Not only did the scraper not be respected, but it also blamed many problems that were not caused by it. If streaks appear on the print, blame is placed on the scraper. Similarly, if the ink on the print is uneven, it also pushes the responsibility to the scraper. Whether the printing ink is too light or dark, and whether the dots are too small or too big, the scraper is inevitably the scapegoat.
It is undeniable that the scraper is in a dirty and dirty environment. But as the old saying goes: "There must be someone doing it." And the fact is that the squeegee may cause any of the above problems or all of the problems. However, the question is: How far can you let the scraper take on all the accidents? More importantly, no matter what causes these problems, what can you do to correct these problems?
In order to determine where the failure occurred, everything that was taken was often an easy test. Unfortunately, there are very few printing manufacturers applying this test. Whenever you encounter a printing failure, the first step you should take is to perform this test, rotating the squeegee on the press and printing several patterns without adjusting any other parameters. Because this is not the same thing as thoroughly testing a new screed, it is automatically changing a few other parameters.
If a standard squeegee with two blades at each end is used, the printed image may or may not change when the blade corresponding to the blade is printed. If the image changes, whether it is good or bad, then the problem encountered must be caused by the blade in front of the squeegee because it is almost impossible to get the same streaks or defects with two different squeegee blades in the same position. . On the other hand, if the rotating squeegee has no effect and the image shows the same problem in the same position as before, there is no reason to blame the squeegee (unless, of course, it makes you feel good).
There are many boring explanations about the root cause of image defects. The explanations seem to be that the sensation is, and the effect is like a scraper blade problem, although they are not. In the presence of streaks, the stripes appear as unneeded fine parallel lines on the print, in the order of arrogance and smallness of the appearance of stripes, due to:
â— There is a gap in the ink plate.
The scraper drags debris and ink particles and embeds them in the screen.
â— The emulsion is not coated and the screen is damaged and streaks are produced.
â— The ink plate dripped the ink in front of the scraper (especially in the location, the color density changed, the possible causes are:
â— The printing platform is uneven, high or low.
â— uneven blade pressure.
â— Failed to evenly place the scraper in the scraper clamp (not vertical along its length).
â— Uneven screen tension.
The solution to these imaginary squeegee problems is obvious. Do not sand the squeegee as soon as you see it. Use common sense methods to avoid problems. This method should include the following points:
â— Clean the ink pad and store it well. At the same time, the corners of the flushing chamber are not suitable for storing scrapers or ink plates.
â— Keep the workshop clean and tidy, use a clean ink container.
â— Clean the screen and clean the edges of the coating tank. Do not use scratched ink or squeegee printing even if the image looks good. The template does not help when there is a problem with the image.
â— Avoid applying ink and squeegee wet.