An Analysis of the Causes of Poor Ink Dropping in Newspaper Printing
In recent years, newspapers have become thicker and thicker, and more colors have been printed. Newspaper competition has become more and more fierce. Improving timeliness and printing quality have become two key factors in newspaper competition. There are many factors that affect the printing timeliness and printing quality of newspapers, and the failure of printing equipment is one of the reasons. Here I will only make a simple analysis of several cases of poor ink in the ink fountain. Keeping the ink fountain in a good state is the basis for ensuring the normal durability of the printing plate and the ink color required for the printed product, which effectively reduces the time for changing the plate during the printing process and helps to improve the timeliness of newspaper printing.
1 Ink emulsification is too serious
The reason for this is that there is water in the ink fountain, so that during the operation of the machine, the water has always adhered to the ink fountain roller, causing the original oil-fighting ink fountain roller to repel the ink because of the water film on its surface. This situation is usually caused by improper pressure adjustment of the water roller or ink roller, or the water volume is too large, and the water returns to the ink fountain along the reverse ink path. At this time, it is necessary to readjust the pressure of the water roller and the ink roller, or to reduce the amount of water while ensuring that the plate will not be pasted.
2 Ink flow is too poor
We have used inks provided by many domestic ink manufacturers, and their flow properties vary greatly. When printing, we must make timely judgments and adjustments according to the inks provided by different businesses and the color samples of the newspapers in the production process. In addition, it is necessary to pay attention to the operation of stirring ink frequently to enhance its fluidity.
3 Impact of paper
Papers produced by different manufacturers have different binding materials and fillers, and different processing methods, resulting in great differences in technical indicators such as smoothness and tensile strength. Newsprint itself has poor paper quality, and it is easy to lose paper dust and pull paper hair during printing. In some pictures and advertisement layouts with large ink consumption, these paper powders pass through the printing plate, relying on the plate ink roller and the ink transfer roller, and return The ink fountain roller is blocked in the gap between ink fountains, which causes the ink to not go down. In this case, the ink fountain needs to be cleaned frequently.
4 Improper installation and adjustment of ink fountain mechanism
The ink fountain mechanism contains many small links. Improper installation and adjustment may cause the entire ink fountain not to emit ink or the ink output volume is too large. This situation is easier to adjust and will not be detailed here. I will talk about two cases of poor ink placement due to improper installation and adjustment.
1) Improper installation of stepper motor
Many printing presses now use a central console to control the stepping motor mounted on the ink fountain to adjust the ink. There is a gap at the front end of the stepper motor. The correct installation is that the gap should hook the swing lever mechanism that adjusts the gap of the ink fountain. If the stepper motor is not hooked but the swing lever mechanism is directly pressed, this is equivalent to keeping the position always closed, no matter how the console is opened, no ink will be emitted. Stepper motor is removed and re-installed correctly.
2) Uneven adjustment of ink fountain blade
This situation is rare, but it is also the least likely problem. The adjustment of the ink fountain blade often leads to changes in the ink output of the entire ink fountain, and the ink fountain gap itself is small. It is difficult to judge whether the gap between the entire ink fountain blade and the ink fountain roller is consistent with our naked eyes and experience. Several adjustment screws have inconsistent adjustments. It may cause a certain part of the ink fountain blade to protrude slightly and the gap with the ink fountain roller becomes small or even no gap. This will also cause that no matter how far it is opened on the console, this part will not be filled with ink. At this time, it is necessary to readjust the ink fountain blade and readjust each stepping motor so that the gap between the entire ink fountain blade and the ink fountain roller is consistent.
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