Usporedba razvijača za klasični i CTP ofsetni tisak

master's thesis

• Author: Sonja Kabljanac
• Mentor: Miroslav Gojo (mentor)
• Committee member: Miroslav Gojo (član povjerenstva)
• Granter: University of Zagreb; Faculty of Graphic Arts; Zagreb
• Defense date and country: 2006-6-00, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Graphic Technology

Abstract

Ekološka štetnost rabljenih razvijača nakon razvijanja ofsetnih ploča i njihov

utjecaj na okoliš nužno uvjetuje njihovu obradu i zbrinjavanje. Rabljeni razvijači

zbog potrebite kemijske reakcije imaju izrazito lužnati karakter, te se kao takvi

nesmiju ispuštati u otpadne vode. Osim lužnatog karaktera sadrže i organske

komponente zaostale nakon otapanja kopirnih slojeva koje također mogu

zagaditi okoliš.

Ispitivana su dva uzorka razvijača jedan za klasične a drugi za CTP ploče.

Utvrđeno je da se neutralizacijom s HNO3 nastaje voluminozni želatinozni talog, te da se pH vrijednost dobivenog filtrata ponovno povećava stajanjem, te ga je

moguće ponovno neutralizirati. Dobiveni želatinozni talog ima svojstva

hidrofilnog koloida, a mase dobivenih taloga povećavaju se dodatkom HNO3.

Metodom atomske adsorpcije u ispitivanim razvijačima nije detektirano srebro

kao jedan od mogućih sastojaka kopirnog sloja koji može biti uzrokovan

sutaloženjem sa hidrofilnim koloidom.

Abstract (english)

Due to their ecological hazardousness after developing of offset boards and their

environmental influence, the used developers require processing and proper

disposal. The used developers have an extreme alkaline complexion due to their

needy chemical reactions, so they cannot be drained into the liquid waste.

Except high alkalinity level they also have organic components remained after

dissolution of copy layers, which can pollute the environment too.

Two samples of developers were examined, one for classical, another for CTP

boards. It has been established that trough the neutralization with HNO3 a

voluminous gelatinous sediment has been created, so that the pH-value of extracted filtrate increases when stagnating, and as a result it is possible to

neutralize it again. The extracted gelatinous sediment has characteristics of

hydro file colloid, and the mass of the extracted sediments can be increased by

adding of HNO3. With the method of atomic absorption in examined developers, no silver has been detected, as one of the possible components of the copy layer

that can be caused by sub- sedimentation with hydro file colloid.

• Keywords: neutralizacija; pH vrijednost; Rabljeni razvijač; taloženje
• Keywords (english): neutraliztion; pH value; used developer; sediment
• Language: croatian
• URN:NBN: urn:nbn:hr:216:614478
• 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: 2024-04-18 14:10:10