Analysis of the relationship between ink preset and water-ink balance

Ink presetting is an auxiliary control of the ink supply of the printing press, which provides pre-digital and digital support for the adjustment of printing ink, so that the ink color of the layout can be accurately adjusted before starting. Water-ink balance is an important part of printing process control. The dynamic balance of ink volume and water volume will affect the transfer performance of ink to the layout and the actual ink demand on the layout. Therefore, there is a certain relationship between ink preset and water-ink balance Association. The application of ink preset technology will promote the establishment of water-ink balance in the printing process, and a good water-ink balance will also help the full play of the ink preset effect.

Ink presets promote the establishment of water-ink balance

1. Ink and ink balance

The concept of water-ink balance runs through the entire process of printing production, especially the establishment of water-ink balance as soon as possible at the beginning of the startup, which helps the printing press enter normal operation. A good ink-water balance is essential to print quality.

Water-ink balance contains two layers of concepts, one is the relative balance of water volume and ink volume on the plate surface, that is to ensure that the volume ratio of the wetting fluid contained in the ink is 15% to 26% when the ink is in the water-in-oil state, and the maximum is not more than 30% . The second is to print the most solid ink color with the smallest amount of water. The first point is the basic balance, and the second point is a higher level of balance. The first kind of balance is relatively easy to obtain, it does not need to appear large or small, but it is easy to appear large or small, the second state basically solves the problem of large or large water Little ink is small.

The balance between the ink demand and ink supply of the layout is the key link to form the state of water-ink balance. The fineness of water and ink management on printing presses is different. In newspaper presses, the amount of water is adjusted by the width of every four-page layout, and the control of the ink is adjusted by a width of about 40mm. Ink adjustment is more meticulous, so it is easy to appear the water and ink imbalance in an ink area, so to achieve the entire layout of water and ink balance, water volume adjustment alone is not available, and must be balanced by ink volume adjustment.

We found that the ink color is the lowest score among all four indicators when the newspaper association uniformly appraisal or even the internal appraisal of each factory, and the poor balance of water and ink is the main influencing factor. Therefore, setting the ink key according to the actual amount of ink required is one of the foundations for forming a good water-ink balance on the full-page, which is also a good promotion of the ink preset to the water-ink balance.

In addition, the printing machine controls the amount of ink in addition to fine control of the ink key, as well as the difference in the rotation speed of the anilox roller of the rotary machine or the contact time of the swing roller on the sheet-fed printing machine Control, these two controls need to cooperate well in order to fully establish the water-ink balance of the printing press.

2. Ink preset

Ink presets play a crucial role in promoting the balance of water and ink. Water-ink balance is a dynamic balance, and changes in the amount of water or ink will break this balance. It is necessary to establish the water-ink balance as soon as possible at the initial stage of startup, and in this process, if the ink volume always changes, it is difficult to establish the water-ink balance. Through ink presetting, the opening of each ink key on the printing plate has been accurately pre-adjusted according to the layout before the machine is turned on, and the relative opening of each ink key is relatively balanced. Generally, there will not be a large adjustment of the opening of the ink key In the case of, only the individual ink keys need to be corrected. At this time, the operator can focus more on the control of the overall ink volume. Through the adjustment of the speed of the ink fountain roller and the total water volume control of the layout, a good water and ink balance is achieved.

Newspaper printing has strong timeliness, many layouts, and a high proportion of color layouts. In order to establish the water-ink balance of the printing machine as soon as possible, many collar machines first enlarge the water and then adjust the ink volume. Adjusting the amount of ink in this way generally does not appear to be dirty, but it is easy to appear large in water and ink. Newsprint has strong water absorption, wet press and wet printing. Excessive water will cause excessive deformation of the paper, resulting in inaccurate overprinting, and will also slow down the drying speed of the ink. Through ink presetting, you can focus more on water and ink balance control, and at the same time solve the problem of soiling during ink adjustment, and also reduce the occurrence of water and ink to a certain extent.

In short, the ink preset can solve the problem that the water-ink balance cannot be established for a long time caused by the large-scale ink volume adjustment after startup, promote the establishment of the water-ink balance as soon as possible, and greatly reduce the startup waste. [next]

Ink balance helps the ink preset function

The amount of fountain solution and the amount of ink are related to each other, and this balance affects the degree of accurate transfer of ink to the plate. The performance of water and ink imbalance is mainly water and ink, water and ink, water and ink, and water and ink. No matter what kind of unbalanced state, it will directly affect the size of the ink supply on the layout. Poor water and ink balance, and the determination of the ink volume of the printing plate is not good, and good water and ink balance control helps to form a stable ink supply, and helps to fully exert the ink preset effect.

The ink preset is for better ink color performance on the layout, which is the same as the purpose of water-ink balance. Too much or too little water volume directly affects the amount of ink transferred to the layout, thereby affecting the exact correspondence between the actual ink consumption of the layout and the ink supply of the ink fountain. In addition, the excessive amount of water will also reverse the fountain solution to the ink system, which will affect the efficiency of ink transfer and thus the accuracy of ink presetting.

The accuracy of ink preset refers to the amount of correction according to the ink demand of the layout after the ink preset. The state of water-ink balance determines the amount of ink on the layout. Without the guarantee of water-ink balance, it is impossible to have accurate ink demand, and this correction cannot be accurately controlled. If the water-ink balance in the printing process is not good, and the amount of ink on the layout is not good, the preset effect will not play out.

The state of water-ink balance affects the full play of the ink preset effect. This is more obvious in newspaper printing, and the poor balance of water and ink is one of the reasons that affect the performance of ink presetting.

Understanding of ink presets

The understanding of ink presetting technology helps to use it correctly. Since the ink preset provides accurate ink volume information and has been pre-adjusted, since the printer has a good ink-water balance, does it require no operator adjustment during printing?

Ink presets are not "just set". Ink presetting is to convert the digital image description information of the prepress layout into ink key information through a certain algorithm according to a mathematical simulation method. This requires the process of partitioned ink coverage calculation, ink key value correction, and ink fountain roller speed correction. All these processes are performed under the control of standard mathematical formulas.

Since the printing press is a simulated device, the actual ink consumption for printing always changes with changes in related environmental factors, such as raw materials, temperature and humidity, and adjustment of the printing press. It is impossible to completely correspond to these variable factors with a mathematical standard algorithm corresponding to a simulated device. In addition, the principle of the ink zone division of the printing machine and the characteristics of the ink roller series determine that the ink supply amount does not exactly correspond to the ink coverage of the corresponding part. For example, the opening of the ink keys of the two adjacent ink zones cannot be too different Otherwise, it will restrict each other; if the setting of the ink fountain roller speed is related to the current press state and raw material characteristics, it is more of an empirical value. All of these make the conversion relationship from ink coverage to ink key opening impossible to be absolutely accurate. The accuracy of the calculated ink coverage and the actual ink key volume is only 40%, which is improved to about 80% after correction. The remaining 20% ​​needs to be corrected before or after booting according to the status of the printing press and the layout.

It should be said that the 20% correction is still the adjustment of the amount of ink on the layout, which will still affect the water-ink balance of the printing press. After the ink is preset, it only increases the speed of water-ink balance and reduces the difficulty of maintaining water-ink balance, but it is not necessary to pay attention to the state of water-ink balance.

In addition, the ink preset can be understood as including two processes of "pre" and "set", "pre" means that the ink key of the printing press can be accurately set before the start according to the layout information, this process needs to be supported by pre-press data , Ink calculation and correction software to calculate, get the relative information of the ink amount before starting, which is roughly equivalent to the work done by the CIP3 export software and CIP3 ink preset workstation in the CIP3 technology.

The "setting" of the ink preset is to automatically or manually adjust the ink key according to the above information, which is roughly equivalent to the process of importing the ink preset information into the ink table with a data interface, or to manually adjust according to the above information. It can be seen that the concept of ink preset focuses on "pre-", and providing the printing press with pre- and accurate adjustment support is the core of ink preset technology. The "setting" of the ink preset is a requirement for the data interface capability of the printing machine. A printing machine without a data interface can also be realized by manual adjustment.

Ink presetting is a closed and automated presetting process. People always put their core on the printing machine interface, that is, on the process of "setting", which limits the speed of ink presetting technology to a certain extent. popular. If there is a system with pre-press data export and operation correction function, ink presetting can also be achieved. It should be seen that CIP3 is only one way to achieve ink presetting, not all.

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