. 192-201Article in journal (Refereed)
  • 273.
    Krochak, Paul
    et al.
    RISE, Innventia.
    Schack, Susanne
    Fasci, Giuseppe
    Investigation of retention aid polymer degradation on a pilot scale flow loop2012Conference paper (Refereed)
  • 274.
    Krochak, Paul
    et al.
    RISE, Innventia.
    Söderberg, Daniel
    RISE, Innventia.
    Vomhoff, Hannes
    RISE, Innventia.
    Faia, Pedro
    University of Coimbra, Portugal.
    Monitoring tools for efficient papermaking2014Conference paper (Refereed)
    Abstract [en]

    With efficient papermaking, the objective is to produce a product that meets a sufficiently high performance standard at the lowest possible cost for production. Production costs tend to centre around the use of energy, raw fibre materials, and fresh water. Poor control of unit papermaking processes can create unwanted variability in product qualities. This forces producers to use excessive amounts of resource, including fibre raw material and energy in order to meet minimum product requirements. Control of unit processes is therefore an essential ingredient to efficient papermaking. One of the key challenges with process control is the ability to monitor accurately specific processes with a high spatial and temporal resolution in order to capture unwanted variability. New measurement methods have, within recent years, revealed surprisingly high levels of variability in many unit process, in product properties, and in the underlying structure of paper sheets. In particular, variability on the centimetre (or millisecond) scale is now understood to be significant. This work presents an overview of three novel measurement tools and their application for monitoring different stages of the paper production process. Specifically, the tools discussed here include, Electrical Impedance Tomography (EFT), STFI Online Forming Analyser (SOFA), and Infrared Thermography (IR) techniques. Potential implementations of each tool within different unit processes on a papermachine are supported by practical examples. When used together, it is shown that it could be possible to monitor the entire production line with enough accuracy for online control.

  • 275.
    Krochak, Paul
    et al.
    RISE, Innventia.
    Thomson, Lars
    RISE, Innventia.
    A new method for characterizing turbulent mixing in semi-concentrated suspensions2011Conference paper (Refereed)
  • 276.
    Krochak, Paul
    et al.
    RISE - Research Institutes of Sweden, Bioeconomy. RISE, Innventia.
    ֖stlund, Catherine
    RISE - Research Institutes of Sweden, Bioeconomy. RISE, Innventia.
    The effect of press nip geometry and web temperature on dryness, density and paper properties2017In: PaperCon 2017 / [ed] TAPPI, 2017Conference paper (Other academic)
  • 277.
    Krochak, Paul
    et al.
    RISE, Innventia.
    ֖stlund, Catherine
    RISE, Innventia.
    The effect of press nip geometry and web temperature on dryness, density and paper properties2017In: Paper Conference and Trade Show: Renew, Rethink, Redefine the Future, PaperCon 2017, TAPPI Press, 2017, Vol. 1, p. 297-300Conference paper (Refereed)
  • 278.
    Krochak, Paul
    et al.
    RISE - Research Institutes of Sweden, Bioeconomy.
    ֖stlund, Catherine
    RISE - Research Institutes of Sweden, Bioeconomy.
    The effect of press nip geometry on dryness, density and paper properties2017In: 16th Fundamental research symposium, 2017, p. 323-343Conference paper (Refereed)
  • 279.
    Krochak, Paul
    et al.
    RISE - Research Institutes of Sweden, Bioeconomy.
    ֖stlund, Ida
    RISE - Research Institutes of Sweden, Bioeconomy.
    Ankerfors, Caroline
    RISE - Research Institutes of Sweden, Bioeconomy.
    Gimåker, Magnus
    RISE - Research Institutes of Sweden, Bioeconomy.
    Waljanson, Alexander
    RISE - Research Institutes of Sweden, Bioeconomy.
    Hermansson, Lennart
    RISE - Research Institutes of Sweden, Bioeconomy.
    Possible benefits of adding retention AIDS as well as cationic starch for dry strength very close to the headbox2017In: Paper Conference and Trade Show: Renew, Rethink, Redefine the Future, PaperCon 2017, TAPPI Press, 2017, Vol. 2, p. 695-704Conference paper (Other academic)
    Abstract [en]

    Previous research made at RISE Bioeconomy (former Innventia) has shown significant improvements to both retention and formation when retention AIDS, cationic polyacrylamide (C-PAM) and microparticulate silica, were added very close to the headbox given that the mixing was adequate. The pilot trial that showed these results used a somewhat idealised system since the furnish used consisted solely of fibre, filler and retention aid. In addition to these components, it is very common to add some cationic starch to the thick stock to increase the paper strength. When cationic starch (0.5%) had been added to the thick stock there was no longer any obvious positive effect on the retention-formation relationship with the late dosage of the retention system. This spurred a further investigation and trials in which also the cationic starch was added just prior to the headbox, such that the contact times of all three components (C-PAM, microparticulate silica and cationic starch) were less than 3 seconds prior to forming. Also in these cases, the general positive effect on the formation-retention relationship was not seen, but the C-PAM dosage needed to obtain a certain retention level was much less as compared to when the normal dosage positions were used. This clearly demonstrates possibilities to drastically decrease the C-PAM consumption. Only marginal negative effect on the mechanical properties of the produced paper was seen when the starch was added just prior to the headbox as compared to in the thick stock. It is common wisdom that starch should have a long contact time to give optimal strength gain. The presented results show that this needs not to be the case, and the key is probably adequate mixing.

  • 280.
    Kronqvist, Malin
    et al.
    RISE, Innventia.
    Kulander, Ida
    RISE, Innventia.
    Promoting sustainable decisions at pulp mill biorefineries with LCA2014Conference paper (Refereed)
  • 281.
    Kumar, Vinay
    et al.
    Åbo Akademi University, Finland.
    Ottesen, Vegar
    NTNU, Norway.
    Syverud, Kristin
    RISE - Research Institutes of Sweden, Bioeconomy, PFI.
    Gregersen, Öyvind Weiby
    NTNU, Norway.
    Toivakka, Martti
    Åba Akademi University, Finland.
    Coatability of cellulose nanofibril suspensions: Role of rheology and water retention2017In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 12, no 4, p. 7656-7679Article in journal (Refereed)
    Abstract [en]

    Cellulose nanofibril (CNF) suspensions are not easily coatable because of their excessively high viscosity and yield stress, even at low solids concentrations. In addition, CNF suspensions vary widely in their properties depending on the production process used, which can affect their processability. This work reports roll-to-roll coating of three different types of CNF suspensions with a slot-die, and the influence of rheology and water retention on coatability is addressed. The impact of CMC addition on the high and low shear rate rheology, water retention, coatability, and final coating quality of these suspensions is reported. All three CNF suspensions were coated successfully using the slot-die coating process. CMC addition further improved the coatability by positively influencing both the low and high shear rate viscosity and water retention of the CNF suspensions. All CNF coatings significantly improved the air, heptane vapor, grease and oil barrier, while reducing the water vapor transmission rate to some extent.

  • 282.
    Köhnke, Tobias
    et al.
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Theliander, Hans
    Chalmers University of Technology, Sweden.
    Hedlund, Artur
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Coagulation and structure formation of cellulose from EmimAc- DMSO solutions2015Conference paper (Other academic)
  • 283. Köhnke, Tobias
    et al.
    Theliander, Hans
    Chalmers University of Technology, Sweden.
    Hedlund, Artur
    RISE - Research Institutes of Sweden, Materials and Production, IVF.
    Investigations into the coagulation of cellulose from EmimAc: DMSO solutions in common protic solvents2015Conference paper (Other academic)
  • 284. Laaksometsä, C.
    et al.
    Axelsson, E.
    Berntsson, T.
    Lundström, Anders
    RISE, STFI-Packforsk.
    Energy savings combined with lignin extraction for production increase: Case study at a eucalyptus mill in Portugal2009In: Clean Technologies and Environmental Policy, ISSN 1618-954X, E-ISSN 1618-9558, Vol. 11, no 1, p. 77-82Article in journal (Refereed)
    Abstract [en]

    In previous research by the authors, energy savings combined with lignin extraction as a means to debottleneck the recovery boiler were evaluated on a model mill. The study showed that this concept was a profitable alternative to recovery boiler upgrade. In the present paper the concept was taken one step further, and the potential for energy savings and possibilities for lignin extraction were evaluated at a real mill: a market pulp mill in Portugal. The energy-saving methods proved to be applicable also to the real mill and the steam-saving potential was 4.2 GJ/ADt or 33%. Lignin extraction trials with bench scale equipment showed that lignin extraction was fully viable at the studied mill. A full-scale lignin separation plant according to the LignoBoost concept, combined with energy savings, was simulated in a computer environment and compared to installation of a new recovery boiler. A new recovery boiler had an investment cost four times higher than the LignoBoost concept combined with energy savings, but the electricity production would be higher. The profitability for a production increase of 16% was calculated for both cases. Steam savings combined with LignoBoost were found to have better profitability unless the electricity price is very high. © 2008 Springer-Verlag.

  • 285.
    Larsson, Mårten
    et al.
    KTH Royal Institute of Technology, Sweden.
    Jansson, Mikael
    RISE, Innventia.
    Grönkvist, Stefan
    KTH Royal Institute of Technology, Sweden.
    Alvfors, Per
    KTH Royal Institute of Technology, Sweden.
    Techno-economic assessment of anaerobic digestion in a typical Kraft pulp mill to produce biomethane for the road transport sector2015In: Journal of Cleaner Production, ISSN 0959-6526, E-ISSN 1879-1786, Vol. 104, p. 460-467Article in journal (Refereed)
    Abstract [en]

    Renewable waste-based fuels may decrease the resource use and environmental impact of the road transport sector; one of the options is biogas produced via anaerobic digestion of waste streams from pulp and paper mills. This paper describes process simulation and economic assessments for two options for integrating anaerobic digestion and production of liquid biogas in a typical Nordic Kraft pulp mill: (1) a high-rate anaerobic reactor in the wastewater treatment, and (2) an external anaerobic stirred tank reactor for the treatment of primary and secondary sludge as well as Kraft evaporator methanol condensate. The results revealed an annual production potential of 26-27 GWh biogas in an average Nordic Kraft pulp mill, which is equivalent to a daily production of 7600 L of diesel in terms of energy, and the production cost was estimated to €0.47-0.82 per litre diesel equivalent, comparable with the Swedish price of €0.68 per litre diesel. However, for the cases with liquid biogas (LBG), a discounted payback period of about 8 years may not be considered profitable by the industry. Other pre-requisites may, however, improve the profitability: a larger mill; production of compressed biogas instead of liquid biogas; or, for case 1, a comparison with the alternative cost for expanding the wastewater treatment capacity with more process equipment for activated sludge treatment. The results reveal that anaerobic digestion at pulp mills may both expand the production of renewable vehicle fuel but also enable increased efficiency and revenue at Kraft pulp mills.

  • 286. Larsson, P. A.
    et al.
    Hoc, Miroslav
    RISE, Innventia.
    Wågberg, L.
    A novel approach to study the hydroexpansion mechanisms of paper using spray technique2009In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 24, no 4, p. 371-380Article in journal (Refereed)
    Abstract [en]

    A new method has been developed to measure the dimensional stability of printing paper by measuring the impact of liquid water on the in-plane dimensional change, i.e. the hydroexpansion, without any simultaneous mechanical interference that can occur when water is pressed into the sheet. This was achieved by using a specially developed spray technique and using electronic speckle photography to continuously measure the dimensional change as water is applied. The in-plane expansion for a given change in moisture content was found to be lower in the case of hydroexpansion than for earlier reported hygroexpansion. After the initial expansion following the water application, it was found that sheets rapidly start to contract again already 10-20 seconds after being wetted, i.e. despite still having a fairly constant and significantly higher moisture content than the initial moisture content before water application. These effects suggest that there are different mechanisms behind hydroexpansion than hygroexpansion of paper, and that hygroexpansion measurements should be extrapolated with caution when evaluating papers with respect to printability.

  • 287.
    Larsson, Per Tomas
    RISE, Innventia.
    Solid state NMR as a tool for measuring pore sizes in water swollen cellulose fibre walls2013Conference paper (Refereed)
  • 288.
    Larsson, Per Tomas
    et al.
    RISE, Innventia.
    Syverud, Kristin
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Wohlert, Jakob
    KTH Royal Institute of Technology, Sweden.
    Bergenstråhle, Malin
    KTH Royal Institute of Technology, Sweden.
    Changes in the supra-molecular structure of cellulose I during TEMPO-oxidation: bringing together NMR, MD and XRD results2016In: The 7th Workshop on cellulose, regenerated cellulose and cellulose derivatives, 2016, p. 35-35, article id 9Conference paper (Other academic)
  • 289.
    Larsson, P.T.
    et al.
    RISE, Innventia.
    Salmen, L.
    RISE, Innventia.
    Influence of cellulose supramolecular structure on strength properties of chemical pulp2014In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 68, no 8, p. 861-866Article in journal (Refereed)
  • 290.
    Larsson, P.T.
    et al.
    RISE, Innventia.
    Svensson, A.
    Wågberg, L.
    A new, robust method for measuring average fibre wall pore sizes in cellulose I rich plant fibre walls2013In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, no 2, p. 623-631Article in journal (Refereed)
  • 291.
    Lecourt, Micheal
    et al.
    FCBA, France.
    Pöhler, Tiina
    VTT, Finland.
    Hornatowska, Joanna
    RISE - Research Institutes of Sweden, Bioeconomy.
    Salmen, Lennart
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Jetsu, Petri
    VTT, Finland.
    Density profiles of novel kraft pulp and TMP based foam formed thermal insulation materials observed by X-ray tomography and densitometry2018In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 72, no 5, p. 397-403Article in journal (Refereed)
    Abstract [en]

    X-ray tomography and densitometry (XRT and XRD) were applied to characterise wood fibre based insulation materials, which were produced by the foam forming technology. XRT is a high resolution approach with long measurement times of around 29 h, while XRD measurement needs only a few minutes. The determination of density distribution of boards in the thickness direction was the focus of this study. Both approaches visualised well the impact of raw materials and manufacturing processes on the structure of the panels. The density profiles were dependent on the pulp applied for panel production, and the processing conditions were also influential. Air flow resistance correlated with the maximum density measured inside the board. Both XRT and XRD revealed similar trends, which are useful for the characterisation of insulation materials.

  • 292.
    Li, Dongfang
    et al.
    KTH Royal Institute of Technology, Sweden.
    Iversen, Tommy
    RISE, Innventia. KTH Royal Institute of Technology, Sweden.
    Ek, Monica
    KTH Royal Institute of Technology, Sweden.
    Treatment of a cellulose fiber surface with a suberin monomer-derived polymer2015In: Polymers from Renewable Resources, ISSN 2041-2479, Vol. 6, no 3, p. 75-90Article in journal (Refereed)
    Abstract [en]

    The biorefinery concept requires the development of value-added products, such as materials from biomass, including bark. Suberin is the most abundant component in birch (Betula verrucosa) outer bark and acts as a barrier against the penetration of water and external attacks from microorganisms. The aliphatic domain of suberin is rich in hydroxy fatty acids, such as cis-9,10-epoxy-18- hydroxyoctadecanoic acid. In this study, it was isolated from the outer bark of birch and polymerized to prepare polyepoxy acid (PEA), which was used to impregnate filter papers. After complete drying, PEA-loaded filter papers were placed under UV to crosslink the epoxides through cationic polymerization with a diaryliodonium salt as the photo-initiator. The crosslinking was evaluated using Fourier transform infrared (FTIR) spectroscopy and differential scanning calorimetry (DSC). The materials obtained after UV curing showed substantially increased hydrophobicity, decreased moisture absorption, increased tensile strength, and increased ductility. Field-emission scanning electron microscopy (FE-SEM) showed that the crosslinked PEA covered the surface of the cellulose fibers and filled the interstitial spaces.

  • 293.
    Li, Jiebing
    RISE, Innventia.
    Carbonised adsorbents from softwood kraft lignin2014Conference paper (Refereed)
  • 294.
    Li, Jiebing
    et al.
    RISE - Research Institutes of Sweden, Bioeconomy. KTH Royal Institute of Technology, Sweden.
    Wang, Miao
    RISE - Research Institutes of Sweden, Bioeconomy. KTH Royal Institute of Technology, Sweden.
    She, Diao
    RISE - Research Institutes of Sweden, Bioeconomy. Chinese Academy of Sciences & Ministry of Water Resources, China.
    Zhao, Yadong
    KTH Royal Institute of Technology, Sweden.
    Functionalization of softwood kraft lignin for coating urea as highly efficient nitrogen fertilizer2017In: The 7th Nordic Wood Biorefinery Conference held in Stockholm, Sweden, 28-30 Mar. 2017: NWBC 2017, Stockholm: RISE Bioekonomi , 2017, p. 244-245Conference paper (Refereed)
    Abstract [en]

    An industrial softwood kraft lignin (SKL) was blended with polylactic acid (PLA) and used for complex coating of urea as nitrogen fertiliser. The coating was perfumed using a simple and cheap dip-coating technique. The lignin was pre-functionalised via esterification or Mannich reaction. Esterification rendered a lignin derivative with higher hydrophobicity, while the Mannich reaction introduced organically bound nitrogen onto the lignin derivative structure. It was found that the coating resulted in good attachment of the coating layer on the surface of urea pellets. The coating layer was very compact and the wall layer was rather homogeneous and well distributed. The urea coating not only constructed a physical barrier to delay urea dissolution (controlled release), but also supplied chemically slow-release, organically bound nitrogen and biological stabilisation effects. It was found that the Mannich reaction product (ManSKL/PLA) slowed down the urea release more than the PLA coating reference, taking approximately 1m000s or 6.7 times as long

  • 295. Li, X.
    et al.
    Liu, J.H.
    Wei, X.F.
    Huang, B.Q.
    Zhang, F.Z.
    Yang, Li
    RISE, Innventia.
    Research on the permeability of ink in offset paper2014In: Applied Mechanics and Materials, ISSN 1660-9336, E-ISSN 1662-7482, Vol. 469, p. 313-317Article in journal (Refereed)
  • 296.
    Lindberg, Siv M
    et al.
    RISE, Innventia.
    Hansen, Peeter
    RISE, Innventia.
    Drotz, Mattias
    RISE, Innventia.
    Kihlstedt, Annika
    RISE, Innventia.
    Rosén, Fredrik
    RISE, Innventia.
    Tactile and instrumental characterization of tissue products2015Conference paper (Other academic)
    Abstract [en]

    The feeling of softness and smoothness of paper tissue products is an important performance factor in the market place. In a series of panel tests, the relationship between instrumental measurements and perceived softness and smoothness was investigated. Samples of tissue base paper – napkin and toilet paper – were evaluated for surface roughness. The samples were placed on a hard, smooth glass substrate and the respondents used one finger to stroke along the sample surface. Instrumental measurement and characterization were performed using differentinstruments: Emtec TSA and Lena Softness Tester. The results divide the base paper material into product groups, but general mathematical relationships could be found between the test panel and the measurements when normalized in different ways. Measurements using the Lena produced the best correlation with the panel ratings because its principle resembled the method of the test panel most closely. However, a general relationship usingmaterial properties was shown to produce as good an estimator for the surface roughness as the results obtained with the Lena. This relationship consisted of the ratio between the plasticity and the elasticity of the tissue paper (in-plane properties), normalized for thickness. This suggests that those three material properties are fundamental to the perception of surface roughness as evaluated in this study. Using a trained haptic panel to evaluate test samples of similar grammage with variations in furnish and machine operation settings generated a good correlation to the TSA measurement (r=0.9). The panel was more susceptible to variation in furnish than variation in peak pressure, and this was particularly evident for samples evaluated on the Yankee side.

  • 297.
    Lindberg, Siv M
    et al.
    RISE, Innventia.
    Lindström, Annika
    RISE, Innventia.
    Cederström, Caroline
    RISE, Innventia.
    From, Anders
    Westerlind, Christine
    Shoppers' attention to packaging and in-store media2013Conference paper (Refereed)
  • 298.
    Lindgren, Karin
    et al.
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Kulander, Ida
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Törngren, Per
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Bialik, Marta
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Soap separation: a new option for removal of NPEs2018In: Technical solutions for today and beyond: TAPPI PEERS conference, 2018, p. 154-159Conference paper (Other academic)
  • 299.
    Lindgren, Karin
    et al.
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Kulander, Ida
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Törngren, Per
    RISE - Research Institutes of Sweden, Bioeconomy, Biobased Materials.
    Bialik, Marta
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Soap separation: A new option for removal of NPEs2018In: Pulping Engineering and Environmental Recycling Sustainability Conference, PEERS 2018: Technical Solutions for Today and Beyond, TAPPI Press , 2018, p. 272-277Conference paper (Other academic)
    Abstract [en]

    Non-process elements (NPEs) are elements present in the process streams without taking part in the desired reaction. With increasing process closure and new NPE-rich input streams such as gasified bark in the lime kiln and the destruction of biosludge in the recovery boiler, the traditional purge points may prove insufficient. A new method to remove NPEs is suggested: Removal of NPEs from tall oil brine. The idea is based on the fact that many elements are enriched in the soap and separated from the black liquor but are later led back to the black liquor with the brine. The results showed strong enrichment of Ba, Ca, Mg, Mn, P and Zn in soap; an enrichment factor of 8 or higher was observed. Laboratory experiments where tall oil brine has been alkalized and subjected to a separation stage have been conducted. The laboratory experiments showed that more than 90% of Al, Ba, Mg, Mn and P precipitates and could be removed with the solid phase if alkalized to pH 11. The separation efficiency varied for Ca and Si from 70-85 %. To conclude, removal of non-process elements from tall oil brine is a promising new kidney, especially for P and Si.

  • 300.
    Lindgren, Karin
    et al.
    RISE, Innventia.
    Samuelsson, Åsa
    RISE, Innventia.
    Kulander, Ida
    RISE, Innventia.
    Full mill model for dissolving pulp based biorefinery2015Conference paper (Other academic)
    Abstract [en]

    Material and energy balances of a modern theoretical dissolving softwood kraft pulp mill, using pre-hydrolysis in water, have been established. The mill produces 1000 ADt/day and there is an energy excess in the mill that could be used to produce power. If lignin is removed with the LignoBoost process the recovery boiler is unloaded enabling an increased pulp production. With a lignin removal of 0.2 ton/ADt the pulp production could increase 8.5%. According to a sensitivity analysis the lignin price has the largest impact on the economic performance.

3456789 251 - 300 of 552
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
v. 2.35.8