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The application of printing control system in combination printing


science and technology are making continuous progress. Printing is developing in the direction of digitization and networking. The connotation and extension of printing have undergone great changes, and the printing technology is also constantly improving and updating. As shown in Figure 1, printing technology is divided into traditional printing technology and digital printing technology. Traditional printing technology includes what we often call block printing, relief printing (including flexo printing), gravure printing and flat printing; In recent years, the rapid development of digital printing technology includes electrostatic imaging, ion imaging, magnetic recording imaging, inkjet imaging, thermal imaging, electronic imaging and other technologies

various printing technologies have different characteristics, such as: offset printing has high picture and text clarity and fast printing speed, but the ink layer is thin, the ink coverage is poor, and the equipment cost is high; Gravure printing has thick ink layer and fast printing speed, but the plate making cycle is slow and the equipment cost is high; The printing ink layer is thick, has good hiding power, and the equipment cost is low, but the plate making time and printing speed are slow; The covering power, printing speed, copy clarity and equipment cost of flexographic printing are in the middle; In digital printing technology, for example, the currently popular digital ink-jet printing and electrostatic printing methods can realize variable data, personalized and on-demand printing, but the printing quality is relatively poor, which is not suitable for mass printing. We can see that different printing methods sometimes have complementary advantages and disadvantages. Through the application of combined printing system, we can learn from each other and give full play to their respective advantages. In the combined printing system, especially the process of plate printing, it can make up for some shortcomings of other printing, improve the printing quality, increase the decoration and artistic effect for the printed matter, make the printed matter distinctive and attract customers, and has been widely used in the label and packaging printing industry

I. combined printing

combined printing refers to a printing process in which two or more different printing methods are combined to complete printing and even include post press processing. In combined printing, various printing processes such as flexo printing, gravure printing, offset printing and digital printing technology can be mixed. In the past, combination printing mainly refers to the addition of processes such as glazing, marking, slitting, folding, etc. on the printing machine. In terms of situation and complexity, it can no longer be compared with the current combination printing. At present, combined printing is mainly for the convenience of production and processing, cost saving, and improving production efficiency. It only needs to bring conventional accessories to match the quality of printed matter, and meet anti-counterfeiting and other personalized needs. It has occupied a certain proportion in the current printing application. As shown in Figure 1, it can be divided into the following categories according to different combinations

1. Combination based on traditional printing technology

in traditional printing technology, the most commonly used combination is: offset + flexo, offset + gravure, printing + flexo, printing + offset, etc. The offset or flexo printing unit is equipped with a rotary printing unit with high printing accuracy, which is widely used in the packaging and label printing industries

2. Combination based on digital printing technology

digital printing technology has developed rapidly. Among the combinations of various digital printing technologies, the combination of electrostatic imaging printing and inkjet printing is the most widely used. Electrostatic imaging method is suitable for high-speed monochrome printing; Inkjet printing is suitable for producing a small amount of color prints

3. Based on the combination of traditional and digital printing technology

digital printing technology (such as inkjet and electrostatic printing) is added to the traditional printing methods to integrate the whole printing process, which will rapidly expand the printing business for the printer's product sales. This combined printing system can enable the traditional printing machine to output high-quality color prints and give digital technology a stronger variable printing ability. It is especially suitable for ticket, direct mail, packaging and printing industries, and is conducive to anti-counterfeiting, adding personalized printing information, and realizing variable data printing

4. Based on the combination of printing and post press processing devices

this combination mode is a device that can perform post press processing such as coating, glazing, hot stamping, film coating, die cutting, embossing, etc. on the back of the printing machine to enter the function of the breakpoint ratio setting interface according to the needs of the printed matter. In this way, a variety of functions are gathered on one production line to form a variety of production capacity, so that the products can be completed at one time, which not only improves the production efficiency, but also reduces waste

II. The application of block printing in combination printing

block printing is a relatively old printing method. With the continuous development of printing technology, digital prepress technology, digital computer plate making, and electronic imaging technology have been widely used in block printing. Plate printing machine has also entered the field of precision printing, and its structure is developing towards high precision and automation. Due to its unique advantages, block printing has played an important role in many fields, especially in electronics, textile industry, large-scale advertising and other printing advantages, which are unmatched by other printing methods. In addition, due to the universality of printing materials, the research and development of printing machinery, ink and other consumables, and the advantages of combining with other printing, it can overcome some of its own shortcomings and make the market of printing more extensive

1. Combined printing of printing and offset printing

offset printing occupies an important position in traditional printing technology, and the combination of offset printing and printing, giving play to the advantages of the two printing methods, is the first choice for many packaging enterprises, especially high-end packaging and decoration enterprises. Most of the designs of high-end packaging and decoration prints are large-area spot colors with rich color levels and high printing quality requirements. Taking full advantage of the thick and uniform ink layer of plate printing, large-area field color blocks and other surface decorative effects can be printed, and offset printing is used to print four-color and complex line parts. Through the combination of offset printing and printing, we can meet the printing requirements of high-end packaging and decoration printing

for example, the packaging and printing of medium and high-end high-quality cigarettes, pharmaceuticals and other products can be based on plate printing and combined with offset printing + printing process. Part of the field printing relies on plate printing, and part is printed twice by offset printing machine; Pearlescent ink and spot color ink are mainly printed by printing process. At the same time, special effects such as frosting, ice flower and crystal are also achieved by printing. Large area field printing and pearlescent printing are carried out with a plate printing machine in order to obtain the thick ink color required by high-quality cigarette packs and ensure that the ink color is uniform and consistent

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