Study On The Predictive Model Of The Combination Of Ink And Paper

The quality of the printing production of is always the focus point of the printing industry. The quality of the printing production not only related with the press speed, the press pressure and the environment of the printing, but seen from the reality process of printing, it also has a high relationship with the combination of the paper and the ink. In addition, the combination of the paper and the ink has a high relationship with the paper’s capillary radius. So, this thesis analyses the measurement model of the paper’s capillary radius by using the fractal theory.There are two combination methods between the paper and ink: expanding and permeating, and this thesis mainly to study the behavior of permeating. The permeating mainly happens during two processes: one is press phases; the other one is free permeating phases. The interaction of the pressure and the capillary make the ink to enter the paper. During the press phases, the ink enter the paper via pressure, this phrases is the main part and have a great influence for the whole permeating depth. During the free permeating phrases, the ink enter the paper via adsorbility of the capillary, the influence of this part is relatively small.There are 2 processes during the permeating: pressuring process and free permeating process. Use the flow fluid equation to get the ink permeating depth during the pressuring process which avoids the simplification of the capillary radius. Use the dynamic wetting equation to get the permeating depth during the free permeating process considering the dynamic contact angel changing with the dynamic contact line velocity. Finally, we proved the feasibility of the model via serious experiments.