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Bibliographic record number: 474688

Journal

Authors: Cigula, Tomislav; Mahović Poljaček, Sanja; Gojo, Miroslav; Novaković, Dragoljub
Title: Roughness of nonprinting surfaces of the offset printing plate depending on processing solution concentration
Source: Conference Proceedings MATRIB 2010. / Schauperl, Zdravko ; Šnajdar, Mateja (ed). - Vela Luka : Croatian Society for Materials and Tribology , 2010. 44-50 (ISBN: 978-953-7040-18-5).
Meeting: MATRIB 2010
Location and date: Vela Luka, Hrvatska, 23-25. 06. 2010.
Keywords: chemical developing; printing plate; surface roughness;
Abstract:
The plate making process is composed of two main processes: exposure of the photoactive layer and its chemical processing. The conventional diazo positive as well as most of the CtP lithographic plates has to be developed in a high alkaline solution (pH ≈ 12). During this processing, exposed areas of the photoactive layer are being removed from the nonimage surfaces of the printing plate. It is possible that processing solution dissolves a part of the aluminium-oxide layer too. The aluminium –oxide layer has porous structure with high specific surface which enables it to adsorb optimal amount of the fountain solution sufficient for achieving high quality prints. The aim of this paper was to determine relation between surface roughness parameters measured on aluminium-oxide surfaces and concentration of processing solution. The changes of the roughness of the aluminium-oxide are caused by his as well as aluminium's amphoteric properties (soluble in acid and alkali solutions) which makes it soluble in processing solution during developing process. For the purpose of this research a conventional diazo positive lithographic printing plate was developed in a processing solution with various concentration of sodium base. Obtained results showed that alkali concentration in the processing solution has significant influence on roughness parameters of the nonimage surfaces of the lithographic printing plates. One must take these results into account before plate making process starts. It is important to determine all explored process parameters which are significant for achieving printing plates of high quality.
Type of meeting: Poster
Type of presentation in a journal: Full-text (1500 words and more)
Type of peer-review: International peer-review
Project / theme: 128-1201785-2228, 128-1281957-1958
Original language: ENG
Category: Znanstveni
Research fields:
Graphic technology
Contrib. to CROSBI by: mgojo@grf.hr (mgojo@grf.hr), 28. Lip. 2010. u 14:03 sati



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