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Printability and Ink-Coating Interactions in Inkjet Printing
Karlstad University, Faculty of Technology and Science.
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Inkjet is a digital printing process where the ink is ejected directly onto a substrate from a jet device driven by an electronic signal. Most inkjet inks have a low viscosity and a low surface tension, which put high demands on the coating layer’s porosity and absorbency characteristics.

The aim of this study has been to gain an increased knowledge of the mechanisms that control the sorption and fixation of inkjet inks on coated papers. The focus has been on printability aspects of high print quality (although not photographic quality) laboratory-coated inkjet papers for printers using aqueous-based inks.

Papers coated solely with polyvinyl alcohol (PVOH) and starch presented excellent gamut values and good print sharpness over the uncoated substrate, due to good film-forming characteristics observed by light microscopy and ESCA. ESEM analyses showed the complexity and variation of PVOH surface structures, which has probably explained the wide scatter in the colour-to-colour bleed results. Pure PVOH coatings also gave a surface with high gloss variations (2-8 times greater than that of commercial inkjet papers), prolonged ink drying time, and cracked prints when using pigmented inks. When an amorphous silica gel pigment (with broad pore size distribution) was used in combination with binder, a new structure was formed with large pores in and between the pigments and a macro-roughness generated by the large particles. The inkjet ink droplets could quickly penetrate into the large pores and the time for surface wicking was reduced, which was beneficial for the blurriness. However, the macro-roughness promoted bulk spreading in the coarse surface structure, and this tended to increase the line width. Finally, when the ink ends up within the coating, the colorant is partly shielded by the particles, and this reduced the gamut area to some extent. The binder demand of the silica pigments was strongly related to their pore size distributions. Silica gel required two to three times the amount of binder compared to novel surfactant-templated mesoporous silica pigments (with small pores and narrow pore size distribution). This finding was attributed to the significant penetration of PVOH binder into the pores in the silica gel, thereby, increasing its binder demand. Furthermore, this binder penetration reduced the effective internal pore volume available for rapid drainage of the ink vehicle. Consequently, the surfactant-templated pigments required significantly lower amounts of binder, and gave improvements in print quality relative to the commercial pigment.

Place, publisher, year, edition, pages
Fakulteten för teknik- och naturvetenskap , 2007.
Series
Karlstad University Studies, ISSN 1403-8099 ; 2007:2
Keywords [en]
coating, inkjet, print quality, printability, pigment, silica, polyvinyl alcohol, colorant, ink absorption
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-572ISBN: 91-7063-104-2 (print)OAI: oai:DiVA.org:kau-572DiVA, id: diva2:6256
Public defence
2007-02-07, Nyqvistsalen, 9C 203, Karlstads Universitet, Karlstad, 10:15
Opponent
Supervisors
Available from: 2007-01-30 Created: 2007-01-30
List of papers
1. Inkjet Print Quality Measurements: Correlation Between Instrumental and Perceptual Assessments
Open this publication in new window or tab >>Inkjet Print Quality Measurements: Correlation Between Instrumental and Perceptual Assessments
(English)Manuscript (Other academic)
Identifiers
urn:nbn:se:kau:diva-2076 (URN)
Available from: 2007-01-30 Created: 2007-01-30 Last updated: 2010-05-17Bibliographically approved
2. Influence of Polyvinyl Alcohol on Inkjet Printability
Open this publication in new window or tab >>Influence of Polyvinyl Alcohol on Inkjet Printability
2004 (English)In: 2004 TAPPI International Printing and Graphic Arts Conference, 2004, p. 187-198Conference paper, Published paper (Refereed)
Identifiers
urn:nbn:se:kau:diva-2077 (URN)
Available from: 2007-01-30 Created: 2007-01-30 Last updated: 2010-05-17Bibliographically approved
3. Surfactant-Templated Mesoporous Silica as a Pigment in Inkjet Paper Coatings
Open this publication in new window or tab >>Surfactant-Templated Mesoporous Silica as a Pigment in Inkjet Paper Coatings
2006 (English)In: Journal of Pulp and Paper Science (JPPS), ISSN 0826-6220, Vol. 32, no 1, p. 32-37Article in journal (Refereed) Published
Identifiers
urn:nbn:se:kau:diva-2078 (URN)
Available from: 2007-01-30 Created: 2007-01-30 Last updated: 2017-12-06Bibliographically approved
4. Colourant Migration in Mesoporous Inkjet-receptive Coatings
Open this publication in new window or tab >>Colourant Migration in Mesoporous Inkjet-receptive Coatings
2006 (English)In: 2006 TAPPI Advanced Coating Fundamentals Symposium, 2006, p. 221-228Conference paper, Published paper (Refereed)
Identifiers
urn:nbn:se:kau:diva-2079 (URN)
Available from: 2007-01-30 Created: 2007-01-30 Last updated: 2010-05-17Bibliographically approved
5. Using the Micro Drop Absorption Tester (MicroDAT) to Study Droplet Imbibition and its Effect on Inkjet Print Quality
Open this publication in new window or tab >>Using the Micro Drop Absorption Tester (MicroDAT) to Study Droplet Imbibition and its Effect on Inkjet Print Quality
(English)Manuscript (Other academic)
Identifiers
urn:nbn:se:kau:diva-2080 (URN)
Available from: 2007-01-30 Created: 2007-01-30 Last updated: 2010-05-17Bibliographically approved

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Citation style
  • apa
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