Characteristics and technology of holographic positioning hot stamping

Electrochemical aluminum foil printing (also called bronzing), because of its unique advantages, is more and more widely used in packaging and decoration printing. Ordinary anodized aluminum foil printing is hot and cold, but they generally only play the role of decoration and decoration of the printed matter, so that the product has a brilliant effect and icing on the cake. In recent years, with the development of high-tech and anti-counterfeiting technology, a new technology mainly used for printing securities and commodity packaging-holographic positioning hot stamping technology has attracted more and more attention, it not only provides commodity packaging Decoration, and has a good anti-counterfeiting effect, because holographic positioning hot stamping is a high-tech, it involves holographic hot stamping foil materials, hot stamping machinery and positioning devices, etc., so we must fully understand and master the characteristics of these materials and equipment To work better. Let's talk about the characteristics and application technology of holographic positioning hot stamping.

Features and principles of holographic hot stamping

Holographic hot stamping technology is a new technology with short application time. It combines the anti-counterfeiting technology of laser holographic image with good anti-counterfeiting effect and hot stamping decoration technology, so that the product can increase the anti-counterfeiting performance while improving the decoration. The laser hologram is made according to the principle of laser interference and using spatial frequency coding. Laser holograms have been used in the field of anti-counterfeiting in the 1980s due to their vivid colors, obvious layers, vivid images, changeable optical transformation effects, and high information and technical content. The latest OVD technology has been clearly distinguished from the widely used HOLOGRAM holograms, and some holograms already have machine identification functions. The mechanism of holographic hot stamping is that the hot melt adhesive layer and the separation layer on the holographic hot stamping material are heated and melted by the hot stamping die on the hot stamping equipment, and under a certain pressure, the information layer of the hot stamping material is holographic grating The stripe is separated from the PET base material, so that the aluminum foil information layer is bonded to the ironing surface and melted into one body to achieve a perfect combination.

The main technical methods of holographic positioning hot stamping

At present, there are three main types of holographic hot stamping, namely ordinary version hologram without positioning hot stamping, special edition hologram without positioning hot stamping, special edition hologram positioning hot stamping. Among these three types, the anti-counterfeiting effect of ordinary version hologram non-positioning hot stamping and special version hologram non-positioning hot stamping is still not ideal, so it is only used for product packaging that does not require high anti-counterfeiting requirements. The hologram positioning hot stamping has a good anti-counterfeiting effect, so in recent years it has been widely used in the packaging and printing of banknotes and marketable securities, high-end cigarettes, wine and valuable commodities. The special version of hologram positioning hot stamping means that the hologram of a specific part of the holographic anti-counterfeiting hot stamping anodized aluminum is accurately stamped on the specific position of the cigarette pack through photoelectric identification on the hot stamping equipment. The hologram positioning hot stamping technology is very difficult. Not only the printing plant is required to be equipped with high-performance, high-precision special positioning hot stamping equipment, but also high-quality special positioning hot stamping anodized aluminum. The production process must also be strictly controlled to produce qualified cigarette pack products. Because the positioning hot stamping logo has high anti-counterfeiting performance, it is used in banknotes and important documents.

In the holographic positioning hot stamping technology, the positioning technology is mainly to eliminate the gradual accumulation of the hot stamping accuracy error during the hot stamping process. The independent pattern holographic hot stamping foil needs to use the positioning cursor to correct the error of the holographic pattern in time. The holographic pattern on each hot stamping foil needs to have a matching square cursor. The center line of the holographic pattern and its cursor are consistent, and the distance is kept at a constant relative position of at least 3 mm. To ensure the accuracy of the cursor, the edge of the cursor should be very straight, and the optical characteristics should be sharp and consistent.

At present, there are three types of technologies used for positioning systems: basic, co-located with hot stamping, and intelligent.

(1) Basic positioning system. It is the simplest kind of positioning hot stamping technology. The detector is at a certain distance from the hot stamping plate, and the pattern recognized is not the pattern being hot stamped. Therefore, this positioning technology must require that the spacing between all holograms be exactly the same, otherwise, any errors will be reflected as errors in positioning hot stamping.
(2) Co-located positioning technology with hot stamping plate. This positioning technology has a detector close to the hot stamping plate, and the positioning pattern is consistent with the hot stamping pattern. It is the most accurate positioning technique, and is especially suitable for small flat pressing hot stamping machines.
(3) Intelligent positioning technology. The position of the detector of the intelligent positioning technology is a certain distance away from the hot stamping plate, but it uses a microprocessor to control to keep track of the distance between the cursors, and pull the hot stamping foil to change the position of the pattern, which improves the positioning. accuracy. This positioning method is more sensitive to the tension control of hot stamping foil.

In order to stamp multiple independent holographic patterns on the substrate at one time, the arrangement of the holographic patterns needs to be calculated in advance. Assuming that there are 5 patterns that need to be stamped at a time, and there are only 2 patterns between each pair of adjacent printing plates, the general sequence of pulling the hot stamping foil is: walking through 1 pattern-hot stamping; walking 1 pattern-hot stamping ; Walked through 13 patterns-hot stamping. However, when skipping the size in this hot stamping sequence, the tension of the foil film base will be greatly different, resulting in positioning errors. Therefore, the arrangement of the holographic patterns should be calculated reasonably, so that each pattern can be walked through 5 patterns to avoid errors caused by size jumps.

In holographic alignment hot stamping, more advanced dual-alignment cipher holographic hot stamping technology has been successfully developed. This high-tech technology adds holographic anti-counterfeiting effect. Double-alignment password holographic hot stamping is to directly imprint the image containing the password after special processing on the designated position of the substrate, so that the password hologram and the packaging are directly integrated, and will not separate. Dual-position cipher holographic hot stamping technology is difficult and requires high technology. Special equipment is required. Different holographic hot stamping films and hot stamping adhesives should be produced according to different properties of hot stamping substrates. , Non-general anti-counterfeit product manufacturers can produce. Due to the particularity and complexity of its technology, it has become another ideal anti-counterfeiting method. This new technology can be widely used in credit cards, discount cards, marketable securities, various packaging color boxes, cigarette cases, clothing tags and product sheets, which can greatly enhance the anti-counterfeiting performance and have a good anti-counterfeiting effect.

The main materials and equipment of holographic positioning hot stamping

(1) Holographic hot stamping foil. Holographic hot stamping foil is a holographic laser treatment of film foil with hot stamping function. Its 2D, 3D, 2D / 3D, dot matrix, spiral, synthetic hologram, etc. have high gloss, colorful and variable. Color two-dimensional, three-dimensional hologram, linear geometric hologram, dichroic shadow effect hologram, linear outline hologram, dual-channel effect hologram, rotating hologram and other images, surface finishing of printed matter or paper. Compared with ordinary anodized aluminum hot stamping foil, the thickness of holographic hot stamping foil can just meet the basic requirements of hot stamping, and the structure is also different from ordinary anodized aluminum hot stamping foil. Anodized aluminum hot stamping foil is mainly composed of two thin layers, namely a vinegar film substrate and a transfer layer. Its basic structure is base film layer, alcohol soluble dyeing resin layer, aluminized layer, adhesive layer, and its dyeing layer is pigment. When printing, it relies on high temperature and pressure to hot stamp the golden anodized aluminum foil on the substrate, also known as hot stamping. The holographic hot stamping foil dye layer is a grating. It is not the pigment that displays the color or image, but the holographic pattern formed by tiny pits (gratings) on the surface of the transfer layer after the laser beam acts. Its generation is quite complicated. During hot stamping, the peeling layer oxidizes and the adhesive layer melts within a few milliseconds when the hot stamping plate contacts the holographic hot stamping foil. By applying pressure, the transfer layer is bonded to the substrate, while the foil base film and the transfer layer are separated, the hologram on the holographic hot stamping foil is transferred to the substrate in the shape of a hot stamping plate.

In addition, holographic hot stamping foils include common holographic hot stamping foils and transparent holographic hot stamping foils. Among them, the transparent hot stamping foils obtained a national utility model patent in 2000 and have a new generation of hot stamping foils with strong anti-counterfeiting functions. Compared with ordinary hot stamping foils, transparent holographic hot stamping foils use advanced magnetron sputtering technology and replace the aluminum layer in conventional aluminum plating technology with a high refractive index medium. Its biggest feature is that it can not affect the original Under the condition of the overall effect of the information carried by the printed matter (such as text and patterns), the laser hologram pattern (ie, transparent hologram) is superimposed, that is, the original information on the object to be hot can be seen through the hologram.

In the holographic hot stamping foil, different holographic effects can be combined with each other. At the same time, multiple anti-counterfeiting elements such as dual channels, partial aluminum plating, color separation effects, micro lettering, hidden information, etc. can be added. In the process of surface finishing, its unique copyright protection is achieved by effective high-level anti-counterfeiting measures. The technical processing of the holographic hot stamping foil surface can be either an independent pattern for positioning or a continuous pattern that can be positioned without free space. The scope of application has been expanded from the anti-counterfeiting of early government documents and banknotes to more valuable High-volume, large-volume products, such as cigarettes, alcohol, pharmaceuticals, cosmetics, fashion, clocks, computer software, and other packaging, and special surface decoration after label printing, have become an important part of the image.

(2) Main hot stamping equipment. Depending on the holographic hot stamping foil hot stamping method, different hot stamping equipment can be used. For example, in the hot stamping of continuous holographic logo hot stamping foil, the holographic logos are regularly arranged on the electrochemical aluminum foil. Each time when stamping, several characters or patterns are stamped as a whole onto the surface of the final product. Generally, there is no specific requirement on the accuracy of the stamping position, that is, there is no special requirement on the choice of stamping equipment, so it can be The flat pressing type hot stamping machine, the round flat pressing type hot stamping machine, the round pressing round type hot stamping machine, the operation technology is relatively simple and easy. The hot stamping of the hot stamping foil with the independent pattern holographic logo must be directed to each individual trademark pattern, and there is an alignment mark next to each pattern. This imposes high requirements on the function and accuracy of the hot stamping equipment. It requires both the hot stamping equipment with a positioning recognition system, and the positioning hot stamping accuracy error is less than ± 0.5 mm. The performance, such as hot stamping small marks on a single cigarette box and large marks on the entire cigarette box, the machine must have fine-tunable temperature, pressure, speed control devices and sensitive reactivity. In addition, it requires relatively high operating technology.

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