In packaging printing, flexographic printing corrugated board is becoming more and more widespread. Water-based ink is one of the commonly used environmentally-friendly inks, and the printability of corrugated paperboard is also relatively good. Therefore, the application in corrugated board printing has also increased significantly. But the corrugated board surface is poor in smoothness and requires a higher printing pressure. The flexographic printing is called kiss printing. The control of the printing pressure is very strict. In addition, the water-based ink itself has a slow drying, and it will precipitate after long-term storage. The characteristics, as well as the paper surface smoothness, elasticity, moisture content and surface acceptability performance requirements, making the corrugated board flexible version of the water-based ink printing technology than the ordinary paper printing is much higher.
We know that the key factors affecting the quality of printed products are equipment, raw materials, people and the environment, as well as corrugated board printing. Therefore, in order to guarantee the printing quality, it is necessary to ensure that the raw materials are qualified, the equipment is operating normally, the environment meets the requirements, the operator's technical level is high, and the production practice experience is rich.
According to the production practice and the experience of some experts, to ensure the quality of flexo printing of water-based inks on corrugated board, special attention should be paid to the following points:
1. Pay attention to the clarity of printed graphics;
2. To ensure that the printing color is pure, the batch product has no color difference;
3. Keep the ink color consistent with the same batch of printing;
4. When printing coated white cardboard boxes, be careful not to have ghosting;
5. To ensure the accuracy of various colors overprint;
6. Pay attention to the effect of carton strength on full-printing;
7. For the missed version, it must be printed in time;
8. Note the printing of thin cardboard;
9. To warpage cardboard to prevent running version, slotted go;
10. In flexo printing, pay attention to cover the background color;
11. Attention should be paid to the observation during printing, and problems should be eliminated in time.
In addition, it is necessary to pay attention to the exclusion of some faults in printing. As there are many factors that affect the quality of water-based ink flexographic printing of corrugated board directly, it is easy to cause printing problems and bring quality problems. Therefore, in the troubleshooting, must be based on the characteristics of equipment, materials, water-based ink, observation and analysis, to eliminate the disease.
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