Analysis of Selection of Gravure Printing Machine from the Perspective of Printing Technology (I)

In the past two years, great changes have taken place in the domestic tobacco industry. The reorganization and integration of cigarette companies, especially the increase in the concentration of cigarette brands, means that the production volume of single-brand and single-brand cigarettes will be greatly increased, which requires cigarette pack printing companies to rapidly provide large quantities of cigarette packaging. Therefore, cigarette pack printing companies must have a certain production scale and production capacity.

At present, the effective combination of a variety of materials and a variety of printing processes has become the trend of cigarette pack printing. Gravure printing has many advantages, such as high production efficiency, good hue consistency, good adaptability of printing materials, excellent performance in field, spot color, gold (silver) ink printing, etc., which can meet the stringent requirements of cigarette pack quality. Gravure machines have become a popular choice for cigarette pack printing companies. In addition, the quality inspection of cigarette packets will be further reflected in the printing odor, packaging machine adaptability, color, environmental protection and other aspects, in these aspects, gravure printing is also more advantages than other printing processes. Therefore, the purchase of gravure printing equipment has become a topic of great concern for cigarette pack printing companies. The author will talk about his own opinion about the introduction of web gravure printing machine and hope to help cigarette package printing companies.

Gravure printing machine is mainly divided into three parts: unwinding part, printing part, slitting and die-cutting part. This article first briefly analyzes the printing part.

The printing part is the core part of the gravure printing machine, which completes the printing, overprinting and drying of various colors.

1, the number of color groups to choose

The number of color groups in the gravure printing machine is very crucial. This is mainly related to the leading products of cigarette pack printing companies and the environment for domestic cigarette decoration. The design and process of domestic cigarette packs are more complex. In the past few years, domestic cigarette pack printing equipment was mainly based on 6 colors and 7 colors. In these two years, there were mainly 8 colors, and the basic configuration mode included a full version of color and four. Universal color, two spot colors and a coating machine. The number of color groups is not as good as possible. The greater the number of color groups is, the more difficult it is to control the deformation of the paper, the overprinting of various colors, etc., and the capital investment will also increase. However, if the number of color groups is selected too small, it is difficult to embody the advantages of fast and efficient gravure printing and one-step molding. Therefore, users must choose according to their needs and in combination with future development plans. Although the group-type gravure printing machine manufacturers have promised to increase the number of units in the future, they will not only increase the investment when the units are added, but will also be affected by factors such as the technical upgrading of the gravure printing machine and the installation position and space of the gravure printing machine. limit.

2, the choice of printing format

The requirements of various manufacturers on printing format are very different. The wider the format, the higher the requirement for paper and the greater the impact on overprinting. There are two types of 650mm and 820mm webs for cigarette pack printing equipment. In the past, printing companies basically chose the former, and they were more economical in terms of typesetting, plate making, plate installation, die-cutting cylinders, and paper specifications. In the typesetting, the soft pack box 6 rows and 4 columns can be arranged, the hard pack box 6 rows and 2 columns, the strip box 1 row and 2 columns, the die-cutting cylinder 6 rows and 2 columns or 8 rows and 2 columns, the paper width is 650mm maximum, due to the format Smaller, less paper distortion during printing, which is very advantageous for overprinting of products. However, there is a key problem, that is, the direction of the paper fiber is perpendicular to the printing direction when printing the barrel products. For the current high-speed cigarette packaging machine, the packaging adaptability is poor, and the appearance molding degree is poor, resulting in a quality problem. many. For this reason, many printing companies have to adopt the practice of printing only one at a time, which seriously affects the efficiency of gravure printing machines.

In the past two years, the industry has basically reached a consensus that if a printing strip box is used, it is better to choose a 820mm format gravure printing machine, so that the typesetting time strip box can be arranged in 1 row and 2 columns, hard package box 6 rows and 3 columns, soft package small Box 6 row 5 columns. For high overlay accuracy requirements and the need to use a variety of printing process products, it is recommended to minimize row, usually 12 to 16 for the ideal number of typesetting, this can reduce the waste due to paper deformation and multi-channel processing technology. If you use online diecutting, typesetting can be free from this limitation.