Generally speaking, in the case that the flexo printing unit is sufficient, the same color of the screen and the solid version should be divided into two, because the screen printing requires a thinner ink layer, while the field and line versions need to be thicker. The ink layer. However, in some special cases, it is necessary to make the same color of the network cable and the field image to the same version. In this case, on the one hand, in the printing, the choice of anilox roller should be compromised, usually it is preferred to meet the printing requirements of the screen version, at the expense of the thickness of the solid ink layer, on the other hand, at the time of plate making, Master different exposure times to ensure the quality of the same plate and the field. The difference between the image part of the network line and the part of the field is mainly due to the different depth of corrosion. In order to "stay" in the process of brushing the printing plate, the part of the wire needs to have a strong foundation, so the corrosion depth is shallower. Different corrosion depths can be obtained with different back exposure times by masking the local method. The front exposure time should also be done in a similar way, but it is said that the current flexographic plate manufacturer has introduced a new type of flexible plate, regardless of whether the printed part is a cable or a field, this plate only needs a uniform front exposure. Time, avoiding the trouble of multiple exposures, making flexo plate making more convenient, this article will introduce you to the adjustment technique of the doctor blade.
Such periodic fluctuations not only have a certain influence on the plate roller base, but also the effect on the doctor blade is very obvious. The long time vibration will make the doctor blade scrape dirty, resulting in dirty version. A phenomenon occurs. By increasing the pressure on the doctor blade pressure, the problem can be solved in a short period of time, but the problem cannot be solved fundamentally, and it also has a significant impact on the service life of the doctor blade.
The polishing quality of the surface of the plate roller is mainly manifested by the number of burrs around the cell. The good quality plate has a clean, no burr, and the cells are clear and there are no impurities inside. This ensures that the plate roller does not damage the doctor blade during the printing process. After the squeegee is frequently replaced, if there is still a ruled line on the printed product, it can be generally determined that there is a problem of polishing quality of the plate roll.
This cut line is generally a dark line, sometimes not. It is more common to use gold ink to print solid color blocks. Since gold ink is prepared by using gold powder, gold oil and solvent, the metal particles are relatively heavy and easy to precipitate. If the solvent used is poor in solubility, plus stirring. Sufficient, metal particles will accumulate due to uneven distribution. If it is stuck at the edge of the doctor blade, a thicker dark line is formed. The characteristic of this dark line is that it disappears automatically after a period of time and then forms, which seriously affects the quality of the printed matter. This kind of cut line is difficult to eliminate in printing. It is necessary to start from the root cause to prepare for the work before printing. When mixing the ink, use a suitable solvent, fully stir to fully dissolve it, and keep the ink in good circulation during printing.
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