Selectivity of ink and fountain solution adsorption in the PS plate section

The specific surface energy of the PS plate section is slightly higher than the specific surface energy of the ink, but lower than the specific surface energy of the fountain solution. According to the second law of thermodynamics, only the process of reducing the energy of the system can proceed spontaneously. The spread of the ink on the graphic section of the PS plate can lead to a reduction in the energy of the system and can be carried out spontaneously. For fountain solution, on the contrary, the fountain solution in the PS version of the exhibition will cause the system to increase energy, which is a non-spontaneous process. Therefore, the Ps version of the graphic part of the ink and fountain solution adsorption is selective, the fountain solution is based on the graphic is not wet.