How to adjust the ink flexographic printing process for different Christmas Gift Wrap Boxes?

How to adjust the ink flexographic printing process for different Christmas Gift Wrap Boxes?

Common types of base paper used in Christmas Gift Wrap Boxes are: carton paper, hanging paper, kraft paper, tea board paper, white board paper and single-sided coated white board paper. Due to the differences in the production materials and papermaking process of each base paper, the physical and chemical indexes, surface properties and printing suitability of the above-mentioned several base papers are quite different. The following will discuss the problems caused by the above paper products to the ink printing and starting process of corrugated cardboard.

One, low gram base paper brought about problems

When using low gram base paper to make corrugated board surface paper, there will be corrugated board surface exposed corrugated traces. It is easy to cause obvious corrugated and can not print the required text and text content in the low concave of the corrugated board. In view of the uneven surface caused by the corrugated board, the flexible resin plate with good resilience should be selected to do the printing plate to overcome the defects of unclear printing and exposed bottom. In particular, the A-type corrugated board produced with low-gram paper will suffer great damage to the flat pressure strength of the corrugated board after printing with the printing press. In addition, the side pressure strength of the corrugated board will also be greatly damaged after the printing roll and embodying roll.

If the surface of corrugated board rickety difference is too large, but also easy to lead to corrugated board line production of corrugated board warping. The warped board will lead to overprinting inaccuracy and printing grooving out of gauge phenomenon, so the warped board should be pressed before printing. If the forced printing of uneven corrugated board is easy to cause the rules. It will also cause the thickness of corrugated cardboard to decrease.

Two, the base paper surface roughness of different problems

When printing on the base paper with rough surface and loose structure, the ink permeability is large and the ink blot dries quickly, while when printing on the paper with high surface smoothness and dense fiber, the ink blot dries slowly. Therefore, in the rough paper, should increase the amount of ink, in the surface of smooth paper should be reduced. The printing ink on the paper without sizing dries quickly, while the printing ink on the paper after sizing dries slowly, but the reproducibility of the printing pattern is good. Such as coated whiteboard paper due to ink absorption than box board paper, tea board paper small, ink drying slow, and smoothness than box board paper, hanging paper, tea board paper, therefore, the resolution of printing small dot is also high, the reproducibility of the pattern is also better than hanging paper, box board paper, tea board paper.

Three, the base paper absorption difference caused by the problem

Due to the differences in paper raw materials and base paper sizing, embossing and coating, the absorption energy is different. For example, when overprinting on single-sided coated whiteboard paper and cattle pickup truck, the drying speed of ink is slower because of the low absorption performance, so the concentration of the previous ink should be reduced, and the viscosity of the overprinting ink should be improved. And put small lines, text, pattern in the first color printing, put the full version of the field in the last color printing, so that we can improve the effect of dieyin, in addition to deep color printed in front, put the light-colored behind India, can cover the overprint error, because the dark covering power, and is conducive to overprint standards, and light color cover ability is weak, After printing even if there is a running gauge phenomenon is not easy to observe.

Different sizing conditions on the surface of the base paper will also affect the amount of ink absorption. The paper with small sizing volume absorbs more ink, and the paper with large sizing volume absorbs less ink. Therefore, according to the sizing state of the paper, the gap of the ink roller should be adjusted, that is, the gap of the ink roller should be adjusted to control the amount of ink on the plate. It can be seen that the absorption performance of the base paper should be detected when the base paper enters the factory, and the printing slotting machine and ink distribution personnel should be given a absorption performance parameter of the base paper, so as to facilitate their ink distribution and adjustment of equipment. The viscosity and PH of ink are adjusted according to the absorption state of different base paper.