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Acta graphica : journal for printing science and graphic communications, Vol.23 No.1-2 July 2012. -

Thermochromic printing inks change their colour regarding the change in temperature

and they are one of the major groups of colour-changing inks. One of the

most frequently used thermochromic material in printing inks are leuco dyes. The

colour of thermochromic prints is dynamic, it is not just temperature-dependent,

but it also depends on thermal history. The effect is described by colour hysteresis.

This paper aims at discussing general aspects of thermochromic inks, dynamic

colorimetric properties of leuco dye-based thermochromic inks, their stability and

principle of variable-temperature colour measurement. Thermochromic material

is protected in round-shaped capsules. They are much larger than pigments in conventional

inks. The polymer envelopes of pigment capsules are more stable against

oxidation than the binder. If these envelopes are damaged, the dynamic colour is

irreversibly lost. Our aim is to analyse the colorimetric properties of several reversible

screen-printed UV-curing leuco dye thermochromic inks with different activation

temperatures printed on paper. A small analysis of irreversible thermochromic

inks will be presented for comparison with reversible thermochromic inks.

Moreover, so as to show interesting possibilities, a combination of different inks

was made, an irreversible thermochromic ink was printed on top of the red and

blue reversible thermochromic inks. Special attention was given to the characterization

of colour hysteresis and the meaning of activation temperature.

Thermochromic inks; colour hysteresis; pigment capsules; variable-temperature colour measurement

Autor: Rahela Kulčar - orcid.org-0000-0003-3599-9806 ; Faculty of Graphic Arts, University of Zagreb, Croatia Marta Klanjšeg Gunde - ;

Fuente: http://hrcak.srce.hr/


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