The effect of shear-thickening on liquid transfer from an idealized gravure cell

Khandavalli, Sunilkumar; Lee, J. Alex; Pasquali, Matteo; Rothstein, Jonathan P.

doi:10.1016/j.jnnfm.2015.03.007

Cited by 18 publications

(15 citation statements)

References 57 publications

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“…The Trouton ratio at low Hencky strains,

T r = η_{E, 0} / η_{0}

, for all particle concentrations is approximately three as expected, Tr ≈ 3. The effect of particle concentration on extensional thickening is consistent with the observations in literature …”

Section: Methodsmentioning

confidence: 99%

“…At sufficiently large concentrations the particle dispersions can potentially shear‐thicken . The shear‐thickening particle dispersions have also been found to exhibit strong extensional thickening behavior . The combination of shear and extensional thickening behavior of the particle dispersions can significantly influence the printing/coating processes .…”

Section: Introductionmentioning

confidence: 99%

“…The shear‐thickening particle dispersions have also been found to exhibit strong extensional thickening behavior . The combination of shear and extensional thickening behavior of the particle dispersions can significantly influence the printing/coating processes . Here we investigate the behavior of shear‐thickening coating fluids on the stability of slot‐die coating process.…”

Section: Introductionmentioning

confidence: 99%

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The effect of shear‐thickening on the stability of slot‐die coating

Khandavalli

Rothstein

2016

AIChE Journal

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Slot‐die coating is an economical roll‐to‐roll processing technique with potential to revolutionize the fabrication of nano‐patterned thin films at high throughput. In this study, the impact of shear‐thickening of the coating fluid on the stability of slot‐die coating was investigated. For the coating fluid, a model system fumed silica nanoparticles dispersed in polypropylene glycol was chosen. These dispersions exhibit shear and extensional thickening characterized through steady shear and capillary break‐up measurements. The critical web velocity for the onset of coating defect for different flow rates was measured, while the type of coating defect was visualized using a high speed camera. For the shear thickening particle dispersions, the coating failed through the onset of a ribbing instability. The critical web velocity for the onset of coating defect was found to decrease with increasing particle concentration and increasing fluid viscosity. The minimum wet thickness was studied as a function of capillary number for the particle dispersions and compared with a series of Newtonian fluids with similar viscosities. In all cases, shear‐thickening behavior was found to stabilize coating by reducing the minimum wet coating thickness when compared against a Newtonian fluid with similar viscosity at the same capillary number. Conversely, the shear‐thinning fluids tested destabilized the coating by increasing the minimum wet thickness when compared against a Newtonian at the same capillary number. The impact of shear‐thickening on slot‐die coating was further studied by quantifying the evolution of the ribbing instability with increasing web speed and by conducting tests over a wide range of coating gaps. © 2016 American Institute of Chemical Engineers AIChE J, 62: 4536–4547, 2016

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“…The Trouton ratio at low Hencky strains,

T r = η_{E, 0} / η_{0}

, for all particle concentrations is approximately three as expected, Tr ≈ 3. The effect of particle concentration on extensional thickening is consistent with the observations in literature …”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The effect of shear‐thickening on the stability of slot‐die coating

Khandavalli

Rothstein

2016

AIChE Journal

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“…When the capillary number is less than 1, the surface tension effect has a significant influence on the ink transfer. For shear-thickening liquids, Sunilkumar Khandavalli et al investigated the impact of shear-thickening on the liquid Processes 2021, 9, 838 2 of 16 transfer from an idealized gravure cell by a combination of experiments and numerical computations [16]. It mainly measured the effect of speed change on the ink transfer rate to avoid certain states in the viscosity function that are not conducive to ink transfer.…”

Section: Introductionmentioning

confidence: 99%

Simulation of Shear-Thickening Liquid Transfer between U-Shaped Cell and Flat Plate

Dong

Xing

et al. 2021

Processes

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Based on the actual measurement of the shear-thickening properties of water-based inks, in order to improve the ink transfer rate, the PLIC (Piecewise Linear Interface Construction) interface tracking method and the VOF (Volume of Fluid) method are used to simulate the transfer process of the shear-thickening liquid between the U-shaped cell and the upwardly moving plate. The effects of substrate surface wettability, cell contact angle, and cell depth on liquid transfer were studied. The results showed that all can increase the liquid transfer rate, and the change of the cell contact angle also led to the difference in the breaking time of the liquid filament. In addition, the shallow plate effect was discovered in the study of cell depth. The shallow plate effect is a phenomenon by which the amount of liquid transferred and the liquid transfer rate are greatly improved when the depth of the cell decreases to a certain limit value. In addition, for the U-shaped cell, the optimization method combining the shallow printing plate effect and fillet can greatly improve the liquid transfer rate and solve the undesirable problems such as plate blocking. After optimization, a liquid transfer rate of about 85% can be achieved.

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“…A number of works are devoted to the study of structuring of printing ink in gravure printing. In particular, the transfer of the printing ink from the idealized cell of the form [2], the influence of the constricting shift on the ink transfer from the gravure print cell [3], the influence of the viscoelastic properties of ink [4,5] is investigated. During a flat offset printing machine operation, the circulating movement of ink is formed in an ink can (Fig 1).…”

Section: Introductionmentioning

confidence: 99%

Numerical study of printing ink structuring

Litunov

Gusak

Toshhakova

2018

J. Phys.: Conf. Ser.

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Abstract. The computational experiment showing the structuring of the printing ink, being a highly-filled suspension and possessing the property of thixotropy. The areas of structuring are shown. It is proved that the center of rotation of the structured area, and consequently their radius is little dependent on the ink viscosity and the rotational speed of the ink fountain roller. The volume of the structured area rotating without stirring is calculated, which makes 20% of the volume of the ink can filled with ink by 70%.

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The effect of shear-thickening on liquid transfer from an idealized gravure cell

Cited by 18 publications

References 57 publications

The effect of shear‐thickening on the stability of slot‐die coating

The effect of shear‐thickening on the stability of slot‐die coating

Simulation of Shear-Thickening Liquid Transfer between U-Shaped Cell and Flat Plate

Numerical study of printing ink structuring

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