4. Connect the part
The influence of ink performance on ink transfer

Ink with low viscosity and high fluidity is easy to transfer and has a high transfer rate; ink with high viscosity and low fluidity has a low transfer rate. To increase the ink transfer rate, the viscosity and fluidity of the ink must be controlled. The performance of the ink will also change with environmental changes. When the temperature is high, the viscosity of the ink is lower, and when the temperature is low, the viscosity of the ink is higher. In actual production, inks of different models, types and different drying methods should be selected according to the actual situation. In addition, adding an appropriate amount of varnish to the ink can adjust the performance of the ink, which is beneficial to control the dot gain and increase the ink transfer rate.
 
The effect of blanket performance on ink transfer

The blanket must have good ink absorption and ink transfer properties, as well as oil resistance, acid resistance, alkali resistance, and good elasticity. If the blanket is not cleaned thoroughly after printing, the ink retained in the fluff will slowly harden the conjunctiva, which will damage the fluffy structure of the rubber surface, which will directly affect the ink acceptance rate of the blanket, thereby reducing the ink transfer rate of the blanket. Therefore, after printing, the blanket should be washed thoroughly. If the downtime is relatively long, a layer of pumice powder can be rubbed on the surface of the blanket to keep the original fluffy structure on the surface of the blanket and to ensure that the blanket has good ink absorption and ink transfer.

5. The effect of paper suitability

The suitability of paper is mainly reflected in smoothness, whiteness, stiffness and so on. Paper with high smoothness requires a relatively small amount of ink; paper with poor smoothness requires a relatively large amount of ink. In the printing process, the amount of ink required for different papers varies according to their surface conditions. Under the conditions of the same variety, same weight, and the same price, paper with higher smoothness and whiteness has better printing quality than paper with lower smoothness and whiteness.

6. The influence of plate suitability

The quality of the base sand of the printing plate, the hydrophilicity of the metal plate surface, and the lipophilicity of the coated polymer resin film surface are related to the suitability of the printing plate, and affect the ink transfer and the ink balance of the plate surface. In the process of plate making, the quality of exposure and development will also affect the performance of the printing plate.

7. The influence of ink and wash balance

The ink and wash balance is a relative balance, not an absolute balance. In the process of high-speed operation of the equipment, the graphic part and non-graphic part of the printing plate are both inked and watered, and there is mutual penetration, so the ink emulsification phenomenon will inevitably occur on the printing plate. If the amount of water and ink is not well controlled, it will inevitably deepen the emulsification of the ink, resulting in smeared and dirty plates during printing. When printing, the method of reducing the amount of water and increasing the amount of ink is usually adopted, but sometimes the amount of ink is also reduced. In addition, ink emulsification will vary with environmental conditions. In actual printing production, the viscosity of the ink and the pH of the fountain solution should be controlled according to the actual situation. The burnt version and the non-dirty version are the benchmarks.

8. The influence of printing pressure

Printing pressure refers to the interaction force between the printing plate cylinder and the blanket cylinder, and between the blanket cylinder and the impression cylinder. It is a necessary condition for ink transfer. If the printing pressure is too small, the ink is not easy to transfer, and the ink is light and empty; if the printing pressure is too high, the ink volume expands to the non-graphic part, which makes the dots increase seriously, the image is distorted, and it is also easy to make the printing plate and the blanket resistant to printing decline. Therefore, the mechanical pressure must be adjusted correctly. Different quantitative papers require different printing pressures, and only proper printing pressure can ensure uniform ink color and consistent density.