In order to obtain as accurate values ​​as possible from the simulation, it is necessary to consider all the influencing factors in the simulation model. In order to ensure this, it is necessary to do a lot of work to confirm the simulation tool and adapt the simulation tool to use.
Jiang proposed a different simulation model. In the model, the ink transfer system is regarded as a transfer system under control. Here, the ink supply represents the input signal, and the ink transferred to the photosensitive layer is used as the output signal. The split signal is the intermittent ink input, that is, the plate cylinder gap and the single printed image. The complete ink transfer function of the ink transfer system consists of the independent transfer function of each pair of ink rollers. The simulation was performed in the frequency domain, and ink transfer was used as a hysteresis factor. Due to time changes and non-linearities, it is quite difficult to record the ink transferred to the printing plate, which can only be calculated by simplified linearization.
When changing the ink supply, the first model calculated the results of the ink transfer system's response to time. In the lateral direction, it is impossible to optimize the average thickness of the ink layer.
Experimental Research on Ink Transfer
The regularity of ink transfer occupies a very important position in the design of the ink transfer system and the wetting system. Experimental research in this field began early. Broetz and Hars obtained the latest experimental research results in two FGD research projects. In other studies, one purpose of these research projects was to determine the specific amount of ink splitting for the simulation program established by Patzelt and Ruder.
Experiments and independent research on all relevant variables that have an effect on the amount of ink splitting are established, so a complex experimental foothold is established. It includes a continuous ink transfer system with cantilevered bearing rollers, ink temperature control, printing equipment (plates and impression cylinders) and unwinding and rewinding equipment.
The measurement of the thickness of the ink layer is extremely important and must be non-contact. In addition to the traditional instruments for measuring the thickness of ink, a measuring system established in-house consistent with it is used to measure the thickness of the ink layer. The ink layer thickness measuring instrument invented by FOGRA uses infrared light when working, because the maximum absorption value of the overlapping of the wetting fluid and the ink in the maximum range is reflected in this band. Due to the overlapping absorption spectra of wetting fluid and ink in the maximum range, the signal is completely separated. The absolute measurement of the thickness of the wetting fluid and the ink layer can only be measured with precise scale dimensions. Since the measurement of the ink layer thickness measuring instrument is only possible on the printing plate material, an additional roller is required to measure the thickness of the ink layer on the elastic ink roller. This led to the development of the ink layer thickness sensor mentioned above. The sensor uses visible light, but it can only be used without wetting fluid. These two tests
In order to determine the thickness of the ink layer by measurement, the volume system needs to be calibrated.
Split factor of all ink layers. Or a different ink layer splitting factor β is used as a parameter describing ink transfer consistent with the following equation:
aij = s'j ï¼ (si + sj)
= s'j ï¼ (s'i + s'j)
βij = (sj + sj) ï¼ (si-sj)
= (si- si ') ï¼ (si-sj)
= W / (si-sj)
(aij is the splitting factor of all ink layers, s is the thickness of the ink layer, βij is the difference of the splitting factors of the ink layer, and w is the thickness of the transferred ink layer)
The determination of most variable parameters requires experiments, and it is more difficult to describe the results of the parameters clearly and comprehensively. Therefore, experiments and descriptions were carried out with one parameter changed and other parameters unchanged.
Experiments have shown that at constant printing speeds, the ink splitting factors at the ink separation swing frequency are interdependent. In the case of experimental input of wetting fluid, the ink splitting factor is considered to increase faster than in the case of no input of wetting fluid.
Conclusion
A large number of parameters and methods described in the designed experiments are now used more and more. Increasing the importance of these parameters and methods in multivariate changes can allow the number of experiments to be reduced, that is, in each experiment, several variable parameters are changed. The ink layer thickness measuring instrument invented by FOGRA is a more advanced instrument in the world at present, which has practical value for the measurement of ink transfer and transfer.
The experiments so far have caused a significant increase in the level of knowledge about wetting fluid and ink transfer. However, a complete description of a set of formulas requires consideration of all relevant parameters. This description has not yet been found.
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