After installing the doctor blade on the printing machine, do not let the doctor blade rub against the mesh roller that has not been moistened with ink before the formal printing. Otherwise, the scraper and mesh roller are likely to be completely damaged. The doctor blade pressure of the doctor blade should be adjusted from small to large. Do not use a large doctor blade pressure at the beginning, and don’t pay too much attention to the so-called standard doctor blade pressure. As long as the doctor blade effect is clean, there is no need to increase the doctor blade pressure. It is easy for an experienced printing press operator to judge.