1. The role of the inking device
The function of the inking device is to quickly distribute the ink stripe output by the ink fountain roller from the circumferential direction and the axial direction, so that the ink transferred to the printing plate is uniform and appropriate. With the increase in speed of modern offset presses, this requires that the time for the ink from the ink fountain to the printing plate to shorten the ink distribution process is shortened, and the water and ink balance is faster. Therefore, when designing the inking components, not only the main technical parameters must be determined, but also the ink roller arrangement scheme should be properly selected.
Second, the composition of the inking device
The quality of printing quality and the structural design and manufacturing accuracy of the inking device are related equipment consumables. The inking devices designed by offset press manufacturers in different countries have different rubber roller arrangements, different structures and degrees of automation, but in general, their components are similar, divided into the following three parts: ink supply part, uniform Ink part and inking part.
3. Design requirements of inking device
In the design of the inking device, comprehensive consideration must be given to the structure, operation, and safety of the complete machine. The main requirements are as follows:
1. Stable, even and appropriate amount when inking the printing plate.
2. The power required for the entire inking unit is small.
3. The structure is simple, the work is reliable, and the operation is convenient.
4. It can sensitively adjust and change the amount of ink supply, and the ink supply can realize stepless adjustment.
5. There are manual or automatic independent operation buttons. During commissioning or start-up, the time required for the inking unit to stabilize is the shortest.
4. Performance evaluation index of inking device
The evaluation of the performance of the inking device is multi-faceted, and the quality of its ink supply cannot be solved from a single aspect. In the past, the design of the inking device used the method of experiment and comparison to finally select the best solution. This method is expensive and the staff has a heavy burden. At present, the design of the inking device generally adopts computer-aided simulation design. This design can not only analyze the static and dynamic indicators of the inking device, but also analyze the working status of the inking device to find the best system. Operating parameters. The performance indicators and parameters of the inking device are mainly considered from the following aspects.
(1) The length and direction of the ink road: the ink road has its own length and its length, and its length has its pros and cons. However, the ink roads of major brands of offset presses in the world are all developing in the direction of the short ink road. The reason why the ink path becomes shorter is because the following aspects have been greatly improved.
First of all, the use of simulation in design; second, the quality of ink has been greatly improved; third, not only the quality of ink roller has been greatly improved, but also the use of special patented rollers according to different parameters of the model during design .
The ink path can also be divided into a single ink path and a double ink path from the way of transferring ink. KBA Rapida 105 is a single ink path and 162 is a double ink path. The ink paths of different models of the same brand are sometimes different, which means that the ink paths are comprehensively considered in the design process according to the parameters such as the structure, speed, and printing format of the model. It is not difficult to see from Figure 1 that different formats have different requirements for ink paths. Large format models with a wider format have higher requirements for ink color uniformity. Generally, the number of ink rollers is more than that for startup and the arrangement is not a single ink path.
The direction of the ink path is mainly to consider the fluidity of the ink, and the ink transfer route generally adopts the principle of supplying the printing plate ink from top to bottom. Only when the structure does not allow the ink to be uploaded from the bottom, such as BB double-sided offset printing machine. This form of ink transfer from the bottom to the top affects the ink leveling effect, which can easily cause the failure of the ink in front and back. The contact pressure of the ink roller must be appropriately increased during operation.
With the advancement of science and technology, many advanced offset printing presses use the separation and fast separation of the ink leveling device: quick start system, such as Roland 700. When the printing process fails, the cylinder is depressurized and the inking roller is lifted, while the ink accumulated on each inking roller continues to pass downward and accumulates on the inking roller. When printing again, the ink color will be too dark or cause Paste version. And this system will separate the ink path from the middle when the printing failure occurs and shuts down the ink passing down, which greatly reduces the cost caused by the shutdown.
(2) Ink coefficient: Offset presses are generally four plate-based rollers to obtain an appropriate ink coefficient printing market. In the design of the ink path, the ink path of the first two ink rollers should be short; the main function of the two back plate rollers is to spread the ink evenly, and the last ink roller also has the function of storing excess ink. Therefore, in the design of the ink path, the ink paths of the last two ink rollers are longer. If the final inking roller is small in diameter, ink sticks and ghosts are likely to appear during the printing process.
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