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  • 1.
    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, p. 6-8Article in journal (Other academic)
  • 2. Johnson, Johanna
    Aspects of Flexographic Print Quality and Relationship to some Printing Parameters2008Doctoral thesis, monograph (Other academic)
  • 3.
    Johnson, Johanna
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Aspects of Flexographic Print Quality and Relationship to some Printing Parameters2008Doctoral thesis, comprehensive summary (Other scientific)
    Abstract [en]

    Flexographic printing is a common printing method in the packaging field. The printing method is characterized primarily by the flexible printing plate and the low viscosity inks which make it suitable for use on almost any substrate. The object of this study was to obtain further knowledge of the some important mechanisms of flexographic printing and how they influence the print quality. The thesis deals with printing primarily on board and liner but also on newsprint with water-borne ink using a full-scale flexographic central impression (CI) printing press. Several printing trials have been performed with a focus on the chemical interaction between the ink and substrate and the physical contact between the ink-covered printing plate and the substrate.

    Multicolour printing exposes the substrate to water from the water-containing ink. The emphasis was to investigate the relation between print quality and water-uptake of the paper surface with heat and water. Printing trials was carried out on substrates possessing a hydrophobic, and also a rather hydrophilic surface using a regular commercial water-borne ink. The favorable effect which water or surfactant solution had on the hydrophobic substrate with regard to print mottle could depend on its surface compressibility in combination with the hydrophobic nature of its surface that could affect the wetting properties.

    Conventional printing involves physical contact between plate and ink and between ink and substrate. A method for measuring the dynamic nip pressure using thin load cells is presented. Print quality was influenced by the plate material. A correction procedure taking into account the size of the sensor was developed in order to estimate the maximum dynamic pressure in the printing nip. An attempt was made to identify essential mechanical and chemical parameters, and also geometrical properties of the plate that affected print quality. Laboratory printing trials were carried out and a multivariate analysis was applied for evaluation of print quality data. The impact of the plate properties on print quality was evident. The essential properties of the plate that influence print quality were the small-scale roughness and long-scale roughness.

  • 4. Johnson, Johanna
    The Influence of Moisture, Temperature, Pressure Pulse and Substrate on Print Quality in Flexographic Printing2003Licentiate thesis, monograph (Other academic)
    Abstract [en]

    Flexographic printing is a common printing method for package printing. It is primarily the flexible printing plate and the low viscosity inks that characterizes flexographic printing, and make it possible to print on a variety of substrates. One drawback of flexographic printing has been limited print quality. However, substantial progress has been made in print quality and flexography is now competing with offset printing in certain fields.



    The objectives of this study was to obtain further knowledge of the most important mechanisms of flexographic printing and how they influence the print quality. Several printing trials were performed with water-borne inks in a full-scale flexographic central impression printing press. The results of the printing trials have been evaluated in terms of chemical interactions between the ink and the substrate and in terms of contact mechanics of the ink transfer in the nip between the ink-covered printing plate and the substrate. Uncoated board and liner were used in the printing trials.The effects of different printing press parameters on print quality have been studied: uptake of water by the substrate originating from the water-borne ink, surface temperature on the running paper web, printing pressure, printing speed and printing plate material.

  • 5.
    Johnson, Johanna
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Andersson, Caisa
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Lestelius, Magnus
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Rättö, Peter
    STFI-Packforsk AB, Stockholm, Sweden.
    Blohm, Erik
    STFI-Packforsk AB, Stockholm, Sweden.
    Some properties of Flexographic Printing Plates and Aspects on Print Quality2009In: Appita journal, ISSN 1038-6807, Vol. 62, no 5, p. 371-378Article in journal (Other academic)
  • 6. Johnson, Johanna
    et al.
    Järnström, Lars
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Materials Science.
    Växelverkan mellan ytspänningsmodifierat vatten och tryckfärg på kartongmaterial i flexotryck: Effekter på tryckkvalitativa parametrar2002Conference paper (Other (popular science, discussion, etc.))
  • 7.
    Johnson, Johanna
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Lestelius, Magnus
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    Blohm, Erik
    STFI-Packforsk, Stockholm, Sweden.
    Rättö, Peter
    STFI-Packforsk, Stockholm, Sweden.
    Järnström, Lars
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
    The Interaction between Water and Liner and Newsprint in a Flexographic CI-Printing Press2008In: TAGA Conference, San Francisco, US, 2008Conference paper (Other academic)
  • 8. Johnson, Johanna
    et al.
    Lestelius, Magnus
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Rättö, Peter
    Blohm, E.
    Järnström, Lars
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Materials Science.
    Interaction between water and paperboard and liner in a flexographic printing press2002Conference paper (Refereed)
  • 9. 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), Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Järnström, Lars
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Materials Science.
    Interaction Between Water and Paperboard and Liner in a Flexographic Printing Press2003In: Journal of Graphic Technology,vol.1(2),7-17(2003)Article in journal (Refereed)
  • 10. 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.))
  • 11. Johnson, Johanna
    et al.
    Rättö, Peter
    Lestelius, Magnus
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Blohm, E.
    Measuring the Dynamic Nip Pressure in a Flexographic CI-Printing Press2004In: Nordic Pulp and Paper Journal, vol.19,2004,pp 84-88Article in journal (Refereed)
    Abstract [en]

    The dynamic pressure in a flexographic printing press was measured and the influence of impression, speed and choice of printing plate on the dynamic pressure was analysed. The measurements were complemented by measurements to assess the ink transfer to the substrate

  • 12. Johnson, Johanna
    et al.
    Rättö, Peter
    Lestelius, Magnus
    Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Health, Science and Technology (starting 2013), Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Materials Science.
    Järnström, Lars
    Karlstad University, Faculty of Health, Science and Technology (starting 2013), Paper Surface Centre. Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering. Karlstad University, Faculty of Technology and Science, Materials Science.
    Dynamic Nip Pressure in a Flexographic CI-Printing Press2003Conference paper (Refereed)
  • 13.
    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, p. 1636-1646Article in journal (Refereed)
1 - 13 of 13
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