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Comparative Study of the Physical Properties of Hybrid and UV Offset Inks
Authors: Jašúrek Bohumil | Odstrčilová Helena | Vališ Jan
Year: 2013
Type of publication: článek v odborném periodiku
Name of source: Scientific Papers of the University of Pardubice, Series A, Faculty of Chemical Technology
Publisher name: Univerzita Pardubice
Place: Pardubice
Page from-to: 249-256
Titles:
Language Name Abstract Keywords
cze Srovnávací studie fyzikálních vlastností hybridních a UV zářením tvrditelných ofsetových barev Chování batev při tisku silně závisí na fyzikálních vlastnostech tiskových barev. V této studii byly sledovány vlastnosti (emulgovatelnost, reologické vlastnosti, lepivost, prášivost) dvou typů hybridních a dvou typů UV tvrditelných ofsetových barev. ofset; UV barva; hybridní barva; reologie; lepivost; prášení
eng Comparative Study of the Physical Properties of Hybrid and UV Offset Inks The printability of offset inks strongly depends on the rheological properties of printing inks, their tack and fountain solution pick-up behaviour. In this work, two process hybrid inks (XSYS Print Solution) and two UV curable inks (Sun Chemical) were tested. Studied process inks were in both cases cyan and magenta. UV offset printing inks dry by chain reaction (free radical or cationic polymerization) that is induced by UV radiation. UV inks give a number of advantages compared to conventional offset printing inks. Between the most important ones belong rapid curing time (fractions of second), high print gloss, abrasion resistant surface, very good chemical resistance and also less problems of sample blocking. Hybrid inks are based on conventional offset printing inks, but contain part of UV curable components as well and are able to run on conventional press machine equipped with UV radiation source. Hybrid inks are cured by two various mechanisms (oxypolymerization and polymerization induced by UV radiation). One of the major advantages of hybrid ink technology is that smaller commercial printers can add inline UV varnishing to their operations at relatively low cost. The hybrid inks should be printable with blankets that are also suitable for conventional inks (NBR rubber) compared to UV inks that need special blankets (based on EPDM). The tested physical properties were evaluated for unemulsified inks and their emulsions with fountain solution (90 % of water, 5 % of fountain solution additive V50 (POOLA) and 5 % of isopropyl alcohol). Emulsions of inks and fountain solution were prepared by Duke Ink Water Emulsification Tester Model D-10 and were characterised by the amount and rate of fountain solution pick-up. The rheological properties (flow behaviour, thixotrophy, and viscosity relaxation) were measured by rotational rheometer RV1 HAAKE. Offset; UV Ink; Hybrid Ink; Rheology; Tack; Misting

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