How to adjust the ink flexo printing process when the carton paper is different

Common base papers used for corrugated box paper are: cardboard, liner paper, kraft paper, tea board paper, white paper and single-sided coated white paper. Due to the difference in the papermaking process a papermaking material and each of the base paper, the base paper causes the above several physical and chemical indicators, surface properties, and printability are quite different. The following is a discussion of the problems caused by the above-mentioned paper products for the printing and printing of corrugated cardboard.

First, the problem caused by low gram base paper

When using corrugated cardboard paper with low gram base paper, there will be defects in the surface of corrugated cardboard. It is easy to cause obviousness and can not print the required graphic content in the low concave of the enamel. The surface of the corrugated cardboard caused by the exposed enamel is not flat. The flexible resin plate with better resilience should be used as the printing plate to overcome the printing. Clear and flawed defects. In particular, the A-type corrugated cardboard produced by the low-gram paper will be greatly damaged by the printing machine printing, and the compressive strength of the corrugated board will be greatly damaged after the printing roller and the embossing roller. There is a big damage.

If the surface gram of the corrugated board is too different, it will easily cause the corrugated board produced by the corrugated board to warp. Warped cardboard will cause overprinting and printing slotting on the printing. Therefore, the warped cardboard should be flattened and then printed. If forced printing of uneven corrugated cardboard is easy to cause walking. It also causes the thickness of the corrugated board to drop.

Second, the problem caused by the difference in surface roughness of the original paper

Printing on rough paper with loose surface and loose structure, the ink has high permeability, and the printing ink dries quickly. On the paper with high surface smoothness and dense fiber, the drying speed of the ink is slow. Therefore, on rougher paper, the amount of ink should be increased, and the amount of ink applied should be reduced on paper with a smooth surface. The printing ink on the unsized paper dries quickly, while the printing ink on the sized paper dries slowly, but the reproducibility of the printed pattern is good. For example, the coated whiteboard paper has a lower ink absorption than the cardboard paper and the teaboard paper, and the ink drying is slow, and the smoothness is higher than that of the cardboard paper, the liner paper, and the teaboard paper. Therefore, the resolution of the fine dots is printed thereon. The rate is also high, and the reproducibility of the pattern is better than that of liner paper, cardboard paper, and teaboard paper.

Third, the problem caused by the difference in the absorption of raw paper

Due to the difference in papermaking raw materials and the difference in sizing, calendering and coating of the base paper, the absorption energy is different. For example, when overprinting on single-sided coated whiteboard paper and kraft card, the drying speed of the ink is low due to low absorption performance. Slower, so the concentration of the previous ink should be reduced to increase the viscosity of the overprinted ink. Put the lines, texts, and small patterns in the first color, and put the full version on the final color. This will improve the overprinting effect. In addition, the dark color will be placed on the front and the light will be printed on the back. It can cover the overprinting error, because the dark covering power is strong, which is good for the overprinting standard, and the light color covering ability is weak. It is not easy to observe even if there is a running rule after the back printing.

Different sizing conditions on the surface of the base paper also affect the amount of ink absorbed. The paper with a small amount of glue absorbs more ink, and the paper with a large amount of glue absorbs less ink. Therefore, the gap between the ink rollers should be adjusted according to the sizing state of the paper, that is, the gap between the ink rollers is adjusted to control the printing plate. The amount of ink. It can be seen that the original paper should be tested for the absorption performance of the base paper when it enters the factory, and the printing grooving machine and the ink-receiving personnel should have a raw paper absorption performance parameter, so that they can dispense ink and adjust the equipment. Adjust the viscosity and pH of the ink for the absorption state of different base papers. (Editor: Zhang Wei)

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