Scraping knife selection, installation. High speed gravure printing machine, generally use imported high elasticity of steel ink scraper, its thickness of 150 ~ 180μm. When installing the scraper, pay attention to the two sides of the scraper to be longer than the printing plate 10 ~ 20mm to avoid printing plate ink splash on the cots. Reasonable adjustment of scraping knife. The pressure, sharpness and contact position of the scraper have an impact on the printing quality. This article will introduce the principle of using the scraper for you
Such periodic fluctuations, not only will bring a certain impact on the plate roller base, the impact on the scraping knife is also very obvious, a long time of vibration will make the scraping knife scraping ink is not clean, resulting in dirty version phenomenon. By increasing the pressure of the scraping knife, the problem can be solved in a short term, but the problem can not be solved fundamentally, and the service life of the scraping knife will be significantly affected.
The polishing quality of the surface of the plate roller is mainly reflected in the number of burrs around the mesh hole. Good quality plate roller layout clean, no burr, net hole is clear and no impurities inside. In this way, in the printing process to ensure that the plate roller will not damage the ink scraper. After the frequent replacement of the ink scraper, if there are still knife lines on the printing, in general, it can be identified as the plate roller polishing quality problems.
Pressure imported from Japan ADL ink scraper, Japanese ADL ink scraper pressure factors are the size of cylinder pressure, the difference between hard and soft blade, ink scraper and printing plate cross Angle, the greater the slope, the greater the pressure. Excessive pressure will reduce the transfer rate of ink, printing plate, blade wear; Too small pressure is prone to dirty version or scraper line. The sharpness of the knife depends on whether the knife is new, the Angle of the blade when the knife is sharpened, the type of sandpaper (whetstone) used, etc.
Post time: Aug-14-2021