Influence of scraping pressure and speed on printing quality
The scraper contacts the disc surface under certain pressure and should be in linear contact.The printing press is too small, less than the surface of the disc, or printing surface is not complete, the printing press is too large, will speed up the scraper, screen plate wear, the occurrence of mesh and split plate damage, affecting the quality of printing.At the same time, the larger the ink under the ink, ink waste and more difficult to dry.
Scraper in the scratch printing, ink uniform displacement and make the whole picture and text through the ink.The speed of scraping printing ink transfer and the uniformity of the quality of graphics and text have a certain impact.If the speed of scraping is fast or slow, the ink strip will be produced.The speed is too slow, the image and text edge will have ink penetration, resulting in the expansion of the image and text, the speed is too fast, there will be part of the image and text ink quantity.
Maintenance of scraper
In order to get a good printing effect, it is necessary to ensure that the blade of the scraper is clean.
After stopping printing, use a dust-free cloth with an appropriate amount of solvent to gently wipe off the remaining ink on the squeegee.Do not use the ink is a scraper glue scraping on the ink, so as not to damage the edge.Do not leave residual ink on the scratch to make it crust.
Clean the squeegee after use will be cleaned scraper placed for a certain time, this will help the squeegee shrinkage recovery, the surface of the solvent volatilization, can extend its service life.
Due to the contact between the scraper and the screen line during printing.Relative motion produces friction, after printing a certain amount, the scraper is bound to wear, but also due to the impact of the scraper scar.Will affect the quality of printing, printing surface streaks.In order to get a good printing effect, it is necessary to ensure the accuracy of the squeegees, timely check the squeegees, replace the squeegees, the factory can use grinding method to restore the squeegees accuracy, in order to reduce the production cost.