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Some properties of Flexographic Printing Plates and Aspects on Print Quality
Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.
Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.ORCID iD: 0000-0001-7368-7227
Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.ORCID iD: 0000-0002-0674-4356
Karlstad University, Faculty of Technology and Science, Department of Chemical Engineering.ORCID iD: 0000-0002-1256-1708
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2009 (English)In: Appita journal, ISSN 1038-6807, Vol. 62, no 5, 371-378 p.Article in journal (Other academic) Published
Place, publisher, year, edition, pages
Appita , 2009. Vol. 62, no 5, 371-378 p.
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-2064OAI: oai:DiVA.org:kau-2064DiVA: diva2:5783
Available from: 2008-08-25 Created: 2008-08-25 Last updated: 2015-10-22Bibliographically approved
In thesis
1. Aspects of Flexographic Print Quality and Relationship to some Printing Parameters
Open this publication in new window or tab >>Aspects of Flexographic Print Quality and Relationship to some Printing Parameters
2008 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Flexographic printing is a common printing method in the packaging field. The printing method is characterized primarily by the flexible printing plate and the low viscosity inks which make it suitable for use on almost any substrate. The object of this study was to obtain further knowledge of the some important mechanisms of flexographic printing and how they influence the print quality. The thesis deals with printing primarily on board and liner but also on newsprint with water-borne ink using a full-scale flexographic central impression (CI) printing press. Several printing trials have been performed with a focus on the chemical interaction between the ink and substrate and the physical contact between the ink-covered printing plate and the substrate.

Multicolour printing exposes the substrate to water from the water-containing ink. The emphasis was to investigate the relation between print quality and water-uptake of the paper surface with heat and water. Printing trials was carried out on substrates possessing a hydrophobic, and also a rather hydrophilic surface using a regular commercial water-borne ink. The favorable effect which water or surfactant solution had on the hydrophobic substrate with regard to print mottle could depend on its surface compressibility in combination with the hydrophobic nature of its surface that could affect the wetting properties.

Conventional printing involves physical contact between plate and ink and between ink and substrate. A method for measuring the dynamic nip pressure using thin load cells is presented. Print quality was influenced by the plate material. A correction procedure taking into account the size of the sensor was developed in order to estimate the maximum dynamic pressure in the printing nip. An attempt was made to identify essential mechanical and chemical parameters, and also geometrical properties of the plate that affected print quality. Laboratory printing trials were carried out and a multivariate analysis was applied for evaluation of print quality data. The impact of the plate properties on print quality was evident. The essential properties of the plate that influence print quality were the small-scale roughness and long-scale roughness.

Place, publisher, year, edition, pages
Karlstad: Karlstad University, 2008. 99 p.
Series
Karlstad University Studies, ISSN 1403-8099 ; 2008:28
Keyword
Flexography, Print Quality, Liner, Board, Newsprint, Water-borne ink, Dynamic Pressure, Plate Properties, Wetting
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-1793 (URN)978-91-7063-187-0 (ISBN)
Public defence
2008-09-12, Ericssonsalen 9C204, Karlstads univeristet, Karlstad, 10:15
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Supervisors
Available from: 2008-08-25 Created: 2008-08-25 Last updated: 2011-11-28

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Johnson, JohannaAndersson, CaisaLestelius, MagnusJärnström, Lars

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