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

Dong, Ling; Xing, Jiefang; Wu, Shuang; Guan, Xiaofei; Zhu, Hongtao

doi:10.3390/pr9050838

Cited by 5 publications

(3 citation statements)

References 44 publications

(50 reference statements)

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“…These three stages are all observed clearly at different separation velocities, indicating the universal breakup dynamics. 46,47 However, the transfer ratio observed here are relatively low (∼0.2), and thus more ink property adjustments are needed to improve the ink transfer.…”

Section: ■ Results and Discussionmentioning

confidence: 79%

Total Liquid Transfer with Enhanced Contact Line Slippage

You

Liao

2022

Langmuir

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A new surface treatment method is developed to achieve total liquid transfer. The transfer process of a liquid droplet is recorded through high-speed photography and analyzed via image analysis to investigate the hydrodynamic interactions. For a pristine PMMA surface, a viscous and viscoelastic liquid facilitates transfer by increased viscous and inertial forces and delayed liquid bridge breakage but is limited by slow contact line slippage. Hydrophobic surface treatments can increase contact line slippage and the receding angle to achieve transfer ratios up to 98%. However, pinning and contact angle hysteresis from surface roughness features limit liquid transfer, especially for smaller droplets and higher separation velocities. A lubricant-infused surface treatment with PDMS and a thin layer of less viscous silicone oil provides a smooth, homogeneous surface with fast slippage, low contact angle hysteresis, and only a slight oil wetting ridge. Liquid could then transfer at high ratios (∼99.9%), regardless of droplet size and separation velocity. Finally, complete transfer liquid from indented cells is demonstrated to show the potential of this surface modification method for gravure printing.

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Section: ■ Results and Discussionmentioning

confidence: 79%

Total Liquid Transfer with Enhanced Contact Line Slippage

You

Liao

2022

Langmuir

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“…The viscosities of formulated six different inks as a function of shear rates were measured to maintain the consistent ink transfer at the given printing speed of the R2R gravure system. [ 15 ] In general, since a shear rate significantly influences the behavior of ink transfer in the gravure‐printing unit, especially for non‐Newtonian, the viscosity varies depending on the gravure‐printing speed. [ 16 ] Thus, the printing speed should be matched with the ink viscosity to maintain printed devices with constant electrical characteristics.…”

Section: Resultsmentioning

confidence: 99%

A Roll‐to‐Roll Gravure‐Printing System for Manufacturing Near‐Field Energy‐Harvesting Labels

Shrestha,

Jung,

Park

et al. 2023

Advanced Intelligent Systems

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Billions of costless near‐field communication (NFC) sensor labels per day are demanded to practically enable edge computing between smartphones and everyday objects. However, to activate the billions of NFC sensor labels daily, providing an inexpensive manufacturing method for billions of wireless energy‐harvesting labels (WeHL) per day will become a decisive issue for realizing the practical applications. Herein, a roll‐to‐roll (R2R) gravure, a typical high‐throughput additive manufacturing method, is explored to print WeHLs where six diodes and six capacitors are integrated. To meet the high‐throughput manufacturing speed (90 mm s−1) of the R2R gravure system, six different electronic inks are formulated to print the WeHLs to harvest ±10 V from the smartphone's NFC carrier. To attain a practical device yield under the given printing speed, the web tension, nip force, doctor blade angle, and overlay printing registration accuracy are well controlled and optimized to print six different layers within a high overlay printing accuracy, while printing patterns to connect two electrodes with a height difference greater than 3 μm. The fully R2R‐printed WeHLs can successfully harvest energy from the smartphone's NFC carrier with the conversion efficiency of 50%.

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“…Scholars all over the world have paid much attention to flexographic printing and have deeply studied various aspects of flexographic printing technology [4][5][6][7]. In view of the complexity and difficulty of the printing mechanism of non-absorbent substrates in gravure printing, Wu Shuang, Dong Ling, Guan Xiaomin, and Zhu Hongjuan have made a preliminary study on the transfer and drying of gravure water-based ink [8][9][10][11]. The research results provide a way to solve the problem of gravure flexo printing on a non-absorbent substrate.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation on Ink Transfer Channel of Flexography Based on Fluid–Solid-Heat Interactions

Zhu,

Xing,

Zhu

2024

Processes

Self Cite

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Flexographic printing is widely used in the packaging field, but there are still some problems in the printing of flexographic ink on non-absorbent substrates, such as low precision and unstable quality. In this paper, the printing process of flexographic ink is simulated. The interaction of fluid flow, temperature change, and solid deformation in flexographic printing is studied systematically by using the method of fluid–solid thermal coupling for the first time. The process of ink channel formation under static extrusion and fluid–solid thermal coupling was analyzed. The influences of printing pressure, printing speed, ink layer thickness, and ink viscosity on the ink channel were explored. The results show that the printing speed increases and the temperature in the stamping area increases. The printing speed is nonlinear related to the ink flow channel, the influence on the channel is slow at a low speed, the channel increases sharply at a medium and high speed, and tends to be stable at a high speed. When the printing speed is 200 m/min, the ink temperature in the stamping area is 1.5 °C higher than that at the entrance. With an increase in printing pressure, the ink flow channel width showed a trend of decreasing first and then stabilizing, and the pressure was about 0.4 MPa, showing a small fluctuation; the greater the pressure, the higher the temperature of the ink, which will change the performance of the ink and plate, causing adverse effects on the printing belt. The channel width showed obvious nonlinear characteristics with an increase and decrease in ink thickness. When the ink thickness is 30 μm, the deformation of the plate reaches the maximum, and the width of the ink circulation channel is correspondingly the widest. The change in ink viscosity has little influence on the stability of the ink’s internal flow rate and temperature field. The research results provide theoretical support for the transfer of ink printing from gravure to flexo printing.

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

Cited by 5 publications

References 44 publications

Total Liquid Transfer with Enhanced Contact Line Slippage

Total Liquid Transfer with Enhanced Contact Line Slippage

A Roll‐to‐Roll Gravure‐Printing System for Manufacturing Near‐Field Energy‐Harvesting Labels

Numerical Simulation on Ink Transfer Channel of Flexography Based on Fluid–Solid-Heat Interactions

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