There are many kinds of processing methods for cigarette packets, including offset printing, gravure printing, flexo printing, screen printing, hot stamping, and embossing. According to the characteristics of the cigarette package design, different cigarette packages need to adopt different printing processes. At present, the gravure printing process is mainly used, and some cigarette packets may also adopt a combination process. At present, the warning image cigarette package mainly adopts two printing processes, one is the full gravure printing process, and the other is the glue concave combination process.
Full gravure printing process
For the cigarette packets originally printed by the gravure printing process, in the case where the number of printing color groups of the gravure printing device is allowed and the quality of the gravure printing product meets the requirements of the customer, the full gravure printing process can still be considered for printing after the revision.
Plate making
At present, the electronic intaglio plate is mostly used for the gravure printing of the cigarette packet, and the reliability is high, the quality is good, and the image reproducibility is good. For gravure printing, the key to the quality and effect of color image printing is the quality of the plate, and the degree of detail of the image depends on the number of screen lines of the intaglio. In addition, in the gravure design plate making, it is advantageous to adjust the arrangement direction of the image tones in order to facilitate subsequent printing.
2. Printing
(1) Application of electrostatic ink absorption system
If a product with a mesh image is printed by a normal gravure process, since the cells of the dot (especially the small dots) are shallow, the ink transfer property is poor, and it is easy to dry and fix in the cell, resulting in printing. The reproducibility of the grades is poor, the dot printing is incomplete, especially the dots of the highlights are easily lost, and fine fluffy spots appear, which makes it difficult to truly reflect the tone of the image. In order to ensure the complete reproduction of the tone of the mesh image, it can be solved by adding an electrostatic ink absorption system.
(2) Proper deployment of solvent and the use of solvent in the process of gravure printing, otherwise the dry plate phenomenon is prone to occur, mainly due to the loss of the high-light part, the incompleteness of the dots, and the generation of fine spots. Therefore, try to avoid using fast-drying solvents such as ethanol, isopropanol, ethyl ester, etc., but slow-drying solvents should be used, such as positive
The purpose of propyl ester, butyl ester, propylene glycol methyl ether, etc., is to slow the drying speed of the ink and prevent the ink from drying in the cells before being transferred to the printing material.
In summary, the full gravure printing process follows the original printing method, which can reduce certain inputs in terms of equipment and personnel, but also has its inadequacies. For example, when the printing mesh is adjusted, the ink transfer is not good and it is easy to cause dryness. Versions, dot distortion, gradation transitions are not delicate, and colors are not bright, so it is impossible to print high-resolution mesh images.
Glue combination process
When the quality of the gravure product cannot meet the higher requirements of the customer, it is necessary to consider the combination with the offset printing process. The main feature of the offset printing process is that the image reproducibility is strong, and it is a strong point in the image printing of the mesh. The image printed by the offset printing process has high definition, bright colors and rich and delicate layers, which is also the purpose of warning the introduction of the image printing of cigarette packets into the offset printing process. The combination process of the concave and concave can not only maintain the main design style and appearance printing effect of the original cigarette package, but also ensure the perfect reproduction of the image and achieve a better fusion of the two.
1. First gravure printing process
The process of the gravure printing process after the offset printing is as follows: the warning image portion is printed by the offset printing process, and the other graphic portions are completed by the gravure printing process. This combination process is generally only suitable for sheetfed printing. At present, offset printing machines generally consist of multiple color groups (four or more colors). Sheet-fed gravure printing machines generally consist of single or two color groups, and most cigarette packages are six or more. After adding warning images, More than ten colors. Therefore, the warning image portion can be completed in one time by the offset printing process, and the other image portions can be completed in multiple times when using the sheet-fed gravure printing process.
2. First gravure printing process
The process of the gravure printing process is to first print the other graphic parts except the warning image by the web gravure printing machine, and then cut the semi-finished products into a single sheet of paper, and then complete the four-color printing of the warning image by the offset printing process. . This combined process takes advantage of existing web multicolor gravure presses. However, since the web gravure printing machine cannot realize the connection light, the glazing process can only be performed after the warning image printing is completed. If the offset printing machine has the glazing function, the glazing of the printing product can also be completed in the offset printing process. Otherwise, it is necessary to transfer to the gravure printing section to illuminate the printed matter through a sheet-fed gravure printing machine.
3. Precautions
(1) After gravure printing, the paper loses its moisture due to heat loss. At this time, if the seal is protected from moisture, the paper will be more deformed, which will affect the overprinting of the offset printing.
(2) In the gravure design plate making, the cutting line mark should be appropriately added to facilitate the observation of the fluctuation of the cutting specifications of the printed products, as well as the classification of the printed products of different specifications, so that the front and side gauges of the same type of printing products Consistently, in order to achieve high precision of printing registration and low scrap rate in offset printing.
(3) In the gravure printing process, the gravure ink is overprinted on the offset ink layer. Since the offset ink layer is thin, the drying and adsorption of the gravure ink are not affected. However, in the gravure offset printing process, since the gravure ink layer is thick and is not easy to absorb ink, the overprinted offset ink layer cannot be quickly penetrated and dried. When the printed product stack is too high, the back side is sticky. Dirty phenomenon. Therefore, the infrared drying device on the offset printing machine must be turned on to speed up the offset printing.
The drying speed of the ink layer, at the same time, appropriately increase the amount of powder sprayed, and reduce the stacking height of the printed product.
Outlook
At present, the research and exploration of the warning image printing process of cigarettes in China is still at a preliminary stage, and it must be continuously improved and improved. The author believes that through the continuous exploration and production exercise of the warning image cigarette package printing process, it will certainly help us to accumulate more and better valuable experience, and take an important step in coping with the revision of the domestic cigarette package in the future, and promote the future cigarette package. The road to printing is better, faster, and broader.
　　 The above content is selected from the 4th issue of 2011, Printing and Printing , Packaging and Decoration, and more journal content, please pay attention to the journal channel.
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