Classification and analyses of coating flows

The printing of ceramic substrates by offset gravure is well established industrially and is a potentially viable method for printing circuitry. Modified inks are required to be able to print fine lines at high resolution with minimal displacement and distortion. In the present study a statistical assessment of the role of the components of the ink binder has been undertaken, the inks being evaluated by printing tests and in terms of their rheology and cohesion. The results have been examined using a factor design program and the best-fit multivariate model established in order to describe the response to each factor. Based on the models, it was possible to increase the internal cohesion of the inks which gave a decrease in the rheological phase angle and an increase in print mass. It was found practicable to print lines as fine as 9 µm wide and dots as small as 20 µm diameter on ceramic substrates. 20040305_j11403.pmd 5/25/2004, 9:29 AM 119 120 © Color. Technol., 120 (2004) Web ref: 20040305

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“…Picture by transmitted light (860 × 660 µm) of the ceramic substrate with dried ceramic ink dot (20 µm) and lines (9,9,13,13,18 and 18 µm)…”

Section: Figure 12mentioning

confidence: 99%

“…In practice the actual time-dependent solvent concentration and apparent viscosity may however be more significant than the values given by the rheometer. In earlier studies using low viscosity inks, the capillary number and the Reynolds number in printing have been evaluated [9].…”

Section: Introductionmentioning

confidence: 99%

Methods for the evaluation of fine‐line offset gravure printing inks for ceramics

Pudas

Hagberg

Leppävuori

et al. 2004

Coloration Technology

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“…Further numerous topics in applied engineering science are noted by Karapantsios et al [3], Benkreira et al [4], and Wilhelmsson et al [5]. In industry the low liquid volume fractions (1-5%) are very important, especially in the pharmaceutical industry in which the coating provides a sustained release barrier for drug transport.…”

Section: Introductionmentioning

confidence: 97%

Characterization of patterns in rimming flow

Chicharro

Vázquez

Manasseh

2011

Experimental Thermal and Fluid Science

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“…In the large field of coating techniques, see e.g. [8][9][10], especially where thin liquid films are forced to spread over solid substrates, they are of a great importance. Flows of this type are found, e.g., in the manufacturing of electronic devices.…”

Section: Introductionmentioning

confidence: 99%

Drag reduction and improvement of material transport in creeping films

2005

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It is widely accepted that for bodies in turbulent flows a reduction of skin friction can be reached if the surface of the body is provided with small ridges aligned in the local flow direction. This surprising and counterintuitive phenomenon is called the shark-skin effect, motivated from the dermal surface morphology of sharks. In the present article we examine the possibility of resistance reduction due to a rippled surface topography in Stokes flow. We especially analyse the influence of wall riblets perpendicular to the flow direction on the mean transport velocity in gravity-driven creeping film flows following the idea that eddies generated in the valleys of the riblets act like fluid roller bearings and hence may reduce drag. Using a theoretical treatment of the Stokes equations with complex function theory, parameter studies with varying flow rate, bottom amplitude and bottom shape are presented. For the given bottom shapes the maximum enhancement of transport velocity is found by optimising the film thickness.

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Classification and analyses of coating flows

Cited by 33 publications

References 29 publications

Methods for the evaluation of fine‐line offset gravure printing inks for ceramics

Methods for the evaluation of fine‐line offset gravure printing inks for ceramics

Characterization of patterns in rimming flow

Drag reduction and improvement of material transport in creeping films

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