Flexo printing process for domestic cigarette packets
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The development of flexographic printing in foreign countries is in full swing, and the proportion in the printing market has also increased year by year. However, there are some “satisfaction in the country”.
One of the main reasons is that the acceptance of flexographic printing in the domestic market needs to be strengthened. On the other hand, foreign packaging design has always used simple and bright color blocks and lines to enhance visual effects. In China, packaging products are large. There are many spot colors and image designs in the area. At the same time, the domestic flexographic printing process has a large gap with foreign countries. However, for cigarette packets with color blocks, lines or medium and dark tones, flexo printing is still very promising.
First of all, the narrow-format flexo printing machine introduced in China is mostly 6+1 color group, and the last color group is used for glazing, which can exert the advantages of flexo printing on spot color printing. Secondly, the current domestic flexographic plate making factory A set of effective flexographic plate making process has been explored, which can basically meet the requirements of layer printing. In addition, flexographic printing often has in-line indentation, bronzing, die-cutting and other stations, and the production efficiency is high. In addition, the use of water-based inks in flexographic printing can make a big fuss about environmental protection.
In the process of formulating the flexo printing process, the plate making process is determined according to specific process conditions, such as the smoothness of the paper, the anilox roller parameters, the gray balance data of the ink, etc.; in the printing process, due to the viscosity of the aqueous ink, Dryness is affected by the pH value, so the pH of the ink should be strictly controlled. Considering that the flexographic printing dot enlargement is more serious than the offset printing, the printing pressure must be adjusted to the minimum as with the offset printing.
Here are a few tips: Since the ink is transferred through the anilox roller, the amount of ink required for solid and layer printing is different. Therefore, the same color of the ground and the network should be separately plated; due to the angle of the anilox roll Mostly 60°, so the screening angle of the layered version should avoid 60° to prevent the occurrence of moiré; considering the drying method of the ink is volatilization and drying, in order to improve the contrast, it is recommended to use the printing color sequence of K→CM→Y, and finally Printing spot colors; as an anilox roll for flexographic printing "heart", it must be configured to meet the needs of cigarette package printing.