Novel methods to characterize ink - Coating interactions, coating structure and surface energy

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Stenius, Per
dc.contributor.author Ma, Deqiang
dc.date.accessioned 2012-12-13T09:30:04Z
dc.date.available 2012-12-13T09:30:04Z
dc.date.issued 2009
dc.identifier.isbn 978-951-22-9882-2 (electronic)
dc.identifier.isbn 978-951-22-9881-5 (printed)
dc.identifier.issn 1797-5093 (electronic)
dc.identifier.issn 1797-4496 (printed)
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/6141
dc.description.abstract The main focus of this thesis is to analyze capillary adsorption of heterogeneous porous paper coatings. The approach is to develop a novel Gibbs energy model, analyze the structure and surface energy parameters of pilot coated paper and board samples, and compare results to ink tack kinetics. Recent studies have modeled and verified that when inertial force and kinetic energy are included, a smaller diameter capillary starts to fill faster. In addition, other retarding forces, such as local transient sticking of the ink vehicle at surface asperities or chemical inhomogeneities, capillary surface topography and connections between capillaries or physical inhomogeneities in coating, affect the total rate of imbibition. While these resistant factors are very important none of them changes the fact that the basic force driving spontaneous imbibition is the total liquid sorption energy in all various capillaries. This thesis suggests that the change in Gibbs free energy of a liquid associated with its imbibition into capillaries of coating can be used to describe such driving energy. It first derives an expression for this quantity then shows how specific Gibbs energy correlates with the time to reach maximum ink tack, tmax for carbonate-kaolin and latex based coatings. The application of the Gibbs energy model shows that for a relatively constant liquid-solid-vapor interface a larger capillary pore surface area strongly increases the rate of ink setting, as measured by the reduced tmax. In contrast, there is no correlation between ink tack development and pigment surface area or peak pore size of the coating which are currently in use. This new model analyzing Gibbs energy has advantages of combining porous structure variables (volume and diameter, Σ(Vi/Di)) and surface energy parameters (γcosθ) at the interface which often vary concurrently when coating components change, and being independent of many details of time-dependent variables. Surface topography affects liquid-solid-vapor/air interfaces. The second part of the thesis describes simultaneous characterization of surface topographies, using Near-field scanning optical microscopy. Finally, the thesis relates light scattering and absorption to the influence of fine kaolin and carbonates on coating structure and water soluble chemical such as fluorescence whitening agent distribution and efficiency in paper coating. en
dc.format.extent 75 + app. 67
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher Helsinki University of Technology, Department of Forest Products Technology en
dc.publisher Teknillinen korkakoulu, Puunjalostustekniikan laitos fi
dc.relation.ispartofseries TKK Reports in Forest Products Technology en
dc.relation.ispartofseries A 8
dc.relation.haspart [Publication 1]: Deqiang Ma, R. Douglas Carter, Janne Laine, and Per Stenius. 2007. Gibbs energy analysis of ink oil imbibition during ink setting. Nordic Pulp and Paper Research Journal, volume 22, number 4, pages 523-528. © 2007 by authors.
dc.relation.haspart [Publication 2]: Deqiang Ma, R. Douglas Carter, Janne Laine, and Per Stenius. 2008. Gibbs energy of imbibition of non-polar and polar solutions into calcium carbonate and kaolin coatings. Nordic Pulp and Paper Research Journal, volume 23, number 3, pages 333-338. © 2008 by authors.
dc.relation.haspart [Publication 3]: Deqiang Ma, R. Douglas Carter, Janne Laine, and Per Stenius. 2009. The influence of coating structure and surface energy on Gibbs energy of ink oil imbibition during ink setting. Nordic Pulp and Paper Research Journal, volume 24, number 2, pages 213-218. © 2009 by authors.
dc.relation.haspart [Publication 4]: Deqiang Ma, R. Douglas Carter, David Haefner, and Aristide Dogariu. 2008. Simultaneous characterization of coated paper topography and optical contrast by near-field scanning optical microscopy (NSOM). Nordic Pulp and Paper Research Journal, volume 23, number 4, pages 438-443. © 2008 by authors.
dc.relation.haspart [Publication 5]: Deqiang Ma, R. Douglas Carter, David Haefner, and Aristide Dogariu. 2008. The influence of fine kaolin and ground calcium carbonates on the efficiency and distribution of fluorescence whitening agents (FWA) in paper coating. Nordic Pulp and Paper Research Journal, volume 23, number 3, pages 327-332. © 2008 by authors.
dc.relation.haspart [Publication 6]: Deqiang (Dan) Ma, R. Douglas Carter, Robert E. Hardy, and Ching-Yih Chen. 2005. Print mottle reduction through clay engineering and pore structuring in paper coating. In: Proceedings of the 2005 TAPPI Coating Conference and Exhibit. Toronto, Ontario, Canada. 17-20 April 2005. TAPPI Press. CD-rom, Session 27.
dc.relation.haspart [Publication 7]: Deqiang Ma, R. Douglas Carter, and Douglas W. Bousfield. 2008. Prediction of coating structure change during calendering. In: Proceedings of the 10th TAPPI Advanced Coating Fundamentals Symposium. Montréal, Québec, Canada. 11-13 June 2008. Atlanta, USA. TAPPI Press. Pages 121-132.
dc.subject.other Materials science en
dc.subject.other Publication en
dc.title Novel methods to characterize ink - Coating interactions, coating structure and surface energy en
dc.type G5 Artikkeliväitöskirja fi
dc.contributor.school Kemian tekniikan korkeakoulu fi
dc.contributor.school School of Chemical Technology en
dc.contributor.department Puunjalostustekniikan laitos fi
dc.contributor.department Department of Forest Products Technology en
dc.subject.keyword coating structure en
dc.subject.keyword Gibbs energy en
dc.subject.keyword surface energy en
dc.subject.keyword capillary adsorption en
dc.subject.keyword topography en
dc.subject.keyword scattering en
dc.identifier.urn URN:ISBN:978-951-22-9882-2
dc.type.dcmitype text en
dc.type.ontasot Doctoral dissertation (article-based) en
dc.type.ontasot Väitöskirja (artikkeli) fi
dc.contributor.supervisor Laine, Janne
dc.opn Järnström, Lars
dc.date.defence 2009-05-12


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