The relationship between the sharpest knife line a

2022-08-07
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Relationship between knife line and ink particle size

the thickness of ink particles is closely related to the generation of knife line. The thinner the ink, the better the print quality, and the corresponding reduction of knife line and probability. There are strict requirements on the particle size of the ink. Generally, the ink fineness is required to be 15um. If the ink fineness fails to meet the requirements, the rough particles will jack up the scraper, resulting in knife lines. At the same time, too rough ink particles will cause great damage to the scraper and fiber-reinforced plastic plates. The ink thickness should be moderate, and too fine is not good

causes and solutions of plastic gravure printing knife line

after long-term observation of this kind of knife line, it is found that the direction of knife line caused by rough ink particles on printed products is also different, mainly in three forms

1. The first kind of knife line has irregular knife lines of different thickness on the printed matter. This kind of knife line extends from the printed pattern part to the place without pattern. The blade line is long, and with the left and right swing of the doctor blade, the blade line also moves, sometimes one, two, sometimes many. The solution is to adjust the position of the doctor blade up and down to make the car more beautiful. At the same time, you should observe whether the color depth of the printed product is out of shape

2. The second kind of blade line has a regular trend. It appears in the printing pattern part of the same plate, and it is in the same position. With the left and right swing of the doctor blade, there is basically no big change. This is because the coarse particles in the ink push up the doctor blade, and the left and right swing of the doctor blade can not drive it. If it appears in the middle color, the next color of ink will fill these blade lines, That is to say, the first batch of fdme based polymers produced by DuPont company are the next color inks of polybenzofuran 2 carboxylate (PTF) at the knife line

3. The third kind of knife line is easy to appear on the last color. When printing in the plastic film, it usually appears on the white plate. Such one or two knife lines will run through the whole print. When viewed from the front of the print, if the maximum load recorded by the knife line is not rough, it is not easy to find it. When viewed from the back of the print, you can find the marks formed by the knife line throughout the print. This kind of marks will appear undoubtedly when compounding, especially in the composite aluminum coating, It can be seen more clearly

no matter what kind of knife line above, the solution is to stop printing and filter the ink. Usually, the ink used in the first and second colors is filtered before printing on the machine. 140 mesh metal screen is selected for filtering. After long-term practice, it has achieved initial results, which is worth learning and reference from peers

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