——Research on the application of high-end anti-counterfeiting technology in three-piece beverage cans by Baosteel Packaging
In the past decade, the high-speed expansion of the three-piece can market has induced three can companies to invest in a large number of printing and coating production lines. The current market has become increasingly saturated. At the same time, with the increase in cost pressures, in the face of the fact that the cost of three-piece cans is significantly higher than that of two-piece cans, the three-piece cans are also facing unprecedented development pressure. Some big-brand three-piece beverage cans products have been or are being developed. Two-piece cans are transferred. With the continuous subdivision of printed iron products and the individualized development needs of customers seeking new changes, more differentiated technology research and research on anti-counterfeiting technologies for some high-end products are in line with the development needs of three-piece cans. Especially large brand customers suffer huge losses due to counterfeit products. In this context, Baosteel Packaging carried out research on the three new anti-counterfeiting technology directions of “invisible watermark embedding securityâ€, “voice control†and “3D†to increase the added value of three-piece cans.
Stealth watermark embedded anti-counterfeiting technology is a combination of optical and image processing stealth anti-counterfeiting technology. The voice control is to develop special ink materials for UV metal printing, so that the three-piece cans contain the information of the voice password and can verify the authenticity through the inspection instrument. The 3D is an anti-counterfeiting function that uses the CMYK principle of four-color misalignment with different perspectives for superposition imaging. At present, Baosteel Packaging has completed the introduction of invisible watermark embedding, voice control and 3D technology in the three-piece metal can printing, and has already had a laboratory prototype, anti-counterfeiting detection effect is good, can improve the anti-counterfeiting ability of three-piece cans, and protect customer brands. To ensure food safety.
Stealth watermark embedding technology watermark encryption and decryption and embedding extraction research Watermark encryption and decryption technology refers to the study of optical encryption holography technology, for the modulation and encryption of watermark information, and combined with image processing technology, generate encrypted holographic watermark image, research encryption holographic watermark image decryption Technology for watermark decryption during authentication. The study of optical holographic watermark anti-counterfeiting technology will focus on the "optical watermarking" technology, which records the phase information of the hidden information in the image and reads the metal thin plate printing image in real-time with a dedicated optical device and phase mask. "Watermark" to achieve anti-counterfeiting purposes.
Embedding and extracting refers to selecting an embedded color space and an embedded frequency domain according to a screening algorithm, a printing resolution, a detector acquisition resolution, and a human eye's perception of a printed image; adaptively selecting the embedding strength and ensuring the image Visual quality; study the geometric attacks introduced by the captured image, and perform accurate rotation correction; image registration is a very important pre-processing step that must be done before extracting the printed watermark; an effective image registration algorithm is robust to the watermarking algorithm. The improvement of sex and embedding capacity is of great significance; researching a digital watermarking algorithm that can resist printing attacks, and seeking to find the digital features that are invariant after printing, and using these digital features to express watermark information.
Combination of watermark and metal UV printing process Metal UV printing is currently the most advanced printing technology in the printing industry. It uses UV-curable inks for metal thin-film printing. The process route is shown in Figure 1.
The watermarking technique applied to the UV printing process is studied, focusing on the graphic processing and plate making process in the metal packaging process. Metal printing graphic arts and paper printing are quite different, such as: a lot of spot color components, on the graphics edge of the trapping of high processing requirements; In addition, the printed matter after the printing needs to be glazing treatment, required in the watermark pattern embedded at the same time , but also to consider completely invisible, the final detection of non-reflective issues. Therefore, embedded digital watermarking has become the focus of application research in the prepress graphic processing phase.
Proofing and making samples containing “Invisible Watermark Embedding Technology†are shown in Figure 2. At present, color printing irons containing invisible watermarks can read embedded information through specialized computer detection software.
Figure 2 The application of invisible watermark embedding technology in metal packaging
The implementation of voice-activated technology The principle of voice-activated UV ink anti-counterfeiting technology The principle of voice-activated anti-counterfeiting technology is to print high-fidelity printing on a high-precision printing machine through a special effect ink. The printed pattern is processed by a specific instrument (including voice recognition system). Recognition, the indicator light on the recognizer will change from red to green with voice recognition function, which can be recorded according to customer's requirements. Through research, it has been found that the UV ink contains a trace element that interacts with the instrument's voice recognition system to recognize the pattern information printed by the ink. This ink has high technical content, is not easy to copy, has a high anti-counterfeiting function, and is suitable for being widely used in security printing. At present, the anti-counterfeiting technology is mainly applied in the fields of screen, ordinary offset printing, gravure printing, flexo printing, and embossing, and is rarely involved in the printing iron industry.
The feasibility of using voice-activated UV inks on metal packaging products Through investigation, we have found that the patterns of security-controlled UV inks for anti-counterfeit printing are often relatively small, and generally the logos and logos of some products are printed to achieve the effect of anti-counterfeiting. Due to the special nature and limitations of the voice-activated UV ink, the price is relatively high, and it is not suitable for printing in large areas. It has been applied to the paper packaging of high-end products such as tobacco, wine and cosmetics.
From the technical realization point of view, the anti-counterfeit of the voice-activated UV ink is transferred from printing paper to printing iron, but the substrate has changed, and this technology can be implemented through the process of printing iron. From the analysis of the ink composition, the composition of the voice-activated UV ink is very similar to that of the metal-coated iron UV ink. There are certain differences in some additives and additives. Therefore, through research and development improvements, it can be fully applied to metal packaging and printing products. In addition, there are many high-end customers in the metal packaging industry. It is necessary to protect the company’s own brand from infringement, enhance company image, and increase product anti-counterfeiting performance.
Proofing, making samples according to product characteristics, the development of proofing process, on the machine proofing printing. The Yintie voice-activated anti-counterfeiting UV ink was successfully applied to high-end products such as plant protein beverages and functional beverages, and sample cans were produced at the canning factory. Figure 3 is a print iron sound security UV ink proofing sample.
Fig. 3 The red area is the sound control security area. The sample is Baosteel's 245ml cans.
Implementation of 3D image technology Preliminary research on 3D image anti-counterfeiting technology There are several ways to achieve 3D imaging technology. This article discusses the 3D images superimposed by red and blue color separation. The red and blue images simulate the principle of human eyes to determine the left and right viewing angles of objects and superimpose information to generate stereo images. Two or so images are obtained through slight changes in the angle of photography, and then the red and blue color channels of the images are processed through software. Finally, a red-blue image has been misplaced and superimposed. Such an image can provide a three-dimensional visual perception of the image object by wearing the simplest red-blue plastic glasses. At present, television image technology has been applied, and some newspapers and magazines are also in use. This technology can be introduced into metal printing and eventually made into metal packaging cans, which can be used for first-line anti-counterfeiting, and can also increase the interest of products to attract customers.
The process of proofing and making samples is: selecting images, separation of color channels, plate making, and canning. Samples are shown in Figure 4.
Figure 4 Application of 3D image technology on three-piece cans.
Conclusion In recent years, with the promulgation of the "Food Safety Law" and the improvement of citizens' food safety awareness, consumers have paid great attention to food safety, but in many remote areas and tourist attractions, counterfeiting of large brands of food and beverages is more intrusive. The customer's brand and interests, on the other hand, also harm the health of consumers.
Baosteel Packaging has developed invisible watermark embedding technology, voice-activated ink security, and 3D image anti-counterfeiting technology. It not only provides technical conditions for personalized security, meets the security requirements of metal packaging, and enriches the first-line anti-counterfeiting technology in the metal packaging market, but also maintains Customer and consumer interests. High-end anti-counterfeit printing technology provides a new idea for the development of three-piece cans. Under the current widespread use of smart phones, it provides the basis for the promotion of various anti-counterfeiting technologies. Baosteel Packaging will continue to work hard to develop better and more convenient anti-counterfeiting technologies to protect customers' brands and ensure food safety for consumers.
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