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Article

Properties and Colorimetric Performance of Screen-Printed Thermochromic/UV-Visible Fluorescent Hybrid Ink Systems

Faculty of Graphic Arts, University of Zagreb, 10 000 Zagreb, Croatia
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Authors to whom correspondence should be addressed.
Academic Editor: Valentina Belova
Appl. Sci. 2021, 11(23), 11414; https://doi.org/10.3390/app112311414
Received: 25 October 2021 / Revised: 25 November 2021 / Accepted: 30 November 2021 / Published: 2 December 2021
(This article belongs to the Special Issue Recent Advances in Application of Coatings and Films)
In the present research, properties and performance of special effect printing inks were observed with the aim of obtaining a printed product with dual functional properties. Thermochromic liquid crystal-based printing ink (TLC) and UV-visible (daylight invisible) fluorescent inks (UVF), pure and as hybrid ink systems, were printed using a screen-printing technique on two types of uncoated paper substrates. Characterization of the paper substrates was performed, as well as detailed analysis of printed layers. Thickness, surface roughness, surface free energy, and adhesion parameters of printed layers were analysed. Spectral reflectance of pure UVF and TLC printing inks, as well as the spectral reflectance of the proposed hybrid ink systems were measured. The thermochromic effect of the TLC ink and hybrid systems was analysed. Microscopy was used to display the visual colour play effect and the effect of the fluorescence. Results of the measurements showed high compatibility of used materials in the proposed hybrid ink systems. Since the effect of luminescence and the colour play effect in the hybrid systems were preserved, it can be concluded that TLC/UVF hybrid ink systems can find their application in the development of functional packaging and in all other applications with special requirements for temperature monitoring and hidden information for different products. View Full-Text
Keywords: thermochromic liquid crystal-based inks; UV-visible fluorescent ink; colour play effect; luminescence; screen printing thermochromic liquid crystal-based inks; UV-visible fluorescent ink; colour play effect; luminescence; screen printing
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MDPI and ACS Style

Tomašegović, T.; Mahović Poljaček, S.; Strižić Jakovljević, M.; Marošević Dolovski, A. Properties and Colorimetric Performance of Screen-Printed Thermochromic/UV-Visible Fluorescent Hybrid Ink Systems. Appl. Sci. 2021, 11, 11414. https://doi.org/10.3390/app112311414

AMA Style

Tomašegović T, Mahović Poljaček S, Strižić Jakovljević M, Marošević Dolovski A. Properties and Colorimetric Performance of Screen-Printed Thermochromic/UV-Visible Fluorescent Hybrid Ink Systems. Applied Sciences. 2021; 11(23):11414. https://doi.org/10.3390/app112311414

Chicago/Turabian Style

Tomašegović, Tamara, Sanja Mahović Poljaček, Maja Strižić Jakovljević, and Ana Marošević Dolovski. 2021. "Properties and Colorimetric Performance of Screen-Printed Thermochromic/UV-Visible Fluorescent Hybrid Ink Systems" Applied Sciences 11, no. 23: 11414. https://doi.org/10.3390/app112311414

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