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Simultaneous determination of absorption mottle and white-top mottle in the same area on coated boards
Innventia AB, Stockholm.
Innventia AB, Stockholm .
Innventia AB, Stockholm.
2013 (English)In: Proceedings of the 40th International Research Conference of iarigai / [ed] Enlund, N. & Lovreček, M., Darmstadt, Germany: International Association of Research Organizations for the Information, Media and Graphic Arts Industrie (IARIGAI), 2013, 225-232 p.Conference paper (Other academic)
Abstract [en]

The proposed measurement technique offers a number of advantages compared to other absorption methods. It enables one to study liquid absorption in a time period that is relevant to printing. Moreover, with this technique one can quantify the contributions of white-top mottle and absorption mottle at the same location and in great detail. This makes this technique a useful tool for quality control of paper board products and for predicting print mottle of flexographic printing. The reproducibility and reliability of the technique were very promising, as suggested by the Round Robin tests.

Place, publisher, year, edition, pages
Darmstadt, Germany: International Association of Research Organizations for the Information, Media and Graphic Arts Industrie (IARIGAI), 2013. 225-232 p.
Series
, Advances in Printing and Media Technology, ISSN 2225-6067 ; Vol. XL
Keyword [en]
absorption non-uniformity, absorption mottle, white-top mottle, liquid absorption, flexography
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-34908ISBN: 978-3-9812704-4-0OAI: oai:DiVA.org:kau-34908DiVA: diva2:780745
Conference
40th International Research Conference of iarigai, Chemnitz, Germany, September 2013
Available from: 2015-01-15 Created: 2015-01-15 Last updated: 2015-02-12Bibliographically approved
In thesis
1. Absorption non-uniformity characterisation and its impact on flexographic ink distribution of coated packaging boards
Open this publication in new window or tab >>Absorption non-uniformity characterisation and its impact on flexographic ink distribution of coated packaging boards
2015 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

There are high demands on flexographic print quality to be sufficiently high and consistent in order to create a competitive packaging. At the same time the production efficiency need to be high. Printers thus need to achieve the same quality every time and quickly start-up new printing jobs. To accomplish this, one needs to gain a thorough understanding of how the liquid packaging board interacts with the ink and impacts the print quality.

This thesis focuses on water-based ink absorption of liquid packaging boards and particularly on a) how uniformity of ink absorption can be measured and b) to what extent the absorption characteristics contribute to print mottle in flexographic printing.

The work encompasses two parts. First, an absorption non-uniformity test method has been developed using a staining technique. This method is unique as it measures how unevenly an aqueous solution is absorbed, in a short time period and without impact from surface roughness. Moreover, the contributions from white-top mottle and absorption non-uniformity can be quantified simultaneously from one single measurement.

Second, a method to independently study the effects of absorption non-uniformity on print quality has been established. This is achieved by introducing artificial absorption non-uniformities with well-controlled barrier patterns. A barrier pattern may modify local pore structure and/or surface energy, hence lead to lateral absorption variations. By these means, it is possible to produce a substrate property-matrix; encompassing absorption non-uniformity and for example surface roughness. It was demonstrated that non-uniform absorption indeed has a negative impact on print quality, both on smoother and rougher boards. Low absorption made print density decrease and uneven absorption caused print mottle. This was the case when other properties of the samples were kept within a narrow range; otherwise surface roughness appeared to determine print mottle ranking.

Place, publisher, year, edition, pages
Karlstad: Karlstads universitet, 2015. 70 p.
Series
Karlstad University Studies, ISSN 1403-8099 ; 2015:7
Keyword
Liquid absorption, Absorption non-uniformity, Characterisation, Measurement technique, Print Mottle, Flexography, Coated packaging boards
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-34910 (URN)978-91-7063-618-9 (ISBN)
Presentation
2015-03-05, Nyqvistsalen, Karlstads universitet, Karlstad, 10:00 (English)
Opponent
Supervisors
Available from: 2015-02-12 Created: 2015-01-15 Last updated: 2015-02-12Bibliographically approved

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