1. Product suitability
At present, flexographic printing technology has made great progress. The quality of flexographic products has been significantly improved, and it has achieved good economic benefits. It has basically been able to meet the needs of packaging and printing; in particular, the quality standards of UV flexo printing are precisely matched in color It also surpasses offset printing in terms of stability and stability. This is the best process choice for some products that require stable solid colors, such as adhesive labels and folding cartons.
Nowadays, the flexographic printing technology in the world is mainly adapted to the field: medium and narrow flexo printing machines are mainly suitable for trademark labels, clothing tags, boarding passes, luggage labeling tapes, folding cartons, stationery, small cartons, paper bags, plastic portables Bags, wrapping paper, paper cups, wallpaper, etc. The wide format flexo printing machine is mainly used for corrugated carton pre-printing, film, aluminized film, liquid packaging (such as milk Tetra Pak, fruit juice leisure bag, etc.), food, fast food, cosmetics, pharmaceutical packaging and other printing.
Domestic packaging and printing companies often misunderstand the suitability of flexographic printing products: first, they do not have a comprehensive understanding of the flexographic process, they do not have enough understanding of the characteristics of flexographic printing, and they habitually compare it with offset and gravure printing. Compare the clarity of the high network line and the gradation of the dots. Secondly, the lack of perfect flexographic quality evaluation standards, and there is no unified standard for communication with customers, causing certain misunderstandings and differences. Third, there is a lack of professional flexo designers, operators, and market development personnel, and the advantages of flexo products, such as ink layer thickness and color saturation, cannot be fully utilized; fourth, the powerful linkage of flexo printing machines Advantages, combining a variety of printing methods and post-press processing technology to improve production efficiency and reduce product costs. Inadequate understanding of the profitability of printed matter and integration costs, most domestic packaging and printing companies are still in the stage of extensive operation and management, and the profit assessment and cost integration of printed matter are not systematic and standardized.
2. Suitability of equipment and process
At present, the advantages of flexographic printing generally recognized in the field of packaging and printing include the following: 1. The use of non-toxic water-based inks and UV inks is safe and environmentally friendly. It is called "green printing" and is widely used in packaging printing of pharmaceuticals and food. 2. The ink layer is thick and the color saturation is good. The ink color can be kept consistent between different batches of printed products, which meets the requirements of packaging printing. 3. The printing materials of the flexo printing machine are wide. In addition to all kinds of paper, it is also suitable for printing plastic films, corrugated paper, adhesive materials, aluminum foil, metal foil and other materials. 4. The comprehensive processing ability of the flexo printing machine is very strong. It can be combined with printing methods such as relief printing, offset printing, screen printing, etc., linked to glazing, laminating, die cutting, waste discharge, slitting, cutting, folding, and even printing. Holes, coding, hot stamping, gluing and various complex post-press processing techniques are commonly referred to as "printing processing lines". 5. The flexo printing production line has good linkage, fast printing speed, less production space, saving labor in the subsequent process, and avoiding wasteful turnover between processes, so the comprehensive production cost is low and the economic benefit is high.
In recent years, with the continuous development and improvement of flexo technology in the world, in recent years, China has held many international large-scale printing technology exhibitions, flexo printing technology seminars and technical exchanges, and organized overseas study tours and other activities; People have witnessed the production process of high-quality color flexo products, and they are convinced that the quality of flexo products can be comparable to gravure and offset printing, which can fully meet the needs of current packaging printed products, and have new flexo printing processes and technologies. Knowledge and requirements. In recent years, China has once again set off a climax of the introduction of foreign flexographic printing technology and equipment. As of the end of 2005, nearly 400 flexographic production lines have been introduced nationwide. These equipment mainly come from the United States, Canada, Switzerland, Italy, the United Kingdom, and Germany. , Japan and Taiwan in China are distributed in more than 20 provinces, municipalities and autonomous regions in the country, mainly concentrated in areas with relatively advanced packaging and printing, such as Shanghai, Beijing, Guangdong, Yunnan, and Shaanxi.
Due to the rapid development of flexo technology in China, it has driven the development, development and production of domestic flexo printing machines, anilox rollers, plate materials, inks, and equipment supporting plate making and flexo printing. China ’s flexo production supply chain It has been formed and has made great progress in recent years. In addition to the more than 10 flexo printing machine manufacturers counted by the China Flexo Printing Association, domestic manufacturers of key supporting components for flexo printing machines are also gradually growing and developing. For example, manufacturers that can mass produce ceramic anilox rollers are: Shanghai Laser The engraving branch of the group, Shanghai Aokeli Printing Machinery Co., Ltd., etc .; manufacturers that can produce die-cutting knife cylinders that are indispensable for flexo printing machines are: Shanghai Bernaire Yahua Printing and Packaging Machinery Co., Ltd., Kunshan Sakazaki Knife Die Manufacturing Co., Ltd .; Shaanxi New Century Printing Materials Research Institute, Tianjin Ink Co., Ltd. and Shanghai Printing Technology Research Institute have developed printing materials such as water-based ink, water-based varnish, water-based additives, UV varnish, UV ink, etc. ; In terms of platemaking, Xinhua Precision Platemaking (Shanghai) Co., Ltd., Dalian Fula Flexo Platemaking Co., Ltd., and Toyo Laser Separation and Flexography (Shanghai) Co., Ltd., etc. have introduced a full set of foreign platemaking equipment and technology, making domestic flexo Plate-making technology is on the same level as international.
Shanghai Xinmin Taiyang Machinery Co., Ltd. is a wholly-owned subsidiary of Japan Taiyang Machinery Co., Ltd. in China. It is a high-tech enterprise specializing in R & D and manufacturing of rotary printing machinery. With the support of a strong technical reserve at the Japanese headquarters, it has been in Shanghai since 1995. After the factory was built, the scale continued to expand. For many years, it has been ranked first in the field of China's commercial form and bill printing machinery manufacturing; in recent years, it has shown its talents in the manufacturing field of label rotary printing machines and flexographic printing machines. The manufactured TLC satellite rotary press not only fills the gap in the domestic printing press manufacturing industry, but also ranks among the best in the industry with its annual sales and manufacturing of more than 40 units. At the end of 2006, there was another new machine that filled the domestic gap. Type-TCF satellite medium-format flexo printing machine was put into production, and it was unveiled at the Guangzhou exhibition in March 2007, which attracted high attention from the industry, and will definitely bring stronger international competitiveness to the domestic packaging and printing companies.
With regard to the selection of medium and narrow width flexo printing machines, domestic packaging and printing companies are prone to misunderstandings in the suitability of equipment and processes: First, the choice of flexo printing models should be suitable for the characteristics of the company's printed products; second, the flexo printing machine The configuration and selection of auxiliary equipment should be reasonable; in addition, the flexo process should be adjusted reasonably.
From the structural classification of flexo printing machine: three basic types: stacked, unit and satellite. The laminated flexo printing machine is simple and compact in structure, small in area, low in cost, and easy to print on the front and back sides. Its disadvantages are complex transmission, multiple gear gap points, difficulty in color group combination, poor overprint accuracy, and online difficulty; suitable for more Simple prints and prints that require front and back printing. The printing unit structure of the unit-type flexo printing machine is consistent, the transmission is simple and reliable, the operation and maintenance are simple, the adaptability is wide, the color group combination is convenient, the post-press processing process is easy to connect online, and the overprinting precision is high; its disadvantage is that it covers an area of ​​up to The paper line is long, the printed products are wasted, and the tension control requirements of the material are high. The satellite-type flexo printing machine completes the color-by-color printing registration on a common printing pressure cylinder. Because the printed material clings to the pressure cylinder, the tension of the material changes little, and the material deformation is small when drying; the machine structure is compact and the paper path is short; Therefore, it is especially suitable for the printing of thin materials with wide width and difficult tension control. The accuracy of overprinting is higher than the first two types. The disadvantage is that the machine cost is higher, the number of color groups is limited by the size of the central cylinder, and the arrangement angle of each color group is different. It is difficult to increase the color set, and it is more difficult to process the post-press processing online.
Printing companies should reasonably determine the configuration when choosing a medium-to-narrow flexo printing machine. It is impossible to ignore the characteristics of the printed products and the rationality of the process, and blindly connect too many processing procedures; too many processes and unreasonable collocation will reduce the speed of the whole machine and waste materials; before ordering equipment, it is best to ask the manufacturer ’s Professionals formulate design plans based on the products of their own companies, taking full account of the user's suitability, product quality requirements, and cost of use. In addition, after the plan of the host is determined, the selection of auxiliary equipment and components, such as flexo plate-making equipment, anilox roller cleaning equipment, and the number and line number of the anilox roller, etc., should also be considered.
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