Rotary Screen Printing Technology in Label Printing

With the increasingly fierce competition in the consumer goods market, more and more manufacturing companies adopt marketing methods that use attractive labels and packaging to attract consumers to purchase desires. This has accelerated the development of label printing. The continuous increase in labeling requirements of product manufacturers has led to the continuous updating of label printing technologies, which are characterized by increasingly complex printing processes, increasingly diversified materials, and increasingly short-term orders. In this situation, rotary screen printing, as a special printing process, has become increasingly prominent in the field of label printing.

1 Principle of Rotary Screen Printing

The rotary screen printing system is composed of a plurality of independent monochrome printing units, suitable for printing of various widths of printing materials, and can enable synchronized production lines to be integrated with intelligent control. The rubber squeegee is installed inside the screen roller. The ink is added into the roller from the side. When the printing material of the reel is in contact with the rotating plate roller, the squeegee presses the ink and makes it pass through the nickel wheel. The mesh penetrates onto the substrate supported by the impression cylinder to form an image. Among them, the screen plate, the substrate and the impression cylinder rotate at the same linear velocity to form a "frictionless" system. The pressure on the printing material can be adjusted by the impression cylinder behind the printing material. The thickness of the ink layer transferred to the printing material can be controlled by selecting different screen sizes or adjusting the pressure of the squeegee.

The screen printing platemaking process is also relatively simple: First, the screen plate is coated with a liquid water-based emulsion to block all the meshes, and then the screen plate is dried in a drying oven; A positive image with a printed image is wound on a screen-printing roller coated with an emulsion and exposed with a UV light source. After the exposure is completed, the screen plate is rinsed in an automatic processor and the unexposed emulsion is rinsed. When you leave, you will leave a teletext section.

2 Rotary Screen Printing Features

In the middle of the last century, the Dutch company Stork invented rotary screen printing technology. In the following decades, rotary screen printing technology was widely used in textile printing, wallpaper, and floor printing. Stork has advanced and independent screen printing workstations that can be easily connected to any kind of rotary printing equipment. Its unique honeycomb screen printing plate makes the screen printing technology achieve unprecedented diversity.

Rotary screen printing has revolutionized traditional screen printing technologies in many aspects. Traditional screen printing equipment has many limitations in the process, especially in large-area printing, the printing materials are easily deformed, and the printing accuracy is not high. It is more difficult to guarantee the quality of the printing products for multi-color printing, and the screen printing for The above shortcomings have been improved.

1) The screen is changed from a flat form to a roller form, and a nickel metal round screen plate is used. A built-in squeegee and an automatic ink supply system are used. The entire printing process is fully controlled by a computer and the operation is very simple.

2) Replace the traditional weaving screen with a honeycombed metal screen. The entire screen is evenly thin to ensure the stability and precision of the printing.

3) Rotary screen printing can not only meet the requirements of special effects such as printing frosting and ice flower, but also can be used for hot stamping holographic anti-counterfeit labels, embossing and die-cutting molding. It is widely used in the field of label printing.

4) The printing equipment is compact and highly efficient with high precision. Thanks to the advanced independent drive, independent registering shaftless transmission system, multiple sets of printing units can be formed, and it is also possible to easily form a combined printing with a narrow or wide web rotary printing press using a modular design structure.

Compared with flat screen printing, rotary screen printing has the following features: continuous production, high efficiency; continuous supply of printing materials, small deformation, and with a printing material correction system, high registration accuracy; can be multi-unit color printing; For large-scale production, high yields.

3 Rotary Screen Printing Application in Label Printing

1) Flexo and rotary screen printing combined transparent labels

Transparent labels, also known as crystal labels, first originated in the United States and later in Europe. They are currently attracting keen attention from domestic end-users. A transparent sticker is attached to transparent glass bottles or PET bottles. Clear and transparent labels combine with crystal clear bottles to create a crystal-clear, label-free effect, giving consumers a high-grade, fresh, clear finish. a feeling of.

Flexo and rotary screen printing groups and printing methods are mainly used to print such transparent labels. In the printing process, the rotary screen printing unit is generally arranged in the first color group, first printing a layer of white ink on the printing material, then printing other colors with flexographic printing; Screen printing unit, which can print the white ink on the bottom, but also can print other colors, and the printed text and lines are more eye-catching and three-dimensional.

2) Embossing and Rotating Screen Printing Sets and Printed Labels

Embossing and rotary screen printing groups and printing are mainly used to print various labels. It is possible to first print white ink and then print other colors in the first color. It is also possible to mount two or more on one embossing machine. Rotary screen printing unit, in addition to printing white ink, can also print other colors, playing a certain anti-counterfeiting effect.

3) Rotary screen printing RFID electronic tags

With the higher and more complete information needs of packaging companies for product production, storage, transportation, security, anti-counterfeiting and management, smart labels are gradually being promoted and used. At present, the much-publicized tag antenna printing has gradually turned to the application research of rotary screen printing technology in foreign countries. An antenna that prints RFID tags with conductive ink can be directly printed on materials such as PET without the need for further etching or other processes. The label antenna printed by rotary screen printing has high precision and thick ink layer, which can fully meet the requirements of the label enterprise on the quality of the antenna. Moreover, the minimum weld spacing of 3 mm for seam screen printing in the rotary screen printing machine saves a lot of costs for the enterprise.

4 Advantages of Rotary Screen Printing Labels

Rotary screen printing has the following advantages in label printing: strong printing color, good coverage effect; can achieve ice flower and frosted effect; good bottoming effect, can be used for printing thin film materials; fine lines, can achieve micro anti-counterfeiting; can achieve seamless Bonding pattern; Gradient effect is good; imitation hot stamping effect is good.

Rotary screen printing equipment has the characteristics of flexibility, not only can provide excellent printing units, to achieve connection with any roller equipment production, to make up for the defects of a single printing process, can also provide the entire screen printing production line. Rotary screen printing is applicable to the printing of various printing materials, and can achieve fine print lines, bright characters, strong three-dimensional effects, and good anti-counterfeiting effects. With the rapid development of the label industry and the increasing demand for anti-counterfeiting in the consumer goods market, rotary screen printing will surely be applied more widely.

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