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Microscale droplet absorption into paper for inkjet printing
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media. (Digital Printing Center)
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media. (DPC)
Kommendörsgatan 44, SE-114 58 Stockholm.
Innventia, SE-11486 Stockholm, Sweden.
2011 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, Vol. 26, no 1, 142-150 p.Article in journal (Refereed) Published
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.

Place, publisher, year, edition, pages
2011. Vol. 26, no 1, 142-150 p.
Keyword [en]
Capillary absorption, Dyes, High-speed inkjet printing, Lucas-Washburn equation, Paper properties, High-speed, Ink absorption, Ink jet technology, Ink-jet droplets, Internal sizing, Micro-scales, Print qualities, Printing process, Surface energies, Water based, Capillary flow, Drops, Ink, Ink jet printers, Ink jet printing, Printing presses, Surface chemistry, Surface roughness, Water absorption, Capillarity, Chemistry, Evaporation, Porosity, Printing Machines, Roughness, Surface Properties
National Category
Other Engineering and Technologies
Identifiers
URN: urn:nbn:se:miun:diva-13321ISI: 000293770200015ScopusID: 2-s2.0-79955457976OAI: oai:DiVA.org:miun-13321DiVA: diva2:400784
Projects
Next Generation substrates for inkjet printing
Available from: 2011-03-04 Created: 2011-02-28 Last updated: 2012-11-28Bibliographically 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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