Anti-counterfeiting technology is suitable for packaging and label anti-counterfeiting of securities, certificates, official documents, bills, and various high-end commodities such as cigarettes, alcohol, food, medicine, cosmetics, etc. With the development of high technology and people's demand for high-quality packaging and printing products, the packaging and printing industry has begun a large-scale technological revolution in recent years. The combined use of multiple printing equipment and the mutual penetration of multiple printing processes have made printed products more unpredictable. Test, colorful. The products printed with these new technologies set up layers of obstacles and resistance for trying to be counterfeiters. The following is a brief introduction to the printing process of anti-counterfeit labels.
â—† Lithography + relief printing combined with multiple processes
Generally, high-end packaging decoration printed products are designed with large-area color blocks, multi-color sequential continuous adjustment screens, and complicated lines and patterns, etc. It is difficult to print the ideal effect with a single printing method. If the combination of offset printing and relief printing is used, that is, the solid color blocks are printed on a large area with the advantages of high pressure and uniform ink in the relief printing machine, and the four-color continuous and complex line parts are printed with the soft pressure of the offset printing machine. The effect is more ideal. For some of the more demanding and more complex printed products, you can also use a combination of printing methods such as embossing, gravure and flat printing, embossing, gravure, and silk printing. In short, the more complicated the printing process and the more difficult the printing is, the better the anti-counterfeiting effect.
â—† Multi-color printing
Multi-color cross-printing is also called cross-color printing, and is usually printed by a letterpress printing machine. It is based on the requirements of the printed product, after placing the separator in the ink tank, and then putting different colors of ink in different separators. Under the serial action of the inking roller, the ink in the adjacent parts is mixed and then transferred to the printing plate. Using this printing process, you can print multiple colors at once, and the middle transition is soft. Since it is difficult to see the placement distance of the ink tank partition from the printed product, it can also play a certain role in anti-counterfeiting. If this process is used for large-area shading printing, its anti-counterfeiting effect will be more prominent.
â—† Gravure printing technology
In the printing technology, the graphic parts on the printing plate are convex, and the ink on the printed graphic is also convex, and the graphic lines are clear, the layers are clear, and you can feel it when you touch it. This printing technology not only protects the paper, but also has anti-counterfeiting properties. Important securities use gravure printing technology.
The types of gravure printing are divided into two types according to the plate making method: engraved intaglio (there are hand-engraved intaglio and mechanically engraved intaglio), and corrosion intaglio. The anti-counterfeiting effect of engraved gravure printing is better, and it is generally combined with anti-counterfeiting ink technology. Some anti-counterfeiting inks have larger pigment particles and require a thicker ink layer to reflect the printing effect, while gravure printing has a stronger texture. The combination of the two achieves the dual effect of anti-counterfeiting and decoration.
Fluorescent inks are also often used in gravure printing, which not only guarantees the slight convexity of gravure printing, but also ensures the use of fluorescent inks. Both anti-counterfeiting functions are also guaranteed.
â—† Laser holographic iris printing
Laser holographic iris printing is to use laser holography to make a template in a shockproof room, and then transfer the pattern to a certain carrier by pressure. Under the illumination of 45-degree point light source, its products can produce the unique effect of rainbow-like colors, and the three-dimensional sense of the image is very strong. It is favored by consumers and is known as the inkless color of the 21st century by some people of insight. Typography.
At present, laser holographic iris printing mostly adopts two processes: cold pressure coating and direct hot stamping. Due to the complex and difficult platemaking process of this technology, only a few domestic manufacturers can produce it, so the anti-counterfeiting effect is excellent. It should be particularly pointed out that holography uses a laser light source to capture the amplitude information and phase information of the scene light wave in a very short time in the shockproof room, and uses the principle of light interference to form each particle of the scene to form all the information. During the plate making process, the slight air flow in the room can cause the color of the hologram to change, so it is impossible to make two identical hologram plates anyway.
â—† Hand-engraved plate imprint
Most packaging decoration prints require key words such as trade names and patterns to be raised. Most of these graphic protrusions are made by chemical etching method, and then they are combined with gypsum intaglio to complete the printing. Although this method has the advantages of simple manufacturing process and short cycle, but the embossing effect after imprinting is not good, and it has no anti-counterfeiting effect. Therefore, many printing plants currently use engraved plate imprinting process. The hand-carved version needs to use the copper plate material with better texture. The engraver's manual skills are used to carve the graphics (mainly patterns) required by the user with a carving knife. It should be particularly pointed out that the chemical etching method can only make one level, and the dead angle of the edge part can not be made into a certain arc like manual engraving to improve the embossing effect and prevent the paper from cracking. Because the skills of the engraver are not masterable in a short time, and different engravers have different engraving styles, even the same engraver cannot engrave two identical templates, so the imprinted with this template Packaging printed products not only have good embossing effect, rich layers, high embossing rate, but also have strong anti-counterfeiting effect.
â—† Special gloss printing
Special gloss printing is a new and popular printing technology in the packaging and printing industry in recent years. The special gloss printing process currently mainly includes metal gloss printing, pearlescent printing, pearl gloss printing, refractive printing, variable gloss printing, laser holographic iris printing, crystal gloss printing, metal imitation etching printing and matte printing, etc .:
· Metallic gloss printing is to use aluminum foil metal composite paper, with a relatively transparent ink to form a special metallic gloss effect on the printed product;
· Pearl printing is to first apply silver paste on the surface of the printed product, and then use extremely transparent ink. The silver glitter flashes through the ink layer to refract a pearl effect;
· Pearl gloss printing is the use of ink mixed with mica particles to make the printed matter produce a gloss effect similar to pearls and shellfish;
Refractive printing is the unique effect of refracting the pattern on the printed product with a certain pressure by using a refractive plate;
Matte printing is to use matte ink printing or ordinary ink printing and then covered with matte film, which can produce hazy weak gloss characteristics, so it also has a safer anti-counterfeiting effect.
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