Correct selection and use of squeegee is crucial

Before installing the squeegee, both the new blade and the old blade should be ground to ensure that they are not nicked and burr-free. The angle of the edge is preferably 25°. Our factory usually puts a few drops of engine oil on the whetstone for coarse grinding, and then uses 1000# water-resistant emery cloth to add a few drops of engine oil for fine grinding. Adding a few drops of oil can play a role in lubrication, reduce friction, grinding results are generally good, peers may wish to try. Most printing companies often encounter the phenomenon of ink color or light or dark, especially when printing screen printing products. In addition to the ink transferability, the angle between the squeegee and the plate cylinder can not be ignored. Most gravure presses can choose from 45° to 65°. The angle is small, the color of the printing ink layer is deep, and the gloss is good, but the effect of scraping ink is poor, and the scraping is not easy and the graphic and text are blurred. However, if the angle is too large, the ink may not be transferred in the shallow part of the web, and the main pattern such as a hatched pattern will appear, but the shadow will not be printed. The solution is to adjust the position of the squeegee and increase the position of the tool holder so that the ink is completely transferred to the substrate. To adjust to the best angle, consider the depth of the cell, the position of the doctor blade, and the printing speed. The net depth is too deep and the angle should be larger. The squeegee pressure will also have a very important influence on the quality of the printed product. The pressure can be adjusted according to the depth of the cell and the graphic level. If the plate cylinder is too long and it is corroded, the pressure applied will be greater. Because the depth of the etched gravure mesh is deep, the edges of the pattern are prone to burrs. However, if the pressure is too high, it is easy to scrape off the ink from the shallow cells, resulting in partial printing on the shallow screen. Moreover, the excessive pressure will make the contact angle smaller, making it difficult to clean the excess ink on the plate, causing the ink under the blade to accumulate. Knife line. Under normal circumstances, a good working squeegee system with a contact angle of about 60° is appropriate