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Aggregation of Color pigments by Surface fixation treatment
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media. (DPC)
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media. (DPC)
Voxvil AB, 892 43 Domsjö, Sweden . (DPC)
2011 (English)In: Journal of Imaging Science and Technology, ISSN 1062-3701, Vol. 55, no 5, 1-8 p.Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
2011. Vol. 55, no 5, 1-8 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:miun:diva-13320DOI: 10.2352/J.ImagingSci.Technol.2011.55.5.050605ISI: 000298271100009ScopusID: 2-s2.0-84867193194OAI: oai:DiVA.org:miun-13320DiVA: diva2:400786
Projects
Next generation substrates for inkjet printing
Available from: 2011-03-04 Created: 2011-02-28 Last updated: 2015-03-19Bibliographically approved
In thesis
1. Ink-paper interactions and effect on print quality in inkjet printing
Open this publication in new window or tab >>Ink-paper interactions and effect on print quality in inkjet printing
2011 (English)Licentiate 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.

Place, publisher, year, edition, pages
Sundsvall: Kopieringen Mittuniversitetet, 2011. 28 p.
Series
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 57
National Category
Other Physics Topics
Identifiers
urn:nbn:se:miun:diva-13373 (URN)978-91-86694-23-4 (ISBN)
Presentation
Skeppet Arkenbyggnaden, Järnvägsgatan 3, Örnsköldsvik (English)
Opponent
Projects
Next generation substrates for inkjet printing
Note
Presentationen hölls den 2011-02-25Available from: 2011-03-18 Created: 2011-03-15 Last updated: 2012-07-31Bibliographically approved

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Lundberg, AnnaÖrtegren, JonasNorberg, Ole
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