Discussion on cigarette packaging printing process (2)

2.1.3 Control of Printing Accuracy

The effect of printing color sequence on the printing quality of cigarette packs is significant. In general, in the arrangement of the color group to follow a shallow to deep printing color sequence, and fluorescent anti-counterfeiting ink to be after the ordinary ink, Varnish is placed in the last color printing. Such a color sequence arrangement can make dark colors completely covered with light colors, the anti-counterfeit area can be easily recognized, and the glossiness of cigarette packets can be reflected well, so as to achieve the overall effect of accurate overprinting, clear printed graphics, and strong glossiness. In addition, the overprint accuracy of cigarette packs is also higher than that of ordinary prints. It not only has the color overlay accuracy, but also the die-cutting accuracy is equally important. Therefore, there are also differences in the design of the rules icon. Figure 1 shows an enlarged view of the different types of rules for cigarette pack printing. Figure 1 is a triangular rule icon that monitors longitudinal and lateral accuracy. The triangles have the same size and the same spacing. Each triangle represents a process color. There are several color groups with several color patches, and the direction is the same as the direction of the paper. At the time of plate making, the icon is generated at the same time as other graphic texts, and is embodied on each printing plate. After the printing, the icon is displayed on the longitudinal side of the printing object along the direction of L. During the EOBU process, the scanning heads of each color group detecting overprinting accuracy scan each color block on the substrate in the direction of L. When Δ changes, it indicates that the longitudinal overprinting accuracy has changed; when △ changes, it indicates the lateral accuracy. It has changed. The scanning head converts these changes from light signals into electrical signals, which are reflected on the main control console as scanning curves to enable real-time monitoring and adjustment of overlay accuracy for each color. The line icon in Figure 2 is called the cutting line, which allows you to separate printed sheets with the same position from many sheets. The cutting line is located around each printed sheet, and generally consists of five to seven equally spaced lines. The size of the line spacing is determined by the accuracy of the product. After the printing is cut, the number of articles appearing on the cutting line by the cleaver is different, and the codes of the same rule are put together. The marks of different rules are separated by mark bars, and then sent to the die-cutting machine for processing. The post-processing process can use different rules to position the printed sheets of different rules on the equipment, so that the accuracy of the products can be greatly improved in die-cutting, embossing, bronzing and other processes, and the defective rate can be reduced at the same time.

2.2 Dot reproduction in cigarette pack printing

Due to the influence of traditional design features and the performance of cigarette pack EE3BU equipment, cigarette packs are mainly printed on the ground, lines, and text, with relatively few dot patterns. However, with the increasingly fierce competition in the tobacco industry, cigarette manufacturers have also made breakthroughs in the packaging design of cigarettes, from the original avoidance continuous pattern design to deliberately adding more and more continuous adjustment patterns, so that the product looks more novel ,attract consumers. At present, the cigarette pack EE3BU uses more flexographic and gravure printing methods, and these two methods are not ideal for the reproduction of outlets. In order to enable a good copy of the dot map on cigarette packs, it can be started from many aspects. solve.