Application of laser holographic anti-counterfeiting technology in the field of cigarette packets
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The laser holographic anti-counterfeiting technology can be pre-molded on the PET film or transferred onto the holographic transfer paper (or made of hot stamped aluminum). Compared with other anti-counterfeiting technologies, it has a unique personalized anti-counterfeiting function. By combining with various printing processes, the laser image has a more layered and three-dimensional sense, which enriches the realism of printed matter and increases the artistic sense of printed matter. As we all know, although the cigarette pack is a "square inch", it can reflect the most cutting-edge, most advanced printing and finishing process. The application of laser holographic anti-counterfeiting technology on cigarette packets has achieved remarkable results in anti-counterfeiting of cigarette packets.
Laser hologram production
At present, hologram production is mostly done by computer lithography, and its image is intelligently produced by computer, and the highest resolution is up to 12000 dpi. This technology can not only design and produce 2D planar images, but also design 2D/3D layered images and 3D true color images, and design dynamic light maps.
Production of metal holographic master and molded version
1. Production of metal holographic master
From a microscopic point of view, the laser hologram consists of interference fringes, and the change in color is the result of light diffraction. After surface treatment of the laser hologram obtained by the laboratory, a silver laser hologram, that is, a metal holographic master, can be obtained by a silver mirror reaction and then subjected to thickness electroless plating, which provides conditions for large-scale production.
2. Production of metal molded version
The metal stamping plate is made by the principle of electroplating. On the metal holographic master, a dense metal material (usually nickel) is plated by chemical plating to form a tight coupling with the original plate, which is durable and has good performance. Metal molded version.
Industrial production of laser holograms
1. Molded copy
Mounting the metal stamping plate on the stamping machine, heating to a suitable temperature, transferring the hologram on the metal stamping plate to the resin-coated film by imprinting (flat or round pressing), or directly imprinting on On the thermoplastic material, after cooling setting and separation, an industrially produced laser holographic molded image is obtained.
2. Vacuum coating
A layer of 30-40 nm aluminum or zinc sulfide is vacuum-deposited on the molded film in order to cure the stripes. The former also has the effect of improving the hologram reflectivity and the image color effect, and is convenient for viewing under white light. Zinc sulphide plating is used to make the film more transmissive.
Application of blanching laser holographic positioning foil on cigarette packets
On the hot stamping device with the positioning cursor, the positioning cursor on the holographic anti-counterfeit hot stamping foil is identified by the electric eye (camera) on the device. When the electric eye senses the positioning cursor, the holographic anti-counterfeit hot stamping foil is applied to a specific part. The hologram is accurately transferred to a specified position of the package by a certain temperature and pressure, thereby functioning as an anti-counterfeiting and decoration.
The positioning of the printed matter is hot stamping, and the requirements for the hot stamping foil are relatively high (such as the spacing of the continuous pattern of the hot stamping foil itself and the spacing of the adjacent patterns between the gauges), and the requirements for the accuracy and stability of the hot stamping equipment are also high. In the printing process, the adhesive of the hot stamping foil is required to have a good bonding force with the surface of the printed matter, and under the action of a certain temperature and pressure, the information of the high resolution laser hologram of the imaging layer can be completely transferred. No loss, to ensure that the hologram after hot stamping still has high diffraction efficiency.
Because of the high content of this anti-counterfeiting technology, the exquisite design, and the personality charm of the brand logo, it is one of the important means in the anti-counterfeiting application of cigarette packets. Almost all medium and high-end cigarette packets are currently used in this process.
Application of cold-hot laser holographic foil on cigarette packets
The manufacturing principle and material structure of the cold-hot laser holographic foil are basically the same as those of the blanching laser holographic positioning foil. The biggest difference between the two is that blanching uses temperature and pressure to transfer the hologram, while cold blanching is done by glue and minimum pressure. The specific working principle is as follows.
First, the glue is applied to the substrate where the hologram needs to be transferred, and the hologram is transferred to the substrate by the pressure between the blanket cylinder and the impression cylinder, and the hologram is cured on the surface of the substrate by ultraviolet light. . Since the temperature is not used and the minimum transfer pressure is used, even fine lines and small characters can be completely transferred, making the entire picture more vivid. Many cigarette packs are currently using this process.
However, due to the fact that the cold-hot holographic foil has not completely solved the jumping problem, and the selection of the glue is not broad and the production process of the cold-hot holographic foil itself needs to be optimized, there is still a large space for the quality improvement and cost reduction of the cold-hot. However, with the further improvement of materials and technology, the process of cold-hot holographic foil on the cigarette pack will be more common and exciting, thus providing new anti-counterfeiting value for the cigarette pack.
Holographic transfer paper
The holographic foil continuously arranged in the image is uniformly coated on the foil by a coating unit and composited with the paper, dried to form a holographic paper, and then printed on the holographic paper. In order to meet the requirements of environmental protection, the holographic composite paper has been changed to holographic transfer paper. The latter has a laser holographic effect but no PET film. It is more environmentally friendly and can meet the packaging printing quality requirements. It is widely used in the cigarette printing industry. very popular.
According to the holographic effect, the type of media and the randomness of the pattern, the holographic transfer paper can be divided into a light column, a plain surface, a high refractive brightness, a transparent zinc sulfide, a positioning pattern holographic transfer paper, and the application on the cigarette packet can reflect different anti-counterfeiting effects. However, since the surface of the holographic transfer paper is a non-absorbent surface, quality problems such as smudging, sticking, and explosion are likely to occur during printing, so UV printing is basically used.
The combination of holographic technology and printing technology combines the color effect of ink and the flexibility of printing with the powerful visual appeal of holograms, which can achieve very peculiar effects, which is unmatched by a single hologram. There are three ways to combine printing and hologram on paper: the first is to print on the hologram hologram, the hologram and the printed image do not need to be aligned, the production is the least difficult; the second is the printed graphic and holographic The picture has a certain spatial relationship. The printed image is compensated on the hologram or around the hologram. The requirements for the set are not high and the production is slightly more difficult. The third is that the printed graphic and the hologram need to be strictly aligned. The process and papermaking process are the most difficult, but they can provide the maximum anti-counterfeiting effect and design creative space for cigarette packets.
Laser holographic anti-counterfeiting technology has become a bright spot in modern packaging printing technology with its advantages of novelty, eye-catching and anti-counterfeiting. However, China's huge cigarette package market has also promoted the development of laser holographic anti-counterfeiting technology and the innovation of laser holographic materials. It is believed that through the complementarity of the two, it will promote each other and further promote the re-upgrade of laser holographic anti-counterfeiting technology and cigarette packet anti-counterfeiting technology.