miun.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Print Uniformity of Corrugated Board in Flexo Printing: Effects of Corrugated Board and Halftone Dot Deformations.
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics. (FSCN – Fibre Science and Communication Network)
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences, Engineering and Mathematics.
Responsible organisation
2008 (English)In: Packaging technology & science, ISSN 0894-3214, Vol. 21, no 7, 385-394 p.Article in journal (Refereed) Published
Abstract [en]

Print non-uniformity problems are a major concern for flexo post-printers. Many of these non-uniformities are suspected to be caused by the corrugated board structure itself. Striping is the most obvious one, but also other print quality problems might be structure-related. This work focuses on how deformations of the board might lead to print non-uniformities, and if the deformation of halftone dots is the mechanism behind striping in halftone flexo post-printing. The problems were analysed by using finite element models to simulate deformed board and halftone dot compression in the printing nip. Distortions of the board due to non-uniform hygro-thermal strains were shown to be a potential cause of print non-uniformities. Striping in halftone prints was found to be caused by differences in dot gain between ridge and valley areas above the flute structure.

Place, publisher, year, edition, pages
2008. Vol. 21, no 7, 385-394 p.
Keyword [en]
corrugated board, dot gain, flexo, halftone, striping, warp
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-313DOI: 10.1002/pts.816ISI: 000260649100002Scopus ID: 2-s2.0-55649096951Local ID: 5139OAI: oai:DiVA.org:miun-313DiVA: diva2:1919
Projects
Nip Mechanics and Hydrodynamics of Flexo Post-Printing and Print Quality
Available from: 2008-12-11 Created: 2008-12-11 Last updated: 2010-03-05Bibliographically approved
In thesis
1. Striping on flexo post-printed corrugated board
Open this publication in new window or tab >>Striping on flexo post-printed corrugated board
2007 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Striping is the most common print non-uniformity on corrugated board. It is defined as periodic print density and/or print gloss variations parallel to the flutes. Corrugated boards are mainly printed with flexography, making striping a major concern for the flexographic post-printing industry. In spite of its long history, the basic mechanisms of striping have not been fully understood, and no concrete solution has been provided. The objective of this thesis is to obtain an understanding of the fundamental mechanisms behind and a solution to striping. Both experimental and numerical approaches have been taken in thiswork. Nonlinear finite element models have been constructed in both corrugated board and halftone dot scales to determine the pressure distributions in the printing nip. Ink transfer experiments have been performed to determine the print density vs. pressure relations. Parametric studies have been done for the effects of printing system variables and deformations. The results showed that striping is predominantly print density variations caused by pressure variations in the printing nip. The pressure variations are inherent to the corrugated board structure. Washboarding was shown to play a minor part in causing print density variations, but might contribute to gloss striping. A new printing plate design has been proposed to eliminate the pressure variations and hence the print density striping.

Place, publisher, year, edition, pages
Sundsvall: Mittuniversitetet, 2007
Series
Mid Sweden University licentiate thesis, ISSN 1652-8948 ; 26
Keyword
Kemiteknik
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-111 (URN)5136 (Local ID)978-91-85317-63-9 (ISBN)5136 (Archive number)5136 (OAI)
Presentation
2007-10-25, 102, M, Holmgatan 10, Sundsvall, 10:00 (English)
Opponent
Supervisors
Available from: 2008-02-18 Created: 2008-02-18 Last updated: 2009-06-08Bibliographically approved
2. Nip Mechanics, Hydrodynamics and Print Quality in Flexo Post-Printing
Open this publication in new window or tab >>Nip Mechanics, Hydrodynamics and Print Quality in Flexo Post-Printing
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Sundsvall: Kopieringen, 2010
National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-11347 (URN)
Public defence
(English)
Supervisors
Projects
Nip Mechanics and Hydrodynamics of Flexo Post-Printing and Print Quality
Available from: 2011-01-14 Created: 2010-03-05 Last updated: 2011-01-14Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Holmvall, MartinUesaka, Tetsu
By organisation
Department of Natural Sciences, Engineering and Mathematics
In the same journal
Packaging technology & science
Chemical Engineering

Search outside of DiVA

GoogleGoogle Scholar

Altmetric score

Total: 907 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf