Naslov
Colour changes of UV-curable thermochromic inks

Autori
Kulčar, Rahela ; Friškovec, Mojca ; Knešaurek, Nina ; Sušin, Barbara ; Klanjšek Gunde, Marta

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the 36th International Research Conference of iarigai "Advanced in Printing and Media Technology" / Enlund, Nils ; Lovreček, Mladen - Darmstadt, 2009, 429-434

ISBN
978-3-9812704-1-0

Skup
International Research Conference of iarigai "Advanced in Printing and Media Technology" (36 ; 2009)

Mjesto i datum
Stockholm, Švedska, 13.09.2009. - 16.09.2009

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

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.

Izvorni jezik
Engleski

Znanstvena područja
Grafička tehnologija

POVEZANOST RADA