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First, the outlet is blocked
The clogging of printed dots is relatively common, and there is a certain relationship between dot clogging and printed plates. When making a printing plate, the line numbers of the anilox roller and the printing plate do not match, and if it is made too high, the plate jam phenomenon will occur. Generally, the ratio of the anilox roller to the printing plate is 1: 4.5, which means that the anilox roller is 250 mesh, and if the anilox is 65 lines, the dot printing jam will occur.
Second, printing dew
The printing plate hardness is higher than 45 degrees, when printing large color blocks, it is very easy to appear printing. If the hardness of the printing plate is too high, the ink transferability of the printing plate will be reduced. That is, the amount of ink used is directly reduced, resulting in the paper not being able to obtain sufficient ink coverage, causing printing whiteness.
3. Incorrect registration
In the production process of the printing plate, the wrong scaling or the bleeding of the printing plate will also cause inaccurate registration. The scaling of the printing plate is calculated according to the circumference of the printing press cylinder. If the calculation is wrong, the size of the pattern will change causing inaccurate color registration.
Fourth, the printing is not clear
Unclear printing is mainly reflected in whether the printed pattern has been printed, or some has been printed. This is mainly due to the poor flatness of the printing plate during the plate-making process, and the phenomenon of high and low levels appears. . This kind of situation generally occurs only when the back of the printing plate is raised with tape to make the printing surface smooth.
V. Printing ghosting
The printing ghosting caused by the printing plate is mainly due to the fact that the edges of the printing plate are not smoothed during the printing process, which causes the printing quality problems caused by the squeezing of the printing plate. Version.
Six, printing errors
In the cardboard process, errors occur in the content of printed patterns. The most common are text errors and fewer printed patterns. Solving this type of method can only rely on improving the carton inspection ability of the printing press personnel.
7. The position of the printed version is incorrect
The incorrect position of the printing plate is mainly caused by human factors. During the production of the printing plate, the layout position was not placed according to the specified position, which caused the printing position to be incorrect. Solving such problems requires printer personnel to carefully check the printed manuscript.
Eight, printed text paste
There is a similarity between the printed text and the unclear, but the most common cause here is the problem of the plate making process, especially when the text is relatively small, the printing plate is too shallow when the plate is washed, and the ink will accumulate after printing At the printing edge, it is easy to block the printing plate, resulting in slurred printed text. Once such problems arise, they can only be solved by re-creating the printed version.
Summary: formulate reasonable print version management methods to avoid quality problems
Of course, the problems caused by the printing plate are far more than these. For example, if the printing plate is too soft, the printing paste will be blurred or unclear, and the printing plate wear will also cause other problems. Therefore, the quality of the printing plate is directly impressed by the printing machine production. Efficiency and quality. In order to avoid similar quality problems, each factory must formulate reasonable printing plate management methods to avoid unnecessary problems caused by the quality problems caused by the printing plate!
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