Rotary screen printing has always been the top screen printing method, its printing efficiency is unmatched by ordinary flat screen printing, printing accuracy, and printing continuity are superior. In the label printing industry, in order to effectively improve the anti-counterfeiting effect and product diversity, the rotary screen printing connected to the label printing machine has been gradually promoted. For a long time, the label printing enterprises should achieve the effect of screen printing mainly by offline printing on flat screen. Since the flat screen printing machine and the rotary label printing machine cannot be connected for printing, this results in low printing efficiency and inaccurate registration. More importantly, some screen printing effects cannot be achieved by flat screen printing, such as Use screen printing as the base color or screen printing as the intermediate color. Therefore, rotary screen printing has become a better choice. Main features of rotary screen printing 1. It can be connected with any form of rotary label printing, with high efficiency and precise positioning. The printing speed is high, and the actual printing speed of the rotary screen printing unit can reach 135 m / min; 2. The printed ink layer is thick and has good hiding power, which has obvious effect in transparent label printing; 3. Low cost of use: Because it can be connected for printing, it saves paper waste. Classification and selection of rotary screen printing machine Rotary screen printing machine can be divided into two categories according to equipment: 2. The other is a screen printing unit with its own power and registration system, such as RNP and STORK printing units. The reason why the silk screen unit can be flexibly installed on different rotary presses is because of its small size and high speed: the maximum speed is 150 meters / minute, with an independent servo motor and registration system, only need to be coded from the printing host The machine reads the mechanical speed, and realizes automatic synchronization printing by registering with its own cursor alignment system. It is simple to install and easy to operate. Both satellite and unit rotary presses can be installed. Install the screen printing unit correctly If the printing manufacturer has already purchased a rotary printing press and needs to install a screen printing unit, the latter model will be more suitable. But when installing this type of screen printing unit, you need to pay attention to these issues: one is the location of the installation, and the other is the problem of drying. It is relatively simple to add a screen printing unit to a rotary press of a unit type. It can also be reserved for installation by the manufacturers of rotary machines. It is also relatively simple to install on the existing rotary machine: you can use the wall plate of the rotary machine to build a mounting bracket on the existing printing machine to lead the paper from the existing printing color group to the screen printing unit for silk Screen printing, and then the paper is led back to the rotary machine, this way can use the UV drying device on the rotary machine (provided that the UV power on the rotary machine is appropriate). When installing the bracket, the bracket can also be designed as a rail, so that the screen printing unit can move on the rail, which is convenient for selecting screen printing in any color. The materials of rotary screen printing machine are mainly screen and ink The screen of the rotary screen printing machine includes these parts: screen, end ring, gear and plate making. Special plate-making equipment is required for plate-making. Stainless steel braided mesh is more convenient when printing, generally adopt flat printing, and then bonded into a round screen, generally can not repeat printing. Its mesh thickness is generally below 60 microns, and its strength and printing life are relatively small. The ink used in the rotary screen printing machine is a special UV ink, and there is a certain difference from the ink for flat screen printing. Ink is mainly divided into two kinds of silicon-containing and non-silicon-containing: silicon-containing ink can not be used for screen printing, mainly used for the printing of text and patterns on the surface. In the end, each printing company will consider the cost. The cost of installing a rotary screen printing unit mainly includes these aspects: equipment cost, screen and plate making cost during printing, and ink cost. With the development of rotary screen printing in China in recent years, there are already different products and manufacturers on the market for everyone to choose from. The content described above hopes to enable the majority of users to provide assistance in understanding and selecting rotary screen printing.
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The ink is printed on the paper through the screen cylinder rotating synchronously with the paper under the pressure of the scraper. In this process, the paper and the screen cylinder rotate synchronously without friction, which increases the service life of the cylinder; the screen during the printing process The principle that the plate cylinder does not deform makes the deformation of printing much smaller than that of flat screen printing.
1. Interchangeable unit with flexo, letterpress or offset printing unit on the printing host, this is mainly a plug-in screen printing unit that comes with some well-known foreign label printing machine manufacturers, such as Jielas, Niebo For some brands such as Thai and McAndy, this screen printing unit adopts the power and registration system of the host, and the position of the screen printing can be flexibly selected during printing, and the operation is simple. The printing perimeter of this screen printing unit generally ranges from 12 inches to 18 inches. The printing speed is within 100 meters / minute. The screen printing units of each printing host are different and cannot be interchanged. Since the screen printing unit does not have a power and registration system, it cannot be separated from the host for printing.
Install the silk printing color set on the satellite rotary printing machine, generally between the large wheel and the unwinding and rewinding position. At this position, the rotary machine manufacturer can reserve the installation position. Lengthen the base and wall panels. When installing in this position, you can choose whether the silk screen is used to print the first color or the last color through the change of the paper. There is another way to install satellite rotary machine is to lead the paper from the bottom of the big wheel to the left side of the big wheel before entering the big wheel. Put the screen printing unit in this place. After printing, return the paper to the big wheel Paper feed position, so you can also choose whether to print the first color or the last color. The shortcoming of this installation method is to increase the length of the paper.
Rotary screen printing generally uses UV ink, so the drying method uses ultraviolet UV lamp drying. The printing ink layer of the rotary screen machine is much thicker than that of flexo and letterpress, so the power of the UV lamp used is also relatively large. Generally, the power of UV lamp is above 200W / cm. Taking the printing width of 250mm as an example, the power of the UV lamp should be above 5 kilowatts, generally 7 kilowatts.
There are two types of screens for rotary screen printing machines, one is a braided stainless steel screen coated with photosensitive adhesive, and the other is an electroformed nickel screen without coating of photosensitive adhesive.
The thickness of the electroformed nickel mesh is generally above 80 microns, and the structure of the electroforming method increases the strength of the wire mesh. When making the screen, the silk screen and the end ring are first adhered to the round screen, and then coated with a photoresist printing plate. This screen can be used for repeated printing, which greatly saves printing costs. 