SODIUM METASILICATE SOLUTION AS A DEVELOPER FOR CTCP OFFSET PRINTING PLATES (CROSBI ID 592143)
Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Cigula, Tomislav ; Poljak, Jelena ; Peko, Vedrana ; Tomašegović, Tamara
engleski
SODIUM METASILICATE SOLUTION AS A DEVELOPER FOR CTCP OFFSET PRINTING PLATES
Many printing techniques increase their market share, but offset printing is still market leader in printing of many graphic products. It is a very complex process in which printing plate has significant influence on the final reproduction quality. Offset printing plates are in most cases built of aluminium foils which are processed in order to enhance needed surface characteristics and ensure stability and durability in the printing process. One of the key processes in the plate making is developing which must remove ink receptive photoactive layer, but in the same time minimizes change of the hydrophilic aluminium-oxide layer. Therefore, chemistry free and low chemistry plates are being developed, but they are still not used when it comes to the high quality products and reproduction of long runs, so improvement of the chemical developing processes is of high importance. This research was conducted in order to investigate application of developers based on the sodium metasilicate of various concentrations. For that purpose samples of printing plates coated with positive diazo photoactive layer were exposed in same condition and then developed in developers with five different concentration of sodium metasilicate. Determination of influence on the aluminium-oxide layer was made by observing profilometric roughness parameters and the contact angel values when applying two different fountain solutions. Results of the investigation have shown that concentration of the sodium metasilicate has an impact on the aluminium-oxide roughness and consequently wetting properties, but comparing it to the other investigated developers, the impact is smaller. Results have showed high correlation between contact angle roughness parameters values, showing high influence of surface structure on wetting properties. This research has proved the influence of investigated developing process on the non-image area surface, which could cause problems in printing plate exploitation. In addition, the sodium metasilicate proved to be possible chemical compound to be used for developing of investigated printing plate type, but prior to that there must be further research conducted to determine its behaviour in other process parameters.
lithography; roughness parameters; contact angle; developing; sodium metasilicate
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Podaci o prilogu
115-120.
2012.
objavljeno
Podaci o matičnoj publikaciji
GRID 2012 PROCEEDINGS
Novaković, Dragoljub
Novi Sad: Faculty of Technical Science, Department of Graphic Engineering and Design
978-86-7892-457-6
Podaci o skupu
6th International Symposium on Graphic Engineering and Design
predavanje
01.01.2012-01.01.2012
Novi Sad, Srbija