Marče, Andrea (2021) Interakcija biorazgradivog premaza i tiskarske boje za sitotisak. Master's thesis - Graduate Programme. Grafički fakultet. [Mentor: Tomašegović, Tamara].
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Abstract
Površinske pojave u tisku izuzetno su važne za razumijevanje i optimizaciju interakcije materijala koji sudjeluju u procesu grafičke reprodukcije. U tehnici sitotiska, površinska svojstva otiska između ostalog su vezana uz odabir mrežice na tiskovnoj formi, budući da hrapava površina otiska nastala zbog same strukture mrežice može značajno utjecati na slobodnu površinsku energiju otisnutog sloja tiskarske boje. U svrhu zaštite poroznih tiskovnih podloga od prodora vlage, ojačanja mehaničkih svojstava ili osiguranja boljeg prihvaćanja tiskarske boje na podlogu, podloge se često prije tiska premazuju zaštitnim premazima. Tada parametri adhezije između premaza i tiskarske boje postaju od izuzetnog značaja za procjenu izdržljivosti, ali i kvalitete otiska. U ovom radu korišteni su biorazgradivi premazi (polikaprolakton i polilaktična kiselina) koji su naneseni na papirnu podlogu u svrhu smanjenja propusnosti na vodenu paru. Zatim su na podlogu otisnuti kontrolni motivi pomoću dvije vrste sitotiskarskih boja na bazi vode: boja s transparentnom bijelom, i boja s pokrivnom bijelom. Prije otiskivanja, eksperimentalno je određena optimalna linijatura sitotiskarske mrežice za odabrane motive. Analizom površinskih i međupovršinskih svojstava u sustavu „tiskovna podloga-premazotisak“ te mjerenjima svojstava površine otiska kao što su hrapavost i vizualne analize 2D i 3D mikroskopijom bit će moguće opisati i optimizirati interakciju biorazgradivog premaza i tiskarskih boja za sitotisak.
| Item Type: | Master's thesis - Graduate Programme |
|---|---|
| Mentor name: | Tomašegović, Tamara |
| Thesis Committee: | Mahović Poljaček, Sanja and Tomašegović, Tamara and Itrić Ivanda, Katarina |
| Defence date: | 24 September 2021 |
| Abstract in english: | Surface phenomena in print are extremely important for understanding and optimizing the interaction of materials involved in the graphic reproduction process. In the screen printing technique, the surface properties of the print are, among other things, related to the selection of the mesh on the printing form, since the rough surface of the print due to the mesh structure itself can significantly affect the free surface energy of the printed ink layer. In order to protect porous printing substrates from moisture penetration, to strengthen mechanical properties or to ensure better adhesion of the printing ink to the substrate, the substrates are often coated with protective coatings before printing. Then the adhesion parameters between the coating and the printing ink become extremely important for assessing the durability, but also the quality of the print. In this work, biodegradable coatings (polycaprolactone and polylactic acid) were used, which were applied to a paper substrate in order to reduce the permeability to water vapor. Control motifs were then printed on the substrate using two types of water-based screen printing inks: ink with transparent white, and ink with cover white. Before printing, the optimal line of the screen printing grid for the selected motifs was experimentally determined. By analyzing the surface and interfacial properties in the system "printing substrate-coatingprint" and measuring the properties of the print surface such as roughness and visual analysis by 2D and 3D microscopy, it will be possible to describe and optimize the interaction of biodegradable coating and printing inks for screen printing. |
| Uncontrolled Keywords: | površinska svojstva otiska, slobodna površinska energija, tiskarska boja, zaštitni premazi, adhezija, polikaprolakton, polilaktična kiselina, propusnost na vodenu paru, hrapavost, 2D i 3D mikroskopija, biorazgradivi premazi |
| Keywords in english: | surface properties of the print, free surface energy, printing ink, protective coatings, adhesion, polycaprolactone, polylactic acid, water vapor permeability, roughness, 2D and 3D microscopy, biodegradable coatings |
| Subjects: | TECHNICAL SCIENCES > Graphic Technology |
| Institution: | Grafički fakultet |
| City: | Zagreb |
| Number of Pages: | 44 |
| Callnumber: | TOM 2021 MAR |
| Inventory number: | DB1010 |
| Depositing User: | Nina Jelača |
| Status: | Unpublished |
| Date Deposited: | 11 Dec 2023 12:18 |
| Last Modified: | 11 Dec 2023 12:18 |
| URI: | http://eprints.grf.unizg.hr/id/eprint/3597 |
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