Novi pristup razmatranju funkcionalnih svojstava otopina za vlaženje

master's thesis

• Author: Paula Yadranka Žitinski Elias
• Mentor: Miroslav Gojo (mentor)
• Committee member: Sanja Mahović Poljaček (član povjerenstva)
• Committee member: Željka Barbarić - Mikočević (član povjerenstva)
• Committee member: Miroslav Gojo (član povjerenstva)
• Granter: University of Zagreb; Faculty of Graphic Arts; Zagreb
• Defense date and country: 2010-9-27, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Graphic Technology

Abstract

Plošni tisak zasniva se na suprotnim površinskim svojstvima slobodnih i tiskovnih površina. Tijekom eksploatacije tiskovne forme odvijaju se mnogi procesi koji na razne načine utječu na površinu tiskovne forme, uzrokujući time opadanje njene kvalitete. Cilj ovog rada je promatranje utjecaja temperature na sposobnost močenja slobodnih površina. Porast temperature koje nastaje zbog trenja izmeĎu tiskovne forme, valjaka i ofsetnog cilindara u procesu otiskivanja utječe na proces adsorpcije otopine za vlaţenje na slobodnim površinama tiskovne forme, što izravno utječe na kvalitetu otiska. Rezultati ispitivanja pokazuju da se porastom temperature povećava slobodna površinska energija tiskovne forme. Nadalje, porast slobodne površinske energije uzrokuje i povećanje močenja otopine za vlaţenje. Istraţivanje je pokazalo značaj temperature i ukazalo da taj parametar ima veliki utjecaj na proces otiskivanja, odnosno kvalitetu konačnog proizvoda.

Abstract (english)

Offset printing is based on opposite surface properties of nonprinting and printing areas. Printing plates are during printing process influenced by many processes which in various ways affect the printing plate’s surface, causing degradation of its quality. The aim of this study was to detect changes of the wetting abilities of nonprinting areas when temperature is varied. The increase of temperature in the printing process, which is caused by friction between the printing plate, rollers and the offset cylinder, affects the adsorption process of dampening solution to the nonprinting areas of the printing plate, which directly affects the printing quality. Results show that temperature increase causes increase of the surface free energy of the printing plate’s nonprinting areas. Furthermore, the increase in surface free energy causes better adsorption of the dampening solution on nonprinting areas. Research has proven the importance of temperature and has shown that this parameter has significant impact on the printing process and, consequently, on the quality level of final product.

• Keywords: tiskovna forma; kontaktni kut; slobodna površinska energija; temperatura
• Keywords (english): printing plate; contact angle; surface free energy; temperature
• Language: croatian
• URN:NBN: urn:nbn:hr:216:024028
• 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 17:56:48