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Measurements and dimensional scaling of spontaneous imbibition of inkjet droplets on paper
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Medicinteknik.ORCID iD: 0000-0003-3110-3646
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik. KTH Royal Institute of Technology, Sweden.
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Life Science.ORCID iD: 0000-0003-0195-3850
RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Material och ytteknik.ORCID iD: 0000-0002-6394-6990
2016 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 31, no 1, p. 156-169Article in journal (Refereed) Published
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Abstract [en]

We investigate theoretically and experimentally the spontaneous imbibition of water based inkjet formulations utilizing paper capillary rise and imbibition of inkjet drops. We approximate the paper structure to a two dimensional anisotropic porous material, and using Darcy's law as a base, we derive dimensionless groups that scale drop imbibition. This derivation is based on a previous dimensional scaling of drop imbibition on thick isotropic porous material. We apply this scaling to a paper substrate by measuring the average drop imbibition rate, and perform paper capillary rise experiments to obtain the average system parameters required for the scaling. The results suggest that this approach is a valuable tool to predict drop imbibition rates on paper. We then continue and perform the same sets of experiments on a different paper with similar structure that is surface treated (surface sized) with CaCl2 salt, an additive that is known to improve print quality. We find that due to rapid aggregation of the colorant ink by the CaCl2, the imbibition rate is slowed down in the capillary rise experiments, i.e., on much larger scales compared to a single inkjet drop. However, the presence of CaCl2 has only minor effect over the average imbibition rates of single drops. Imbibition rates on the CaCl2 surface sized paper did not give adequate scaling as a result of the fact that the aggregation was not included the theoretical assumptions behind the scaling.

Place, publisher, year, edition, pages
SPCI , 2016. Vol. 31, no 1, p. 156-169
Keywords [en]
aggregation, Darcy flow, dimensional scaling, divalent cations, imbibition, infiltration, ink, inkjet, paper, porous material
National Category
Paper, Pulp and Fiber Technology Manufacturing, Surface and Joining Technology
Identifiers
URN: urn:nbn:se:ri:diva-94DOI: 10.3183/npprj-2016-31-01-p156-169Scopus ID: 2-s2.0-84961674015OAI: oai:DiVA.org:ri-94DiVA, id: diva2:932111
Available from: 2016-05-31 Created: 2016-04-28 Last updated: 2019-06-17Bibliographically approved

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Oko, AsafNiga, PetruSwerin, Agne

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