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윤덕균(Deokkyun Yoon),이승현(Seung-Hyun Lee),강정식(Jeongsik Kang),최병오(Byung-Oh Choi) Korean Society for Precision Engineering 2011 한국정밀공학회지 Vol.28 No.10
Roll-to-roll process is an emerging mass production method for printed and flexible electronics such as touch screen panel, RFID tag, thin film solar cell, and flexible display due to its high throughput. High precision in printing and coating is required to apply functional materials onto substrate. For such reason, every part of the roll-to-roll equipment needs to be precisely fabricated and to retain its precision under regular operation. In this article, the precision of cantilever type idler roller and a novel method to mitigate its deflection under web tension loading are discussed and the method is verified using both the numerical and the experimental works. The proposed method improves the structural rigidity of cantilever type roller whose advantages, such as low capital cost and high web path configurability, are maintained.
그라비아 옵셋 프린팅 공정에서의 잉크전이 메커니즘 해석 연구
이승현(Seung-Hyun Lee),남기상(Ki-Sang Nam),이택민(Taik-Min Lee),윤덕균(Deokkyun Yoon),조정대(Jeongdai Jo) Korean Society for Precision Engineering 2011 한국정밀공학회지 Vol.28 No.10
Ink transfer process is very important to determine quality of printed pattern, therefore its mechanism should be understood to control printing quality. Although there have been many attempts to understand ink transfer mechanism by numerical simulation and experimental studies, their model was too much simple to model realistic printing process and our understanding is not enough yet. In this paper we designed ink transfer visualization system to present flow visualization of ink transfer process for gravure offset printing. We considered rotational effect of blanket roll which is related with printing speed and used non-Newtonian fluid as working fluid such as Ag paste. For printing unit, cantilever-type blanket roll is used for convenient visualization of ink transfer. Serial images were captured continuously by using highspeed CMOS camera and long range microscope. We investigated the effects of various design parameters such as printing speed and pattern angle on the ink transfer process. We found more stretched ink filament for non-Newtonian fluid than Newtonian fluid. As increasing printing speed, length of stretched ink filament and height of break-up point are also increased. We also compared ink transfer process between CD and MD pattern and its relationship with ink transfer mechanism.
롤투롤 다중 인쇄 방식 장비를 이용한 잉크 전이성 평가
유하일(Ha Il You),김충환(Chung Hwan Kim),윤덕균(Deokkyun Yoon),조정대(Jeongdai Jo),최병오(Byoung-Oh Choi),김동수(Dong Soo Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
The roll-to-roll printing machines are under development for the application of printed electronics. In this study, the developed roll-to-roll printing machine with multiple printing methods is introduced and the printed patterns by several printing methods are compared. It is found that even for the same conductive ink, the application of different type of printing methods gives the different printing results. The developed machine could be used for the fabrication of printed electronics devices by several printing methods and inks as well as for the optimization and evaluation of inks and their printing methods.