Misunderstandings in the practical application of

2022-08-14
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Misunderstandings in the practical application of medium and narrow width flexographic printing machine

1. Product suitability

at present, flexographic printing technology has made great progress, the quality of flexographic printing products has been significantly improved, and good economic benefits have been achieved, which can basically meet the needs of packaging and printing; In particular, the quality standard of UV flexo printing is more obvious than offset printing in terms of accurate matching and stability of colors and even the regional differences of distribution types, which is the best process choice for some products that need stable field colors, such as self-adhesive labels, folding cartons, etc

flexographic printing technology in the world is mainly applicable to: medium and narrow width flexographic printing machines are mainly applicable to trademark labels, clothing tags, boarding passes, luggage tags, folding cartons, stationery, small cartons, paper bags, plastic handbags, packaging paper, paper cups, wallpaper, etc. The wide flexographic machine is mainly used for the printing of corrugated box preprint, film, aluminized film, liquid packaging (such as milk Tetra Pak, fruit juice Kangle bag, etc.), food, instant food, cosmetics, pharmaceutical packaging, etc

domestic packaging and printing enterprises are often prone to misunderstandings in dealing with the applicability of flexographic printing products: first, they do not have a comprehensive understanding of flexographic printing technology, and do not fully understand the characteristics of flexographic printing. They habitually compare the sharpness of high lines and the gradual level of dots with offset printing and concave printing. Secondly, there is a lack of perfect flexo quality evaluation standards, and there is no unified standard for communication with customers, resulting in certain misunderstandings and differences. Third, there is a lack of professional flexo designers, operators and market expansion personnel, which can not give full play to the advantages of flexo products, such as ink layer thickness and color saturation; Fourth, it did not give full play to the strong advantage of flexographic machine linkage, and combined a variety of printing methods and post press processing technology to improve production efficiency and reduce product costs. There is insufficient understanding of the profit margin and integration cost of printed matter. Most domestic packaging and printing enterprises are still in the stage of extensive management, and the profit assessment and cost integration of printed matter are not systematic and standardized

2. Suitability of equipment and process

at present, flexographic printing, which is generally recognized in the field of packaging and printing, has the following advantages: 1. It uses non-toxic water-based ink and UV ink, which is safe and environmentally friendly. When the material temperature exceeds 220 ℃, it is called green printing, and is widely used for packaging and printing of drugs and food. 2. The ink layer is thick and the color saturation is good. The ink color of different batches of prints can be kept consistent, which meets the characteristics and requirements of packaging and printing. 3. Flexo printing machine has a wide range of printing materials. In addition to all kinds of paper, it is also suitable for printing plastic film, corrugated paper, self-adhesive materials, aluminum foil, metal foil and other materials. 4. Flexographic printing machine has a strong comprehensive processing ability. It can connect and combine embossing, offset printing, printing and other printing methods, linkage glazing, film coating, die cutting, waste discharge, slitting, sheet cutting, folding, and even punching, code spraying, bronzing, gluing a variety of complex post press processing processes, which are usually called printing processing production lines. 5. The flexographic printing production line has good linkage, fast printing speed, less occupation of production site, saves labor in the next process, and avoids the turnover waste between processes. Therefore, the comprehensive production cost is low and the economic benefit is high

in recent years, with the continuous development and improvement of flexo printing technology in the world, China has held many international large-scale printing technology exhibitions, flexo printing technology seminars and technical exchanges in recent years, as well as organizing overseas study tours and other activities; People in the printing industry in China have witnessed the production process of high-quality color flexographic products, and they are convinced that the quality of flexographic products has been comparable to that of gravure and offset printing (2) whether the relative advance and return difference of static torque indication is comparable to that of subsequent verification, which can fully meet the current needs of packaging printing products, and have new understanding and requirements for flexographic printing process and technology. In recent years, China has once again set off a climax of introducing foreign flexographic printing technology and equipment. By the end of 2005, nearly 400 flexographic printing production lines had been introduced across the country. These equipment mainly came from the United States, Canada, Switzerland, Italy, Britain, Germany, Japan and Taiwan, and were distributed in more than 20 provinces, cities and autonomous regions across the country, mainly concentrated in Shanghai, Beijing, Guangdong, Yunnan Shaanxi and other regions with relatively developed packaging and printing

due to the rapid development of flexographic printing technology in China, it has driven the development, research and production of domestic flexographic printing machines, embossing rollers, plates, inks and equipment supporting plate making and flexographic printing. China's flexographic printing production supply chain has been formed and has made great progress in recent years. In addition to the more than 10 flexographic machine manufacturers counted by the China flexographic printing association, domestic manufacturers of key supporting components of flexographic machines are also gradually growing and developing. For example, manufacturers that can mass produce ceramic roller include: engraving branch under Shanghai laser group, Shanghai aokeli printing machinery company, etc; For example, the manufacturers that can produce the indispensable die-cutting cartridge for flexographic printing machines are: Shanghai Bonaire Yahua printing and Packaging Machinery Co., Ltd., Kunshan sakazaki knife mold production Co., Ltd; Shaanxi new century printing materials research institute, Tianjin Ink Co., Ltd. and Shanghai Printing Technology Research Institute have developed water-based ink, water-based varnish, water-based additives, UV varnish, UV ink and other printing materials; In terms of plate making, Xinhua precision plate making (Shanghai) Co., Ltd., Dalian Fulai flexographic plate making Co., Ltd. and Toyo laser color separation flexographic plate (Shanghai) Co., Ltd. have introduced a full set of foreign plate making equipment and technology, making the domestic flexographic plate making technology at the same level as the international level

Shanghai Xinmin sun Machinery Co., Ltd. is a wholly-owned subsidiary of Japan sun Machinery Co., Ltd. in China. It is a high-tech enterprise specializing in the R & D and manufacturing of rotary printing machinery. With the support of the strong technical reserves of the Japanese headquarters, its scale has been expanding since its establishment in Shanghai in 1995. For many years, it has been ranked first in the manufacturing field of commercial forms and bill printing machinery in China; In recent years, it has made great achievements in the manufacturing field of label rotary printing machine and flexographic printing machine. The TLC satellite rotary printing machine not only fills the gap in the domestic printing machine manufacturing industry, but also ranks among the top in the industry with the remarkable achievements of annual sales and manufacturing of more than 40 sets; At the end of 2006, another new type of TCF satellite type medium width flexographic printing machine, which filled the gap in China, was put into production. It was unveiled at the Guangzhou Exhibition in March 2007 and attracted great attention from the industry. It will bring stronger international competitiveness to the domestic packaging and printing enterprises

for the selection of medium and narrow width flexographic printing machine, domestic packaging and printing enterprises are prone to misunderstandings in the applicability of equipment and process: first, the selection of flexographic printing machine should be suitable for the characteristics of enterprise printing products (1) after solid solution at different temperatures and double aging treatment; Secondly, the configuration of flexographic press and the selection of auxiliary equipment should be reasonable; In addition, we should reasonably adjust the flexographic printing process

according to the structure of flexographic press, there are three basic types: cascade type, unit type and satellite type. The laminated flexographic press has the advantages of simple and compact structure, small floor area, low cost and easy front and back printing; Its disadvantages are complex transmission, many gear clearance points, difficult color combination, poor overprint accuracy, and difficult online; It is suitable for simple printing and printing that requires front and back face printing. The printing unit of the unit flexographic press has the same structure, simple and reliable transmission, simple operation and maintenance, wide adaptability, convenient color combination, easy on-line post press processing procedures, and high overprint accuracy; Its disadvantages are that it covers an area of, the paper route is long, the printing waste is large, and the tension control requirements of materials are high. The satellite flexographic press completes color by color printing registration on the common printing cylinder. Because the printing material is close to the cylinder, the tension of the material changes little and the material deformation is small when drying; The machine has compact structure and short paper feeding circuit; Therefore, it is especially suitable for the printing of thin materials with wide width and difficult tension control, and the overprint accuracy is higher than the first two types; Its disadvantage is that the machine cost is high, the number of color decks is limited by the size of the central pressing cylinder, the arrangement angles of various color decks are different, it is difficult to increase color decks, and it is difficult to online the post press processing process

printing enterprises should reasonably determine the configuration when selecting medium and narrow width flexographic presses. We cannot blindly connect too many processing procedures without considering the characteristics of printing products and the rationality of technology; Too many processes and unreasonable collocation will reduce the speed of the whole machine and waste materials; Before ordering the equipment, it is best to invite the professionals of the manufacturer to formulate the design scheme according to the products of their own enterprises, taking full account of the applicability of users, the quality requirements of products, as well as the use cost and other factors. In addition, after determining the scheme of the host machine, we should also consider the selection of auxiliary equipment and components, such as flexo plate making equipment, wrinkle roller cleaning equipment, and the matching of the number of wrinkle rollers and lines

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