20.500.12556/RUL-187662 Analiza svetlobne obstojnosti odtisov na kartonskih zloženkah Light Fastness Analysis on Folding Carton Packaging V magistrskem delu smo analizirali svetlobno obstojnost odtisov na kartonskih zloženkah barv za lase. Namen raziskave je bil ovrednotiti vpliv pigmentov, proizvajalca tiskarske barve in površinske lastnosti tiskovnega materiala na spremembe barve po izpostavitvi umetnemu staranju ter ugotoviti povezave med optičnimi, mehanskimi in površinskimi lastnostmi odtisov. Eksperimentalni del je obsegal analizo štirih potiskanih vzorcev različnih barv na dveh sorodnih tiskovnih materialih. Pred izpostavitvijo svetlobi smo določili osnovne in površinske lastnosti materialov, kot so debelina, hrapavost in poroznost, ter ocenili mehansko obstojnost odtisov na drgnjenje. Vzorci so bili nato izpostavljeni umetnemu staranju v komori s ksenonsko sijalko v časovnih intervalih 8, 16, 24 in 48 ur. Pred osvetlitvijo in med intervali smo izvedli spektrofotometrične meritve barvnih vrednosti ter izračunali barvne razlike. Vzorcem smo glede na rezultate tudi dodelili oceno svetlobne obstojnosti. Z uporabo vrstičnega elektronskega mikroskopa pa smo naredili analizo površine pred in po osvetljevanju. Rezultati so pokazali, da tiskovni material po izpostavitvi svetlobi porumeni, kar lahko vpliva na zaznavo barvnih sprememb odtisa. Med posameznimi vzorci so bile ugotovljene izrazite razlike v svetlobni obstojnosti. Največje spremembe so bile zaznane pri enem izmed bež vzorcev, medtem ko je drugi bež vzorec izkazal zelo visoko stabilnost. Oranžni in modri vzorec sta pokazala zmerno obstojnost. Ugotovili smo, da spremembe v površinski strukturi niso nujno neposredno povezane z barvnimi razlikami. Na podlagi rezultatov je bilo ugotovljeno, da na svetlobno obstojnost odtisov pomembno vplivajo tako lastnosti pigmentov kot tudi značilnosti tiskovnega materiala, pri čemer ima izbira proizvajalca pigmenta zelo pomembno vlogo. Rezultati potrjujejo kompleksnost obravnavanega problema ter nakazujejo potrebo po celostnem pristopu pri izbiri materialov za tisk embalaže. In the master’s thesis, we analysed the lightfastness of printed samples on folding carton packaging used for hair dyes. The aim of the research was to evaluate the influence of pigments, ink manufacturer, and surface properties of the printing substrate on colour changes after exposure to artificial aging, as well as to determine the relationships between optical, mechanical, and surface properties of the prints. The experimental part included the analysis of four printed samples of different colours on two related printing substrates. Before light exposure, we determined the basic and surface properties of the materials, such as thickness, roughness, and porosity, and evaluated the rubbing fastness of the prints. The samples were then subjected to artificial aging in a chamber with a xenon lamp at time intervals of 8, 16, 24, and 48 hours. Prior to exposure and during the intervals, spectrophotometric measurements of colour values were carried out, and colour differences were calculated. Based on the results, the samples were also assigned a lightfastness rating. Additionally, we analysed the surface before and after exposure using a scanning electron microscope. The results showed that the printing substrate yellows after exposure to light, which can affect the perception of colour changes in the print. Significant differences in lightfastness were observed among the individual samples. The largest changes were detected in one of the beige samples, while the other beige sample exhibited very high stability. The orange and blue samples showed moderate lightfastness. It was found that changes in surface structure are not necessarily directly related to colour differences. Based on the results, it was concluded that the lightfastness of prints is significantly influenced by both pigment properties and the characteristics of the printing substrate, with the choice of pigment manufacturer playing a very important role. The results confirm the complexity of the studied problem and indicate the need for a comprehensive approach when selecting materials for packaging printing. svetlobna obstojnost embalaža pigmenti fotodegradacija barvne razlike lightfastness packaging pigments photodegradation colour difference true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2026-09-12 09:01:07 2026-09-12 09:01:10 2026-09-15 03:37:43 0000-00-00 00:00:00 2026 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1970-01-01 116550 29506.pdf 29506.pdf 1 7BA23404537C296FF98C252B82DEC3FD 2013f02e9c21b68f5049d92f436213185cff5f1a9a3c98084461e084a89d6d5e b6d59bba-ae77-11f1-8bc5-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=247364 Naravoslovnotehniška fakulteta 0 0 0