engleski

Thermochromic effect and adhesion parametres of liquid crystal-based printing ink on recycled printing substrates

The application of smart packaging in the fast-developing area of the products with added value has become an attractive field for science and industry. Considering the ecological and market requirements, new smart packaging products should possess both functionality and ecological features. In this research, thermochromic liquid crystal-based printing ink (TLC) was applied on the recycled black uncoated papers using screen printing, as well as on the pre-printed 100% recycled papers. The aim of the research was to analyze the thermochromic effect of the TLC printing ink on the recycled substrates and to analyze the adhesion parameters between all surfaces in the system. In addition, black flexographic printing ink was printed on non-black papers to enable the optimal thermochromic effect after TLC printing ink was screen printed. The adhesion parameters between papers, black flexographic printing ink, and TLC printing ink were calculated and analyzed. To evaluate the thermochromic effect of TLC printing ink, temperature dependent spectral reflectance was measured on all samples and colorimetric values were calculated. The results of the research provided the recommendation on applicability of certain non-black recycled papers as substrates for the thermochromic print after pre-printing with black flexographic printing ink.

Thermochromic liquid crystal-based printing ink, smart packaging, adhesion parameters, recycled paper

Izrada rada je financirana iz potpore SuZ-a pod naslovom "Modifikacija i analiza funkcionalnih slojeva na različitim tiskovnim podlogama", voditeljice prof.dr.sc. Sanje Mahović Poljaček