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The application of block printing in combination printing and combination equipment

Abstract This paper briefly describes the types and current situation of combination printing, introduces in detail the application mode of block printing in combination printing, and lists the common combination printing equipment


science and technology are progressing continuously. Printing is developing towards digitalization and networking. The connotation and extension of printing have undergone great changes, and the printing technology is also progressing and updating. 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. For example, 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 definition and equipment cost of flexo printing are in the middle; In the 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 and is not suitable for mass printing. It can be seen that different printing methods sometimes have complementary advantages and disadvantages. Through the application of the 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, add decoration and artistic effects to the printed matter, make the printed matter unique and attract customers, and has been widely used in the label and packaging printing industry

I. combination printing

combination 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 combination printing, various printing processes such as flexo printing, gravure printing, offset printing and digital printing technology can be mixed. The previous combination printing mainly refers to the process of adding polish, 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. The current combination printing is mainly for the convenience of production and processing, cost saving, improving production efficiency and print quality, and meeting anti-counterfeiting and other personalized needs. It has occupied a certain proportion in the current printing application. According to different combination methods, it can be divided into the following categories

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 various combinations of 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 number of color prints

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

digital printing technologies (such as inkjet and electrostatic printing) are added to the traditional printing methods to integrate the whole printing process, thus expanding the printing business for printers. 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. It helps to prevent counterfeiting, add personalized printing information and realize 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 functions such as coating, polishing, hot stamping, film covering, die cutting, embossing, etc. on the online equipment at the back of the printing machine according to the needs of printing products. In this way, a variety of functions are integrated into 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 an ancient 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 the traditional printing technology. The combination of offset printing and offset printing, giving full play to the advantages of the two printing methods, is the first choice of many packaging enterprises, especially high-end packaging and decoration enterprises. Most of the high-grade packaging and decoration prints are designed with large area spot color, 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. The combination of offset printing and printing can meet the printing requirements of high-grade packaging and decoration printing

for example, the medium and high-end enterprises strive to build Wuxi into a demonstration base for the utilization of finishing grade graphene industry with steel laws and steel sheets, and the internationally competitive graphene industry to develop the packaging and printing of high-quality cigarettes, medicines and other products in the current model area, which can focus on plate printing and adopt the combination of offset printing and printing process. Part of the field printing relies on plate printing, and the other part uses offset printing machine to print twice; 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 realized by printing. Large area field printing and pearlescent printing are carried out with a plate printing machine to obtain the thick ink color required for high-quality cigarette packs and ensure that the ink color is uniform and consistent. In addition to some professional printing enterprises, many domestic packaging printing plants with offset printing machines are also equipped with plate printing equipment. Undoubtedly, the combination of offset printing and plate printing can create high added value for products

2. Combined printing of printing and flexographic printing at present, the rotary printing unit with high printing accuracy cooperates with the flexographic printing machine to meet its own needs and even the needs of the world by using the flexographic printing, which has the characteristics of excellent hiding power, and then makes use of the advantages of flexographic printing such as high printing speed and high definition to realize the complementarity of the two advantages. It is used for fine packaging and decoration printing, such as printing with gold and silver metal effects or showing special effects such as embossing and sanding; The anti-counterfeiting function of valuable tickets and high-grade trademarks can also be added by using light change and temperature change printing ink; This printing method can also be used to print suggestive signs for specific people (such as the blind)

printing enterprises and ink manufacturers are aware of the many advantages of rotary printing and its connection processing ability in flexographic printing, and have increased their research on this technology. Now the combined technology of printing and flexographic printing has reached a very high level. Especially in UV ink printing, the quality and stability of UV ink are quite good and easy to use. Due to the instantaneous curing of UV ink, many problems related to ink drying have been solved. In addition, the open design of modern flexographic printing machine also makes the rotary printing unit easily embedded in the production process, which promotes the increase of market demand for the combined printing process of printing and flexographic printing. As another development direction, electron beam (EB) curing ink has potential advantages. EB ink not only has the advantages of UV technology, but also has high hiding power. Today, the equipment cost of curing with EB ink in combination printing is too expensive. Once this technology is adopted, the cost will be reduced. EB curing ink will become the driving force for the next leap. It will greatly improve the hiding power of the ink layer and the speed of the printing machine, and meet the requirements of good and fast processing

III. common combined printing equipment

delant Gerber novaprint series printing machines

this series of printing machines can be equipped with flexographic printing unit, plate printing unit, lithographic printing unit, plate printing unit and processing unit (such as hot stamping, polishing, die cutting, rolling line, punching and numbering) according to different requirements of users, and even the latest variable data printing (mainly completed by inkjet system), It is widely used in packaging printing, commercial printing, direct mail printing and newspaper advertising insert printing

gelas em260/410/510s series printing press

the features of this series are that the design concept of modular and flat desk has laid a good foundation for accelerating the transformation and industrialization of relevant technical achievements in terms of flexibility and combined functions, and provided a safe possibility for the expansion of equipment in the future. The servo driven hybrid flexo and plate printing unit, as well as the front insert plate cylinder sleeve and groove roller sleeve, combined with the preset function, can simplify the workflow and minimize the adjustment preparation and operation conversion time. The sliding control panel with touch screen and the menu guidance system with friendly interface make the operation more convenient and ensure the best production reliability

RS series narrow width unit type flexible printing machine developed by interworking group

this series is developed for the needs of the market. Changing the printing process can achieve anti-counterfeiting effect, and is deeply favored by customers. The machine is made of solid and light aluminum alloy to ensure accurate operation of the machine. Based on the design principle of web printing, the whole process from paper to surface tension, deviation correction, speed control, printing, die cutting and waste recovery can be accurately completed. Moreover, it uses water-based and UV ink, which also meets the needs of market environmental protection. (end)

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