Abstract: The viscosity of the ink will influence the transfer rate of printing ink and image quality. In actual production, for having good printing ink, operation personnel must adding thickener or diluent to adjust the viscosity of ink printing, bound to internal components and its properties of which influence printing quality. Thus, the process of the offset printing ink viscosity control is very important.
This research on printing ink viscosity, determine the experiment scheme, in the same printing pressure, different ink viscosity, the same type of paper and ink, using ink printing, printing process simulation apparatus by different measurement ink printing ink, and being transferred from the roller on material, to test the transfer rate of printing ink. Based on these data, found out the practical function equation between the viscosity of printing ink and the transfer rate of printing ink, for the best printing ink viscosity in the actual production. In the actual production, the printing ink control and print quality inspection control has certain scientific basis. In the current system of printing industry，increase the theoretical basis and effective experimental data. Improve the production efficiency, thus realize enterprise value, let the printing industry towards intensive road.
Keywords：offset printing; Ink viscosity; Ink-transfer rates
