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Improved Print quality by Surface fixation of Pigments
Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationsteknologi och medier. (DPC)
Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationsteknologi och medier. (DPC)
Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för informationsteknologi och medier.
2010 (Engelska)Ingår i: International Conference on Digital Printing Technologies, The Society for Imaging Science and Technology, 2010, , s. 5s. 251-255Konferensbidrag, Publicerat paper (Refereegranskat)
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.

Ort, förlag, år, upplaga, sidor
The Society for Imaging Science and Technology, 2010. , s. 5s. 251-255
Nyckelord [en]
Print quality, Pigmented ink
Nationell ämneskategori
Datorseende och robotik (autonoma system)
Identifikatorer
URN: urn:nbn:se:miun:diva-12237Scopus ID: 2-s2.0-79955746977ISBN: 978-089208293-3 (tryckt)OAI: oai:DiVA.org:miun-12237DiVA, id: diva2:370074
Konferens
26th International Conference on Digital Printing Technologies, NIP26 and 6th International Conference on Digital Fabrication 2010, DF 2010; Austin, TX; 19 September 2010 through 23 September 2010; Code 84729
Projekt
Next generation substrates for inkjet printingTillgänglig från: 2010-11-29 Skapad: 2010-11-15 Senast uppdaterad: 2018-01-12Bibliografiskt granskad
Ingår i avhandling
1. Ink-paper interactions and effect on print quality in inkjet printing
Öppna denna publikation i ny flik eller fönster >>Ink-paper interactions and effect on print quality in inkjet printing
2011 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Sundsvall: Kopieringen Mittuniversitetet, 2011. s. 28
Serie
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 57
Nationell ämneskategori
Annan fysik
Identifikatorer
urn:nbn:se:miun:diva-13373 (URN)978-91-86694-23-4 (ISBN)
Presentation
Skeppet Arkenbyggnaden, Järnvägsgatan 3, Örnsköldsvik (Engelska)
Opponent
Projekt
Next generation substrates for inkjet printing
Anmärkning
Presentationen hölls den 2011-02-25Tillgänglig från: 2011-03-18 Skapad: 2011-03-15 Senast uppdaterad: 2012-07-31Bibliografiskt granskad

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Lundberg, AnnaÖrtegren, JonasNorberg, Ole

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