Utjecaj naklade u novinskoj rotaciji na proces vlaženja

master's thesis

• Author: Jelena Duvančić
• Mentor: Miroslav Gojo (mentor)
• Committee member: Miroslav Gojo (član povjerenstva)
• Granter: University of Zagreb; Faculty of Graphic Arts; Zagreb
• Defense date and country: 2008-10-00, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Graphic Technology

Abstract

Zavisno o koncentraciji 2-propanola u otopini za vlaženje određivala su se njihova fizikalnokemijska

svojstva kao što su električna provodnost, pH vrijednost, napetost površine, te

kontaktni kut na slobodnim površinama tiskovnih formi za ofsetni tisak u novinskoj rotaciji.

Upotrijebljeni su uzorci CtP tiskovnih formi na bazi Ag halogenida, koji nisu i koji su prošli

proces tiska.

Dobiveni rezultati ukazuju da otopina za vlaženje povećanjem volumnog udjela 2-propanola

smanjuje električnu provodnost i površinsku napetost.

Proces vlaženja odvija se u blago kiselom mediju (pH vrijednost iznosi između 4.6 i 4.8), što

ukazuje da su u otopinu dodane soli koje djeluju kao puferi. Dodatak 2-propanola neznatno je

povećava.

Kontaktni kut pri niskim koncentracijama 2-propanola u početku se povećava, da bi pri višim

nakladama pokazao trend smanjenja. Pri visokim koncentracijama 2-propanola u otopinama

za vlaženje kontaktni kut se značajno smanjuje.

Optimalna koncentracija 2-propanola iznosila bi oko 8 do 10 vol%.

Abstract (english)

In dependence of the concentration of the 2-propanol in the dampening solutions, their

physicochemical properties, such as electrical conductivity, pH value, surface tension and

contact angle on non-image areas of typographical form for newspaper offset print were

estimated. Samples of the typographical form, based on a silver halide coating, that were not

and were in printing process, were used.

The obtained results show that by increase of the concentration of 2-propanol in the

dampening solution, electrical conductivity and surface tension of dampening solution

decreases.

The dampening process accrues in mild acid medium (pH value is between 4.6 and 4.8),

which points out that salts acting as buffers are added to the solution. Addition of 2-propanol

slightly increases it.

Contact angle is being increased at low concentrations of 2-propanol in the beginning, and as

it reaches higher edition, it decreases. At high concentration of 2-propanol in the dampening

solution, contact angle significantly decreases.

Optimally concentration of 2-propanol in the dampening solution would be around 8 to 10

vol%.

• Keywords: električna provodnost; kontaktni kut; napetost površine; CtP ofsetne ploče; otopina za vlaženje; pH vrijednost; površinski aktivne tvari (PAT)
• Keywords (english): electrical conductivity; contact angle; surface tension; CtP offset plates; dampening solution; pH value; surface active substances (SAS)
• Language: croatian
• URN:NBN: urn:nbn:hr:216:024843
• 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: Closed access
• Created on: 2024-04-17 10:35:29