The different effects of the squeegee have different effects on the quality of the print. The squeegee has pressure, sharpness, contact position with the plate, etc. He will have an impact on the print quality. According to actual needs, rational adjustment of these factors can solve many problems in printing.
Let's take a look at the different effects of the squeegee.
Let's first look at the pressure effect of the squeegee. The factors affecting the squeegee pressure are the size of the cylinder pressure, the difference between the hard and soft blades, the angle at which the squeegee crosses the plate, etc. The greater the slope, the greater the pressure. Excessive pressure will reduce the transfer rate of the ink, and the wear of the printing plate and the blade will be large. If the pressure is too small, the dirty plate or scraper line may occur.
The sharpness of the squeegee. The sharpness of the knife depends on whether it is a new knife, the angle of the knife when sharpening, the type of sandpaper (oil stone) used, etc. The suitable sharpness of the knife should be to both effectively scrape the ink without producing a knife. Sharp blades are often prone to knife marks and wear plates.
The distance between the squeegee blade and the plate. The reduction of the distance between the doctor blade and the printing plate is beneficial to increase the ink transfer rate, but it is easy to produce a dirty plate; on the contrary, it can effectively solve the dirty plate and avoid some small line marks, but it will reduce the ink transfer rate.
Several indicators of the above scrapers have both differences and similarities. When solving specific problems, one of them can be used, and sometimes it is necessary to use them comprehensively to solve the problem completely. When the blade wear is severe and sandpaper and oilstone cannot be used for grinding, special grinding machines can be used for grinding, which can be reused several times, greatly reducing the cost of the squeegee.