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Flexographic Post-Printing of Corrugated Board: Contact Mechanics and Print Quality
Karlstad University, Faculty of Technology and Science.
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

As the corrugated board industry strives to produce products with a higher print quality in the converting stage, there is a need for a greater understanding of the factors influencing the final print quality and how we perceive the print. In this work, a method for quantifying the print quality of printed corrugated board is presented as well as methods that quantitatively characterize the mechanical interaction between the printing form and the corrugated board in the printing nip. The results of investigations addressing the impact of the mechanical properties of the printing form on ink transfer are also presented.

A band-pass image analysis method adapted to the spatial wavelength of B-flute corrugated board was used to quantify the print quality on the board in terms of print banding. The findings were substantiated by a perceptual evaluation which showed a high correlation to the instrumental quantification.

The main cause of print banding is a higher local contact pressure on the fluting tips than in the fluting valleys, which leads to a higher ink transfer to the fluting tips. A greater difference between the local contact pressure on the fluting tips than in the fluting valleys generated a higher degree of banding. The difference in local contact pressure as well as nip force variations could be measured using the proposed methods to characterize the interaction between the printing form and the corrugated board. The difference in local contact pressure was highly dependent on the mechanical properties of the components of the printing form. An increase in the stiffness in compression mode and in the bending stiffness of the printing form led to a smaller contact area in the printing nip and consequently a higher external pressure on the ink, resulting in an overall higher ink transfer but also a higher degree of banding.

The influence of the mechanical properties of the printing form components was supported by the results of numerical simulations of the contact between the printing form and the corrugated board. Contact area, pressure level and texture of the local contact pressure were compared with measurements of local contact pressures for different printing forms and the results showed a high degree of agreement. Numerical simulations could thus predict the print quality achieved with different printing forms under different printing conditions.

Place, publisher, year, edition, pages
Fakulteten för teknik- och naturvetenskap , 2006.
Series
Karlstad University Studies, ISSN 1403-8099 ; 2006:13
Keyword [en]
Flexography, Corrugated board, Post-printing, Contact mechanics, Print quality
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-537ISBN: 91-7063-043-7 (print)OAI: oai:DiVA.org:kau-537DiVA: diva2:6213
Public defence
2006-05-19, 9C203 (Nyqvistsalen), 9C, Karlstads universitet, Karlstad, 10:30 (English)
Opponent
Supervisors
Available from: 2007-01-23 Created: 2007-01-23 Last updated: 2010-05-17
List of papers
1. Quantification of Banding on Printed Corrugated Board Using Spatial Frequency Analysis
Open this publication in new window or tab >>Quantification of Banding on Printed Corrugated Board Using Spatial Frequency Analysis
2005 (English)In: Packaging Tecnology and Science, Vol. 18, no 2, 89-95 p.Article in journal (Refereed) Published
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-5636 (URN)
Available from: 2010-05-12 Created: 2010-05-12 Last updated: 2010-05-17Bibliographically approved
2. Flexo Print of Corrugated Board: Mechanical Aspects of the Plate and Plate Mounting Materials
Open this publication in new window or tab >>Flexo Print of Corrugated Board: Mechanical Aspects of the Plate and Plate Mounting Materials
Show others...
2005 (English)In: TAGA Journal, Vol. 2, 16-28 p.Article in journal (Refereed) Published
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-5637 (URN)
Available from: 2010-05-12 Created: 2010-05-12 Last updated: 2010-05-17Bibliographically approved
3. Evaluation of Pressure Variations Generated During Flexographic Post-Print of Corrugated Board and Effects of Mechanical Properties of Printing Forms on Printed Banding
Open this publication in new window or tab >>Evaluation of Pressure Variations Generated During Flexographic Post-Print of Corrugated Board and Effects of Mechanical Properties of Printing Forms on Printed Banding
Show others...
2004 (English)In: 56th Annual TAGA Technical Conference Proceedings, TAGA, Pennsylvania, U.S.A, 2004, 114-126 p.Conference paper, Published paper (Refereed)
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-5647 (URN)
Conference
Annual TAGA Technical Conference
Available from: 2010-05-17 Created: 2010-05-17 Last updated: 2010-05-17Bibliographically approved
4. Dynamic measurements of nip force variations during post-printing of corrugated board
Open this publication in new window or tab >>Dynamic measurements of nip force variations during post-printing of corrugated board
2006 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, Vol. 20, no 1, 111-114 p.Article in journal (Refereed) Published
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-5648 (URN)
Available from: 2010-05-17 Created: 2010-05-17 Last updated: 2010-05-17Bibliographically approved
5. Impact of Different Printing Forms on Print Banding on Post-Printed Corrugated Board: Experimental and Numerical Investigations
Open this publication in new window or tab >>Impact of Different Printing Forms on Print Banding on Post-Printed Corrugated Board: Experimental and Numerical Investigations
2006 (English)Conference paper, Published paper (Refereed)
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-5649 (URN)
Conference
Printing Technology SPb'06, St. Petersburg, Russia, 26-30 June, 2006
Available from: 2010-05-17 Created: 2010-05-17 Last updated: 2010-05-17Bibliographically approved

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