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Control Of Ink Balance In Offset Printing Production
- May 28, 2018 -

Ink balance refers to the balance between water volume and ink volume during offset printing. In offset printing production, the two laws of oil-water insolubility and selective plate adsorption are used to make ink and water exist on the surface of the printing plate at the same time and keep balance with each other, which can ensure the maximum amount of ink loaded on the printing plate graphic part and enable printing. The ink is bright and saturated, and the dots are clear and smooth, while ensuring that the blank part of the printing plate is clean and tidy.

In the actual offset printing production, the ink-water balance not only refers to the static water volume and ink volume parameter setting, but also is a kind of dynamic control. Since ink emulsification is an unavoidable phenomenon, the balance of ink and water is only a relative concept, and the micro-ink emulsification, that is, the state of “water-in-oil”, is beneficial to the spread and transfer of ink during offset printing. There are many factors that affect the ink-water balance. How to correctly control and control the ink-water balance is the key to ensuring the stability of offset quality.

The main factors affecting the balance of ink and wash

1. Fountain solution pH

If the pH of the fountain solution is too low or too high, it is not conducive to offset printing production. It must be controlled within the effective range and avoid large-scale fluctuations.

2. Resin photosensitive adhesive

The photosensitive resin of the printing plate graphics part should have good oleophilicity, and the sand layer of the blank part of the printing plate should have good water absorption and water retention.

3. Pressure between the ink roller

The pressure between the ink roller must be kept in parallel to ensure smooth and accurate transfer of ink and fountain solution during offset printing.

4. Workshop temperature and humidity

Too high or too low temperature and humidity in the workshop will not only affect the transfer and drying of the ink, but also affect the moisture content of the paper, resulting in the failure of paper feeding and overprinting.

5. Presets for water volume and ink volume

The judgment of the quantity of water and the amount of ink in the offset printing process is very important. The preset values of water volume and ink volume are low, and the printing ink is lighter. If the preset value is too high, the printing ink color is darker.

6. The characteristics of raw materials

The use of papers and inks of different characteristics also has different requirements for the control of offset ink and ink balance. For example, the texture of the paper is loose and loose, and the water content is different; the viscosity and fluidity of the ink are different; and the drying time of the ink on different papers is different. These characteristics will have an impact on the ink balance. Therefore, when the printing conditions such as the printing plate and the workshop temperature and humidity are the same, it is necessary to grasp the changes in the characteristics of the raw materials and to minimize the use of the ink auxiliary agents (such as a varnish, a release agent, a desiccant, etc.).


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