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Ink tack stability readings of the offset thermochromic inks

Dominik Kapović (Faculty of Graphic Arts, Universtiy of Zagreb, Zagreb, Croatia)
Mirela Rožić (Faculty of Graphic Arts, Universtiy of Zagreb, Zagreb, Croatia)
Marina Vukoje (Faculty of Graphic Arts, Universtiy of Zagreb, Zagreb, Croatia)
Branka Lozo (Faculty of Graphic Arts, Universtiy of Zagreb, Zagreb, Croatia)

Pigment & Resin Technology

ISSN: 0369-9420

Article publication date: 30 May 2019

Issue publication date: 5 July 2019

Abstract

Purpose

This paper aims to analyse the tack stability measurement readings of thermochromic offset inks. For this purpose, three reversible leuco-dye formed thermochromic inks were used to evaluate their tack. The used inks differ in their activation temperature, colour, drying mechanism, viscosity and chemical content. Thermochromic offset inks differ from conventional inks in formulation and size of colourants due to the presence of the microcapsules.

Design/methodology/approach

Printing inks in offset lithography must have sufficient tack so they can be transported from a reservoir onto the substrate. The ink transfer takes place through the ink splitting by inking rollers, printing plate and blanket transport. An IGT Tackoscope device was used to produce the dynamic readings of ink tack as a function of distribution and splitting time. The data can be used for prediction of the ink press stability under controlled settings, such as temperature.

Findings

This research explains the temperature and velocity influence on the tack stability measurement readings of thermochromic inks. It also gives an insight of the chemical compounds that dictate the tack measuring reading results.

Originality/value

Development of new printing inks, such as thermochromic printing inks, may affect the printing of different products. The research was conducted due to a lack of available data for the tack of thermochromic inks.

Keywords

Acknowledgements

The authors are grateful for the support from IGT Testing Systems, Almere, The Netherlands, for providing the measuring equipment.

Citation

Kapović, D., Rožić, M., Vukoje, M. and Lozo, B. (2019), "Ink tack stability readings of the offset thermochromic inks", Pigment & Resin Technology, Vol. 48 No. 4, pp. 309-316. https://doi.org/10.1108/PRT-07-2018-0064

Publisher

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Emerald Publishing Limited

Copyright © 2019, Emerald Publishing Limited