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The main advantages of offset printing are: the printing process and equipment have been developed very well. The supporting raw and auxiliary materials have also been fully matured. Printing quality is good. Lower cost. Has been accepted by domestic and foreign printing companies. At present, offset printing accounts for more than half of the total printing volume in foreign countries; in China, books, newspapers, and newspapers have almost been offset by 10%. In the packaging and printing has been introduced more than 800 offset presses, many companies have not only increased a lot of offset presses. And it also introduced a multi-color offset printing press with the world's advanced level. The amount of plastic printing has also accounted for about 60%. Offset printing also plays a dominant role in the packaging field. Regardless of domestic and foreign, in a long time. The proportion of plastic printing may decrease. But its dominant position will not change. Offset printing is mainly used for the printing of paper-based materials. Printing on plastic film has many limitations. Sheet-fed offset printing format can be changed. More flexible. At present, most web offset presses have a fixed print format. Its application is limited. With the development of technology, web offset presses are also constantly improving. Now we have successfully developed a roll offset offset press that can change the printing format. At the same time, it developed a successful seamless roll offset paper offset press. The printing cylinder of this web offset printing machine is seamless, and in this respect it is already the same as a roll offset gravure printing machine.
Offset presses continue to improve on printing capabilities. After the improvement and retrofit some parts. Can print corrugated cardboard. With improved and retrofitted uV dryers, UV prints can be printed. Offset printing inks will soon be used in eight practical applications. This will be another advancement in adhesive printing.
Gravure to reduce costs
Gravure. Ink full three-dimensional, in a variety of printing methods. The printing quality is the best, and the printing quality is stable. The printing plate has a long life and is suitable for large-volume printing. Gravure printable material. Such as plastic film. But the gravure plate is complicated and the price is high. Its benzene-containing ink pollutes the environment, and these two issues have affected the development of gravure printing. In particular, the reduction of high-volume prints. The short version also requires a large increase in low-price prints. Make gravure keep losing the market. Domestic and foreign experts all believe that the proportion of gravure printing in the printing field will decrease year by year, even in the field of packaging and printing.
In the flexible packaging market in the United States, gravure accounts for only 10%. And it is falling. In China's flexible packaging printing and cigarette box printing. Gravure occupies an important position. More than 200 sets of gravure printing machines have been introduced. In some areas too many gravure machines have been introduced. This caused excess production capacity, which was formed under the special circumstances of our country.
Due to technological progress. Gravure machines are also constantly improving development. The application of gravure printing plate OTP and the gradual promotion of gravure printing ink have gradually solved two major problems of the gravure printing process. With gravure printing important issues resolved. Whether it will reverse the downward trend of the gravure printing process remains to be tested in practice.
Flexo will gradually become mainstream
(A) The main advantages of flexo
1, the device structure is simple. Easy to form a production line. In flexographic, gravure, flexo, and other printing equipment, the flexo press is the simplest structure. As a result, the price of flexo presses is relatively low, and printers invest less in equipment. At present, most of the flexo presses are combined with hot stamping, glazing, cutting, slitting, die cutting, indentation, punching, and window processing. Greatly improved labor productivity.
2, a wide range of applications and substrates. Flexo can print almost all prints and use all substrates. In particular, corrugated printing in packaging printing has its own unique features.
3, extensive use of water-based ink. Among the three printing methods of offset printing, gravure printing and flexo printing, only flexographic printing currently uses water-based inks. Non-toxic, non-polluting, favorable for environmental protection, especially suitable for packaging and printing.
4, the lower cost. The low cost of flexo printing has formed a wide range of consensus in foreign countries, and there are disputes in the country. The main reason is that most flexographic printing machines, flexo printing plates and flexo printing inks used in domestic flexo printing are imported, resulting in a lower cost. high. Offset printing and gravure printing are relatively inexpensive in this regard. With the local production of flexographic equipment, its plates and raw materials, its cost will gradually decrease.
(B) The main reasons for the slow development of flexo printing in China
1. There are cognition and specific issues: After the 1970s, it was at the international stage that flexo printing was rapidly and technologically mature. At that time, China was fully advocating the development of offset printing. The development of offset printing is undoubtedly correct, but there is little publicity for flexo printing. Many people in China know little about flexo printing. Plus, printers know little about flexo printing. therefore. In the 1980s, RI flexo presses really did not fully function. In the middle and late 1990s, China introduced more foreign flexo presses. At the same time, China's own developed flexo presses gradually matured, but it is not good for the printing process. Some user-selected flexo presses are not suitable for the prints they are preparing to print.
2. Domestic production of flexographic plates and raw and auxiliary materials has a long way to go: Currently, most of them rely on RI. This is an important reason for increasing the cost of flexo printing.
3. The requirements for flexo printing are unreasonable: At present, domestic flexographic printing machines, whether they are imported or domestic, basically belong to middle and low grade products. In addition, domestic flexo printing technology is still not fully passed, and its printed products are of medium and low grades. Many people take these prints and more high-grade offset printing. Comparing gravure printing products is unreasonable. Experience abroad has long proved that flexo printing can print high-grade prints. However, there must be corresponding equipment and corresponding plates, raw and auxiliary materials as well as mature processes and high-level operators.
4, choose the right equipment and printed products: flexo printing can not only play a specialty in the field of packaging and printing, but also can fully play a role in the printing of books, newspapers. Flexo printing has its own uniqueness in packaging printing, and a consensus has been formed in the printing industry. Corrugated board printing in packaging and printing can give full play to the advantages of flexo printing. 85-98% foreign corrugated board is printed on flexo presses. Label printing is also a strong point for flexo printing. The proportion of developed countries using flexo printing is 85-90 percent, and it is also developing rapidly in China. Flexible packaging printing is the main competition place for flexo and gravure printing, and the development of each country is also different. Carton printing has the competition of offset printing, flexo printing, and gravure printing. The U.S. flexo printing is 30L-H4O%, and the development situation varies from country to country. The flexographic printing should be used first in the prints most suitable for flexo printing. According to the specific requirements of these prints, choose the most suitable flexo press.
(C) How to accelerate development
l, out of the misunderstanding. Although flexo printing has a wide range of printing, it is not a single machine that can print anything. It is the same as other printing methods, each machine has a specific printing range. Even if a certain - Ei] J ~ l range of flexographic presses also have high, medium and low grades. This is the first problem that should be solved. Second, we should give full play to the flexo-printing expertise rather than compare it with other printing methods. It is not possible to compare blindly with other printing methods regardless of the level of equipment, raw and auxiliary materials, and printing technology. Third, we should carefully analyze the reasons for the current problems of flexo printing, and propose solutions to existing problems. Fourth, the requirements for quality should be appropriate. People have different requirements for quality of life. Similarly, there are different requirements for print quality. In particular, packaging printing, whether it is needed or not, requires high-precision printing, which is probably one of the manifestations of over-packaging in China. The development of flexographic printing in China is relatively late. At present, it accounts for about 5% of packaging printing, and there should be a broad prospect for development.
2. Seriously solve the problems of production and quality of flexographic plate and other raw and auxiliary materials. The local production and quality of flexographic plates and other raw and auxiliary materials should be improved as soon as possible through cooperation with foreign countries and our own. In order to solve the problem of the high cost of flexo printing, the current large number of imports. The cost issue is the key to the survival and development of flexo printing.
3. To solve the problem of standardization and dataization of flexo printing as soon as possible. Although there are many variables in flexo printing, standardization is difficult and it is difficult to digitize. However, we should continue to summarize the use of better corporate experience based on the optimization of the operating procedures and data used in different printing process of different printing products to form a consensus. First, we will form enterprise standards and gradually form industry standards. Flexo printing involves a variety of different substrates and inks, and we can form different standards one by one. Without solving this problem, flexographic mass production and stability are difficult to solve.
4, as soon as possible to cultivate qualified flexo platemaking, printing talent.
Source: China Automation Network
Offset printing progress