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Publications (8 of 8) Show all publications
Thorman, S., Rydefalk, C., Hagman, A. & Granlöf, L. (2023). Rapid, Out-Of-Plane Compression of Paperboard – Influence of Impact Velocity on The Surface. In: TAPPICon 2023 - "Rock the Roll: Unleashing the Harmonies of the Paper Industry": . Paper presented at TAPPICon 2023 - Rock the Roll: Unleashing the Harmonies of the Paper Industry. Cleveland, USA. 28 April 2023 through 1 May 202. TAPPI Press
Open this publication in new window or tab >>Rapid, Out-Of-Plane Compression of Paperboard – Influence of Impact Velocity on The Surface
2023 (English)In: TAPPICon 2023 - "Rock the Roll: Unleashing the Harmonies of the Paper Industry", TAPPI Press , 2023Conference paper, Published paper (Refereed)
Abstract [en]

Industry processes, such as printing, subjects paperboard to rapid, Z-directional compression. However, measuring and evaluating the relevant properties in the thickness direction are not necessarily straight forward or easy. Measuring at relevant, millisecond, deformation rates complicate the problem further. The aim of the present work is to elucidate on some of the influences on the compressive stiffness. Both the initial material response and the overall compressibility of the paperboard is studied. In this project the effect on the material response from the surface structure and the millisecond time-scale recovery is explored. The method utilized is a machine called the Rapid ZD-tester. The device drops a probe in free fall on the substrate and records the probe-position, thus acquiring the deformation of the substrate. To investigate the time dependent stiffness behavior the probe is dropped several times at the same xy-position on the paperboard from different heights, thus achieving different impact velocities. The probe is also allowed to bounce several times on the surface before lifted for consecutive drops. The drop-bounce cycle allows study of the short-term recovery of the material. The material in the study is commercial paperboard. The paperboard samples are compared to material where the surface has been smoothed by grinding it. Our study shows that there is a non-permanent reduction in thickness and a stiffening per bounce of the probe, indicating a compaction that has not recovered in the millisecond timescale. Additionally, a higher impact velocity has an initial stiffening effect on the paperboards, and that this is reduced by smoothing the surface.

Place, publisher, year, edition, pages
TAPPI Press, 2023
Keywords
Compaction; Grinding (machining); Potassium hydroxide; Recovery; Stiffness; Compressive stiffness; Deformation rates; Free fall; Impact velocities; Industry process; Material response; Out-of-plane compression; Property; Thickness direction; Time-scales; Probes
National Category
Materials Engineering
Identifiers
urn:nbn:se:ri:diva-68042 (URN)2-s2.0-85175872990 (Scopus ID)
Conference
TAPPICon 2023 - Rock the Roll: Unleashing the Harmonies of the Paper Industry. Cleveland, USA. 28 April 2023 through 1 May 202
Available from: 2023-11-23 Created: 2023-11-23 Last updated: 2023-12-27Bibliographically approved
Thorman, S., Ström, G. & Gane, P. A. C. (2018). Impact of non-uniform water absorption on water-interference print mottle in offset printing. Nordic Pulp & Paper Research Journal, 33(1), 150-163
Open this publication in new window or tab >>Impact of non-uniform water absorption on water-interference print mottle in offset printing
2018 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 33, no 1, p. 150-163Article in journal (Refereed) Published
Abstract [en]

Print mottle is a serious and yet common print defect in offset printing. An imbalance between the feed of fountain solution and the ability of the paper substrate to absorb and transport this water away from the surface can cause moisture/water interference problems. In the study presented here, we have investigated the uniformity of aqueous absorption and coating structure of pilot-coated papers with different types and dosages of dispersants and linked this to print mottle and uncovered areas (UCA). In earlier studies, the print quality of these papers indicated that a moderate addition of excess dispersant caused ink refusal, ink-lift-off (ink-surface adhesion failure) and water-interference mottle when printing at elevated fountain feed. In the present study, we have shown that a majority of the samples with uneven water/moisture absorption and an uneven burn-out reflectance tended to have more severe printing problems related to surface-moisture/water.An aqueous staining technique was used to characterise the absorption non-uniformities. This method has been developed previously with focus on absorption of flexographic water-based inks but can clearly give relevant information also for offset printing, when it comes to moisture/water interference mottle. .

Keywords
absorption non-uniformity, coated paper, dispersant, offset printing, uncovered area, water-interference mottle, Fountains, Moisture, Dispersants, Non-uniformities, UnCovered Areas, Water interference mottles, Water absorption, Feeds, Interference, Mottle, Surfaces
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-34459 (URN)10.1515/npprj-2018-3011 (DOI)2-s2.0-85047988264 (Scopus ID)
Note

This study was performed within the Industrial Graduate School VIPP (Values Created in Fiber Based Processes and Products) with financial support from the Knowledge Foundation, Sweden (registration number 20100268). The study was partly funded with strategic competence funds from RISE, Sweden.

Available from: 2018-08-08 Created: 2018-08-08 Last updated: 2023-06-08Bibliographically approved
Rättö, P., Thorman, S., Rådsten Ekman, M. & Löfgren, C. (2017). Impact of base substrate on perceived and measured surface properties. In: 28th PTS Coating symposium, September 5-6, 2017, Munich, Germany: . Paper presented at 28th PTS Coating symposium, September 5-6, 2017, Munich, Germany (pp. 138-154).
Open this publication in new window or tab >>Impact of base substrate on perceived and measured surface properties
2017 (English)In: 28th PTS Coating symposium, September 5-6, 2017, Munich, Germany, 2017, p. 138-154Conference paper, Oral presentation with published abstract (Other academic)
Keywords
paperboard, perception, consumer package, substrate, surface treatment
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-33019 (URN)
Conference
28th PTS Coating symposium, September 5-6, 2017, Munich, Germany
Available from: 2018-01-10 Created: 2018-01-10 Last updated: 2023-06-08Bibliographically approved
Thorman, S. & Yang, L. (2016). Impact of individual board properties on flexographic print mottle. In: 14th TAPPI Advanced Coating Symposium 2016: . Paper presented at 14th TAPPI Advanced Coating Symposium 2016, 4 October 2016 through 6 October 2016 (pp. 6-9). TAPPI Press
Open this publication in new window or tab >>Impact of individual board properties on flexographic print mottle
2016 (English)In: 14th TAPPI Advanced Coating Symposium 2016, TAPPI Press , 2016, p. 6-9Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
TAPPI Press, 2016
Keywords
Absorption non-uniformity, Ink absorption, Print mottle, Surface roughness
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-42269 (URN)2-s2.0-85062289504 (Scopus ID)9781510877658 (ISBN)
Conference
14th TAPPI Advanced Coating Symposium 2016, 4 October 2016 through 6 October 2016
Available from: 2019-12-17 Created: 2019-12-17 Last updated: 2023-06-08Bibliographically approved
Yang, L., Thorman, S. & Teleman, A. (2014). Flexographic printability of packaging: challenges and new approaches (ed.). In: : . Paper presented at China academic conference on printing and packaging, 3rd, Beijing, October 24-25, 2014.
Open this publication in new window or tab >>Flexographic printability of packaging: challenges and new approaches
2014 (English)Conference paper, Published paper (Refereed)
Publisher
p. 42
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-9556 (URN)
Conference
China academic conference on printing and packaging, 3rd, Beijing, October 24-25, 2014
Available from: 2016-09-12 Created: 2016-09-12 Last updated: 2023-06-08Bibliographically approved
Yang, L., Thorman, S. & Teleman, A. (2014). Study on flexpgraphic printability of packaging. China Printing and Packaging Study, 6(6), 1-3
Open this publication in new window or tab >>Study on flexpgraphic printability of packaging
2014 (English)In: China Printing and Packaging Study, ISSN 1674-5752, Vol. 6, no 6, p. 1-3Article in journal (Other academic) Published
Keywords
flexography, packaging, topography, substrate, printability, print quality, mottling, paperboard
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-38251 (URN)
Available from: 2019-04-01 Created: 2019-04-01 Last updated: 2023-06-08Bibliographically approved
Thorman, S., Yang, L. & Hagberg, A. (2013). Simultaneous determination of absorption mottle and white-top mottle in the same area on coated boards (ed.). In: : . Paper presented at Advances in printing and media technology : proceedings of the 40th international research conference of iarigai, Chemnitz, Germany, 2013, pp 225-232.
Open this publication in new window or tab >>Simultaneous determination of absorption mottle and white-top mottle in the same area on coated boards
2013 (English)Conference paper, Published paper (Refereed)
Publisher
p. 8
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:ri:diva-9513 (URN)
Conference
Advances in printing and media technology : proceedings of the 40th international research conference of iarigai, Chemnitz, Germany, 2013, pp 225-232
Available from: 2016-09-12 Created: 2016-09-12 Last updated: 2023-06-08Bibliographically approved
Thorman, S., Ström, G. R., Hagberg, A. & Johansson, P. Å. (2012). Uniformity of liquid absorption by coatings: Technique and impact of coating composition (ed.). Nordic Pulp & Paper Research Journal, 27(2), 459-465
Open this publication in new window or tab >>Uniformity of liquid absorption by coatings: Technique and impact of coating composition
2012 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 27, no 2, p. 459-465Article in journal (Refereed) Published
Abstract [en]

The interaction between a liquid and a paper surface is important for a number of paper treatment processes, where absorption is of special significance during printing. Many absorption measurement techniques use a large available volume of liquid to characterise absorption, when compared to the volume of the coating. The uniformity of the absorption is also seldom characterised. We have developed a new technique, which is presented in this article, to study the uniformity of absorption of a small amount of liquid. This technique is based on the short-time absorption (tenth of a second) of a coloured liquid, the blotting of excess liquid and a characterisation of the pattern of the stain. This method made it possible to detect differences among coating layers with different compositions. In many cases, the absorption non-uniformity could be linked to variations in the coating thickness and/or wettability. The thinner and thicker areas of the coating layers were interpreted as having different pore structures. Neither the coating thickness nor the wettability could provide a full explanation, which showed the need to develop a method to characterise absorption uniformity instead of only relying on measuring the total absorption potential.

Keywords
Coated Board, Flexographic printing, Liquid absorption, Test Method
National Category
Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:ri:diva-9730 (URN)10.3183/NPPRJ-2012-27-02-p459-465 (DOI)2-s2.0-84865212541 (Scopus ID)
Available from: 2016-09-12 Created: 2016-09-12 Last updated: 2023-06-08Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-0866-1087

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