There are a lot of notes about water-free and single-fluid systems, but two-fluid systems that use ink and water also need to pay attention to many things.
Although there have been many advances in the development of web printing presses, especially factors such as registration, plate scanning, ink pipe pre-setting, etc., system control and performance have greatly improved, but the humidity factor has hardly changed In addition to the use of spray wetting technology.
Before discussing this issue, you must first ensure that the humidity value applied during operation can be accurately measured. For example, it can be easily calculated from the image on the printing plate: how to adjust the ink fountain to obtain the appropriate density and coverage in a certain area of ​​the printing plate. For example, if the printing plate needs a total of 73% ink coverage, then 27% of the part only needs to be wetted and no ink is needed at all. At the same time, we also recognize that the original data and relationship between ink and water are not linearized under any printing conditions. But in any case, a calculation rule can be designed to ensure that the correct wetting degree can be obtained in all printing environments. This rule can also be extended to the use of an "online" device for dynamic real-time measurement of the wetted film on the printing plate, just like some online color control systems.
In order to effectively use these data, the wetting medium in a certain area must be precisely controlled, just like an ink fountain. For example, the ink value is usually 32 across the width of the printing cylinder. One of the systems to achieve this control is spray wetting. At present, spray nozzles are used on many cold-set printers, and there are usually only 8 nozzles on double-width printers, and the maximum spray rate is only about 60hz. If the number of existing nozzles is increased, the spray rate is increased to about 120hz, and the closed-loop system is used to continuously measure the wetting film on the printing plate, then the performance of the existing wetting technology is likely to be greatly improved.
This method has many advantages: you can preset the wetting characteristics file, reach the moisture balance faster, reduce paper waste, reduce ink consumption, shorten printing preparation time, truly achieve closed loop color control, and ensure printing throughout the printing process quality. The system can also be continuously improved to extend the service life of older presses and maximize the functions of new presses.
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