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Ink adhesion failure during full scale offset printing: causes and impact on print quality
Innventia AB, Sweden.
Innventia AB, Sweden.
Omya AG.
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2015 (English)In: Journal of Print and Media Technology Research, ISSN 2223-8905, Vol. 4, no 4, 257-278 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
International Association of Research Organizations for the Information, Media and Graphic Arts Industrie (IARIGAI), 2015. Vol. 4, no 4, 257-278 p.
Keyword [en]
coated paper, coating permeability, offset print quality, water induced print mottle, uncovered area, polyacrylic dispersant
National Category
Chemical Engineering
Research subject
Fibre and Polymer Science
Identifiers
URN: urn:nbn:se:kth:diva-194165OAI: oai:DiVA.org:kth-194165DiVA: diva2:1038380
Note

QC 20161019

Available from: 2016-10-18 Created: 2016-10-18 Last updated: 2016-10-19Bibliographically approved
In thesis
1. Interfacial Adhesion Failure: Impact on print-coating surface defects
Open this publication in new window or tab >>Interfacial Adhesion Failure: Impact on print-coating surface defects
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The aim of this work was to develop a solid knowledge on formulation effects controlling offset ink-paper coating adhesion and to identify key factors of the coating and printing process affecting it. Focus lay on comprehending the impact of pigment dispersant on ink-paper coating adhesion and ultimately on the print quality of offset prints.

The work covers laboratory studies, a pilot coating trial designed to produce coated material with a span in surface chemistry and structure, and an industrial offset printing trial.

The lab scale studies quantified ink-paper coating adhesion failure during ink setting with a developed laboratory procedure based on the Ink-Surface Interaction Tester (ISIT) and image analysis. Additional polyacrylate dispersant resulted in slower ink setting and reduced ink-paper coating adhesion, with a dependence on its state of salt neutralisation and cation exchange, mainly in the presence of moisture/liquid water.

The industrial printing trial on pilot coated papers was designed to study how these laboratory findings affected full scale offset print quality. These trials confirmed the dispersant-sensitive effect on ink-paper coating adhesion, especially at high water feeds. Evaluation of prints from the printing trial resulted in two fundamentally different types of ink adhesion failure being identified. The first type being traditional ink refusal, and the second type being a novel mechanism referred to as ink-lift-off adhesion failure. Ink-lift-off adhesion failure occurs when ink is initially deposited on the paper but then lifted off in a subsequent print unit. In this work, ink adhesion failure by this ink-lift-off mechanism was observed to occur more often than failure due to ink refusal.

Print quality evaluation of the industrial prints suggested that water induced mottle was caused by a combination of ink-surface adhesion failure, creating white spots on the print, together with variation in ink layer thickness due to emulsified ink.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2016. 102 p.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 2016:35
Keyword
Ink-paper coating adhesion, offset printing, calcium carbonate pigments, polyacrylate, dispersant, print mottle, surface chemistry, hygroscopy of surfaces, coating structure, print quality, water interference mottle
National Category
Chemical Engineering
Research subject
Fibre and Polymer Science
Identifiers
urn:nbn:se:kth:diva-194166 (URN)978-91-7729-136-7 (ISBN)
Public defence
2016-11-18, F3, Lindstedtsvägen 26, Stockholm, 09:00 (English)
Opponent
Supervisors
Note

QC 20161019

Available from: 2016-10-19 Created: 2016-10-18 Last updated: 2016-10-26Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
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Language
  • de-DE
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  • Other locale
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Output format
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  • asciidoc
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