Rotary screen printing has always been the top screen printing method, and its printing efficiency is even more unmatched by ordinary plane screen printing, printing accuracy, and the continuity of printing are even better.
In the label printing industry, in order to effectively improve the anti-counterfeit effect and the diversity of products, web screen printing with the label printer has gradually been promoted. For a long time, the effect of silk screen printing by label printing companies is mainly due to off-line printing on flat screens.
Because flat screen printing presses and rotary label printers cannot be printed on line, there are cases where the printing efficiency is low and the position is inaccurate. What is more important is that some screen printing effects cannot be achieved by flat screens, such as Use screen printing for background color or screen printing for intermediate colors. Therefore, rotary screen printing becomes a better choice.
Rotary screen printing main features
First, it can be printed with any type of rotary label printing, high efficiency, accurate nesting. The printing speed is high, the actual printing speed of the rotary screen printing unit can reach 135 meters/minute;
Second, the printed ink layer is thick, hiding power is good, and the effect is obvious in transparent label printing;
Third, the use of low cost: Because you can connect printing, eliminating the waste of paper.
The ink is printed on the paper under the pressure of the squeegee through a stencil stencil that rotates synchronously with the paper. In this process, the paper rotates synchronously with the stencil stencil, without friction, and the service life of the stencil is improved; the screen during the printing process The principle of no deformation of the reticle results in a much smaller deformation of the print than flat screen printing.
Rotary screen printing machine classification and selection
Rotary screen printing machines can be divided into two categories according to equipment:
1. Interchangeable units with the flexo, letterpress or offset printing units on the printing machine, which are mainly plug-in screen printing units that come from some well-known foreign label printer manufacturers, such as Gallas and Niubei. Thai, Mai Andy and some other brands, this screen printing unit uses the host's power and registration system, printing can be flexibly selected screen printing location, easy to operate. The print perimeter of such a screen printing unit typically ranges from 12 inches to 18 inches.
Printing speed is within 100 meters/minute. The printing units of each printing host are different from each other and cannot be interchanged. Since the screen printing unit does not have a power and registration system, it cannot be printed off the host.
2. Another is a screen printing unit with its own power and registration system, such as RNP and STORK printing units. The silk screen unit can be flexibly installed on different rotary presses because of its small size and high speed: maximum speed of 150 m/min, with independent servomotor and register system, just coding from the printing machine The machine reads the mechanical speed and registers itself with the cursor alignment system to achieve automatic synchronization printing. The installation is simple and the operation is easy. Both satellite and crew rotary presses can be retrofitted. (To be continued)
