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Gidlöf, Veronica
Publications (6 of 6) Show all publications
Gidlöf, V. (2005). In Press Conditions and its Effect on Runnability and Convertability in Digital Package Printing. Packaging Technology and Science, 18(4), 189-197
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, p. 189-197Article 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.

Keywords
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
Gidlöf, V. (2004). Critical Factors for digital Printing on Paperboard: Runnability, Functionality & Print Quality. (Licentiate dissertation). Linköping University
Open this publication in new window or tab >>Critical Factors for digital Printing on Paperboard: Runnability, Functionality & Print Quality
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
Keywords
Digital printing, paperboard, electrophotography
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-5732 (URN)3836 (Local ID)91-85295-11-6 (ISBN)3836 (Archive number)3836 (OAI)
Presentation
(English)
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2011-04-06Bibliographically approved
Gidlöf, V., Dahlström, M. & Granås, J. (2004). Functionality in Digital Package Printing. In: TAGA Proceedings 2004.
Open this publication in new window or tab >>Functionality in Digital Package Printing
2004 (English)In: TAGA Proceedings 2004, 2004Conference paper, Published 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.

Keywords
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
Gidlöf, V. (2004). Visuell bedömning av tryckkvalitet - Teorier, metoder och instruktioner.
Open this publication in new window or tab >>Visuell bedömning av tryckkvalitet - Teorier, metoder och instruktioner
2004 (Swedish)Report (Other academic)
Abstract [sv]

Visuell bedömning av tryckkvalitet anses av många ingenjörer som en mjuk vetenskap, men detta är enligt Peter Engeldrum inte alls en korrekt uppfattning. Undviks den visuella bedömningen kommer kundens upplevelse, som är den viktigaste, att ignoreras. För att erhålla struktur och beskriva tryckkvalitet som en helhet har visuell bedömning sammanlänkats med fysiska bildparametrar och tekniska variabler till en modell som kallas tryckkvalitetscirkeln. Utifrån tryckkvalitetscirkeln skall det därav vara möjligt att gå mellan subjektiva bedömningsvärden och objektiva mätvärden genom olika beräkningar. Beroende av vilken bedömningsmetod som tillämpas kan dock olika information och skalor genereras. Vissa bedömningsmetoder skapar möjligheten att generera innehållsrika skalor som till fullo kan användas i tryckkvalitetscirkeln, medan vissa innehåller lägre nivå av information och är därav inte lika användbara. De skalor som kan genereras är nominal-, ordinal-, intervall- och kvotskalor. Vilken bedömningsmetod som väljs är beroende av vilken skala som vill genereras, men även beroende av studiens syfte, bildinnehåll, observationsinsatser och provantal.

Keywords
Visuell bedömning, tryckvalitet
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-3702 (URN)3837 (Local ID)3837 (Archive number)3837 (OAI)
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2011-04-06Bibliographically approved
Gidlöf, V. (2003). Runnability in Digital Package Printing. In: 2003 Proceedings-Technical Associations of the Graphic Arts, TAGA, Montreal, Que., Canada (pp. 39-40).
Open this publication in new window or tab >>Runnability in Digital Package Printing
2003 (English)In: 2003 Proceedings-Technical Associations of the Graphic Arts, TAGA, Montreal, Que., Canada, 2003, p. 39-40Conference paper, Published paper (Other academic)
Abstract [en]

Digital printing is a fast growing technology and several paper qualities have already been developed for this application. Digital package printing is on the other hand 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. Because of future requirements, it is very important for the packaging industry to gain knowledge about the interaction between the substrate and the press, especially when it comes to runnability. This study reports on a runnability test on five different highly topical print units and ten different substrates. The print units were based on both electrophotographic technology and liquid toner technology and all printers except two were sheet fed. In order to attain a broad study, three different types of board were used; coated liquid packaging board, craft paper for sacks and coated graphical board and finally a commercial paper for digital printing as benchmark. Results shows that sheet fed printers have a low acceptance for curl and deformed sheets. Well cut sheets, right thickness and opacity is also very important in this context. When it comes to runnability in the web fed printer, problems often occurs in the cutting unit.

Keywords
digital, electrophotography, liquid, print, runnability, substrates
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-3699 (URN)3827 (Local ID)3827 (Archive number)3827 (OAI)
Available from: 2008-09-30 Created: 2008-09-30 Last updated: 2011-04-06Bibliographically approved
Gidlöf, V. & Lestelius, M. 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.

Keywords
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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