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Article
Publication date: 24 January 2020

H. Abd El-Wahab, G. El-Meligi, M.G. Hassaan, A. Kazlauciunas and Long Lin

The purpose of this paper is to prepare, characterise and evaluate nano-emulsions of copolymers of various compositions as eco-friendly binders for flexographic ink industry.

Abstract

Purpose

The purpose of this paper is to prepare, characterise and evaluate nano-emulsions of copolymers of various compositions as eco-friendly binders for flexographic ink industry.

Design/methodology/approach

Various nano-emulsions of copolymers were prepared using styrene (St), butyl acrylate (BuAc), acrylic acid (AA) and acrylamide (AAm) monomers by means of a conventional seeded emulsion polymerisation technique, using K2S2O8 as the initiator. The characterisation of the prepared emulsions was performed using Fourier transform infrared (FT-IR), thermogravimetric analysis (TGA), gel permeation chromatography (GPC) and transmission electron microscopy (TEM). A selection of copolymers was formulated with pigments and additional ingredients, as water-based flexographic inks. The inks were characterised for their viscosity, pH, degree of dispersion, water resistance and colour density.

Findings

It was found that the low viscosity of the prepared copolymers may reduce the film thickness of the flexographic inks and may also increase the spreading of the ink on the surface. As a result, stable modified polyacrylate-based latex with improved physico-mechanical properties were obtained. The prepared latexes were showed improving and enhancing in water resistance; gloss values, and the print density that ranged from 2.06 to 2.51 and the maximum gloss values (39 and 48) were also obtained. Also, these binders provide excellent adhesion properties for both the pigment particles and the base paper.

Practical implications

This study focuses on the preparation of new water-based copolymer nanoparticles and their use as eco-friendly binders for flexographic ink industry.

Social implications

The ink formulations developed could find use in industrial-scale printing.

Originality/value

Eco-friendly environment ink formulations for printing on paper substrates are novel.

Details

Pigment & Resin Technology, vol. 49 no. 3
Type: Research Article
ISSN: 0369-9420

Keywords

Article
Publication date: 13 May 2020

H. Abd El-Wahab, G.A. Meligi, M.G. Hassaan and L. Lin

The purpose of this study is to prepare, characterise and evaluate nano-emulsions of ter-polymers of various compositions as eco-friendly binders for flexographic ink industry.

Abstract

Purpose

The purpose of this study is to prepare, characterise and evaluate nano-emulsions of ter-polymers of various compositions as eco-friendly binders for flexographic ink industry.

Design/methodology/approach

Various nano-emulsions of ter-polymers were prepared based on Vinyl acetate, Vinyl Versatate, butyl acrylate, acrylic acid and acrylamide monomers by means of a conventional seeded emulsion polymerisation technique, using K2S2O8 as the initiator. The characterisation of the prepared emulsions was performed using Fourier transform infrared, thermo-gravimetric analysis, gel permeation chromatography and transmission electron microscopy. A selection of co-polymers and ter-polymers were formulated with pigments and additional ingredients, as water-based flexographic inks. The inks were characterised for their rheological properties, pH, degree of dispersion, water-resistance and colour density.

Findings

It was found that the low viscosity of the prepared polymers may reduce the film thickness of the flexographic inks and may also increase the spreading of the ink on the surface. As a result, stable modified poly acrylate-based latex with improved physico-mechanical properties was obtained. The prepared latexes showed improved properties such as enhanced thermal stability and better water resistance. The effect of the emulsifier type on the properties of the resulting emulsion latexes and their corresponding films were investigated. Also, as the hydrophobic monomer increases, so does the colour density and increasing the binder ratio enhances the gloss values. The improving in gloss values were obtained and provide excellent adhesion properties for both the pigment particles and the base paper.

Research limitations/implications

The study focusses on the preparation of new water-based ter-polymer nano-particles and their use as eco-friendly binders for flexographic ink industry. Ink formulations based on other different type emulsion polymers could also be studied to assess the applicability of the ink formulation system found for other binders.

Practical implications

The ink formulations developed could find use in industrial-scale printing.

Originality/value

Eco-friendly environment and low-cost ink formulations for printing on paper substrates are novel.

Details

Pigment & Resin Technology, vol. 49 no. 6
Type: Research Article
ISSN: 0369-9420

Keywords

Article
Publication date: 1 April 1979

C.A. Smith

Printing inks fall into two more or less distinct rheological classes—highly viscous inks formulated for letterpress, offset, and typographical printing versus relatively…

Abstract

Printing inks fall into two more or less distinct rheological classes—highly viscous inks formulated for letterpress, offset, and typographical printing versus relatively fluid inks formulated for flexographic and rotogravure printing.

Details

Pigment & Resin Technology, vol. 8 no. 4
Type: Research Article
ISSN: 0369-9420

Article
Publication date: 1 November 1978

G.H. Hutchinson

The trend towards a greater use of water as the solvent in flexographic and gravure printing inks has been influenced by a number of factors — the growing attention to…

Abstract

The trend towards a greater use of water as the solvent in flexographic and gravure printing inks has been influenced by a number of factors — the growing attention to environmental pollution problems, health and safety aspects, elimination of residual print odour in food packaging printing and conservation of organic solvents.

Details

Pigment & Resin Technology, vol. 7 no. 11
Type: Research Article
ISSN: 0369-9420

Article
Publication date: 1 March 1986

Tony Smith

The adaptability of the flexographic printing process to cater for the ever widening range of base surfaces on which print is applied has presented a considerable…

Abstract

The adaptability of the flexographic printing process to cater for the ever widening range of base surfaces on which print is applied has presented a considerable challenge to ink technologists in recent years.

Details

Pigment & Resin Technology, vol. 15 no. 3
Type: Research Article
ISSN: 0369-9420

Article
Publication date: 1 October 2004

D.J. Galton

Commercial pressure has forced improvements in the reduction of press down time. One restraining factor for the flexographic printing process has been the lack of…

Abstract

Commercial pressure has forced improvements in the reduction of press down time. One restraining factor for the flexographic printing process has been the lack of predictability and consistency. The results of a factorial designed experiment, are reported in this paper. Investigations into the complex interactions of many variable factors that take place during the printing process were carried out. Various statistical methods were employed for the design of the experiment and for the interpretation of experimental data generated. The results of the investigation have been used to optimise the flexographic printing techniques to significantly manipulate the properties of various production components for the end‐use application to enhance the plates printing performance and consistency.

Details

Pigment & Resin Technology, vol. 33 no. 5
Type: Research Article
ISSN: 0369-9420

Keywords

Article
Publication date: 20 April 2022

Walaa M. Abd El-Gawad and Wael Mohamed Abdelmaksoud

This study aims to investigate the possibility of synthesizing cobalt doped willemite ceramic blue pigment by using Egyptian white sand as environmental and economical raw…

Abstract

Purpose

This study aims to investigate the possibility of synthesizing cobalt doped willemite ceramic blue pigment by using Egyptian white sand as environmental and economical raw material for multi-applications in coatings and inks.

Design/methodology/approach

After the synthesis process, the prepared blue pigment was characterized via X-ray diffraction, scanning electron microscopy and energy-dispersive X-ray analysis technique. Then the blue pigment was integrated into both coating and ink formulations. The effect of the prepared multifunctional coatings on corrosion resistance and thermal stability was evaluated using different standard tests. Also, the effect of inclusion of blue pigment in flexographic printing ink formulation was done.

Findings

The results showed that the coating containing the cobalt doped willemite blue pigment offered good anticorrosive performance and high thermal stability. Additionally, the presented results revealed that integration of the blue pigment in flexographic printing ink formulation enhanced fineness, gloss, viscosity and color more than the commercial one “FX 430–201.”

Originality/value

In conclusion, relied on the eco-friendly principle which can be regarded as an economic and green strategy, it can be obtained that this new pigment can provide good multifunctions such as corrosion resistance and thermal stability in coatings and good fineness, gloss, viscosity and color in inks which can enable them to be widely applied in different industries.

Details

Pigment & Resin Technology, vol. ahead-of-print no. ahead-of-print
Type: Research Article
ISSN: 0369-9420

Keywords

Article
Publication date: 5 May 2015

Jagdeep S. Sagu, Nicola York, Darren Southee and K.G.U. Wijayantha

The purpose of this paper is to report on the feasibility of the manufacture of printed rechargeable power sources incorporating, in the first instance, electrode…

Abstract

Purpose

The purpose of this paper is to report on the feasibility of the manufacture of printed rechargeable power sources incorporating, in the first instance, electrode structures from the previous study, and moving on to improved electrode structures fabricated, via flexographic printing, using commercially available inks. It has been shown previously that offset lithography, a common printing technique, can be used to make electrodes for energy storage devices such as primary cells.

Design/methodology/approach

A pair of the original Ag/C electrodes, printed via offset lithography, were sandwiched together with a PVA-KOH gel electrolyte and then sealed. The resultant structures were characterised using electrochemical techniques and the performance as supercapacitors assessed. Following these studies, electrode structures of the same dimensions, consisting of two layers, a silver-based current collector covered with a high surface area carbon layer, were printed flexographically, using inks, on a melinex substrate. The characterisation and assessment of these structures, as supercapacitors, was determined.

Findings

It was found that the supercapacitors constructed using the offset lithographic electrodes exhibited a capacitance of 0.72 mF/cm2 and had an equivalent series resistance of 3.96 Ω. The structures fabricated via flexography exhibited a capacitance of 4 mF/cm2 and had an equivalent series resistance of 1.25 Ω The supercapacitor structures were subjected to bending and rolling tests to determine device performance under deformation and stress. It was found that supercapacitor performance was not significantly reduced by bending or rolling.

Originality/value

This paper provides insight into the use of printed silver/carbon electrodes within supercapacitor structures and compares the performance of devices fabricated using inks for offset lithographic printing presses and those made using commercially available inks for flexographic printing. The potential viability of such structures for low-end and cheap energy storage devices is demonstrated.

Details

Circuit World, vol. 41 no. 2
Type: Research Article
ISSN: 0305-6120

Keywords

Article
Publication date: 1 February 1983

H. Rök

Producers of printing inks are undoubtedly more experienced in the formulation of packaging and speciality printing inks than we are. Nevertheless we have chosen the topic…

Abstract

Producers of printing inks are undoubtedly more experienced in the formulation of packaging and speciality printing inks than we are. Nevertheless we have chosen the topic of “Pigments for packaging and speciality printing” because we believe that only through close co‐operation with the printing ink manufacturer can we, the pigment producer, continue to supply product advancements that will meet present and future pigment needs.

Details

Pigment & Resin Technology, vol. 12 no. 2
Type: Research Article
ISSN: 0369-9420

Article
Publication date: 1 April 1997

Bryan Hancock

Considers the four phases in the life of printing ink ‐ manufacture, processing, usage in printed form and disposal ‐ in relation to health and safety aspects of ink use…

981

Abstract

Considers the four phases in the life of printing ink ‐ manufacture, processing, usage in printed form and disposal ‐ in relation to health and safety aspects of ink use on food packaging. Examines the effects of legislation on the printing ink manufacturer.

Details

Pigment & Resin Technology, vol. 26 no. 2
Type: Research Article
ISSN: 0369-9420

Keywords

1 – 10 of 172