Interakcija biorazgradivog premaza i tiskarske boje za sitotisak

master's thesis

• Author: Andrea Marče
• Mentor: Tamara Tomašegović (mentor)
• Committee member: Sanja Mahović Poljaček (član povjerenstva)
• Committee member: Tamara Tomašegović (član povjerenstva)
• Committee member: Katarina Itrić Ivanda (član povjerenstva)
• Granter: University of Zagreb; Faculty of Graphic Arts; Zagreb
• Defense date and country: 2021-9-24, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Graphic Technology

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.

Abstract (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.

• 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 (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
• Language: croatian
• URN:NBN: urn:nbn:hr:216:864065
• Study programme: Title: Graphic technology; specializations in: Graphic technology, Design of graphic products; Course: Graphic technology; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra inženjer/inženjerka grafičke tehnologije (sveučilišni/a magistar/magistra inženjer/inženjerka grafičke tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-04-18 23:50:43