Abstract
ABSTRACT http://dx.doi.org/10.7584/ktappi.2016.48.1.134Journal of Korea TAPPIVol. 48. No. 1, 2016, 134-141pISSN (Print): 0253-3200Printed in Korea • 부경대학교 공과대학 인쇄정보공학과(Dept. of Graphic Arts Information Engineering, College of Engineering, Pukyong National University, Busan, Republic of Korea) 1 한국특수잉크 기술연구소(Korea Special Ink Co. Ltd, Technical Research Center, Incheon, Republic of Korea)2 주)프린피아 기술연구소(Prinpia, Co. Ltd, R&D Center, Seoul, Republic of Korea)† 교신저자(Corresponding Author): E-mail: jackyha@hanmail.net Dampening in printing is not only used with plain water but also used with various sub-stances like dampening additive, in order to improve the wetting property by lowering the surface tension and to control material for modifing the ink transfer characteristic with proper emulsification. We have studied the printing quality according to these, looking into interrelationship among the dampening solution's pH, electrical conductivity and IPA content, prescribing the proper usage and minimum usage of fountain solution and dampening additive. In this study, it shows good result when mixing at the 7 wt% dampening with additive solution, which is result from the color density of printed sheets in accordance with the change of dampening solution condition. And the printed density value calculated 1 hour after printing, it shows relatively safe value at the etch liquid 4 wt% and IPA addition 2 wt%. The dry down at this test showed similar results regardless of various dampening conditions on coated paper, but in case of uncoated paper, the dry down showed a quite gap of different due to the fast penetration to the paper.Keywords: Dampening solution, eulsification, etch liquid, IPA, conductivity, dry down
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