If you don't want to have trouble with Paper Gift Pack printing, you have to deal with the problem of the squeegee first!

If you don't want to have trouble with Paper Gift Pack printing, you have to deal with the problem of the squeegee first!

Although the squeegee is very inconspicuous, it has a crucial impact on the product quality for high-precision ink color printing technology. The pressure, sharpness, and contact position of the squeegee have an impact on the printing quality. According to actual needs, reasonable adjustment of these factors can solve many Paper Gift Pack printing problems.

The squeegee is well used, it can ensure that the anilox roller is supplied with a uniform amount of ink, so as to print the products we expect. If it is not used well, it is easy to cause defects such as line marks, color difference, and jamming on the surface of the printed matter. Therefore, it is crucial to understand how squeegees work and how to use them properly.

1. 5 important indicators when using a scraper

The pressure, sharpness of the scraper, and the contact position with the plate all have an impact on the printing quality. According to actual needs, reasonable adjustment of these factors can solve many Paper Gift Pack printing problems.

1. Pressure: The factors that affect the pressure of the squeegee are the size of the cylinder pressure, the difference between hard and soft blades, the angle of the squeegee and the Paper Gift Pack printing plate crossing, etc. The greater the inclination, the greater the pressure. Excessive pressure will reduce the transfer rate of the ink, and will cause greater wear on the printing plate and blade; if the pressure is too small, dirty plates or scraper lines will occur easily.

2. The sharpness of the knife: The sharpness of the knife depends on whether it is a new knife, the angle of the blade when sharpening the knife, the type of sandpaper (oil stone) used, etc. The appropriate sharpness of the knife should be such that it can effectively scrape the ink without producing filaments. Squeegees that are too sharp tend to produce wire marks and wear out the Paper Gift Pack printing plate at the same time.

3. Scraper gap: The scraper contacts the anilox roller. When the gap between the scraper and the anilox roller is tight, the ink volume of the anilox roller will decrease, which will affect the ink transfer amount of the Paper Gift Pack printing plate.

4. Flatness of the knife: The flatness and warpage of the knife mainly depend on the installation method. Of course, it may also be related to the foreign matter stuck in the groove of the knife holder or on the blade and lining.

When the flatness of the knife is poor, some water drop marks will appear on the edge of the printing surface, or some intermittent line marks will appear from time to time. Some people think that the above phenomenon occurs when the ink is rough and the ink fluidity is not good. In fact, this situation can also occur when the knife is not flat.

5. Movement of the squeegee: The left and right movement of the squeegee plays an important role in reducing the squeegee line, improving the utilization rate of the squeegee, and reducing the wear of the plate. If the squeegee does not move normally, you should find a way to improve it.

2. Line marks appear in Paper Gift Pack printing, which may be related to the scraper

The reasons for the line marks in printing are that one is the plate damage, and the other is that the scraper is not sharp. However, another reason is that there is a foreign object stuck behind the blade. The solution is to move the squeegee back and forth up and down to get rid of the sticky substance. If it cannot be thrown off, you can only stop and wipe the squeegee.

Another problem is related to the squeegee, and many people misunderstand that it is caused by the ink. This means that there are sometimes dozens of irregular line marks of different lengths, which look like they are piled up with ink. It is different from the scraper line, which is not continuous, but sometimes absent. This is actually a scraper. The pressure is too low or the scraper is not sharp enough.

3. What should we do when solving specific problems?

The above indicators of the scraper have both differences and similarities. When solving specific problems, one of them can be used, and sometimes comprehensive use is required to completely solve the problem. For example, when there are some intermittent ink lines, it can be solved by increasing the pressure or by sharpening the knife; when there is a more serious dirty version, it needs to be used in combination; one must use a sharp blade, two To increase the pressure, the third is to increase the distance between the scraper and the contact surface.

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