Rotary screen printing technology has many advantages compared with flat screen printing equipment, especially it can form a high-speed production line with flexo printing equipment, relief printing equipment and offset printing equipment, greatly improving production efficiency. The following will take Gallus's several new rotary screen printing equipment as an example to systematically analyze the characteristics of rotary screen printing.
Flat screen defects
The flat screen is usually made of polyester screen stretched on the screen frame. In order to obtain good edge sharpness and image details of the printed product, a certain gap must be left between the screen and the substrate during printing. In the middle, the screen is under pressure and comes into contact with the substrate, the rubber scraper moves, and the ink below the screen moves to the surface of the substrate; at this time, there is still some ink in the pores of the screen. On the print, make the image dirty or blurry.
Another problem with flat screen printing is that the rubber squeegee presses and moves the screen to make the ink transfer, and at the same time it also stretches the screen and image. The closer the squeegee is to the edge of the plate, the greater the elongation will Causes some distortion and distortion of the image, causing printing distortion.
However, in the rotary screen printing, since the screen is in the form of a cylinder, and the screen and the substrate are in line contact, image distortion during the printing process can be avoided.
Online printing
Is flat screen printing useless? it's not true. It is very convenient and practical in many fields, such as lottery tickets, cards and other printing fields, which is impossible for rotary screen printers. However, most areas are still suitable for rotary screen printing.
The rotary screen printing machine has certain standards in design, and has the ability to connect with web printing equipment (such as rotary letterpress printing machine, flexo printing machine or offset printing machine) on the production line. This roll-to-roll online printing method is often used for packaging and trademark printing, personal health card printing and beverage trademark printing, etc. It can also be used for transparent plastic film printing or advertising printing.
Online printing allows users to make full use of the ink deposition characteristics and high-precision resolution characteristics of different printing plates. If the customer wants to get 30μm thick UV ink, then the rotary screen printing machine can meet this requirement, because the rotary screen printing can provide an ink layer thickness of 20 ~ 30μm; if the customer requires very fine image printing or high resolution dots Printing, then flexo or offset printing is the best choice, and these can be through online, play to the advantages of various printing technologies, to achieve the widest production capacity.
In terms of the heavy characteristics of printing inks, the use of online technology can produce opaque prints and colorful prints. The specific process combination is to print high-definition images with flexo or offset printing, and to print the background color or bright field with rotary screen printing.
For coarse screen and special ink printing, including gold and silver ink, thermochromic ink, electronic fluorescent ink, etc., it is best to choose rotary screen printing. This printing method can also print tactile images, such as Braille. The protective glue and coating of the screen plate have chemical resistance and oxidation resistance, and can be suitable for many special inks.
Rotary screen printing equipment
There are few manufacturers of rotary screen printing equipment in the world, and two of them have a large market share: one is the Swiss Gallus company and the other is the Stork company headquartered in the Netherlands. the same.
Gallus can produce rotary screen printing machines and online equipment. The online equipment includes letterpress printing machines, flexographic printing machines and offset printing machines. One or more rotary screen printing units, hot stamping devices and die cutting devices can be configured in the online equipment. Typical models are:
R200 screen printing model, printing format 8 inches (203mm), can be connected with letterpress printing equipment, UV glazing equipment, web printing equipment and curing equipment.
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