Anti-counterfeiting technology is applicable to the packaging and label anti-counterfeiting of high-end products such as securities, certificates, documents, bills and various types of high-grade tobacco, alcohol, food, medicine, and cosmetics. With the development of high technology and people’s requirements for high-quality packaging prints, the packaging and printing industry has begun a wide range of technological revolutions in recent years. The combination of multiple printing equipments and the mutual penetration of multiple printing technologies have made the printing products more changeable. Measurement, rich and colorful. The products printed with these new technologies have created obstacles and resistance for those who are trying to fake. The author will make some simple introductions to the printing process of security labels. ◆Lithograph + relief printing combined with multiple processes The general high-end packaging and decoration printing products have many designs such as large-area color patches, multi-color sequential continuous adjustment screens, and complicated lines and patterns, etc. It is difficult to print ideal results with a single printing method. If the combination of plain printing and embossing is used, a solid color block is printed on a large area with the pressure of the letterpress printing machine and the ink is evenly distributed, and the four-color printing pressure is used to continuously adjust the complicated lines. The effect is more ideal. For some of the more demanding and more complex printing products, printing methods such as embossing, gravure printing, gravure printing, embossing, gravure printing, screen printing, etc. can also be used. In short, the more complex the printing process and the greater the difficulty of printing the packaging, the better the anti-counterfeiting effect. ◆ Multi-color printing Multi-color printing is also called cross-color printing, and it is generally printed by a letterpress printing machine. It is based on the requirements of the printing product, after placing the separator in the ink tank, and then putting a plurality of hue inks in different separators. Under the string action of the skein roller, the adjacent ink is mixed and transmitted to the plate. With this printing process, multiple colors can be printed at one time and the middle transition is soft. Since it is difficult to see the distance of the ink tank partition from the print, it can also play a certain anti-counterfeiting effect. If such a process is applied to large-area shading printing, its anti-counterfeiting effect will be more prominent. ◆ Gravure printing technology On the printing technology plate, the graphic part is raised, the printed ink is also convex, and the graphic lines are clear and distinct, and the touch can feel. This printing technology has both protective and anti-counterfeiting properties for paper. Gravure printing is used for important securities. The types of gravure printing are divided into two categories according to the platemaking method: engraving gravure (hand-engraved gravure, mechanical engraving gravure), and etching gravure. Among them, anti-forgery effect of engraving and gravure printing is better, and it is generally combined with anti-counterfeiting ink technology. Some anti-counterfeiting inks have large pigment particles and require a thicker ink layer to express the printing effect, while gravure printing has a stronger texture. The combination of the two achieves the dual effects of anti-counterfeiting and mounting. Intaglio printing also uses fluorescent ink, which not only guarantees the gravure feeling of gravure printing, but also guarantees the use requirements of fluorescent inks. The anti-counterfeiting functions of both are also guaranteed. Laser holographic iris printing uses laser holography to make a stencil in a shockproof chamber, and then transfers the pattern to some kind of carrier through pressure. Its products are illuminated by a 45-degree point light source and can produce colorful rainbow-like unique effects. The three-dimensional image of the product is extremely strong and is highly favored by consumers. It is known by some people of insight as 21st century ink-free color. Printing. At present, laser holographic iris printing uses cold pressure coating and direct hot stamping. Due to the complexity of the plate making process of this technology, it is very difficult, and only a few domestic manufacturers can produce it, so the anti-counterfeiting effect is excellent. It should be particularly pointed out that holography is the use of laser light source in the shock chamber to capture the amplitude information and phase information of the scene light waves in a very short time, and uses the principle of interference of light to form each mass point of the scene to form all the information. In the plate making process, the fine air movement in the room can cause the color change of the holographic image. Therefore, it is impossible to make two identical hologram plates anyway. ◆ hand-carved version of imprint Most packaging and decoration prints require highlighting texts such as brand names and patterns. These graphic highlights are mostly made by chemical etching, and are printed on the machine with a gypsum intaglio. Although this method has the advantages of simple manufacturing process, short cycle, etc., but after the embossing bump effect is not good, does not have anti-counterfeiting effect. Therefore, there are many printing plants using engraving engraving process. The hand-carved version requires the use of a copperplate material with a good texture. The graphic arts (mainly patterns) required by the user are carved out of the layers by means of the manual craftsmanship of the engraver, and can generally be carved out in 3 to 4 levels. In particular, it should be pointed out that the chemical etching method can only make a level, and the corners of the edge can not be made like a certain degree of curvature of the hand to increase the embossing effect and prevent the paper from cracking. Since the craftsman's skill is not grasped within a short time, and different engravers have different carving styles, even the same engraver can't draw two identical templates. Therefore, it is stamped with such a template. Packaging printing products not only has good embossing effect, rich layers, high stamping rate, but also has a strong anti-counterfeiting effect. ◆ special glossy printing Special glossy printing is a new type of printing technology that has become more popular in the packaging printing industry in recent years. The special glossy printing process currently consists of metallic luster printing, pearlescent printing, pearl luster printing, dioptric printing, variable gloss printing, laser holographic iris printing, crystal luster printing, imitation metal etching printing and matte printing, etc.: · Metal luster printing is the use of aluminum foil metal composite paper, with a more transparent ink, the formation of special metallic luster effect on the print; ·Pearl printing is the first printing of silver paste on the surface of the print, followed by a very transparent ink, the silver glitter reflects a pearlescent effect through the ink layer; ·Pearl luster printing is the use of ink mixed with mica particles, so that the printing produces a similar pearl, shellfish gloss effect; ·Refractive printing is the unique effect of using a refraction plate to imprint the pattern on the printed product with a certain pressure to produce light refraction; • Matte printing uses matte ink printing or ordinary ink printing and then covers the matting film, which can produce the weak luster feature of enamel, so it also has a relatively safe anti-counterfeiting effect.
â—† Laser holographic iris printing