At present, packaging carton printing is booming, and customers' requirements for product quality are becoming higher and higher. How to improve the printing quality of carton has become the goal that enterprises continue to pursue. Here are some important tips in the beautiful printing process of carton.
Techniques for flexo printing on low-gloss paper:
When using low-grit base paper as corrugated cardboard surface paper, the corrugated cardboard surface will show signs of corrugation. It is easy to cause the obvious flute and the required graphic content cannot be printed in the low concave of the flute. For the uneven surface of the corrugated cardboard caused by the flute, a flexible resin plate with better resilience should be used as the printing plate to overcome the printing failure. Clear and uncovered defects. Especially for A-type corrugated board produced from low-granularity paper, printing by a printing machine will cause great damage to the flat compressive strength of the corrugated board. In addition, after the corrugated board passes through the printing roller and the embossing roller, its edge pressure strength will also be There is greater damage.
If the surface rick degrees of the corrugated cardboard are too different, it is easy to cause the corrugated cardboard produced by the corrugated cardboard line to warp. The warped cardboard will cause overprinting and printing slotting irregularities to the printing, so the warped cardboard should be flattened before printing. If the corrugated cardboard is forced to be printed unevenly, it is easy to cause the rule. It will also cause the thickness of corrugated cardboard to decrease.
Troubleshooting techniques for printing color difference in the same batch of cartons:
In one production, the single-sheet color registration of the printed products appeared accurate in the printing process of the four-color machine, but the entire batch of printed products had inconsistent specifications, which made post-processing impossible. The cause of the problem is as follows.
The height of the front gauge is not suitable. In the pre-regulation position, generally 3 sheets of printed paper are stacked together under the pre-regulation, so as to feel the pressure of the pre-regulation when twitching, and the paper can twitch freely. Higher or lower pre-regulation will result in inaccurate paper positioning, and of course the product specifications will not be consistent after printing.
The side positioning is not accurate, which includes the height of the side pressure plate and the pulling force of the paper roll. If the height of the paper pressing board and the pulling force of the paper pulling roller are not appropriate, either the paper cannot be pulled in place or the head is pulled too far, resulting in an inaccurate position on the side of the paper. In general, the height of the side gauge paperboard should be 3 times the thickness of the printed paper, and the side gauge pull paper distance is preferably 5 ~ 8mm.
Adjusting skills of carton printing pressure:
The adjustment of the printing pressure is suitable for the ink to be uniform and moderate, the ink trace is clear, the ridge surface of the tile is not depressed, flat and not deformed.
Once the pressure is determined, do not adjust it casually. Printing inking pressure Printing inking pressure is the pressure between the anilox roller and the printing plate. Its main function is to evenly transfer the ink from the anilox roller to the printing plate. In actual operation, the influence of the printing plate inking pressure on the printing quality is very important. If the inking pressure is too heavy, the printing plate is easy to insert ink, which affects the quality of the product and also affects the printing durability of the printing plate. , The printing plate can not be printed without ink. Therefore, attention should be paid to the adjustment in the printing process to ensure that the printing can be carried out smoothly.
Flexo printing techniques for different smoothness of cardboard paper:
When printing on raw paper with rough surface and loose structure, the ink permeability is large, and the printing ink dries quickly, while printing on paper with high surface smoothness and dense fiber toughness, the drying speed of the ink is slow. Therefore, the amount of ink application should be increased on rougher paper, and the amount of ink application should be reduced on paper with a smooth surface. Printing ink on paper without sizing dries quickly, and printing ink on paper with sizing dries slowly, but the reproducibility of the printed pattern is good. For example, the coated whiteboard paper has lower ink absorption than boxboard paper and teaboard paper, and the ink drying is slower, and the smoothness is higher than that of boxboard paper, liner paper, and teaboard paper. Therefore, the resolution of printing small dots on it The rate is also high, and the reproducibility of its patterns is better than that of lined paper, cardboard paper, and tea board paper.
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