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Johnson, Johanna
Publications (10 of 13) Show all publications
Johansson, C., Johnson, J. & Järnström, L. (2011). Photopolymer printing plates: Changes in performance and properties. Flexo & Gravure International, 17(1), 6-8
Open this publication in new window or tab >>Photopolymer printing plates: Changes in performance and properties
2011 (English)In: Flexo & Gravure International, Vol. 17, no 1, p. 6-8Article in journal (Other academic) Published
Place, publisher, year, edition, pages
Gutach: G&K TechMedia GmbH, 2011
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-10663 (URN)
Available from: 2012-02-08 Created: 2012-02-08 Last updated: 2015-10-21Bibliographically approved
Johnson, J., Andersson, C., Lestelius, M., Järnström, L., Rättö, P. & Blohm, E. (2009). Some properties of Flexographic Printing Plates and Aspects on Print Quality. Appita journal, 62(5), 371-378
Open this publication in new window or tab >>Some properties of Flexographic Printing Plates and Aspects on Print Quality
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2009 (English)In: Appita journal, ISSN 1038-6807, Vol. 62, no 5, p. 371-378Article in journal (Other academic) Published
Place, publisher, year, edition, pages
Appita, 2009
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-2064 (URN)
Available from: 2008-08-25 Created: 2008-08-25 Last updated: 2017-12-06Bibliographically approved
Järnström, L., Johansson, C. & Johnson, J. (2009). Ultraviolet-induced aging of flexographic printing plates studied by thermal and structural analysis methods. Journal of Applied Polymer Science, 112(3), 1636-1646
Open this publication in new window or tab >>Ultraviolet-induced aging of flexographic printing plates studied by thermal and structural analysis methods
2009 (English)In: Journal of Applied Polymer Science, ISSN 0021-8995, E-ISSN 1097-4628, Vol. 112, no 3, p. 1636-1646Article in journal (Refereed) Published
National Category
Chemical Engineering Materials Engineering Chemical Sciences Mathematics Mechanical Engineering
Research subject
Chemical Engineering; Materials Engineering; Chemistry; Mathematics; Mechanical Engineering
Identifiers
urn:nbn:se:kau:diva-9990 (URN)
Available from: 2012-02-08 Created: 2012-02-08 Last updated: 2017-12-07Bibliographically approved
Johnson, J. (2008). Aspects of Flexographic Print Quality and Relationship to some Printing Parameters. (Doctoral dissertation).
Open this publication in new window or tab >>Aspects of Flexographic Print Quality and Relationship to some Printing Parameters
2008 (English)Doctoral thesis, monograph (Other academic)
Series
Karlstad University Studies 2008:28, ISSN 14038099
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-17065 (URN)9789170631870 (ISBN)
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2013-01-21
Johnson, J. (2008). Aspects of Flexographic Print Quality and Relationship to some Printing Parameters. (Doctoral dissertation). Karlstad: Karlstad University
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. p. 99
Series
Karlstad University Studies, ISSN 1403-8099 ; 2008:28
Keywords
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
Opponent
Supervisors
Available from: 2008-08-25 Created: 2008-08-25 Last updated: 2011-11-28
Johnson, J., Lestelius, M., Blohm, E., Rättö, P. & Järnström, L. (2008). The Interaction between Water and Liner and Newsprint in a Flexographic CI-Printing Press. In: TAGA Conference, San Francisco, US.
Open this publication in new window or tab >>The Interaction between Water and Liner and Newsprint in a Flexographic CI-Printing Press
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2008 (English)In: TAGA Conference, San Francisco, US, 2008Conference paper, Published paper (Other academic)
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-2063 (URN)
Available from: 2008-08-25 Created: 2008-08-25 Last updated: 2019-07-11Bibliographically approved
Johnson, J., Rättö, P., Blohm, E., Lestelius, M. & Järnström, L. (2008). The Interaction between Water and Liner and Newsprint in Flexographic CI-Printing. In: : . Paper presented at TAGA Conference, San Francisco, US.
Open this publication in new window or tab >>The Interaction between Water and Liner and Newsprint in Flexographic CI-Printing
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2008 (English)Conference paper, Published paper (Other (popular science, discussion, etc.))
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-24557 (URN)
Conference
TAGA Conference, San Francisco, US
Available from: 2013-01-22 Created: 2013-01-22 Last updated: 2015-10-28Bibliographically approved
Johnson, J., Rättö, P., Lestelius, M. & Blohm, E. (2004). Measuring the Dynamic Nip Pressure in a Flexographic CI-Printing Press. Nordic Pulp and Paper Journal, vol.19,2004,pp 84-88
Open this publication in new window or tab >>Measuring the Dynamic Nip Pressure in a Flexographic CI-Printing Press
2004 (English)In: Nordic Pulp and Paper Journal, vol.19,2004,pp 84-88Article in journal (Refereed)
Abstract [en]

The dynamic pressure in a flexographic printing press was measured and the influence of impression, speed and choice of printing plate on the dynamic pressure was analysed. The measurements were complemented by measurements to assess the ink transfer to the substrate

National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-21346 (URN)
Projects
Effect of moisture, temperature, pressure and substrate on print quality in flexography
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2019-07-09
Johnson, J., Rättö, P., Lestelius, M. & Järnström, L. (2003). Dynamic Nip Pressure in a Flexographic CI-Printing Press. Paper presented at TAGA´s 55th Annual Technical Conf.,Montreal,Canada,April,2003. Paper presented at TAGA´s 55th Annual Technical Conf.,Montreal,Canada,April,2003.
Open this publication in new window or tab >>Dynamic Nip Pressure in a Flexographic CI-Printing Press
2003 (English)Conference paper, Published paper (Refereed)
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-18478 (URN)
Conference
TAGA´s 55th Annual Technical Conf.,Montreal,Canada,April,2003
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2019-07-11
Johnson, J., Rättö, P., Blohm, E., Lestelius, M. & Järnström, L. (2003). Interaction Between Water and Paperboard and Liner in a Flexographic Printing Press. Journal of Graphic Technology,vol.1(2),7-17(2003)
Open this publication in new window or tab >>Interaction Between Water and Paperboard and Liner in a Flexographic Printing Press
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2003 (English)In: Journal of Graphic Technology,vol.1(2),7-17(2003)Article in journal (Refereed)
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-20458 (URN)
Projects
Effect of moisture, temperature, pressure and substrate on print quality in flexography
Available from: 2013-01-21 Created: 2013-01-21 Last updated: 2019-07-11
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