Investigation on electrostatic assist and gravure process parameters on solid mottle reduction for shrink films

Joshi, Akshay; Dettke, Christoph; Steingraeber, Joseph

doi:10.1007/s11998-015-9753-5

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…It is a rotary printing method in which the printing plate is the central component transferring the printing ink directly onto the printing substrate. In addition to flexography, there are other conventional printing techniques that can be used for deposition of different types of films and coatings, such as screen printing and gravure printing [10][11][12][13]. The advantage of flexographic printing is the ability to print on different types of substrates and the formation of a printed film of certain properties.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Common Solvents on UV-Modified Photopolymer and EPDM Flexographic Printing Plates and Printed Ink Films

et al. 2020

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The aim of this research was to analyze the influence of the solvents commonly used in flexography on photopolymer and ethylene propylene diene monomer (EPDM) flexographic printing plates and prints. EPDM plates are recommended when the reproduction process includes a higher amount of the solvents or aggressive solvents. Since additional UV treatment of flexographic printing plates could decrease the interaction between the plate and solvent, photopolymer and EPDM plates were treated with varied UV radiation and exposed to different types of solvents. Effects of the UV treatment and of the solvents on printing plate properties and on prints were analyzed. Results show that EPDM plates are more resistant to solvents in terms of the degree of swelling; however, surface properties of the plates were affected for both plate materials. In addition, the degree of swelling and increased hardness due to UV radiation were crucial for changes of the width of printed lines, and altered surface free energy affected the thickness of deposited ink film for both plate materials. Therefore, depending on the qualitative requirements of specific printed film, the duration of UV treatment can be adjusted for use with specific types of printing plate and solvent.

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Section: Introductionmentioning

confidence: 99%

Effect of the Common Solvents on UV-Modified Photopolymer and EPDM Flexographic Printing Plates and Printed Ink Films

et al. 2020

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“…However, it has been found that only 50% of the ink transfers to the substrate at high printing speeds. An electrostatic potential difference between the substrate and gravure roll is sometimes applied to improve ink transfer in traditional printing processes; − this method is known as electrostatic assist (ESA) (Figure a). However, the physical mechanisms underlying ESA remain a mystery.…”

Section: Introductionmentioning

confidence: 99%

Electrostatic Assist of Liquid Transfer between Flat Surfaces

Huang

Kumar

2018

Langmuir

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Transfer of liquid from one surface to another plays a vital role in printing processes. During liquid transfer, a liquid bridge is formed and subjected to substantial extension but incomplete liquid transfer can produce defects that are detrimental to the operation of printed electronic devices. One strategy for minimizing these defects is to apply an electric field, a technique known as electrostatic assist (ESA). However, the physical mechanisms underlying ESA remain a mystery. To better understand these mechanisms, slender-jet models are developed for both perfect dielectric and leaky dielectric axisymmetric Newtonian liquid bridges with moving contact lines. Nonlinear partial differential equations describing the evolution of the bridge radius and interfacial charge are derived and then solved using finite element methods. For perfect dielectrics, application of an electric field enhances liquid transfer to the more wettable surface over a wide range of capillary numbers. The electric field modifies the pressure differences inside the liquid bridge and, as a consequence, drives liquid toward the more wettable surface. For leaky dielectrics, charge can accumulate at the liquid-air interface. Application of an electric field can augment or oppose the influence of wettability differences, depending on the direction of the electric field and the sign of the surface charge. Flow visualization experiments reveal that when an electric field is applied, more liquid is transferred to the more wettable surface because of a modified bridge shape that causes depinning of the contact line. The measured values of the amount of liquid transferred are in good agreement with predictions of the perfect dielectric model.

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“…[6][7][8][9][10] Their utility is often highly dependent on their surface properties. [11][12][13] Specifically, SFE of polymers is an important feature for materials with applications of any type where surface interactions are of significance.…”

Section: Introductionmentioning

confidence: 99%

Tailoring the properties of deposited thin coating and print features in flexography by application of UV-ozone treatment

et al. 2016

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Printed functional materials are a rapidly growing area of interest for low-cost high-speed device manufacture with flexographic printing seen as a route to achieving this. The relationship between surface tension of the ink and surface free energy (SFE) of the photopolymer plate is a key for optimum performance. However, traditional methods of surface tension modification of the ink/coating often cannot be employed for functional inks. In this research, rapid, permanent modification of flexographic printing plate's SFE is achieved through controlled UV-ozone treatment, and the effects of the treatment on the polar and dispersive component of SFE are analyzed by Fourier transform infrared attenuated total reflectance spectroscopy, swelling experiments, and roughness measurements. Printing trials using the modified printing plates reveal improved print uniformity and control of deposited ink layer thickness, as well as improved print features-particularly track and pad junctions which can be problematic for printed electronic applications. The ability to rapidly tailor printing plate SFE is of benefit to all volume printing applications. Furthermore, it is of critical importance for functional printing and printed electronics where surface tension of the ink is determined by the functional material and chemical modification is not possible or desirable.

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Investigation on electrostatic assist and gravure process parameters on solid mottle reduction for shrink films

Cited by 5 publications

References 7 publications

Effect of the Common Solvents on UV-Modified Photopolymer and EPDM Flexographic Printing Plates and Printed Ink Films

Effect of the Common Solvents on UV-Modified Photopolymer and EPDM Flexographic Printing Plates and Printed Ink Films

Electrostatic Assist of Liquid Transfer between Flat Surfaces

Tailoring the properties of deposited thin coating and print features in flexography by application of UV-ozone treatment

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