In the printing industry, many enterprises in the printing process, the printing quality of products will always appear such or such quality problems, but sometimes it is not clear which link is the problem, what factors affect the printing quality? Today, this paper summarizes several main influencing factors for the printing quality problems that often occur.
1, blocking version
The blockage of dots will cause the transfer of ink to decrease, and the color of printed matter will change. When blockage occurs, the printing plate should be cleaned with solvent or special cleaning agent, and corresponding measures should be taken for the causes of blockage.
2. Plate Wear
Printing plate wear will make dots smaller and shallower, thus affecting the ink load of dots. As a result of plate wear, the overall color becomes lighter. Sometimes the white plate wear makes the ink on the white ink insufficient, and the covering power of the base material is insufficient. At this time, the production should stop and change the plate, and the old version should be re-plated. If the plate drum can not be stripped due to the collapse of the transition screen wall, the plate should be reproduced.
3. Inconsistent pattern color
When multiple patterns are arranged horizontally at the same time, the color difference between the left and right sides of the plate may occur. In the process of plate making, especially when full plate is on the spot, it is easy to change the dot size from left to right. Therefore, attention should be paid to checking the printing effect difference between the left and right ends of the plate drum.
4. Rationality of plate design
In the process of plate design, the influence of plate design on printing process and post-press processing should be fully considered. For example, about 80% and 5% of the color of the jumping area of the dots are easy to be graded, so we should take measures to change it in advance.
5. Printing environment factors
If the room temperature of the printing workshop changes dramatically, the flow state of the ink will change. In general, the temperature and temperature of production workshop are controlled at (23 +5) Celsius and 60%+5% humidity. In addition, when using ink in winter, it should be preheated in advance to increase the fluidity of ink.
6. Printing Conditions
When the layout is blown by irregular wind, the change of printing speed and drying speed will lead to the change of the color of the printed matter. These factors should be fully taken into account in the printing process.
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