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데이터 보상을 통한 롤투롤 인쇄 장비의 레지스터 오차 인식 개선 및 제어
전성웅(Sung Woong Jeon),박종찬(Jong-Chan Park),남기상(Ki-Sang Nam),김철(Cheol Kim),김동수(Dong Soo Kim),기충환(Chung Hwan Kim) Korean Society for Precision Engineering 2014 한국정밀공학회지 Vol.31 No.11
Register control of roll-to-roll printing system for printed electronics requires accurate measurement of register errors. The register marks used for the recognition of patterns position between layers have inherently defects due to low printability of register marks themselves, which brings out inaccurate register accuracy and consequently low performance of printed electronics devices. In this study, the compensation methods for the unrecognized or missing register data are proposed to improve the recognition and consequently the control performance of register accuracy in roll-to-roll printing equipment. The compensation methods using the prior data and the linear interpolation are proposed and compared with the case without compensation for the simulation as well as experiment. Only the linear interpolation method could successfully compensate the missing data and consequently improve the register control performance. We should apply the compensation process of the register errors to improve the register control accuracy in the roll-to-roll printing equipment.
롤투롤 시스템의 와인더 반경 추정을 이용한 와인더 장력의 가변 PID이득 제어
박종찬(Jong-Chan Park),전성웅(Sung Woong Jeon),남기상(Ki Sang Nam),김충환(Chung Hwan Kim) 한국생산제조학회 2013 한국생산제조학회지 Vol.22 No.4
The dynamics of the winder roller of a roll-to-roll printing system for printed electronics is a time-varying system because of the variation of the winder roller radius owing to rewinding or unwinding of the web. Therefore, an adaptive control method considering the time-variant characteristics is required for precise tension control. In this study, the variable PID gain method is applied to the actual roll-to-roll system and verified by experiments for unwinder tension control. The required value of the winder roller radius for the application of the variable PID gain is estimated from the measurement of the winder tension and winder motor torque. The simulation results as well as experimental results show that the fixed PID gain control cannot stabilize the tension of the winder roller with varying winder roller radius. On the other hand, the variable PID gain method can control the tension of the winder roller regardless of the winder roller radius.