Squeegee pressure, sharpness, contact position with the plate, etc. have an impact on print quality. According to actual needs, rational adjustment of these factors can solve many problems in printing.
Pressure
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.
2. The sharpness of the knife
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.
3. The distance between the squeegee and the printing 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.
4. The flatness of the knife
The flatness and warpage of the knife depends mainly on the method of installation. Of course, it may also be related to the presence of foreign matter on the blade holder or on the blade or lining.
When the flatness of the knife is poor, some watermark marks may appear on the edge of the printing surface, or some intermittent line marks may appear from time to time. Some people think that the ink is rough and the ink fluidity is not good. This phenomenon may occur. In fact, this condition may occur even if the knife is uneven.
5. Squeegee movement
Squeegee knife left and right moves to reduce the scraper line, improve scraper utilization, reduce the wear of the plate has an important role. If the squeegee does not move properly, you should think of ways to improve it.
When the line marks appear in the printing, the first is to cause an edition injury, and the second is that the scraper is not sharp. However, another reason is that foreign objects stick behind the blade. The solution is to move the squeegee up and down so as to get rid of the adhesive. If it cannot be removed, the wiper can only be wiped off.
Another problem is related to the scraper, and many people misunderstood that it is caused by the ink. This refers to the occasional irregularity of dozens of line marks of varying lengths. It looks like the ink is piled up. It is different from the squeegee line. It is not continuous, but sometimes it is not. This is actually a squeegee. The pressure is too small or the blade is not sharp enough.
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. For example, when there are some intermittent ink lines, it is possible to increase the pressure and solve it by sharpening the knife; when a more serious dirty plate occurs, several aspects need to be combined to use it; one must use sharp blades, two To increase the pressure, it is necessary to increase the distance between the blade and the contact surface.
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.
Pressure
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.
2. The sharpness of the knife
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.
3. The distance between the squeegee and the printing 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.
4. The flatness of the knife
The flatness and warpage of the knife depends mainly on the method of installation. Of course, it may also be related to the presence of foreign matter on the blade holder or on the blade or lining.
When the flatness of the knife is poor, some watermark marks may appear on the edge of the printing surface, or some intermittent line marks may appear from time to time. Some people think that the ink is rough and the ink fluidity is not good. This phenomenon may occur. In fact, this condition may occur even if the knife is uneven.
5. Squeegee movement
Squeegee knife left and right moves to reduce the scraper line, improve scraper utilization, reduce the wear of the plate has an important role. If the squeegee does not move properly, you should think of ways to improve it.
When the line marks appear in the printing, the first is to cause an edition injury, and the second is that the scraper is not sharp. However, another reason is that foreign objects stick behind the blade. The solution is to move the squeegee up and down so as to get rid of the adhesive. If it cannot be removed, the wiper can only be wiped off.
Another problem is related to the scraper, and many people misunderstood that it is caused by the ink. This refers to the occasional irregularity of dozens of line marks of varying lengths. It looks like the ink is piled up. It is different from the squeegee line. It is not continuous, but sometimes it is not. This is actually a squeegee. The pressure is too small or the blade is not sharp enough.
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. For example, when there are some intermittent ink lines, it is possible to increase the pressure and solve it by sharpening the knife; when a more serious dirty plate occurs, several aspects need to be combined to use it; one must use sharp blades, two To increase the pressure, it is necessary to increase the distance between the blade and the contact surface.
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.
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