Basic structure and form of flexographic printing press
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Basic structure of flexographic printing press
Like other presses, flexographic presses are also available in unwinding, printing, drying, and rewinding. The respective configurations of the flexographic printing press will be described in detail below by way of example of a laminated flexographic printing press.
Basic form of flexographic printing press
Simply put, the flexographic printing press is currently divided into three types: stacked, united, and satellite.
Cascading flexographic printing press
Cascading is the simplest and cheapest way to print. It is also the most popular flexographic printing machine in the current flexo printing market in China.
A stacked (also superimposed) printing press is a device that assembles a plurality of powerful printing units one above the other. In the splicing flexo printing machine, each printing unit has its own corresponding impression cylinder, and the printing units are independent of each other, arranged up and down, and occupy a small area.
At present, there are also manufacturers in the Yangtze River Delta to produce cascading flexographic printing presses, and have absorbed foreign self-adhesive label printing equipment to enter the label printing industry. The cascading flexographic printing press has the advantages of small footprint, simple operation, and low price. However, its shortcomings are also outstanding, mainly because the overprinting accuracy is low, only ±0.5mm, which cannot be used for printing high-precision packaging products. The speed is slow, due to the structure and drying reasons, the fastest 70m / min, some machines can also achieve 100m / min monochrome printing.
Unit type flexographic printing machine
The unit type flexo printing machine is the same as the popular gravure printing machine in China, and adopts the unit arrangement. At present, manufacturers at home and abroad have proposed a platform concept, in which the printing color group or functional color group can be interchanged at will, and the process is freely exchanged, which is very flexible. With the introduction of the first equipment in the 1990s, there have been more than 500 unit-type flexographic printing presses imported and produced in China. And it will increase by more than 50 per year. The unit type flexographic printing machine has a wide range of printing substrates and is easy to operate. The overprinting accuracy is within ±0.2mm, and the printing speed is in the medium speed range, which is basically within 220m/min. However, the unit type flexographic printing machine is widely distributed below 600mm, and is often referred to as a narrow-width flexographic printing machine in the industry. The unit type flexographic printing machine is mainly used for products with higher added value such as cigarette packets and self-adhesive labels.
The biggest advantage of the unit type flexo printing machine is that it can adjust the individual units and increase or decrease the number of processing units. It can be said that the unit type flexo printing machine is the most attractive technology when the multi-process combination technology is combined. In the following lessons, we will also explain in detail the multi-process combination technology.
Satellite flexo brush
The satellite flexo printing machine is a less developed and slower application in the Chinese region, which has a greater relationship with the industry and its historical reasons. The satellite flexo press is an impression cylinder common press, ie there is only one impression cylinder. The paper path of this model cannot be changed, and the printed circuit is short. However, because of the high requirements for the intermediate shared impression cylinder, when the number of units is too large, the machine will be very cumbersome.
However, the advantages of satellite flexo printing are actually very many, except for the advantages of high precision and fast speed. In the printing of large-area color blocks (in the field), there is actually a very big advantage, which is comparable to gravure printing. Since the ceramic anilox roller is used to precisely control the amount of ink to be carried, when printing a large solid color block by the flexographic printing method, it is only required to have an ink amount of about 1.2 g per square meter without affecting the color saturation. Intaglio printing requires 3g/m2 or even higher (there is an article data showing 4~6g/m2). Together with the solvent used, the actual cost is far higher than the flexo printing method. Another advantage is that the user is concerned about the problem - energy consumption, due to the relationship between flexographic printing structure, ink, ink loading, etc., and does not require too much heat, the printed work can be thoroughly dried . Therefore, usually an 8-color flexographic printing machine, under the premise of speed of 300m / min, the electric heating method used does not exceed 80KW / hour. Other printing methods usually require more than 150kw/hour of energy consumption, or even higher. This is a very good news for the current situation of domestic electricity consumption is not optimistic. Of course, satellite flexo presses still have their shortcomings. Mainly in the printing and reduction, although it can be printed to 175 lines of products, but with the increase in related costs, the overall application is still different from offset printing, gravure and so on. When printing high-line products, it is powerless. This is a common problem of flexo printing and the most important place to improve.