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Autori: Kulčar, Rahela; Friškovec, Mojca; Knešaurek, Nina; Sušin, Barbara; Klanjšek Gunde, Marta
Naslov: Colour changes of UV-curable thermochromic inks
Izvornik: Proceedings of the 36th International Research Conference of iarigai "Advanced in Printing and Media Technology" / Enlund, Nils ; Lovreček, Mladen (ur.). - Darmstadt :
Skup: International Research Conference of iarigai "Advanced in Printing and Media Technology" (36 ; 2009)
Mjesto i datum: Stockholm, Švedska, 13.-16.09.2009.
Ključne riječi: thermochromic inks; UV curing; screen printing; colorimetry; dynamic colour; hysteresis
Sažetak:
UV-curable leucodye-based thermochromic inks with activation temperature of 31 °C in blue, red and black shades were analysed. The colour of samples does not depend only on their temperature but also on thermal history – they show colour hysteresis. Similar hysteresis loops were obtained for the red and blue samples and narrower for the black sample, as measured by cycling in 14–40–14 °C region. The blue and black samples have approximately closed loops but a small colour difference was obtained even after one cycle for the red one thus the loop remains slightly opened. The colour of all samples also depends on the UV dose applied at curing. This difference was followed over the whole hysteresis loop. The largest values were measured for the red sample where the CIEDE2000 total colour difference rises above 4 and remains well observable all over the temperature region applied for cycling. One of the possible reasons for this effect might be different degree of polymerisation of the polymer matrix achieved by different UV curing.
Vrsta sudjelovanja: Predavanje
Vrsta prezentacije u zborniku: Ostalo
Vrsta recenzije: Međunarodna recenzija
Projekt / tema: 128-0000000-3288
Izvorni jezik: ENG
Kategorija: Znanstveni
Znanstvena područja:
Grafička tehnologija
Upisao u CROSBI: rkulcar@grf.hr (rkulcar@grf.hr), 24. Vel. 2010. u 13:57 sati



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