Wonderful gravure leads the new direction of cigarette package printing

China's tobacco industry has embarked on the road of restructuring and integration. Today, the pattern of large enterprises, big brands and big markets has basically taken shape. Under such a large environment, all cigarette package printing enterprises are faced with various opportunities and challenges. "Scale, low cost and high efficiency" have gradually become the main features of contemporary cigarette package printing.

Tobacco bag gravure features

The printing demand of cigarette packs in China is mainly reflected in two aspects: First, the design of cigarette packs in China is mainly based on solid color blocks, and the theme images of most cigarette packs are mainly abstract patterns, and the images of net tone images are relatively small. Therefore, in the cigarette packaging printing process, the requirements in the field of cigarette packets Ministry separation phase stability, color saturation; Second, China's tobacco industry restructuring and cigarette brand integration work has been completed, a single large-scale cigarette brands, so It is required that cigarette package printing has the characteristics of high production efficiency and low production cost, and these requirements are precisely the advantages of gravure printing, which is also the main reason for the widespread application of gravure printing in the field of cigarette package printing.

1. Hue is stable and color saturation is high

The hue and saturation of the gravure product is determined by the depth of the intaglio cell and the viscosity of the gravure ink. Due to the high hardness of the chrome plating on the surface of the intaglio plate, the depth of the gravure of the gravure plate is basically constant during the actual printing process, and the viscosity of the gravure ink needs to be periodically tested by the operator or by the gravure ink automatic viscosity control system. Control to achieve good ink viscosity control, so that gravure can easily meet the hue stability requirements of cigarette package printing. At the same time, the thickness of the intaglio ink layer is large, so the color saturation of the gravure product is relatively high.

2. High production efficiency and low production cost

At present, the printing speed of domestic gravure printing equipment can reach more than 200 m / min, which is equivalent to about 2 times the printing speed of advanced offset printing equipment. In addition, gravure printing equipment can realize continuous printing of web, as well as efficient automatic production of on-line pressing, die-cutting, etc. Compared with other printing methods, it has higher production efficiency, lower production cost, and is more suitable for large-volume printing production of cigarette packets. The advantages.

New technology for cigarette gravure printing

Focusing on the theme of “scale, low cost and high efficiency”, domestic cigarette package printing companies have carried out a large number of technical research and development work and achieved remarkable results. Here, the author will focus on two new technologies: web segmented gravure and multi-process integrated gravure in cigarette package gravure printing.

Roll paper segment gravure printing technology

The technical process of the web segment gravure printing technology is: gravure printing → holographic positioning hot stamping → die cutting (with pressure bump) → finished product.

(1) The gravure printing process of the web adopts the seamless splicing method for engraving and splicing. Each sheet can reduce the consumption of the crepe of about 10mm, which is equivalent to saving nearly 2% of the paper consumption cost, so the web is concave. Printing technology is especially suitable for large-scale cigarette package printing, which can make the cigarette package printing enterprises obtain considerable economic benefits.

(2) The main advantages of web positioning hot stamping technology are: 1 high production efficiency, the speed of single-sheet holographic hot stamping is generally 5500 sheets/hour, and the speed of web holographic hot stamping is generally 80 meters. / min (about 9795 sheets / hour); 2 sets of printing accuracy, some people in the industry worry that the speed of web positioning hot stamping will affect the accuracy of overprinting, in fact, due to the use of web positioning hot stamping technology It is a motor simulation stepping technology, and its overprinting accuracy is higher than that of a single sheet of paper. General, sheet of paper

The overprinting error of the positioning hot stamping is ±0.10mm, and the overprinting error of the web positioning hot stamping is ±0.05mm, and the product hot stamping pass rate is basically maintained above 99%; 3 hot stamping effect is good, the web is positioned hot The realization process of the printing is line contact, the air in the hot stamping foil can be completely exhausted, and the surface of the hot stamping product is bright, so the web positioning hot stamping technology has the anti-counterfeiting function that cannot be surpassed by the single sheet positioning hot stamping technology.

(3) The die-cutting process of the web can simultaneously complete the two processes of pressing unevenness and die-cutting, which not only improves the quality of the cigarette pack, but also improves the production efficiency of the cigarette pack printing.

2. Multi-process integrated gravure printing technology

For thin cigarette package printing with multiple processes, thin paper needs to flow between various processes, and the expansion and contraction changes greatly, so it is difficult to meet the production process conditions of each process, especially the offset printing with high requirements for overprinting precision. , screen printing and embossing process, often lead to low production efficiency, low pass rate and poor product quality. In order to solve the above problems, the R&D personnel who focus on the cigarette gravure printing technology have overcome the following three technical difficulties through many experiments, and finally realized the multi-process integrated gravure printing technology.

(1) Solving the problem of the standard seam of the common laser paper and the gravure overprinting of the web, and realizing the gravure printing of the web without the seam laser.

(2) By optimizing the process parameters of the pressure-concave roller and applying the anti-aliasing and over-pressure protection technology of the pressure-concave roller, the integrated production technology of the gravure printing and the embossing process is realized.

(3) By optimizing the gravure process parameters and improving the performance of the gravure ink, the integrated production technology of gravure and offset printing and screen printing processes is realized.

The above is a multi-process integrated gravure printing technology, which solves problems such as inaccurate overprinting between processes, multi-process, multi-process production process, low production efficiency, improper process control, and paper stretching and deformation. After multi-batch production verification, the quality of the cigarette package products produced by this technology is stable, the pass rate can be improved by nearly 6%, and the overall production speed is also increased by more than 7 times, which is completely in line with the “scale, low cost and high efficiency of cigarette package printing”. "Production needs."

　　 The above content is selected from the 10th issue of 2012, Printing and Printing , Packaging and Decoration, and more journal content, please pay attention to the journal channel.

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