With the intensification of competition in domestic and foreign markets, in order to meet users' increasingly stringent requirements on the quality of packaged products, the application of special printing in the post-press processing of packaging and printing products is becoming more and more widespread. In order to further improve product individuation, many manufacturers In addition to the development and application of new special technologies, the original processing technology will be combined with special inks and special materials to form new special printing technologies, thereby enhancing the competitiveness of the products in the market. At present, during the post-press processing of packaging and decorating, more advanced special printing processes have been applied to post-press processing such as cigarette packs.

Hot Stamping Technology

Holographic hot stamping technology is one of the more secure and successful anti-counterfeiting measures that are currently being certified worldwide. The holographic hot stamping process uses a large number of holograms, and the hologram stamped on the substrate is very thin, and it is integrated with the substrate. As one, with its printing patterns and colors on each other, you can get very good visual effects. According to the different hot stamping process, holographic hot stamping can be roughly divided into 3 types, namely, low-speed holographic hot stamping, fast random holographic hot stamping And high-speed positioning holographic hot stamping. Among them, high-speed positioning hologram hot stamping technology has the highest requirements and the greatest anti-counterfeit strength. It is necessary to ensure that the hologram is completely and accurately stamped at a specified position with high production efficiency, and the positioning accuracy is not less than ±0.25 mm. Holographic positioning hot stamping adopts corresponding anti-counterfeit patterns and special techniques. By using holographic positioning probes, it can precisely control the electrochemical aluminum, and the quality of bronzing is high. It has reached consensus in the world. As holographic aluminum manufacture is more difficult, there are fewer manufacturers and the process is complicated, so the cost is higher.

Cold foiling technology is a brand new bronzing process that does not require the use of a heated metal silver plate. Instead, the adhesive is applied directly to the decorative graphic and the galvanized aluminum is attached to the printed surface. Cold foil stamping is usually processed by round press method, and the hot stamping speed is fast, but the hot stamping surface effect and firmness are poor, so the printed matter also needs to be coated or coated. The cold bronzing process has low cost, energy saving and high production efficiency. At present, some cigarette factories on the market have eliminated the paper packaging for cigarette packs and replaced them with color films to reduce packaging costs. Using cold gilding technology, similar hot stamping effects can be made on paper and film to increase the attractiveness of cigarette packs.

The first hot stamping is the new idea of ​​the printing industry and the smoke label design. The first hot stamping is the first hot stamping of silver foil on the white card paper, and the printing of the graphic on the surface of the hot stamping silver foil is a large-area hot stamping technology. This processing method usually uses a round press or a round press hot stamping machine. When the hot stamping pressure is a line contact method, when a large area of ​​hot stamping, unlike the flat stamping hot stamping, bubbles appear, and the hot stamping surface is very smooth. At the same time, full-size stamping does not increase the load on the machine.

Three-dimensional hot stamping is the use of corrosion or engraving technology to create a matching hot and cold stamping concave and convex graphics and positive mold, hot stamping and embossing to achieve a complete process. This process also completes bronzing and embossing at the same time, which reduces the waste generated from overprinting of the processing process, and improves the production efficiency and product quality. Stereoscopic hot stamping often adopts high-pressure hot stamping embossing materials, which can display different colors when viewed at different angles, achieving ideal anti-copying and anti-counterfeiting functions. Mask the subtle levels of the graphic to avoid falsification and falsification of the file. Three-dimensional hot stamping can use flat-flattening, round-flattening and round-circular hot stamping die-cutting machines, and the hot stamping uses corroded copper plates or carved brass plates. The corroded copper plate is used for flat stamping and has a short service life of 100,000 times. The life of the carved brass plate can reach 1 million times. It is suitable for long-lived, and the stamping is of good quality.

Gravure engraving technology

Advanced engraving and gravure plate making and printing technology Printed prints with thick striated ink layers, heavy colors, a certain luster on the lines protruding from the paper, and a special bulging effect on some patterns, using the tactile sensation The feeling is that it is easy to identify the raised gravure pattern, simply touch the pattern with your fingertips to confirm its feel. At the same time, its obvious bulges, thick and vivid colors, and fine continuous line patterns all give people a unique sense of vision. This is the appearance of these ordinary offset printing can not reflect the effectiveness of its anti-counterfeiting lies. Engraving and gravure printing is not only a traditional technology of security defense, but also an effective and reliable carrier such as magnetic and infrared absorption machine reading features.
New Screen Printing Technology

Screen printing has the characteristics of thick ink layer, rich graphic layers, strong three-dimensional sense, and wide printing materials, etc. The application of high-grade tobacco and alcohol, food packaging cartons has gradually increased. The use of UV screen inks to print frosted, refraction, ice, wrinkles and other effects on cigarette packs has greatly stimulated consumers' desire to purchase. However, due to the flat press screen printing method with low printing speed, slow ink curing speed, difficult to control printing quality, and large consumption of printing materials, it is unable to meet the needs of cigarette cartons for scale and mass production. High-speed rotary screen printing production line has high printing speed, high productivity, stable quality and low consumption of printing products. It has changed the traditional flat-press screen printing manual feeding and ink supply methods. It is suitable for high-speed automatic and large-scale mass production of fine folding. Paper box.

Web Rotation Screen printing uses a nickel metal round screen plate, a built-in doctor blade, and an automatic ink supply system. The doctor blade transfers the printing ink from the circular screen plate to the surface of the substrate supported by the impression cylinder. The entire printing process from paper feeding, ink supply, color registration, UV drying, etc. are fully controlled by the computer. The circular screen printing plate is electroformed, and the mesh holes are hexagonal shaped holes, and the entire mesh surface is even and thin, ensuring the stability and precision of the imprinting. Therefore, roll web screen printing can not only meet the requirements of special effects such as printing frosting and ice flowering, but also can be used for hot stamping holographic anti-counterfeit labels, embossing, and die-cutting molding. It is easy to realize high-speed automatic printing paper boxes. Since the round press and die cutting are line contact, the line pressure during die cutting is much lower than the contact pressure of the flat pressed surface, so the equipment power is small and the stability is good. Due to continuous rolling die cutting, high production efficiency, maximum die cutting speed up to 350 m/min, round press die cutting machine equipped with high-precision register device and die cutting phase adjustment device, can obtain quite high die cutting Accuracy.

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. Special glossy printing processes currently include metal luster printing, pearl printing, pearl luster printing, refractive printing, variable gloss printing, laser holographic iris printing, crystal luster printing, imitation metal etching printing and matte printing. Among them, metal luster printing uses aluminum foil metal composite paper with a more transparent ink to form a special metallic luster effect on the printed product. In pearl printing, the surface of the print is first coated with silver paste, followed by a very transparent ink, and the silver glitter reflects a pearlescent effect through the ink layer. Pearl sheen printing is printed using inks that incorporate mica particles, resulting in a glossy effect similar to that of pearls and shellfish. Refractive printing is the unique effect of using a refraction plate to imprint a picture on a printed article 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 the enamel, so it also has a relatively safe anti-counterfeiting effect.

Security ink printing

Anti-counterfeit ink printing is one of the most important technical branches of anti-counterfeit technology. The features of such anti-counterfeiting technology are simple implementation, low cost, good concealment, bright colors, easy inspection (even hand-temperature changeable colors), and strong reproducibility. It is the preferred anti-counterfeiting technology for banknotes, tickets and trademarks. However, there are many factors that need to be taken into account when using ink technology to reasonably apply to anti-counterfeit packaging and achieve an ideal anti-counterfeiting effect, including selection of printing methods, selection of printing machines, processing of printed materials, use of ink base materials, etc. The level is very demanding.

Multi-color printing

Multi-color serial printing is also called cross-color printing. Generally, multi-color printing is used for letterpress printing. According to the requirements of printing products, ink is placed in ink tanks, and then inks of various hue are placed in different compartments. 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. When this process is used on large-area shading printing, its anti-counterfeiting effect is more prominent.

Magnetic die-cutting drum technology

Traditional round bale round die-cutting uses a one-piece die cutter. When the die cut size or pattern of the job is changed, the printer needs to re-customize the entire die drum.

The factory not only has to invest a lot of money to buy all kinds of knife rollers, but also has a lot of space and manpower resources for knife roll storage. With the new magnetic die-cutting drum technology, the above situation is avoided. Magnetic die-cutting drum technology, the bottom roll is a magnetic steel roll, can be reused, die-cutting steel knife skin is very easy to install, can be adsorbed on the magnetic bottom roller like adhesive tape. If the die-cut repeat lengths of the two batches of jobs are the same, only the die-cutting blade can be replaced when the job is changed. Instead of replacing the die-cutting roller, the die-cutting blade is much cheaper than the die-cutting drum. Technology, companies can save considerable costs.

The development trend of special printing technologies in the post-press processing of packaging products, in addition to various special printing process combinations, also includes improvement of hardware conditions such as machinery and equipment. Overall, current special printing technologies are used in the post-press processing of packaging products. The application has the following characteristics, and these characteristics are also the future development trend.

Multi-technology combination

Flexible printing, gravure printing, and screen printing have different printing application ranges, and each has its own merits in terms of level performance, on-site printing, and the use of ink for special effects. Some packaging and printing companies flexibly combine multiple printing methods and create unique processes based on different products.

The mesh drum plate material is divided into two types: woven mesh and electroplated metal mesh. The mesh roller of the woven mesh is suitable for products with low quality requirements, and the production volume is not particularly large, and can also be used for playing white-backed processes. The metal mesh is welded with a monolithic electroplated nickel mesh, and the ink transfer performance is relatively good. The printing speed is about 50% faster than the braided mesh, but the cost of plate making is relatively high. This method is suitable for products with high quality requirements and large production volumes. The gravure printing has a large amount of ink, and the effect is very good when the printing requires a solid printing such as large field ink, and the printing of metal ink with particles is also stronger than flexo printing and offset printing. In addition, such as flexible application of holographic hot stamping technology, you can do the first hot, after printing, and then hot, using the connection holography (positioning) transfer, with the holographic positioning hot, composed of positioning transfer + positioning printing + positioning hot + positioning and printing technology , greatly improved the security features, the formation of a new anti-counterfeiting process.

Production Online Automation

At present, due to the complexity of the post-printing process of packaging products, especially the use of certain combination processes, such as on-line cutting, online hot stamping, coating, die-cutting indentation, embossing, stripping, on-line compounding, slitting At the same time, the processing steps are more tedious. In order to solve this problem, printing equipment suppliers are also constantly improving. At present, the latest type of equipment has the characteristics of online automated production, which is also one of the development trends of future packaging printing and post-press processing equipment. For example, the flexo/gravure printing machine produced by Dr. Special Company can realize various functions such as inline or independent embossing, indentation, die-cutting and stripping, and can complete printing, die-cutting, indentation and other processes at a time, and the precision of die-cutting is high. Stable machine performance, high efficiency, high quality, high output, low cost