Simulation of non-Newtonian ink transfer between two separating plates for gravure-offset printing

Ahmed, Dewan Hasan; Sung, Hyung Jin; Kim, Dong-Soo

doi:10.1016/j.ijheatfluidflow.2010.06.011

Cited by 43 publications

(33 citation statements)

References 17 publications

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“…As time passes, a portion of ink becomes attached to the flat plate and after breakup a small satellite droplet appears for all groove depths. Note that Huang et al (2008) and Ahmed et al (2010) observed more than a single satellite droplet in their studies due to non-Newtonian shear thinning effects during the transfer of ink to the top plate. The results of the present study are different due to the different coefficient used in the Carreau model.…”

Section: Effects Of Varying the Groove Depthmentioning

confidence: 93%

“…Previous numerical studies can be classified into three groups. The first group of studies are 2D or 3D simulations of ink transfer between two parallel plates with vertical detaching for offset (Darhuber et al, 2001;Ahmed et al, 2010) and of ink transfer between one plate and cavity with vertical or horizontal detaching for gravure and rotogravure printing by changing the groove geometry (Hoda and Kumar, 2008), e.g., symmetric trapezoidal (Schwartz, 2002) and non-symmetric (Ahn et al, 2008a). The second groups of studies are concerned with the effects of ink rheology and the dynamics of ink transfer (Huang et al, 2008;Ahn et al, 2008b).…”

Section: Introductionmentioning

confidence: 99%

“…Although these numerical simulations examined the effects of varying parameters, such as the ink viscosity, surface tension, groove shape, blanket and substrate surface characteristics, and plate detaching velocity, on the ink transfer ratio, none of them considered actual inks or the actual rheology of conductive ink behavior. Our research group has previously studied the ink transfer behavior of Newtonian fluids (Huang et al, 2008) and non-Newtonian fluids (Ahmed et al, 2010). Ahmed et al (2010) considered the ink transfer between two parallel plates (the third step of the ink transfer process) by using the Carreau model and investigated the parameters that have the strongest influence on the ink transfer process.…”

Section: Introductionmentioning

confidence: 99%

“…Our research group has previously studied the ink transfer behavior of Newtonian fluids (Huang et al, 2008) and non-Newtonian fluids (Ahmed et al, 2010). Ahmed et al (2010) considered the ink transfer between two parallel plates (the third step of the ink transfer process) by using the Carreau model and investigated the parameters that have the strongest influence on the ink transfer process. However, the values of the various coefficients used in the Carreau model in that study were based on assumptions that do not apply to real inks.…”

Section: Introductionmentioning

confidence: 99%

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Non-Newtonian ink transfer in gravure–offset printing

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Section: Effects Of Varying the Groove Depthmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Non-Newtonian ink transfer in gravure–offset printing

Ghadiri

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Sung

et al. 2011

International Journal of Heat and Fluid Flow

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“…It is shown in [34,35,36,40,78,79,105,106], print anomalies can be detected and calculated to create a signature based on pixel distribution and satellite droplets. Similarly texture analysis of paper [41,47] investigates various qualities of the texture and roughness of surfaces relating to documents and banknotes, similarly [42] investigates the texture of the ink pattern.…”

Section: Trendsmentioning

confidence: 99%

Currency security and forensics: a survey

Chambers

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Garhwal

et al. 2014

Multimed Tools Appl

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Abstract-By its definition, the word 'currency' refers to an agreed medium for exchange, a nation's currency is the formal medium enforced by the elected governing entity. Throughout history, issuers have faced one common threat: counterfeiting. Despite technological advancements, overcoming counterfeit production remains a distant future. Scientific determination of authenticity requires a deep understanding of the raw materials and manufacturing processes involved. This survey serves as a synthesis of the current literature to understand the technology and the mechanics involved in currency manufacture and security, whilst identifying gaps in the current literature. Ultimately, a robust currency is desired.

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Water‐Soluble Hybrid Graphene Ink for Gravure‐Printed Planar Supercapacitors

Chang

Sai

et al. 2018

Adv Elect Materials

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efforts have been devoted to the design of graphene microstructures, most of graphene materials are difficult to be applied in all-solid-state planar supercapacitors because of their agglomerations due to the strong π-π interaction between the large basal planes and poor electrical conductivity in the fabricated microelectrodes. [13] This undesirable phenomenon significantly prevents the access of PVA-based gel electrolyte ions into the interplanar space, resulting in limited ion accessible surface area of graphene and sluggish ion transport kinetics so that there are lots of "dead surfaces" of graphene without contribution to the energy storage. [1] For reducing the graphene agglomerations, studies during the past few years were explored. Wu et al. used lithography to pattern reduced graphene oxide (RGO) microelectrodes for planar supercapacitors with areal capacitance around 0.32 mF cm −2 . [14] Meanwhile, Gao et al. directly used another laser writing to reduce graphene oxide (GO) paper and readily obtained a number of configurations for the RGO-based planar supercapacitors with an areal capacitance of 0.59 mF cm −2 . [15] El-Kady and Kaner further demonstrated a fabrication of graphene-based planar supercapacitors with an areal capacitance over 2.0 mF cm −2 by direct laser writing on graphite oxide films using a standard Light-Scribe DVD burner. [16] Although promising areal capacitances of graphene-based planar supercapacitors with fewer graphene agglomerations have been achieved by these microfabrication technologies, the global depositions of graphene material are usually required and patterned into interdigitated structures via etching or laser scribing, resulting in the complicated processing and wasting more graphene material.Selecting suitable microfabrication methods using proper graphene material is particularly crucial for enhancing the electrochemical performance of planar supercapacitors. As a powerful and cost efficient direct patterning method, printing technology attracts significant interest in graphene-based planar supercapacitors due to its simple processing and few material waste. [17][18][19] For example, Li et al., [13] Wang et al., [18] and Liu et al. [6] developed the full-inkjet-printing and screen printing for graphene-based planar supercapacitors. Although these two printing techniques provide the advantage of directly patterning the microelectrodes, to some extent, they usually face the risk of the nozzle clogging and nonuniform pattern when needing high resolution feature. Fortunately, gravure printing as one Flexible printed all-solid-state graphene-based planar supercapacitors have attracted great attentions for their potential applications in portable and wearable electronics. However, the limited ion accessible surface area and slow ion diffusion rate lead to low specific capacitance and poor rate performance. Increasing the diffussion of polyvinyl alcohol (PVA)-based gel electrolyte into the printed graphene microelectrodes is a great challenge for improving its energy storage...

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Simulation of non-Newtonian ink transfer between two separating plates for gravure-offset printing

Cited by 43 publications

References 17 publications

Non-Newtonian ink transfer in gravure–offset printing

Non-Newtonian ink transfer in gravure–offset printing

Currency security and forensics: a survey

Water‐Soluble Hybrid Graphene Ink for Gravure‐Printed Planar Supercapacitors

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