EWOD 을 이용한 그라비아 옵셋 프린팅 롤의 표면접촉각 설계

Abstract

In this paper, we investigate the liquid transfer process to increase the ink transfer rate in gravure offset printing through the experiment and numerical method. In the experiment, EWOD device used for making various contact angles on a plate surface. The ink transfer rate between two parallel separating plates was measured according to the various contact angles. Numerical analysis based on the VOF method, was carried out and compared with the experimental results. The ink transfer process takes place two times in gravure offset printing. For making the highest transfer rate, the contact angles of each plate were discussed. It can contribute to the design of the optimal contact angle of the plate roll, offset roll, and substrate for gravure offset printing.