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Critical Factors for digital Printing on Paperboard: Runnability, Functionality & Print Quality
Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media. (DPC - Digital printing center)
2004 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

More than ten years ago, the first digital print units were introduced on the market and since then, the technology has developed rapidly. Digital printing on packaging material is, however, a rather new area, but a probable prediction is that there soon will be a market need for board products that can be used for digital printing. In order to become successful in digital packaging printing it is, however, important to gain knowledge about the interaction between the substrate and the press, when it comes to runnability, functionality and print quality. Test printing was performed on paperboard, in digital print units based on both dry and liquid toner electrophotographic technology. Print quality was mainly investigated with subjective evaluation. Regarding functionality, investigation of taste and odor,creasing, toner adhesion and stability of whiteness in digital printed paperboard were performed. The runnability was investigated by subjective observances during printing trials, but also additive mesaurements. The subjective print quality evaluation indicated that paperboard, successfully could be used within digital printing in the same extent as paper grades. The differences in print quality were mainly explained with different characteristics of the paperboard i.e. if the paperboard, for example,had initial unevenness, high roughness or higher moisture content. However, the print units and their settings, also, played an important role. The functionality studies mainly showed a positive result, but regarding toner adhesion some problems occurred in the liquid toner technology. Furthermore, the three main problems concerning runnability were; feeding in sheet fed print units, cutting in web fed print units and increasing curl or non-flatness after printing.

Place, publisher, year, edition, pages
Linköping University , 2004.
Series
Linköping studies in science and technology. Licentiate thesis, ISSN 0280-7971 ; 1141
Keyword [en]
Digital printing, paperboard, electrophotography
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:miun:diva-5732Local ID: 3836ISBN: 91-85295-11-6 (print)OAI: oai:DiVA.org:miun-5732DiVA: diva2:30765
Presentation
(English)
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2011-04-06Bibliographically approved
List of papers
1. In Press Conditions and its Effect on Runnability and Convertability in Digital Package Printing
Open this publication in new window or tab >>In Press Conditions and its Effect on Runnability and Convertability in Digital Package Printing
2005 (English)In: Packaging Technology and Science, ISSN 0894-3214, Vol. 18, no 4, 189-197 p.Article in journal (Refereed) Published
Abstract [en]

A major advantage of digital printing is that printing can be performed ondemand, but as all printing techniques it suffers from its specific runnability problems. This study reports on an investigation of problems during printing and how to improve the runnability, with the aim of pointing out the most critical factors. Test printing has been performed on three different paperboard types in digital print units based on both dry and liquid toner electrophotographic technology. Results show that the three main problems during printing were; feeding in sheet fed print units, cutting in web fed print units and increasing curl after printing. Feeding problems in sheet fed print units were mainly explained by curl and varying format size of the paperboard, but also by exceeding thicknesses limits for the press. Curl after printing principally occurred due to high temperature loads caused by, for example, fusing and conditioning.

Keyword
Digital Printing, Paperboard, Runnability, Improvements
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-3701 (URN)10.1002/pts.690 (DOI)000231366800004 ()3830 (Local ID)3830 (Archive number)3830 (OAI)
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2011-04-06Bibliographically approved
2. Functionality in Digital Package Printing
Open this publication in new window or tab >>Functionality in Digital Package Printing
2004 (English)In: TAGA Proceedings 2004, 2004Conference paper, (Other academic)
Abstract [en]

More than ten years ago, the first digital print units were introduced on the market and since then, the technology has developed rapidly. Today there is an interest in trying digital printing also for packages. Digital printing on paperboard may, however, require slightly different criteria than digital printing on paper, due to different characteristics. A very important factor in the Packaging Industry is, for example, the functionality after printing. This study reports on an investigation of the packaging functionalities; taste and odor, creasing, toner adhesion and stability of whiteness in digital printed paperboard. Test printing has been performed in digital print units based on both electrophotography and liquid toner technology. Furthermore, three different board types, one sack paper and a fine paper for digital printing were used. Results show that, whiteness stability, taste and odor are marginally affected after printing, but in some cases the amounts of volatile substances increase substantially. Furthermore, toner adhesion is relatively good, but some problems occur in liquid toner technology. The appearance of folding cracks, during manual folding, occurred rarely.

Keyword
digital, electrophotography, print, functionality, substrates
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-3700 (URN)3829 (Local ID)3829 (Archive number)3829 (OAI)
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2011-04-06Bibliographically approved
3. Critical Print Quality Factors during Digital Printing on Paperboard - a Subjective Evaluation
Open this publication in new window or tab >>Critical Print Quality Factors during Digital Printing on Paperboard - a Subjective Evaluation
(English)Manuscript (preprint) (Other academic)
Abstract [en]

A major advantage of digital printing is that printing can be preformed on-demand. In order to become successful in packaging printing it is important for the digital techniques to achieve a print quality comparable to or better than conventional technologies. Since one of the top consumer considerations in purchasing a product is image quality, along with purchase factors like cost. This paper reports on an investigation into the print quality of digital printed paperboard with a subjective evaluation. Test printing has been performed with three different types of paperboard in digital print units based on both dry and liquid toner electrophotographic technology. The subjective evaluation produced different results for print units and substrates, where the most influencing quality factors were low contrast, low gloss, color shifting and mottling. Several of the factors, that were judged to produce a poor print quality, could to some extent be explained with the high humidity content of the paperboard, but also paperboard properties like roughness and print units settings like transfer currents and conditioning.

Keyword
Digital printing, Electrophotography, Print quality, Subjective evaluation, Paperboard
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-6330 (URN)3832 (Local ID)3832 (Archive number)3832 (OAI)
Available from: 2009-10-06 Created: 2009-10-06 Last updated: 2011-04-06Bibliographically approved

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