Emptying of gravure cavities containing shear-thinning and shear-thickening liquids

Wu, Jyun Ting; Carvalho, Márcio S.; Kumar, Satish

doi:10.1016/j.jnnfm.2019.04.001

Cited by 7 publications

(3 citation statements)

References 39 publications

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“…The inks used in printing are usually non-Newtonian fluids [12], which mainly include shear-thickening liquids and shear-thinning liquids [13]. By simulating the transfer of Newtonian fluid between plates, we found inertia driving fluid toward the surface with the higher contact angle and wettability driving fluid toward the surface with the lower contact angle.…”

Section: Introductionmentioning

confidence: 89%

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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Section: Introductionmentioning

confidence: 89%

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

Dong

Xing

et al. 2021

Processes

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“…As a consequence, rather than consider the gravure printing process in its full complexity, simplified model problems have been proposed to isolate specific phenomena to understand the fundamental aspects of gravure [27,28,32,[34][35][36][37][38]. However, the real complex interplay among all the involved phenomena, parameters and different gravure printing sub-processes suggests a process design guided by general considerations [39]. To this aim, dimensional analysis is a useful approach for simplifying the study of the complex multi-physical system behavior.…”

Section: Overview Of Gravure Printingmentioning

confidence: 99%

Gravure Printing for Lithium-Ion Batteries Manufacturing: A Review

Montanino,

Sico

2023

Batteries

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Interest in printed batteries is growing due to their applications in our daily lives, e.g., for portable and wearable electronics, biomedicals, and internet of things (IoT). The main advantages offered by printing technologies are flexibility, customizability, easy production, large area, and high scalability. Among the printing techniques, gravure is the most appealing for the industrial manufacture of functional layers thanks to its characteristics of high quality and high speed. To date, despite its advantages, such technology has been little investigated, especially in the field of energy since it is difficult to obtain functionality and adequate mass loading using diluted inks. In this review, the recent results for printed lithium-ion batteries are reported and discussed. A methodology for controlling the ink formulation and process based on the capillary number was proposed to obtain high printing quality and layer functionality. Specific concerns were found to play a fundamental role for each specific material and its performance when used as a film. Considering all such issues, gravure can provide high performance layers. A multilayer approach enables the desired layer mass loading to be achieved with advantages in terms of bulk homogeneity. Such results can boost the future industrial employment of gravure printing in the field of printed batteries.

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“…Since the ink used for printing is a non-Newtonian fluid containing different additives such as functional additives, binders, and active pigments, 67,68) it is also imperative to check the effect of rheological properties on ink transfer. Several numerical studies are being conducted to check ink transfer between the plate and cell considering the non-Newtonian rheological properties of ink, 69,70) however, only the shear rate-dependent non-Newtonian model is considered. Hence, further research is required to evaluate the effect of the complex rheological properties of real inks on ink transfer.…”

Section: Ink Rheologymentioning

confidence: 99%

Fully roll-to-roll gravure printed electronics: challenges and the way to integrating logic gates

Tiara

Moon

Cho

et al. 2022

Jpn. J. Appl. Phys.

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Printed electronics have been considered to bring about the ICT (Information Communication Technology) revolution. The high-throughput production of the ultra-low-cost printed devices along with the level of integration of logic gates via an all roll-to-roll (R2R) printing method has been the major axes in the revolution. However, there have been certain concerns related to the integration of logic gates via the R2R printing methods. This review paper focuses on the key issues that must be resolved to maintain a uniform threshold voltage (V th) value, which can otherwise impede the commercial viability of such devices. Amongst the various factors contributing to the ΔV th value, the ink rheology, web handling, and the disparity in alignment amongst the drain-source electrodes and the gate electrodes due to the limitations of an overlay printing registration accuracy (OPRA) were reviewed to effectively control the variations during the R2R printing process, without including the material’s intrinsic instability factors. Accordingly, a unique design rule for the R2R printing foundry concept was introduced for manufacturing the devices with the available integration level of the logic gates, incorporating the printing parameters including ink rheology, ink transfer, web handling, and OPRA.

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Emptying of gravure cavities containing shear-thinning and shear-thickening liquids

Cited by 7 publications

References 39 publications

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

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

Gravure Printing for Lithium-Ion Batteries Manufacturing: A Review

Fully roll-to-roll gravure printed electronics: challenges and the way to integrating logic gates

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