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  • 1.
    Bohlin, Christina
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemistry and Biomedical Sciences.
    Jönsson, Leif J
    Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Lundquist, K
    Oxidation of the erythro and threo forms of the phenolic lignin model compound 1-(4-hydroxy-3-methoxyphenyl)-2-(2-methoxyphenoxy)-1,3-propanediol by laccases and model oxidants2009In: Bioorganic chemistry (Print), ISSN 0045-2068, Vol. 37, no 5, 143-148 p.Article in journal (Refereed)
    Abstract [en]

    Mixtures of equal amounts of the erythro and threo forms of the phenolic arylglycerol β-aryl ether 1-(4-hydroxy-3-methoxyphenyl)-2-(2-methoxyphenoxy)-1,3-propanediol were oxidized (i) with laccases from Trametes versicolor, Agaricus bisporus, Myceliophthora thermophila and Rhus vernicifera, (ii) with laccase-mediator systems consisting of T. versicolor laccase and ABTS or HBT, and (iii) with various model oxidants including cerium(IV) ammonium nitrate (CAN), lignin peroxidase, Fenton’s reagent, and lead(IV) tetraacetate (LTA). All the laccases exhibited a similar preferential degradation of the threo form. The mediator ABTS counteracted the threo preference of laccase, but the mediator HBT did not affect it. The outer-sphere model oxidants CAN and lignin peroxidase showed a preferential degradation of the threo form. LTA and Fenton’s reagent did not exhibit any stereo-preference. The results suggest that laccases of different origin, primary structure, and redox potential behave as typical outer-sphere oxidants in their interaction with the diastereomers of the arylglycerol β-aryl ether

  • 2. Breen, Chris
    et al.
    Johansson, Caisa
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences, Paper Surface Centre.
    Thompson, Simon
    Black, Leon
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Using clays to enhance the barrier properties of sustainable paper coatings2008Conference paper (Other (popular science, discussion, etc.))
  • 3.
    Carlsson, Gunilla
    et al.
    Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Department of Chemistry and Biomedical Sciences. Karlstad University, Faculty of Technology and Science, Materials Science.
    Rådberg, Weronica
    Ljungqvist, Carl-Henrik
    Axrup, Lars
    Determination of Distribution of Fines in a Paper Structure using Fluorescence Microscopy and Image Analysis2010Conference paper (Refereed)
    Abstract

    When making paper a sheet is formed by draining a specific amount of dilute water suspension of pulp through a wire-cloth. The procedure is well known but the underlying mechanisms are not fully understood. The different particles such as fines, fibers, retention aids and other additives interact with each other during the process. These interactions are important since they impact the properties of the formed paper. The fibers have different sizes and the finest particle fraction is called fines. The fines used in this study are from bleached kraft pulp and are therefore oxidized to some extent.

    By labelling the fines with a fluorophore the movements of individual fines can be followed with video-based fluorescence microscopy even if the size of the fines is below the microscopes resolution limit. [1-3] The fluorophores that has been used are N-Methylisatoic anhydride and fluorescein-5-thiosemicarbazide. N-Methylisatoic anhydride reacts directly with hydroxyl groups on the cellulose chain. Fluorescein-5-thiosemicarbazide reacts with groups like aldehydes and ketones in the cellulose chain, so the chain has to be oxidized before the labeling process. These two fluorephores have different absorption and emission wavelengths. [4]

    The methods for labeling the fibers are easy to perform. The labeled fiber can be seen in the microscope. One problem is that the fibers aggregate, probably due to the method used for labeling. Another problem can be the fading of the flourophores. Both problems will be further investigated. [5]

    The elevated drying process in the paper machine makes it difficult to understand the mechanisms involved. Within this project the understanding will be built up in many steps. The first step is to study the labeled fibers in water. A model system containing fibers and latex will be used to study the behavior in different environments such as different electrolyte concentration and pH.



    References

    [1] Carlsson G., Warszynski P., van Stam J., J. Colloid Interface Sci., 2003, 267, 500-508

    [2] Carlsson G., van Stam J., Nord. Pulp Pap. Res. J., 2005, 20, 192-199

    [3] Carlsson G., Järnström L., van Stam J., J. Colloid Interface Sci., 2006, 298, 162-171

    [4] DeAngelis P. L., Analytical Biochemistry, 2000, 284, 167-169

    [5] Rådberg W., Bsc thesis, Karlstad university, 2010

  • 4.
    Carlsson, Gunilla
    et al.
    Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Department of Chemistry and Biomedical Sciences. Karlstad University, Faculty of Technology and Science, Materials Science.
    van Stam, Jan
    Karlstad University, Faculty of Technology and Science, Department of Chemistry and Biomedical Sciences. Karlstad University, Faculty of Technology and Science, Materials Science.
    Fredriksson, Lars
    Normal and anomalous diffusion2010Conference paper (Refereed)
    Abstract

    Brownian motion is perhaps best described as the never-ceasing phenomenon responsible for

    self-diffusion occurring although there is no temperature or concentration gradients. The

    distribution of the steps P(r) is vital in order to see the underlying mechanism of diffusion.

    Normal diffusion is characterised by having Gaussian distributions of the step lengths.

    Diffusion can be classified as either normal or anomalous depending on how the mean square

    displacement is related to time:



    If a = 1, diffusion is classified as normal diffusion. With a > 1 , there is superdiffusion. When

    a < 1 , subdiffusion takes place. In order to replace normal diffusion by anomalous diffusion,

    pathologies must be present. Most anomalous diffusion takes the shape of subdiffusion

    [1, 2].

    Video-based fluorescence microscopy is the basis for all experimental work and has

    successfully been used earlier [3-5]. For each concentration the trajectories of 60 probes were

    determined using the built-in Particle Analysis function in Aquacosmos 2.6. The 6000 data

    points collected were used to extract both the coefficient G and the exponenta .

    Relatively few studies have been devoted to tell normal diffusion from anomalous diffusion in

    real chemical systems. In this study the probe is a fluorescent labeled latex particle, the matrix

    was changed in different ways. Unlabelled latex particles, DoTAB (a cationic surfactant),

    cationic starch of different molecular weight were all used to alter the sample.

    The conclusion is that it is safe to assume a = 1 in all cases except for very high

    concentrations of starch, where diffusion is hindered by the viscous matrix, which gives rise

    to subdiffusion. Moreover, all distributions are Gaussian except for the highest concentrations

    of starch and latex. In these latter cases, distributions appear as truncated normal distributions

    [6,7].

    References

    [1] Klafter J., Blumen A., Zumofen g. Shlesinger M.f., Physica A., 1990, 168, 637-645

    [2] Ott A., Bouchaud J.P., Langevin D., Urbach W., Phys. Rev. Lett., 1990, 65, 2201-2204

    [3] Carlsson G., Warszynski P., van Stam J., J. Colloid Interface Sci., 2003, 267, 500-508

    [4] Carlsson G., van Stam J., Nord. Pulp Pap. Res. J., 2005, 20, 192-199

    [5] Carlsson G., Järnström L., van Stam J., J. Colloid Interface Sci., 2006, 298, 162-171

    [6] Fredriksson L., Bsc thesis, Karlstad university, 2010

    [7] Fredriksson L., Msc thesis, Karlstad university, 2010

  • 5.
    Chatterjee, Robin
    et al.
    Department of Chemistry, Umeå University.
    Johansson, Kristin
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Jönsson, Leif J.
    Department of Chemistry, Umeå University.
    Evaluation of the potential of fungal and plant laccases for active-packaging applications2011In: Journal of Agricultural and Food Chemistry, ISSN 0021-8561, E-ISSN 1520-5118, Vol. 59, no 10, 5390-5395 p.Article in journal (Refereed)
    Abstract [en]

    Laccases from Trametes versicolor (TvL), Myceliophthora thermophila (MtL), and Rhus vernicifera (RvL) were investigated with regard to their potential utilization as oxygen scavengers in active packages containing food susceptible to oxidation reactions. The substrate selectivity of the laccases was investigated with a set of 17 reducing substrates, mainly phenolic compounds. The temperature dependence of reactions performed at low temperatures (4-31 C) was studied. Furthermore, the laccases were subjected to immobilization in a latex/clay matrix and drying procedures performed at temperatures up to 105 C. The results show that it is possible to immobilize the laccases with retained activity after dispersion coating, drying at 75-105 C, and subsequent storage of the enzyme-containing films at 4 C. TvL and, to some extent, MtL were promiscuous with regard to their reducing substrate, in the sense that the difference in activity with the 17 substrates tested was relatively small. RvL, on the other hand, showed high selectivity, primarily toward substrates resembling its natural substrate urushiol. When tested at 7 C, all three laccases retained 20% of the activity they had at 25 C, which suggests that it would be possible to utilize the laccases also in refrigerated food packages. Coating and drying resulted in a remaining enzymatic activity ranging from 18 to 53%, depending on the drying conditions used. The results indicate that laccases are useful for active-packaging applications and that the selectivity for reducing substrates is an important characteristic of laccases from different sources. 2011 American Chemical Society.

  • 6.
    Christophliemk, Hanna
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
    Ullsten, Henrik
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
    Johansson, Caisa
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences, Paper Surface Centre.
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Exploiting the synergies between starch, nanoclay and other additives to enhance the barrier properties of paper; Starch coatings - striking balance between the benefits and the drawbacks2011Conference paper (Other academic)
  • 7. De Magistris, F.
    et al.
    Germgård, Ulf
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
    Beghello, Luciano
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Lestelius, Magnus
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences, Paper Surface Centre.
    Influence of paper compressibility on flexographic printing quality2008In: Progress in paper physics seminar 2008, proceedings, Espoo, Finland, 2-5 June 2008 / [ed] Kotomaki K, Koivunen K, Paulapuro H,, 2008, 243-245 p.Conference paper (Other (popular science, discussion, etc.))
    Abstract [en]

    The compression ability of fibres and fibre networks were investigated. The surface and bulk compressions of paper influence calendering, coating, surface sizing ability and the penetration of ink in printing. Two kraft pulps (spruce) were produced in the laboratory to obtain pulps with different levels of xylan. Using those kraft pulps alone or mixed with 50% of a commercial TMP pulp, single-layer sheets were formed in a Formette Dynamique sheet former. The pulps and mixture levels were chosen to obtain papers with systematically altered property variation but with constant grammage. The papers were characterized according to both bulk and surface compressibility. The papers were printed in a flexo IGTF1 laboratory printing press and the transferred amount of ink, dot gain, and mottling were analyzed.

  • 8.
    De Magistris, Federica
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Department of Energy, Environmental and Building Technology.
    Germgård, Ulf
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
    Beghello, Luciano
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Lestelius, Magnus
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Effect of calendering on the compressibility of papers made with fibre of various properties2010Conference paper (Other (popular science, discussion, etc.))
    Abstract [en]

    The surface and bulk compressibility of a given paper influence its calendering, coating, surface sizing and printing properties. This study aims at a deeper knowledge of which variable affects the compressibility of paper sheets and how calendering effect different sheet properties. The pulps were characterized by their chemical compositions and physical properties. The bulk compressibility, the surface compressibility and the thickness were evaluated both before and after calendering

  • 9.
    De Magistris, Federica
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
    Germgård, Ulf
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
    Beghello, Luciano
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Lestelius, Magnus
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences, Paper Surface Centre.
    Influence of Fibre Characteristics of the Surface Roughness of Paper and on Flexographic Print Quality2010Conference paper (Refereed)
  • 10.
    Hallbäck, Nils
    et al.
    Karlstad University, Faculty of Technology and Science, Materials Science. Karlstad University, Faculty of Technology and Science, Department of Mechanical and Materials Enineering.
    Korin, Christer
    Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Vähä-Nissi, Mika
    Seppänen, Rauni
    Laine, Christiane
    Influence of paperboard on bond formation and strength of adhesive joint2009Conference paper (Refereed)
    Abstract

    Knowledge about the glueability of fiber-based materials is limited. Factors affecting the adhesive joint between adhesive and paperboard are presented here through two cases: strength of hot melt adhesive joint and consolidation of dispersion adhesive. The hot melt joint was investigated by Y-peel testing, while shear testing was applied for dispersion adhesives. A set of supplementing tools was used to understand the adhesive joints, their development and failure. The results show, for example, the importance of paperboard roughness on the hot melt joint strength. Formation of an adhesive joint with dispersion adhesives is affected by the rheological properties of the adhesive layer and the structure and absorbation properties of the board surface. Both case studies indicate that it can actually be better to apply the adhesive first on a rough surface and the press the smooth surface on the adhesive, which is in contrast with the common practice today

  • 11.
    Heidkamp, Hannah
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemistry and Biomedical Sciences. Karlstad University, Faculty of Technology and Science, Materials Science.
    Carlsson, Gunilla
    Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Department of Chemistry and Biomedical Sciences. Karlstad University, Faculty of Technology and Science, Materials Science.
    van Stam, Jan
    Karlstad University, Faculty of Technology and Science, Department of Chemistry and Biomedical Sciences. Karlstad University, Faculty of Technology and Science, Materials Science.
    Latex particle behavior studied in the wet state with fluorescence microscopy2010Conference paper (Refereed)
    Abstract

    Dispersions of latex are often used as model systems due to the well known properties of the latex particles. They can be made with a monodisperse distribution, different extent of cross linking and different surface charges. The behavior of latex particles in the wet state is important for both film formation and understanding what happens in the system when different additives are introduced. Latex is used in many different blends and one common additive is surfactants, both for stabilization during manufacturing and for adjusting the system features in different applications. A suitable method for studying latex dispersions in wet state is fluorescence microscopy. By adding latex particles with similar size and charge, marked with a fluorophore, particle movements can be followed even if the particle radius is below microscope resolution limit. This can be used for studying particle behavior in dispersions with different additives, in order to see how the additives affect the latex particles.



    By measuring the latex particles displacement, diffusion coefficients can be determined. This has been successfully used for both high and low latex volume fractions [1-3]. Since surfactants are a common additive, the focus in our studies lies on interactions between surfactants and negatively charged latex. When DoTAB (dodecyl trimethyl ammonium bromide), a cationic surfactant, is added to the latex dispersion, an interesting behavior can be seen. Both diffusion coefficients and conductivity measurements show that at a certain concentration, when DoTAB has neutralized the latex particles, aggregates are formed. When the DoTAB concentration is raised even more, the aggregates dissolve. Light scattering measurements give the same indications.



    Combined with other studies, such as film formation, the particle behavior gives important information about what happens in the system when different concentration of both latex and additives are used.



    [1] Carlsson G., Warszynski P. and van Stam J., J. Colloid Interface Sci., 2003, 267, 500-508 [2] Carlsson G., Järnström L. and van Stam J., J. Colloid Interface Sci., 2006, 298, 162-171

    [3] Carlsson G. and van Stam J., Nord. Pulp Pap. Res. J., 2005, 20, 192-199

  • 12.
    Javed, Asif
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
    Ullsten, Henrik
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
    Ernstsson, Marie
    SP Technical Research Institute of Sweden, SP Chemistry, Materials and Surfaces.
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Study of starch and starch-PVOH blends and effects of plasticizers on mechanical and barrier properties of coated paperboardManuscript (preprint) (Other academic)
  • 13.
    Johansson, Caisa
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Composite Multilayer Coatings for Improved Barrier Properties of Packaging Board2010In: Composite Laminates: Properties, Performance and Applications / [ed] A. Doughett and P. Asnarez, New York, USA: Nova Science Publishers Inc , 2010, 83-119 p.Chapter in book (Refereed)
  • 14.
    Johansson, Caisa
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Bio-nanocomposites for food packaging applications2011In: Nanocomposites with biodegradable polymers Synthesis, Properties and Future Perspectives / [ed] Vikas Mittal, Oxford: Oxford University Press , 2011, 348-367 p.Chapter in book (Refereed)
  • 15.
    Johansson, Caisa
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Bohlin, Erik
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Surface characterization and model verification2009Conference paper (Other (popular science, discussion, etc.))
  • 16.
    Johansson, Caisa
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Bohlin, Erik
    Coppel, Ludovic
    Edström, Per
    Calendering of coated polyester film - characterization and modeling2010Conference paper (Other (popular science, discussion, etc.))
  • 17.
    Johansson, Caisa
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Bohlin, Erik
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Coppel, Ludovic
    Edström, Per
    Modelling of coating brightness: Impact of micro-roughness and effective refractive index2011Conference paper (Other (popular science, discussion, etc.))
  • 18.
    Johansson, Caisa
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences, Paper Surface Centre.
    Johnson, Johanna
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Photopolymer printing plates: Changes in performance and properties2011In: Flexo & Gravure International, Vol. 17, no 1, 6-8 p.Article in journal (Other academic)
  • 19.
    Johansson, Caisa
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences, Paper Surface Centre.
    Jonhed, Anna
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Composition and film properties of temperature responsive, hydrophobically modified potatio starch2008In: Starch: international journal for the investigation, processing and use of carbohydrates and their derivatives, ISSN 0038-9056, Vol. 60, no 10, 539-550 p.Article in journal (Refereed)
  • 20.
    Johansson, Caisa
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences, Paper Surface Centre.
    Lestelius, Magnus
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Johnson, Johanna
    Rättö, Peter
    Blohm, Erik
    Some properties of flexographic printing plates and aspects of print quality2009In: Appita journal, ISSN 1038-6807, Vol. 62, no 5, 371-378 p.Article in journal (Refereed)
  • 21.
    Johansson, Kristin
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
    Christophliemk, Hanna
    Energy and Process Engineering, Tampere University of Technology.
    Johansson, Caisa
    Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
    Jönsson, Leif J.
    Kemiska institutionen, Department of Chemistry, Umeå Universitet.
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    The effects of coating structure and water-holding capacity on the oxygen-scavenging ability of enzymes embedded in the coating layer2013In: TAPPI Journal, ISSN 0734-1415, Vol. 12, no 6, 43-52 p.Article in journal (Refereed)
    Abstract [en]

    Enzymes catalyzing oxygen scavenging were embedded in latex-based coatings with and without barrier kaolin clay to produce material for active packages. The clay was used to create a porous structure, and the closed-structure matrix consisted of a biopolymer comprising either starch or gelatin to increase the water uptake of the coating. The effects of the porous open structure and of the water uptake of the coated layer on the oxygen-scavenging ability of the embedded enzymes were examined at both 75% and 100% relative humidity. The results showed that the porous clay structure led to higher oxygen-scavenging capacity than that of a closed structure at both test conditions by enabling a high diffusion rate for oxygen and glucose to the active sites of the enzymes. The addition of a water-holding biopolymer did not always significantly affect the oxygen-scavenging capacity. However for a less-porous layer at 100% relative humidity, an increase in the amount of biopolymer resulted in an increase in oxygen-scavenging capacity. The results were treated statistically using multiple-factor analysis where the most important factor for the oxygen-scavenging ability was found to be the addition of clay. The coatings were also characterized with respect to water vapor uptake, overall migration, porosity, and scanning electron microscopy images.

  • 22.
    Johansson, Kristin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Christophliemk, Hanna
    Energy and Process Engineering, Tampere University of Technology.
    Jönsson, Leif J.
    Kemiska institutionen, Department of Chemistry, Umeå Universitet.
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Effect of Pigment Volume Concentration and Drying Aspects on the Enzyme Activity of Clay Coatings2010In: TAPPI 11th Advance Coating Fundamentals Symposium Proceedings: Chapter 6.1, Atlanta: TAPPI press , 2010Conference paper (Refereed)
  • 23.
    Johansson, Kristin
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
    Christophliemk, Hanna
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
    Jönsson, Leif
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Effect of pigment volume concentration and drying aspects on the enzyme activity of clay coatings2010In: 11th Advanced Coating Fundamentals Symposium Proceedings, The Latest Advances in Coating Research and Development, 11.-13. October, Munich, Germany, TAPPI Press, 2010, 129-143 p.Conference paper (Refereed)
  • 24. Johansson, Kristin
    et al.
    Christophliemk, Hanna
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
    Jönsson, Leif
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Effect of Pigment Volume Concentration and Drying Aspects on the Enzyme Activity of Clay Coatings2010Conference paper (Other academic)
  • 25.
    Johansson, Kristin
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences. Karlstad Univ, Dept Chem Engn, SE-65188 Karlstad, Sweden..
    Gillgren, Thomas
    Umea Univ, Dept Chem, SE-90187 Umea, Sweden..
    Winestrand, Sandra
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences. Umea Univ, Dept Chem, SE-90187 Umea, Sweden..
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Jonsson, Leif J.
    Umea Univ, Dept Chem, SE-90187 Umea, Sweden..
    Comparison of lignin derivatives as substrates for laccase-catalyzed scavenging of oxygen in coatings and films2014In: Journal of Biological Engineering, ISSN 1754-1611, E-ISSN 1754-1611, Vol. 8, 1Article in journal (Refereed)
    Abstract [en]

    Background: Lignin derivatives are phenylpropanoid biopolymers derived from pulping and biorefinery processes. The possibility to utilize lignin derivatives from different types of processes in advanced enzyme-catalyzed oxygen-scavenging systems intended for active packaging was explored. Laccase-catalyzed oxidation of alkali lignin (LA), hydrolytic lignin (LH), organosolv lignin (LO), and lignosulfonates (LS) was compared using oxygen-scavenging coatings and films in liquid and gas phase systems. Results: When coatings containing lignin derivatives and laccase were immersed in a buffered aqueous solution, the oxygen-scavenging capability increased in the order LO < LH < LA < LS. Experiments with coatings containing laccase and LO, LH or LA incubated in oxygen-containing gas in air-tight chambers and at a relative humidity (RH) of 100% showed that paperboard coated with LO and laccase reduced the oxygen content from 1.0% to 0.4% during a four-day period, which was far better than the results obtained with LA or LH. LO-containing coatings incubated at 92% RH also displayed activity, with a decrease in oxygen from 1.0% to 0.7% during a four-day period. The oxygen scavenging was not related to the content of free phenolic hydroxyl groups, which increased in the order LO < LS < LH < LA. LO and LS were selected for further studies and films containing starch, clay, glycerol, laccase and LO or LS were characterized using gel permeation chromatograpy, dynamic mechanical analysis, and wet stability. Conclusions: The investigation shows that different lignin derivatives exhibit widely different properties as a part of active coatings and films. Results indicate that LS and LO were most suitable for the application studied and differences between them were attributed to a higher degree of laccase-catalyzed cross-linking of LS than of LO. Inclusion in active-packaging systems offers a new way to utilize some types of lignin derivatives from biorefining processes.

  • 26.
    Johansson, Kristin
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
    Gillgren, Thomas
    Umeå Universitet.
    Winestrand, Sandra
    Umeå Universitet.
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
    Jönsson, Leif J.
    Umeå Universitet.
    Comparison of lignin derivatives as substrates for laccase-catalyzed scavenging of oxygen in coatings and filmsManuscript (preprint) (Other academic)
    Abstract [en]

    Background: Lignin derivatives are phenylpropanoid biopolymers derived from pulping and biorefinery processes. The possibility to utilize lignin derivatives from different types of processes in advanced enzyme-catalyzed oxygen-scavenging systems intended for active packaging was explored. Laccase-catalyzed oxidation of alkali lignin (LA), hydrolytic lignin (LH), organosolv lignin (LO), and lignosulfonates (LS) was compared using oxygen-scavenging coatings and films in liquid and gas phase systems.

    Results: When coatings containing lignin derivatives and laccase were immersed in a buffered aqueous solution, the oxygen-scavenging capability increased in the order LO < LH < LA < LS. Experiments with coatings containing laccase and LO, LH or LA incubated in oxygen-containing gas in air-tight chambers and at a relative humidity (RH) of 100% showed that paperboard coated with LO and laccase reduced the oxygen content from 1.0% to 0.4% during a four-day period, which was far better than the results obtained with LA or LH. LO-containing coatings incubated at 92% RH also displayed activity, with a decrease in oxygen from 1.0% to 0.7% during a four-day period. The oxygen scavenging was not related to the content of free phenolic hydroxyl groups, which increased in the order LO < LS < LH < LA. LO and LS were selected for further studies and films containing starch, clay, glycerol, laccase and LO or LS were characterized using gel permeation chromatograpy, dynamic mechanical analysis, and wet stability.

    Conclusions: The investigation shows that different lignin derivatives exhibit widely different properties as a part of active coatings and films. Results indicate that LS and LO were most suitable for the application studied and differences between them were attributed to a higher degree of laccase-catalyzed cross-linking of LS than of LO. Inclusion in active-packaging systems offers a new way to utilize some types of lignin derivatives from biorefining processes.

  • 27.
    Johansson, Kristin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Jönsson, Leif J.
    Department of Chemistry, Umeå University.
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Oxygen scavenging enzymes in coatings: Effect of coating procedures on enzyme activity2011In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 26, no 2, 197-204 p.Article in journal (Refereed)
    Abstract [en]

    The oxygen content in food packaging may be reduced by attaching oxygen scavengers to the packaging material. The critical parameters that determine the oxygen-scavenging ability of an enzyme-based coating i.e. pH, heat and coating color formulation were evaluated. Glucose oxidase, catalase and glucose were added to latex dispersions in the preparation of the coating colors. The enzymes were entrapped in the coating layers after coating and drying. The clay concentration and drying conditions were varied and the enzymatic activity of the coated layer was evaluated. The need for a pH-buffered system was also studied and the results indicated that, when using a carboxylated latex of a standard coating grade, a buffered system was not needed. A rapid drying at a high temperature was preferred over a slow drying at a low temperature in order to prevent pre-oxidation of the substrate in the wet coating color. The scavenging capacity of the coating was dependent on the amount of substrate for the enzyme reaction left after complete drying. The concentration of clay in the coating formulation was shown to have a marked impact on the oxygen-scavenging ability of the coated layer. The enzyme activity was increased by the addition of clay up to a pigment volume concentration (PVC) of ca. 10%. At higher concentrations of clay, the enzyme activity decreased until the critical pigment volume concentration (CPVC) was reached, probably due to the prevention of diffusion of oxygen and consumption of glucose in the coating process before the layer was completely dried. Further additions of clay above the CPVC resulted in an increased enzyme activity, probably due to the creation of a porous structure.

  • 28.
    Johansson, Kristin
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
    Kotkamo, Sami
    Tampere University of Technology.
    Rotabakk, Bjørn Tore
    Nofima.
    Johansson, Caisa
    Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
    Kuusipalo, Jurkka
    Tampere University of Technology.
    Jönsson, Leif J.
    Kemiska institutionen, Department of Chemistry, Umeå Universitet.
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
    Extruded polymer films for optimal enzyme-catalyzed oxygen scavenging2014In: Chemical Engineering Science, ISSN 0009-2509, E-ISSN 1873-4405, Vol. 108, 1-8 p.Article in journal (Refereed)
    Abstract [en]

    The use of enzymes as oxygen scavengers has a great potential in the food packaging industry. Enzymes can be incorporated into a coating layer that can be applied directly onto the packaging material. For the system to be fully functional, there is however a need for the packaging to have some barrier properties, to be sealable through heat, and to ensure low or no migration of the active coating to the food. Various combinations of the polypropylene (PP), poly(lactic acid) (PLA) and low density polyethylene (LDPE) were extruded onto board coated with the oxygen-scavenging enzyme. Properties such as oxygen-transmission rate, water-vapor transmission rate, heat-sealability, migration and oxygen scavenging capacity were evaluated. All combinations of extruded material resulted in a packaging material able to scavenge the oxygen at both 84% and 100% relative humidity. The greatest decrease in oxygen concentration of the head space of air-tight chambers was achieved with the material extruded with PLA on at least one side. It was found that the extruded plastic is necessary in order to meet the EU directives on migration from food packaging materials of not more than a total of 10 mg/dm2 material. All plastics were heat sealable against themselves but not against any of the other plastics and only LDPE adhered strongly to the enzyme-containing coating

  • 29.
    Johansson, Kristin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Winestrand, Sandra
    Kemiska institutionen, Department of Chemistry, Umeå Universitet.
    Johansson, Caisa
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Jönsson, Leif J.
    Kemiska institutionen, Department of Chemistry, Umeå Universitet.
    Oxygen-scavenging coatings and films based on lignosulfonates and laccase2012In: Journal of Biotechnology, ISSN 0168-1656, Vol. 161, no 1, 14-18 p.Article in journal (Refereed)
    Abstract [en]

    Laccase and lignosulfonates were included in coating colors and embedded in latex-based or starch-based films and coatings on foil or board. After 6 days at 23C and 100% relative humidity, the oxygen content in airtight chambers decreased from 1.0% (synthetic gas consisting of 99% N2 and 1% O2) to 0.3% in the presence of board coated with lignosulfonate and laccase, while the oxygen content remained unchanged in control experiments without enzyme. The water stability of lignosulfonate-containing latex-based coatings and starch-based films was improved after laccase-catalyzed oxidation of lignosulfonates, which indicates polymerization to products with lower solubility in water. Furthermore, the E' modulus of starch-based films increased with 30%, which indicates laccase-catalyzed polymerization of lignosulfonates resulting in increased stiffness of the film. The results suggest that laccases and lignosulfonates can be used as an oxygen-scavenging system in active packaging and that enzyme-catalyzed polymerization of lignosulfonates contributes to improved water stability and mechanical properties. 2012 Elsevier B.V.

  • 30.
    Johansson, Kristin
    et al.
    Karlstad Univ, Dept Chem Engn, Karlstad, Sweden..
    Winestrand, Sandra
    Umea Univ, Dept Chem, Umea, Sweden..
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Jonsson, Leif J.
    Umea Univ, Dept Chem, Umea, Sweden..
    Laccase and lignin derivatives as oxygen-scavenging and cross-linking system in renewable active packaging2012In: Abstract of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 243Article in journal (Other academic)
  • 31.
    Johansson, Kristin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Winestrand, Sandra
    Kemiska institutionen, Department of Chemistry, Umeå Universitet.
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Jönsson, Leif J.
    Kemiska institutionen, Department of Chemistry, Umeå Universitet.
    Immobilization of Oxalate Oxidase for Active PackagingManuscript (preprint) (Other academic)
  • 32. Johnson, Johanna
    et al.
    Rättö, Peter
    Blohm, E.
    Lestelius, Magnus
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    The Interaction between Water and Liner and Newsprint in Flexographic CI-Printing2008Conference paper (Other (popular science, discussion, etc.))
  • 33.
    Johnson, Johanna
    et al.
    Karlstad University, Faculty of Technology and Science.
    Rättö, Peter
    Karlstad University, Faculty of Technology and Science.
    Lestelius, Magnus
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Dynamic Nip Pressure in a Flexographic CI-Printing Press2003In: TAGA Proceedings, 2003, 357-374 p.Conference paper (Other academic)
  • 34.
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Barrier coatings based on renewable and synthetic polymers2010Conference paper (Other (popular science, discussion, etc.))
  • 35.
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Oxygen scavenging active packaging by enzyme technology2009Conference paper (Other (popular science, discussion, etc.))
  • 36.
    Järnström, Lars
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Andersson, C.
    Ragnarsson, M.
    Starch polymers in surface treatment of paper and board2008In: Tomorrows Renewable Biopolymers Applications in Bio and packaging Industries III / [ed] H. J. Park and M. S. Hedenqvist, Seoul: Korea University , 2008Chapter in book (Other academic)
  • 37.
    Järnström, Lars
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Beghello, Luciano
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Emilsson, P
    Comparison between a curved soft tip metering element and a conventional blade in the coating of paperboard2010Conference paper (Refereed)
  • 38.
    Järnström, Lars
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Johansson, Caisa
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences, Paper Surface Centre.
    Fogden, A
    Mira, I
    Voit, W
    Zywicki, S
    Bartkowiak, A
    Preparation and incorporation of microcapsules in functional coatings for self-healing of packaging board2009In: Packaging technology & science, ISSN 0894-3214, E-ISSN 1099-1522, Vol. 22, no 5, 275-291 p.Article in journal (Refereed)
  • 39.
    Järnström, Lars
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Johansson, Caisa
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences, Paper Surface Centre.
    Johnson, Johanna
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Ultraviolet-induced aging of flexographic printing plates studied by thermal and structural analysis methods2009In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 112, no 3, 1636-1646 p.Article in journal (Refereed)
  • 40.
    Järnström, Lars
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Johansson, Kristin
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Oxygen scavenging active packaging by enzyme technology2009In: INTERNATIONAL REVIEW OF FOOD SCIENCE AND TECHNOLOGY, no 1, 73-76 p.Article in journal (Refereed)
  • 41.
    Järnström, Lars
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Lestelius, Magnus
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Montibon, Elson
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Preparation of Electroconductive Paper by Deposition of Conducting Polymer2010Conference paper (Other (popular science, discussion, etc.))
  • 42.
    Järnström, Lars
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Montibon, Elson
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Lestelius, Magnus
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Characterisation of poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) (PEDOT:PSS) adsorption on cellulosic materials2009Conference paper (Other (popular science, discussion, etc.))
  • 43.
    Kjellgren, Henrik
    et al.
    Karlstad University, Faculty of Technology and Science.
    Gällstedt, Mikael
    STFI-Packforsk - Packaging and Logistics, Stockholm.
    Engström, Gunnar
    Karlstad University, Faculty of Technology and Science.
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Barrier and Surface Properties of Chitosan-Coated Greaseproof Paper2006In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 65, no 4, 453-460 p.Article in journal (Refereed)
  • 44.
    Land, Cecilia
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Beghello, Luciano
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Stolpe, Lennart
    Wahlström, Torbjörn
    Baggy paper webs - an evaluation of some suggested problem sources2010Conference paper (Other (popular science, discussion, etc.))
  • 45.
    Lestelius, Magnus
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Montibon, Elson
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Preparation of Electroconductive Paper by Deposition of Conducting Polymers2010Conference paper (Other (popular science, discussion, etc.))
  • 46.
    Lestelius, Magnus
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Montibon, Elson
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Characterization of poly(3,4-ethylenedioxythiophene)/poly(styrene sulfonate) (PEDOT:PSS) adsorption on cellulosic materials2009Conference paper (Other (popular science, discussion, etc.))
  • 47.
    Lestelius, Magnus
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Montibon, Elson
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Modification of Paper into Electroconductive Material2010Conference paper (Other (popular science, discussion, etc.))
  • 48.
    Mesic, Behudin Beko
    et al.
    Scion, Rotorua, New Zealand..
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Johnston, James
    Victoria Univ Wellington, Wellington, New Zealand..
    Latex-based barrier dispersion coating on linerboard: Flexographic multilayering versus single step conventional coating technology2015In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 30, no 2, 349-359 p.Article in journal (Refereed)
    Abstract [en]

    The aim of this study was to investigate the possibility of using the flexographic printing process for the deposition of multilayered latex-based barrier dispersion coatings on linerboard to improve its moisture barrier properties. A coating formulation developed for a conventional coater has been tested using a flexographic printing web press. The performance of multi-layering of up to six layers was compared with a single step conventional coating process in terms of runnability and barrier performance. A commercial linerboard was used as substrate for both processes. The coated linerboard samples were examined using scanning electron microscopy and surface profiling, and were characterized with respect to their coating grammage, WVTR and water absorption (Cobb(120)) properties. The impact of waxes on water absorption was also investigated for the two coating strategies. The results show that for a similar total coating grammage ( about 6 g m(-2)), samples coated using the flexographic press showed better barrier performance and less cracks on the coated surfaces than samples coated using a conventional coating process.

  • 49.
    Mesic, Behudin
    et al.
    Scion Res, Wood & Biofiber Technol, Rotorua, New Zealand..
    Kugge, Christian
    SCA R&D Ctr, Sundsvall, Sweden..
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Superhydrophobic paper coating containing nonconventional clay2010In: TAPPI Journal, ISSN 0734-1415, Vol. 9, no 11, 33-40 p.Article in journal (Refereed)
    Abstract [en]

    Hydrophobic clay fillers have not been widely used in dispersion coatings for linerboard because of the difficulty of dispersing them in water. This work investigated whether hydrophobic clay can be used as filler in barrier dispersion coatings. Hydrophobic clay was compared with conventional clay in terms of coating consolidation, structure, wetting, and barrier performance. All coatings were applied to linerboard sheets made using a laboratory dynamic sheet former. The coated linerboards were examined using scanning electron microscopy and Raman spectroscopy, and were characterized with respect to water absorption, vapor transmission rate, and contact angles. The results show that a coating containing hydrophobic clay provides a superhydrophobic character to paper; i.e., a high water contact angle (150 degrees) and relatively low water absorption. Raman mapping of cross-sections revealed that the latex distribution is uniform in the presence of either conventional clay or hydrophobic clay, and that the distribution of hydrophobic clay tends to be more uniform than conventional clay, which might reflect good mixing and consolidation of hydrophobic clay.

  • 50.
    Montibon, Elson
    et al.
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences, Paper Surface Centre.
    Lestelius, Magnus
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences, Paper Surface Centre.
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Paper Surface Centre.
    Modification of Paper into Electroconductive Material by Deposition of Conducting Polymer Blends2010Conference paper (Refereed)
12 1 - 50 of 63
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