Penava, Ivan (2020) Karakteristike i stabilnosti fleksografskih termokromnih boja za tisak na naljepnice. Master's thesis - Graduate Programme. Grafički fakultet. [Mentor: Bolanča Mirković, Ivana].
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Abstract
Tematika ovog diplomskog rada temelji se na termokromnim bojama i njihovoj kemijskoj stabilnosti. Termokrone tiskarske boje sve se više koriste za različite aplikacije zbog svoje funkcionalne karakteristike koja daje proizvodu jednu dodatnu vrijednost a koriste se u raznim industrijama od medicinske i prehrambene te u komercijalne svrhe. Termokromne boje se sastoje od termokromnih pigmenata koji su raspršeni u vezivu, te se termokromni efekt postiže kombinacijom dviju termokromnih boja različitih aktivacijskih temperatura ili kombinacijom termokromnih boja sa konvencionalnim tiskarskim bojama. Međutim, na dinamičku promjenu termokromne boje nepovoljno utječe izloženost vanjskim utjecajima poput UV zračenja te nekih ekstremnih okoliša poput lužina i kiselina, nakon čega dolazi do smanjenja termokromnog efekta ili čak njegovog potpunog gubitka. Jedan od ključnih faktora stabilnosti termokromnih boja je podloga na koju su otisnute, gdje određene podloge (hrapavije) mogu bolje očuvati mikrokapsule koje sadrže pigment, te se na taj način termokromni efekt bolje čuva. Rad je podijeljen u dva dijela. U prvom dijelu ispitivati će se fleksotiskarske termokromne boje, njihovo miješanje sa konvencionalnim bojama te utjecaj više slojeva termorkomnih boja na termokromni efekt, dok drugi dio eksperimentalnog dijela rada obuhvaća kemijsku stabilnost termokromnih boja prema ISO standardu. Za ispitivanje će se koristiti tiskarske podloge (papiri) koje služe kao naljepnice, a svi uzorci će biti spektrofotometrijski mjereni prije i poslije testa, a dobiveni uzorci uspoređivani.
| Item Type: | Master's thesis - Graduate Programme |
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| Mentor name: | Bolanča Mirković, Ivana |
| Thesis Committee: | Kulčar, Rahela and Bolanča Mirković, Ivana and Banić, Dubravko |
| Defence date: | 17 July 2020 |
| Abstract in english: | The topic of this thesis is based on thermochromic inks and their chemical stability. Thermochromic printing inks are increasingly used for various different applications due to their functional characteristics that give the product an added value and are used in various industries from medical to food and for commercial purposes. Thermochromic inks consist of thermochromic pigments dispersed in binder, and thermochromic effect is achieved by combining two thermochromic inks with different activation temperatures, or by combining thermochromic inks with conventional printing inks. However, the dynamic change of thermochromic inks is affected negatively by external factors, such as UV radiation and some extreme enviorments like acids and alkalis, where color range could be reduced or thermochromic effect could be lost. One of the key factors of thermochromic inks stability is the printing substrate, where some substrates (rough ones) can preserve microcapsules containing pigment better than smooth substrates. The paper is divided in two parts. The first part will examineflexographic thermochromic printing inks, their mixing with conventional printing inks, and the influence of multiple layers of thermochromic inks on thermochromic effect, while the second part of the experimental part covers the chemical stability of thermochromic inks according to ISO standard. The test will use papers that serve as labels, and all samples will be spectrophotometrically measured before and after the test, and given results compared. |
| Uncontrolled Keywords: | fleksografski tisak, termokromne boje, naljepnica, kemijska stabilnost |
| Keywords in english: | flexographic print, thermochromic inks, labels, chemical stability |
| Subjects: | TECHNICAL SCIENCES > Graphic Technology |
| Institution: | Grafički fakultet |
| City: | Zagreb |
| Number of Pages: | 62 |
| Callnumber: | BOL 2020 PEN |
| Inventory number: | DB879 |
| Depositing User: | Nina Jelača |
| Status: | Unpublished |
| Date Deposited: | 10 Dec 2020 09:31 |
| Last Modified: | 10 Dec 2020 09:31 |
| URI: | http://eprints.grf.unizg.hr/id/eprint/3264 |
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