Modeling inkjet dots from drop spreading, absorption and evaporation – An engineering approach

Waldner, Carina; Ritzer, Alfons; Hirn, Ulrich

doi:10.1016/j.colsurfa.2023.131986

Colloids and Surfaces A: Physicochemical and Engineering Aspect

2023

DOI: 10.1016/j.colsurfa.2023.131986

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Modeling inkjet dots from drop spreading, absorption and evaporation – An engineering approach

Carina Waldner

Alfons Ritzer

Ulrich Hirn

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2024

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Cited by 4 publications

References 43 publications

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Liquid penetration in hydrophobised cellulose based sheets

Nicasy,

Waldner,

Erich

et al. 2024

Cellulose

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Controlling the liquid transport within cellulose-based materials is crucial for numerous applications, including printing, bio-assays, packaging, and cleaning. To control liquid transport and quality, post-processes such as calendering, a way of compressing and smoothen the paper using hard pressure rollers, and hydrophobisation, are commonly employed. To understand how these processes influence liquid uptake, this study uses an Ultra-Fast Imaging (UFI) NMR method to analyse moisture profiles during liquid uptake in various cellulose-based paper sheets with diverse levels of hydrophobisation and calendering. It is demonstrated that calendering decreases penetration speed and increases swelling. The reduction in penetration speed could be linked to a decrease in permeability upon calendering, as measured by the Gurley air permeance. Additionally, it is observed that hydrophobisation delayed and slowed down liquid uptake in the paper samples, and, in extreme cases, completely altered the liquid uptake phenomena. With substantial hydrophobisation, liquid penetration no longer proceeded with a well-defined liquid front but exhibited huge levels of fingering. Furthermore, is was observed that within highly hydrophobised paper, fibres were first prewetted, initiating a first swelling, before the pores between fibres could be filled. Subsequently, water could enter the pores between, allowing fibre bonds to be broken, leading to a second swelling of the paper sheet. The improved understanding will contribute to better control of the flow within cellulose-based materials, benefiting applications such as printing, packaging and microfluidics.

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Liquid penetration in hydrophobised cellulose based sheets

Nicasy,

Waldner,

Erich

et al. 2024

Cellulose

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Enhanced color density from high-viscosity inkjet inks

Phillips,

Claypole,

Clifford

et al. 2024

J Coat Technol Res

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Inkjet printing inks are typically limited to low viscosities, employing highly dilute inks with low pigment loading compared with inks for other printing processes. This reduces color intensity, limits productivity, and requires higher drying energy. This study compares standard-viscosity graphic inkjet inks (~13 mPa.s shear viscosity) with higher-viscosity inkjet inks (~60 mPa.s), traditionally considered outside the normal jetting range, for print outcomes on corrugated cardboard with both white coated and brown uncoated liners. Higher-viscosity inks imparted greater color density to the print; this was assessed as being due to both the inherently higher viscosity of the ink reducing penetration into the substrate and the higher pigment loading capable of being contained within these inks. While standard-viscosity inks tended to plateau in color intensity as ink coverage was increased, higher-viscosity inks could increase in intensity throughout the entire coverage range on coated white liner. This effect was dependent on the substrate, with the coated white liner exhibiting up to a 67% increase in maximum color density but the uncoated brown liner showing up to a 13% increase. It is envisaged that wider adoption of higher-viscosity inks can increase both color intensity and printing speed, thus making inkjet more competitive with conventional printing processes.

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Jettability and printability of customized gold nanoparticles-based ink on flexible substrate through inkjet printing process

Shariq,

Rudolf,

Majerič

et al. 2024

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Modeling inkjet dots from drop spreading, absorption and evaporation – An engineering approach

Cited by 4 publications

References 43 publications

Liquid penetration in hydrophobised cellulose based sheets

Liquid penetration in hydrophobised cellulose based sheets

Enhanced color density from high-viscosity inkjet inks

Jettability and printability of customized gold nanoparticles-based ink on flexible substrate through inkjet printing process

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