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Influence of board properties on the flexographic ink distribution in single and multicoloured prints
Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), Institutionen för ingenjörs- och kemivetenskaper (from 2013).ORCID-id: 0000-0002-0674-4356
(engelsk)Manuskript (preprint) (Annet vitenskapelig)
HSV kategori
Forskningsprogram
Kemiteknik
Identifikatorer
URN: urn:nbn:se:kau:diva-69987OAI: oai:DiVA.org:kau-69987DiVA, id: diva2:1259729
Tilgjengelig fra: 2018-10-30 Laget: 2018-10-30 Sist oppdatert: 2019-04-25bibliografisk kontrollert
Inngår i avhandling
1. Where did the ink go?: The effect of liquid absorption on ink distribution in flexography
Åpne denne publikasjonen i ny fane eller vindu >>Where did the ink go?: The effect of liquid absorption on ink distribution in flexography
2018 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The appearance of a print is affected by the individual ink layers. If the ink is unevenly distributed on the substrate it lowers the quality. This thesis puts focus on how the liquid absorbency of a coated substrate impacts on the ink distribution in flexographic printing. It is well known that a smooth surface increases the chances of a uniform print, whereas the influence from an uneven absorption is not established and has even been difficult to measure. If the ink is applied directly onto the substrate, or as an overprint onto already present ink layers, the outcome is even more complex. Ink trapping behaviour affects the uniformity of overprint layers. As of yet, this been largely overlooked in flexography.

The work includes several trials, from monochrome laboratory printing at 0.5 ms-1 to multicolour printing at 10 ms-1 in production-scale. These studies showed that ink absorption interacted directly with monochrome ink layers and that pore-structures with larger pores and greater liquid uptake generated more uniform prints. The tolerance of uneven pore-structure, and thereby absorption, varied between samples.

In multicolour printing, the overprint layer interacted directly with the preceding ink and indirectly with the absorbency (rate and uniformity) of the substrate. Overprint layers became thicker when the first ink layer was thinner and, consequently, turned uneven when the first layer was uneven. Moreover, the time between the applications of the two inks was important. When immobilisation of the first ink was too slow or uneven, it disturbed the ink trapping so that the overprint layer became uneven.

Output from this project offers a palette of tools to use when studying liquid absorption and its impact on print quality: a) experimental approach to separate the influence of uneven absorption from surface roughness, b) aqueous staining technique to characterise absorption non-uniformity, and c) technique to characterise ink trapping non-uniformity.

Abstract [en]

The appearance of a print is affected by the individual ink layers, and when the ink is unevenly distributed it will bring negative consequences. As an extension, print quality can affect how packaging is perceived and may even create ideas about the product inside the packaging. Therefore, it is important to understand the reasons behind poor and uneven print and to ensure that the board substrate provides a stable quality.

This thesis puts focus on how the absorbency of a coated substrate impacts the ink distribution in flexographic printing. Both monochrome and multicoloured areas are dealt with. To generate an understanding of these interactions, two new measurement techniques were developed where the non-uniformities in liquid absorption and ink trapping can be characterised. Surface roughness often has a strong influence on the print and this may hide interactions from ink absorbency. Therefore, the materials used here were carefully selected (or designed) to highlight the way liquid uptake affects the ink layers. Interactions between substrate and printing ink were studied in several ways, from monochrome printing at 0.5 ms-1 in laboratory-scale to multicolour printing at 10 ms-1 in production-scale.

sted, utgiver, år, opplag, sider
Karlstad: Karlstads universitet, 2018. s. 96
Serie
Karlstad University Studies, ISSN 1403-8099 ; 2018:52
Emneord
flexographic printing, print mottle, ink trapping, absorbency, absorption non-uniformity, water-interference mottle
HSV kategori
Forskningsprogram
Kemiteknik
Identifikatorer
urn:nbn:se:kau:diva-69984 (URN)978-91-7063-892-3 (ISBN)978-91-7063-987-6 (ISBN)
Disputas
2018-12-18, 21A 244, Ljungberg, Universitetsgatan 2, Karlstad, 10:15 (engelsk)
Opponent
Veileder
Forskningsfinansiär
Knowledge Foundation, Dnr 20100268
Merknad

Samarbete med RISE AB

Tilgjengelig fra: 2018-11-28 Laget: 2018-10-30 Sist oppdatert: 2018-11-28bibliografisk kontrollert

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