Basic structure and form of the most popular flexo

2022-08-08
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The basic structure and form of flexographic printing machine

like other printing machines, flexographic printing machine also consists of uncoiling part, printing part, drying part and rewinding part. The following will take the laminated flexographic printing machine as an example to explain each structure of the flexographic printing machine in detail

the basic form of flexographic printing press

simply speaking, flexographic printing presses currently have three structures: layered, unit and satellite

laminated flexo printing machine

laminated flexo printing is the simplest and cheapest flexo printing method. It is also a flexographic printing machine with the largest share in the domestic flexographic printing market

laminated (also known as superimposed) printing machine is a device that assembles multiple powerful printing units in the form of up-down combination layer by layer. In the laminated flexographic press, each printing unit has its own corresponding embossing cylinder, and its printing units are independent of each other, arranged up and down, and cover a small area

at present, the largest concentration of such flexographic printing machines in China is in the Pearl River Delta region. In the early stage, Hong Kong enterprises imitated Japanese models and began to sell them in China in the 1980s following the national reform and opening-up policy

it is mainly used for the printing of portable shopping bags, vest bags, simple clothing bags, external packaging of electronic components and other products. Due to the time and price of gravure plate making at that time, the laminated flexographic printing machine developed rapidly with the advantages of fast plate making time, low price and low product unit price. Then in the 1990s, domestic laminated flexographic printing machines began to appear, and gradually replaced the laminated flexographic printing machines produced by Hong Kong businessmen. From the late 19th century to the early 20th century, there were more than 3000 such laminated flexographic presses in the Pearl River Delta, ranging from monochrome, two-color to ten color. At present, there are also manufacturers in the Yangtze River Delta producing laminated flexographic printing machines, and after absorbing foreign self-adhesive label printing equipment, they have entered the label printing industry. The laminated flexographic printing machine has the advantages of small floor area, simple operation and low price. However, its shortcomings are also prominent, mainly due to the low overprint accuracy, only ± 0.5mm, which can not be used to print high-precision packaging products. The speed is slow. Due to the structure and drying reasons, the fastest speed is 70m/min, and the monochrome printing of some machines can also reach 100M/min

unit type flexographic printing machine

unit type flexographic printing machine, like the current domestic popular gravure printing machine, adopts the unit arrangement and combination mode. At present, manufacturers at home and abroad have put forward a platform concept, on which printing color decks or functional color decks can be interchanged at will, so as to meet the needs of process random exchange, which is very flexible. With the introduction of the first domestic equipment in the 1990s, there have been more than 500 imported and domestic unit flexographic presses in China. And it will increase by more than 50 units every year. The unit type flexographic printing machine has a wide range of printing substrates, convenient operation, overprint accuracy within ± 0.2mm, and the printing speed belongs to the medium speed range, which is basically 2 to facilitate uniform heat dissipation within 20m/min. However, the width of the unit flexographic printing machine is concentrated below 600mm, which is often referred to as the narrow flexographic printing machine in the industry. The unit flexographic printing machine is mainly used for cigarette packs, self-adhesive labels and other products with high added value

the biggest advantage of the unit type flexographic press is that it can adjust the individual unit to increase or reduce the number of processing units at the same time. It can be said that the online multi process combination technology is the most attractive technology of the unit type flexographic press. In the later courses, we will also explain the online multi process combination technology in detail

satellite flexographic printing machine

satellite flexographic printing machine is less applied and develops slowly in China, which has a lot to do with the understanding of the industry and historical reasons. Satellite flexographic printing machine is a public type printing machine with an impression cylinder, that is, there is only one impression cylinder. The paper route of this model cannot be changed, and the printing line is short. However, due to the high requirements for sharing the imprinting drum in the middle, when the number of units is too large, the machine will appear very cumbersome

however, satellite flexographic printing has many advantages, in addition to the advantages of high overprint accuracy and high speed. In fact, it has great advantages when printing large-area color blocks (on the spot), which is comparable to intaglio printing. Because the ceramic roller is used to accurately control the ink load, when printing large field color blocks by flexographic printing, it only needs about 1.2g ink per square meter without affecting color saturation. Intaglio printing requires 3g/m2 or even higher (some article data show that 4~6g/m2), plus the supporting solvents, the actual cost of ink use alone is far higher than that of flexo printing. Another advantage is that users should pay attention to the problem of energy consumption. Due to the relationship between flexographic printing structure, ink, inking volume and so on, it does not need too much heat energy. After printing, the ISRI delegation can go to Beijing to meet with Chinese government officials to get more detailed live parts to dry thoroughly. Therefore, generally, an 8-color flexographic press, with a speed of 300m/min, uses an electric heating mode with a power of no more than 80kW/h. Other printing methods usually require more than 150kw/hour of energy consumption, or even higher. This can be said to be very good news for the current domestic power consumption situation is not optimistic. Of course, satellite flexographic printing machine still has its shortcomings. Mainly in the aspect of printing restoration, although the products can be printed to 175 lines, with the increase of related costs, the overall application still lags behind offset printing and gravure printing. When printing products with high line count, it is powerless. This is a common problem of flexo printing, and it is also the place that needs to be improved most

source: Guangzhou Feva company

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