With the continuous advancement of technology, flexographic printing has gradually entered a new era. The reason why flexographic printing has been greatly developed is due to its economy and high quality. In Europe and the United States, since the 1990s, with the improvement of science and technology, flexographic printing technology, process, and equipment have made new breakthroughs, and the product quality has been comparable to offset and gravure printing. But in Asia, flexographic printing is currently in its infancy, compared with Japan and European and American countries, especially in the field of medium and narrow label printing. Toppan printing is based on JEl as the mainstream faction, followed by flexographic printing. There are many factors, mainly: on the one hand, domestic brands still have a big gap in the main technical indicators, especially in printing speed and overprint accuracy; on the other hand, the unit type is the main type of domestic machine, satellite Few flexo presses have few manufacturers that can be trial-produced in China. The multi-function online satellite medium-format flexo printing press is still blank in China's printing press manufacturing industry.
At the beginning of 2007, the first domestic satellite flexo rotary printing machine TCF-450-8C was rolled out of Shanghai Xinmin Sunshine Machinery Co., Ltd. This model is derived from the mature product developed by Japan Sun Machinery Manufacturing Co., Ltd., and on this basis, it is assembled in Shanghai. Its main technical indicators greatly exceed domestic flexographic printing machines.
The biggest feature of this machine:
1. The maximum printing paper width is 450ram, which can be applied to printing carriers of various specifications and materials, including: paper, 80PP film, PVC film, PE film, toothpaste hose, etc.
2. The satellite press cylinder that can carry the largest 8-color group can realize simultaneous printing of the 8-color group. The flip device installed in the fourth and fifth colors realizes front and back printing, which is more suitable for complex and variable printing jobs.
3. The satellite printing color group structure guarantees the high precision of 8-color overprint. The overall overprint precision of the machine is controlled within 0.1 mm.
4. A large metal cylinder with a diameter of l800mm and a cooling water circulation device are built in, which solves the problems of deformation of the material due to the fear of heat and emulsification of the ink due to the fear of heat during film printing.
5. Adopt the drawer type printing device, which can quickly change the plate and wash. Greatly reduce the burden on operators. To achieve high-quality printed products.
6. This machine adopts full servo tension control system to stably control the printing tension of each printing color group.
Simply put, the operating principle of a flexographic printing machine is basically a printing method composed of a plate cylinder and an anilox roller. It is required to adopt a mechanical structure that can be quickly and easily installed when replacing the plate cylinder / anilox roller / scraper. The following is a brief introduction to the different ink supply systems of existing flexographic printing presses:
1. Double roller
Although there is also a scraper type in the double roller type, usually a scraper is still used to scrape off the excess ink on the surface of the anilox roller to ensure that the correct amount of ink is provided to the layout. In theory, it is possible to directly immerse the anilox roller in the ink without the twisting roller, but the grid on the surface of the anilox roller cannot provide sufficient ink during high-speed operation, which may cause fly-white or ghosting problems.
The scraper-type working method, on the one hand, is very easy to exchange the anilox roller, on the other hand, because it can not print in forward and reverse directions, the same printing unit cannot use both front and back printing. In addition, it should be noted that the rubber roller is the source of flying ink, which may stain the printed matter.
2. Ink fountain
As with offset and relief printing, ink is supplied by the ink fountain. A simplified method that does not take up space, because of the small amount of ink used, is mostly oriented to small batch production. However, the exchange of the doctor blade and the anilox roller is troublesome.
3. Ink chamber type
A closed cavity is placed between the anilox roller and the doctor blade, and ink is circulated and supplied. The system does not take up space; because of the closed connection between the cavity and the ink pump, it is suitable for solvent / water-based inks that need to maintain a certain concentration.
Usually when the doctor blade or anilox roller is exchanged, the ink system must be removed. This mode of operation also requires a circulation pump to maintain ink circulation. In addition, when changing the color, it takes some time to clean the hose and the pump.
The ink supply system of the TCF-450-8C satellite flexo printing machine adopts the open ink chamber type. Compared with the traditional closed ink chamber, the design of the open ink chamber allows the operator to save the cleaning ink when changing the color. The time it takes.
In order not to let the operator's skills affect the operation, how to make the mechanical elements and mechanical material elements of the equipment working in the correct setting state become more and more important. Especially for flexographic printing, because the plate material is soft, the image is very sensitive to changes in printing pressure, so setting management of printing pressure is very important. The printing pressure of flexographic printing is also called light touch, and the printing pressure is set in units of 10 μm. Therefore, not only the mechanical accuracy but also the accuracy of the surrounding mechanical materials have extremely high requirements.
In addition to printing quality, the printing quality is also related to the line number, capacity, and material / thickness / hardness of the anilox roller; the material / thickness / hardness of the buffer tape; the thickness and surface state of the substrate; the nature and viscosity of the ink To determine the conditions. Compared with the ink supply system of offset printing or letterpress printing, flexographic printing has the characteristic of very few ink supply rollers.
In addition, the TCF-450-8C satellite flexo printing machine can achieve any combination of various printing methods, at the same time online multiple processing techniques, and the overall accuracy is very high; and this, other domestic manufacturers are still exploring Among. Using the technology of Japan Sun to realize the domestic assembly of equipment, the quality of the imported IZl equipment and the price of domestic equipment quickly filled the domestic gap. Make up for the gap in the domestic satellite flexo machine manufacturing industry.
It is worth mentioning that the TCF-450-8C satellite flexo printing machine participated in the Guangzhou Exhibition in March 2007, the PrintEx-p0 Exhibition in Beijing in June of the same year, and the South China Exhibition in Guangzhou in March 2008. The printing materials: pearlescent film and transparent shrink film. The heat resistance, stretchability and inking performance of the pearlescent film are relatively stronger than the transparent shrink film. How can the two different materials be used to achieve the effect that the actual production needs to achieve? TCF-450-8C satellite flexo printing machine through different Trial prints, to demonstrate to the visitors a good tension control, printing accuracy and cooling process.
One of the biggest advantages of flexographic printing is that the flexographic printing process can effectively adapt to the substrates needed in convenient food packaging printing and develop a variety of technologies. Especially in the food field, flexible packaging is also constantly replacing metal, glass and other containers. Whether it is printed on a plastic film to make a small food packaging bag that can be heated and enjoyed, or a vegetable packaging bag that can be re-closed to maintain a longer fresh period, etc. In the European and American flexographic printing and packaging market, consumer goods manufacturers account for the majority, and the market share of flexographic printing continues to rise year by year. The water-based inks used in it are neither toxic solvents such as benzene, esters, ketones, which are highly toxic in gravure inks, nor toxic metals in offset inks. In order to protect the environment and human health, food, medicine, household cosmetics and packaging materials that are directly in contact with the human body are all expressly required to use flexographic printing. These measures are highly valued in developed countries such as the United States and Western Europe, and flexo printing is known as green and safe printing. Therefore, flexographic printing has been developing rapidly in recent years.
The continuous updating and development of flexographic printing technology, its advanced technology solves the problem that the film structure is not conducive to printing, and promotes its own development. Consumers will use flexographic packaging products as a priority choice. Although flexo printing is more prone to wear than gravure printing, it is difficult to maintain stable printing quality for large prints. However, in the field of medium and short batch printing, the overall cost of flexographic printing is lower than that of gravure printing, which is why flexographic printing can quickly occupy the market.
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