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  • 1.
    Beghello, Luciano
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Paper Surface Centre.
    A New Generation of Durable Banknote Paper1999Conference paper (Other (popular science, discussion, etc.))
  • 2.
    Boudreau, Jonna
    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.
    A Method of Measuring the Thickness of the Coating on a Dryer Cylinder2009In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 24, no 3, p. 309-312Article in journal (Refereed)
  • 3.
    Boudreau, Jonna
    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.
    Experiments to Find Online Measurements of the Structure of the Tissue Paper SurfaceManuscript (Other (popular science, discussion, etc.))
  • 4.
    Boudreau, Jonna
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Hollmark, Holger
    Hollmark Imptec AB.
    Beghello, Luciano
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Chemical and Morphological Analyses of the Tissue Yankee Coating2009In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 24, no 1, p. 52-59Article in journal (Refereed)
  • 5.
    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

  • 6.
    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)
  • 7.
    Karlsson, Hanna
    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 Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences (from 2013), Paper Surface Centre.
    Nilsson, Lars
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences (from 2013).
    Stolpe, Lennart
    Karlstad University, Faculty of Technology and Science.
    Abaca as a reinforcement fibre for softwood pulp2007In: TAPPI Journal, ISSN 0734-1415, Vol. 6, no 10, p. 25-32Article in journal (Refereed)
  • 8.
    Karlsson, Hanna
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Nilsson, Lars
    Karlstad University, Faculty of Technology and Science, Department of Energy, Environmental and Building Technology.
    Beghello, Luciano
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Stolpe, Lennart
    Karlstad University, Faculty of Technology and Science.
    Handsheet former for the production of stratified sheets2009In: Appita journal, ISSN 1038-6807, Vol. 62, no 4, p. 272-278Article in journal (Refereed)
  • 9. Karlsson, Hanna
    et al.
    Stolpe, Lennart
    Beghello, Luciano
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Paper Surface Centre.
    Comparison of strength properties in stratified and mixed paper2008Conference paper (Other (popular science, discussion, etc.))
    Abstract [en]

    Research has been undertaken with the aim of displacing the tensile-tear relationship towards higher strength values. Three commercial pulps were refined in an Escher-Wyss conical refiner. A softwood sulphate pulp was refined to three different levels of dewatering resistance, while a southern pine pulp and an abaca pulp were refined separately to a dewatering resistance of 17SR. The amount of fines in these two pulps was reduced by fractionation on a bow screen. Two-layer laboratory sheet were produced in a multilayer handsheet former and compared with single-layer sheets made from an homogeneous mixture of the two pulps, either softwood plus southern pine or softwood plus abaca. Analysis revealed that when increasing the degree of refining for the softwood pulp, the tensile index for the stratified sheets was increased and reached a constant level at 27.5 SR. For the mixed sheets, the tensile index increased further with increased refining. While the tear index remained at a fairly constant level for the stratified sheets, it decreased for the mixed sheets with increased degree of refining. No effect of the stratification was observed for the sheets consisting of softwood and southern pine. It has been shown that by placing a reinforcement pulp of considerably higher tearing resistance potential than the bulk pulp in a separate layer instead of homogeneously mixing the pulps, the tensile index of the sheet can be increased by increased refining of the bulk pulp with maintained tear index

  • 10.
    Karlsson, Hanna
    et al.
    Karlstad University, Faculty of Technology and Science.
    Stolpe, Lennart
    Karlstad University, Faculty of Technology and Science.
    Beghello, Luciano
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Nilsson, Lars
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences (from 2013).
    Paper strength of both stratified and homogeneous sheets with selected fibres: Part II: Effect of refining.2010Manuscript (preprint) (Other academic)
    Abstract [en]

    The effect on the tensile strength and tearing resistance of refining one of the pulps in mixed and stratified sheets composed of two pulps was examined. The aim was to see whether the stratification has a positive effect on the tensile-tear relationship, or whether the same effect can be reached by adjusting the degree of refining of the pulps. Moderately refined, fractionated abaca (Musa textilis) pulp with a high tearing resistance potential was added to a Swedish softwood sulfate pulp. The softwood pulp was refined to three different dewatering resistances. It was shown that by stratifying the sheets consisting of 50wt% abaca and 50wt% softwood, the tensile index can be increased by refining the softwood pulp while the tearing resistance is retained. The effect of stratification on the tensile-tear relationship thus differs from the effect of refining. However, for sheets composed of 17wt% abaca and 83wt% softwood, no effect of the stratification was observed. The effect of stratification with different amounts of abaca was also examined. In general, the tensile and tear indices of mixed as well as stratified sheets were close to the results predicted by linear mass fraction additivity. However the stratified sheets showed a slightly lower tensile index than predicted and the mixed sheets a slightly higher tensile index.

  • 11.
    Karlsson, Hanna
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Stolpe, Lennart
    Karlstad University, Faculty of Technology and Science.
    Beghello, Luciano
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Nilsson, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Paper strength of both stratified and homogeneous sheets with selected fibres: Part I: Effect of fibre properties.2010Manuscript (preprint) (Other academic)
    Abstract [en]

    The effect on paper strength of placing different types of fibres in separate layers instead of homogeneously mixing the fibres was examined. The aim was to displace the tensile‑tear relationship towards higher strength values. Two‑layer laboratory sheets were made in a multilayer handsheet former and compared to single‑layer sheets made from a homogeneous mixture of the two pulps. Fibres with high coarseness (southern pine) and fibres with a high fibre length (abaca, Musa textilis) were added to a Swedish softwood sulfate pulp. Placing the different fibres in separate layers was shown to give a higher tearing resistance but a lower tensile strength than mixing the fibres. The sheets containing southern pine showed results as expected, based on linear mass fraction additivity and the differences in density between the sheets, whereas the sheets containing abaca indicated a synergism for tensile strength in the mixed sheets. The results are discussed with respect to differences in load distribution in the sheets during the tensile and tear tests. It is suggested that the high tear index of the stratified sheets is because the degree of bonding is at a low level in the southern pine and abaca layers, while the high tensile index of the stratified sheets is a result of an increased activation of the additive fibres in the network together with the more flexible softwood fibres. Fibre length seems to be more important than fibre coarseness for achieving a positive effect on paper strength of stratification.

  • 12.
    Karlsson, Hanna
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Stolpe, Lennart
    Karlstad University, Faculty of Technology and Science.
    Beghello, Luciano
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Nilsson, Lars
    Karlstad University, Faculty of Technology and Science, Department of Energy, Environmental and Building Technology.
    The effect on paper strength of man-made fibres added to a softwood kraft pulpManuscript (preprint) (Other academic)
  • 13.
    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.))
  • 14.
    Land, Cecilia
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Stolpe, Lennart
    Karlstad University, Faculty of Technology and Science.
    Beghello, Luciano
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Modeling of bagginess due to storage of paper reels with ridges2009In: TAPPI Journal, ISSN 0734-1415, Vol. 8, no 9, p. 18-22Article in journal (Refereed)
    Abstract [en]

    Paper is subjected to stress relaxation during storage in reels. Ridges in the paper reel subject the paper in the ridge to a higher strain than the paper adjacent to the ridge. The strain difference can become a permanent strain difference, resulting in a baggy web after unwinding. Researchers used a geometrical model based on stress relaxation test results to determine when the bagginess is substantial enough to cause problems. The results showed that runnability problems will appear if the ridge is about 1–2 mm high. This applies for a reel with a diameter of 1.2–1.8 m stored for 1 week.

  • 15.
    Land, Cecilia
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Stolpe, Lennart
    Karlstad University, Faculty of Technology and Science.
    Wahlström, Torbjörn
    Stora Enso, Karlstad, Sweden.
    Beghello, Luciano
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    MD strain and bagginess due to calendering2011In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 26, no 1, p. 106-117Article in journal (Refereed)
  • 16.
    Land, Cecilia
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Wahlström, Torbjörn
    Stora Enso, Karlstad, Sweden.
    Stolpe, Lennart
    Beghello, Luciano
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Plastic strain of moisture streaks at different moisture contents2010In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 25, no 4, p. 481-487Article in journal (Refereed)
    Abstract [en]

    An uneven moisture profile in the paper web during drying can cause runnability problems due to slack areas in the paper web. This study aims at indentifying the moisture level at which it is most important to keep the moisture even. This was evaluated with a laboratory study of plastic strain after loading wet paper samples to strains between 0.3-4% and unloading. The papers tested were made from softwood bleached kraft pulp and the moisture content varied between 9 and 50%. The plastic strain was highest at a moisture content of 20-30%, but the sensitivity to moisture variations was highest at a moisture content of 10-20%. The paper was also sensitive to moisture variations above a moisture content of 30%.

    According to calculations based on the laboratory results, moist streaks appearing at a high moisture content would turn into short streaks, and moist streaks appearing at a low moisture content would turn into long streaks. A machine trial with moist streaks applied at high moisture resulted in short streaks in the paper, confirming the qualitative results of the laboratory study.

  • 17.
    Land, Cecilia
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Widstrand, Jonny
    Stora Enso, Karlstad, Sweden.
    Wahlström, Tommy
    Stolpe, Lennart
    Karlstad University, Faculty of Technology and Science.
    Beghello, Luciano
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Bagginess due to storage of paper reels with artificially fabricated ridgesManuscript (preprint) (Other academic)
1 - 17 of 17
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