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Effect of Tension on Conductivity of Gravure Printed Ag Layer in Roll-to-Roll Process
강현규,이창우 한국정밀공학회 2015 International Journal of Precision Engineering and Vol. No.
A curing process as a post-treatment of roll-to-roll (R2R) printing is designed to form a functionality of printed pattern such asconductivity when devices e.g., radio frequency identification, fuel cell, display, and flexible printed circuits board are fabricated bysolution-based printing process. Polyethylene naphthalate (PEN) as well as polyethylene terephthalate (PET), which were employedas a flexible substrate, would be stretched much in the post-treatment process due to reduced elastic modulus in high temperature. The elongation of substrate generates cracks inside the printed layer. The formation of crack triggers increasing in electricalresistance and deteriorating in the performance of the device. Therefore, the elongation of substrate should be minimized consideringthe variations of conductivity of printed layer during the R2R process. In this study, a mathematical model for the relationship amongthe operating tension, the temperature, and the conductivity of printed layer was developed. The deterioration of conductivity wasinvestigated by observation of cracks in printed layer. The conductivity of printed layer on the stretched substrate was estimated bythe proposed model. Also, operating tension was determined for guarantying conductivity even in various temperatures for posttreatmentprocess.
롤투롤 인쇄전자에서의 횡방향 레지스터 동적 특성 모델링
강현규,안진현,이창우,신기현,Kang, Hyun-Kyoo,Ahn, Jin-Hyun,Lee, Chang-Woo,Shin, Kee-Hyun 한국반도체디스플레이기술학회 2010 반도체디스플레이기술학회지 Vol.9 No.2
For the adaption of roll-to-roll printing method to the printed electronics, it is mandatory to increase the resolution of register errors. Therefore it is desired to derive the mathematical modeling of register error or to develop controller design. The cross direction register error was derived considering both lateral motion of moving web and transverse position of printing roll. The mathematical modeling was validated and the relationship between the lateral motion and register error was analyzed by numerical simulations in various operating conditions using multi-layer direct gravure printing machine. The results could be used for a design of the CD register in the multi-layer printing and the lateral motion caused by translation.