miun.sePublications
Change search
Refine search result
1 - 6 of 6
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • 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.
  • 1.
    Lundberg, Anna
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Ink-paper interactions and effect on print quality in inkjet printing2011Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis concerns paper and ink interactions related to inkjet printing. The

    main purpose of this work was to gain a deeper understanding in which

    parameters control the flow of ink into papers and how the ink interacts with the

    paper surface. The overall objective was to find key parameters to optimize the

    print quality in inkjet printing. Characterization of paper-surfaces in terms of porosity, surface roughness and

    surface energy was made. Objective and subjective measurements were used for

    print quality evaluation. Light microscopy imaging and SEM was used to see how

    ink interacts with the paper surface in a printed image. A high speed camera was

    used to study the absorption of picolitre sized inkjet droplets into fine papers.

    An initial study on the effect of paper properties on print quality was made.

    Result indicated that there were small differences in print quality for pilot papers

    with different composition (in a specific parameter window) and the commercial

    paper COLORLOK® reproduced a noticeable high colour gamut compared to the

    other samples.Research was made to see how surface fixation can affect the print quality for

    printouts made with pigmented ink. Surface fixation promotes retention of the

    pigmented colorant in the outermost surface layer of the paper and has been

    denoted “colorant fixation” in this thesis.

    It was shown that applying colorant fixation onto a paper surface before

    printing can increase the detail reproduction in a printed image. Different

    concentrations of calcium chloride were applied onto the paper surface on fullscale

    produced non-commercial papers. Test printing was made with a SoHo

    (Small office/Home office) printer using pigmented ink and results showed that

    using calcium chloride as surface treatment can lead to aggregation of pigments at

    the surface resulting in a higher detail reproduction.

    Fast absorption of the carrier liquid into the paper and fast fixation of

    colourants on the surface is important in inkjet printing to avoid colour to colour

    bleeding. These demands will be more pronounced when the printing speed

    increases. It is important to understand which parameters affect the absorption process to

    be able to control the mechanisms and to optimize the print quality.

    A study of absorption of picolitre size inkjet droplets into fine paper was made

    in this work. Theoretical equations describing fluid absorption into capillaries were

    tested and compared with experimental results. The result showed that the time

    dependence in the Lucas-Washburn (L-W) equation fits fairly well to data whereas

    the L-W equation overestimates the penetration depth.

    The results are directly applicable to paper and printing industry and can be

    used as a base for future studies of absorption of picolitre sized droplets into

    porous materials and for studies of aggregation of colloidal particles on surfaces.

  • 2.
    Lundberg, Anna
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Örtegren, Jonas
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Alfthan, Elisabeth
    On the Effect of Variations in paper composition on print quality2009In: International Conference on Digital Printing Technologies 2009, The Society for Imaging Science and Technology, 2009, p. 316-319Conference paper (Refereed)
    Abstract [en]

    During the last few years, digital printing technology has begun to play a significant role in the printing industry due to the quest for short runs and variable data printing. Digital printing using inkjet technology makes heavy demands on the paper's ability to rapidly absorb liquid and thereby increases the need to understand what parameters that affect the dynamics and interactions between paper and ink and how print quality is affected by these parameters. In this paper, the print quality for nine pilot papers with varying composition and eight different commercial papers has been studied. The printouts have been made with two small office/Home office printers; the print quality measurements for this study have been line quality-measurements and color -gamut volume measurements. The line quality and the color gamut volume for the commercial papers and the pilot papers are discussed.

     

     

  • 3.
    Lundberg, Anna
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Örtegren, Jonas
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Alfthan, Elisabeth
    Kommendörsgatan 44, SE-114 58 Stockholm.
    Ström, Göran
    Innventia, SE-11486 Stockholm, Sweden.
    Microscale droplet absorption into paper for inkjet printing2011In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 26, no 1, p. 142-150Article in journal (Refereed)
    Abstract [en]

    Digital printing using high-speed inkjet technology puts heavy demands on paper's ability to rapidly absorb the liquid. This is important for both the runability during the printing process and for the print quality. In this article, the dynamics of inkjet droplet absorption and penetration is discussed. The LucasWashburn equation has been applied to experimental results from inkjet printing on paper. The ink absorption on different paper grades is discussed in terms of the physical properties of the surface such as surface energy, surface roughness and porosity. The results of this study indicate that ASA used as internal sizing reduces the absorption speed of water based dye inkjet ink and that evaporation affects the result. The Lucas-Washburn equation can be used to some extent for describing micro-scale droplet absorption into paper, depending on the properties of the paper.

  • 4.
    Lundberg, Anna
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Örtegren, Jonas
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Norberg, Ole
    Voxvil AB, 892 43 Domsjö, Sweden .
    Aggregation of Color pigments by Surface fixation treatment2011In: Journal of Imaging Science and Technology, ISSN 1062-3701, E-ISSN 1943-3522, Vol. 55, no 5, p. 1-8Article in journal (Refereed)
    Abstract [en]

    The quality of a printed image is strongly influenced by the physical and the chemical interactions between the ink and the paper. Print quality can be evaluated either by objective measurements using instruments or by visual assessment studies involving panel of observers judging the final print. In this article, the print quality on commercial papers as well as on non-commercial papers with different amounts of salt for surface fixation has been studied. Perceived detail reproduction depends not only on sharp edge definition but also on the level of color saturation (Chroma). Color saturation and edge definition originate from two different ink and paper interaction processes. Color saturation is heavily dependent on ink penetration while edge definition correlates to ink spreading. In order to gain understanding of the performance of surface treatment by salt, large efforts have been put on splitting up of the increase in color saturation (Chroma) and improved edge definition. The printouts have been made with a desktop printer using pigmented inks. Cross section images have been taken with a light microscope to analyze the ink penetration depth. SEM analysis has been made to analyze the aggregation of the pigments on the surface. The print quality measurements have been both objective measurements such as print density and subjective image evaluation using a test panel of observers in a perceptual study. The perceptual study focused on detail reproduction, and efforts were made to separate the influence of the print density from the edge definition on the detail reproduction. The result from this study shows that an increased level of salt as surface fixation improves the detail reproduction due to aggregation of the pigments on the surface and that the ink penetration depth can be reduced by adding salt as surface fixation resulting in a higher print density.

  • 5.
    Lundberg, Anna
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Örtegren, Jonas
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Norberg, Ole
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Wågberg, K
    Improved Print quality by Surface fixation of Pigments2010In: International Conference on Digital Printing Technologies, The Society for Imaging Science and Technology, 2010, , p. 5p. 251-255Conference paper (Refereed)
    Abstract [en]

    Inkjet printing is a non impact printing method that deposits a limited amount of ink onto the paper surface. To improve runnabillity and printability the demands on papers ability to rapidly absorb the fluid and make the colorants stay on the surface increase. These demands get more pronounced as the technology develops and the print speed significantly increases.

    The quality of a printed image is strongly influenced by the physical and the chemical interactions between the ink and the paper. Some print quality parameters can be measured objectively by physical measurements using instruments. Subjective print quality evaluation involves human judgments of the final print.

    In this article, the print quality on commercial papers as well as on trial papers with different amounts of salt for surface fixation has been studied. The printouts have been made with a desktop printer that uses pigmented inks. The print quality measurements have been both objective measurements such as print density and line quality and subjective image evaluation using a test panel in a perceptual study. The perceptual study focused on detail reproduction, and efforts were made to separate the influence of the print density from the edge definition on the detail reproduction. The study confirms the influence of ink and paper interaction on print quality and the relation to different levels of surface fixation.

  • 6.
    Örtegren, Jonas
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Lundberg, Anna
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences.
    Ink -Media Interaction: Aggregation Of Color Pigments By Salt With Different Valency And Impact On Print Quality2014In: International Conference on Digital Printing Technologies, The Society for Imaging Science and Technology, 2014, p. 437-439Conference paper (Refereed)
    Abstract [en]

    We previously reported on the effect of surface properties on inkjet print quality and print functionality. Printing can furthermore be used to effectively functionalize paper surfaces or to modify surface properties of paper for subsequent inkjet printing. Migration of molecules and particles from the paper surface may cause destabilization of the pigment dispersion and result in aggregation of pigments, as shown previously for different concentrations of calcium chloride at the surface of uncoated paper. In this work, utilizing standardized methods such as inkjet printing, ink draw down and print density measurements, it is shown that surface functionalisation using di- and trivalent salts may effectively destabilize a pigment dispersion, causing aggregation of pigments which in turn has a major impact on the print quality.

1 - 6 of 6
CiteExportLink to result list
Permanent link
Cite
Citation style
  • apa
  • 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