Flexo Technology: Four Corrugated Box Printing Tips

Flexo Technology: Four Corrugated Box Printing Tips

At present, packaging carton printing is booming, and customers' requirements for product quality are getting higher and higher. How to improve the printing quality of carton boxes has become the goal that enterprises continue to pursue. Here are some important tips in the fine printing process of carton boxes.

Flexo printing techniques for low-gram surface paper:

When using low-gram base paper as corrugated cardboard face paper, there will be a problem that corrugated cardboard is exposed on the surface of corrugated cardboard. It is easy to cause corrugation and the required graphic content cannot be printed in the low concave part of the corrugation. For the uneven surface of the corrugated cardboard caused by the corrugation, a flexible resin plate with better resilience should be used as the printing plate to overcome the printing inefficiency. Clear and revealing flaws. Especially the A-type corrugated cardboard produced with low-gram paper, the flat pressure strength of the corrugated cardboard will be greatly damaged after printing by the printing machine. There is greater damage.

If the surface Rick of corrugated cardboard is too different, it is easy to cause the corrugated cardboard produced by the corrugated cardboard line to warp. Warped cardboard will cause inaccurate overprinting and misalignment of printing grooves to printing. Therefore, warped cardboard should be flattened before printing. If the uneven corrugated cardboard is forcibly printed, it is easy to cause irregularities. It will also cause the thickness of corrugated cardboard to decrease.

Troubleshooting skills for chromatic aberration in the same batch of carton printing:

In one production, there was a problem that the color registration of the printed product sheet was accurate during the four-color printing process, but the specifications of the entire batch of printed products were inconsistent, which made the post-processing impossible. The cause of the problem is analyzed as follows.

The height of the front gauge is inappropriate. When the front gauge is positioned, generally 3 sheets of printed paper are stacked together and stuffed under the front gauge, so as to have the feeling of pressing the paper by the front gauge when twitching, and the paper can be twitched freely. If the front gauge is too high or too low, the positioning of the paper will be inaccurate, and the specifications of the printed products will of course be inconsistent.

The position of the side gauge is not accurate, which includes the height of the side gauge pressboard and the pulling force of the pulling paper roll. If the height of the pressing board and the pulling force of the paper pulling roller are not suitable, the paper is either not pulled in place or pulled too far, resulting in inaccurate positioning of the paper side. Under normal circumstances, the height of the side gauge pressboard should be 3 times the thickness of the printed paper, and the distance between the side gauge and the paper should be 5-8mm.

Adjustment skills of carton printing pressure:

The adjustment of the printing pressure is that the ink is even and moderate, the ink marks are clear, the tile edge surface has no depression, and the flat surface is 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, and its main function is to evenly transfer the ink of the anilox roller to the printing plate. In actual operation, the influence of printing plate inking pressure on printing quality is very important. If the inking pressure is too heavy, the printing plate is easy to embed ink, which affects the product quality and also affects the printing durability of the printing plate; if the inking pressure is too light , if the printing plate is not inked, it cannot be printed. Therefore, attention should be paid to adjustment during the printing process to ensure that the printing can be carried out smoothly.

Flexo printing skills of containerboard paper with different smoothness:

When printing on base paper with rough surface and loose structure, the ink has high permeability and the printing ink dries quickly, while printing on the paper with high surface smoothness, dense and tough fiber, the drying speed of the ink is slow. Therefore, on rougher paper, the amount of ink applied should be increased, and on smooth-surfaced paper, the amount of ink applied should be reduced. The inks printed on unsized paper dries quickly, while those printed on sized paper dries slowly, but the reproducibility of the printed pattern is good. For example, the coated whiteboard paper has less ink absorption than boxboard paper and teaboard paper, the ink dries slowly, and the smoothness is higher than that of boxboard paper, liner paper and teaboard paper. Therefore, the resolution of fine dots is printed on it. The rate is also high, and the reproducibility of its pattern is better than that of linerboard, boxboard, and teaboard.

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