Application of nanotechnology in anti-counterfeiti

Application of nanotechnology in packaging anti-counterfeiting

limitations of traditional anti-counterfeiting technology. Looking at the current anti-counterfeiting field, anti-counterfeiting materials and technologies widely used at home and abroad mainly include ink anti-counterfeiting, paper anti-counterfeiting, laser holographic anti-counterfeiting, plate anti-counterfeiting, biological anti-counterfeiting and so on. Generally speaking, it can be divided into two categories: traditional technical anti-counterfeiting and modern intelligent anti-counterfeiting. The intelligent anti-counterfeiting system can be considered as the fourth generation of anti-counterfeiting technology products in China. According to the analysis, in the past 10 years, China has developed three generations of anti-counterfeiting technologies, including trademark anti-counterfeiting, laser anti-counterfeiting and password (code) verification anti-counterfeiting, but these technologies have failed to fundamentally solve the fatal problems such as easy counterfeiting, repeated use of packaging and other troubles. In short, the traditional anti-counterfeiting technology has common weaknesses and limitations. The first is the dependence on equipment, that is, the traditional anti-counterfeiting methods are very dependent on technology, process, equipment and materials. As long as there are corresponding materials and equipment, the same "anti-counterfeiting logo" can be made according to the same or even similar process, which provides a great opportunity for counterfeiters and counterfeiters. The second is the macroscopicity of the observation scale. The information contained in the anti-counterfeiting logo made by the traditional anti-counterfeiting technology (such as a figure, a letter mark, etc.) is generally above the millimeter level, which belongs to the macroscopic category that can be distinguished by the naked eye and does not reach the microscopic scope. Although this is conducive to popular front-line anti-counterfeiting, there are certain limitations to achieve high-tech anti-counterfeiting ability and improve the effect of anti-counterfeiting. There is also the uncertainty of anti-counterfeiting detection. At present, the detection of traditional anti-counterfeiting signs is mainly through the subjective sensory judgment of the detector, which has great personal experience. For example, the appearance of a bright three-dimensional avatar, even with the help of testing instruments, is ultimately determined by the subjective and qualitative judgment of the tester. In addition, for the traditional anti-counterfeiting technology, it only stays in the qualitative identification stage at present, and there is no traditional anti-counterfeiting technology that can be directly identified quantitatively by the detection instrument

in view of the limitations of the current traditional anti-counterfeiting technology, it significantly affects the anti-counterfeiting effect of commodities and securities, especially the security of important products and tickets. How to use cutting-edge science and technology to escort commodities has become an important research content all over the world. For example, at present, various new anti-counterfeiting technologies (fingerprint encryption, genetic code, sound encryption, optical film, etc.) are being studied and developed at home and abroad, but their practical application to commodity anti-counterfeiting needs to be further improved. However, the latest information shows that a high-tech anti-counterfeiting technology - Intelligent anti-counterfeiting and the corresponding high-tech anti-counterfeiting developed by applying nanotechnology has begun to show its extraordinary characteristics, which has attracted widespread attention

characteristics of nanotechnology and nano anti-counterfeiting technology

1. Characteristics of nanotechnology

people are no stranger to nanotechnology now. "Nano" is the translation of English nano meter. Nanotechnology is a high-tech that was born and rose rapidly in the late 1980s. Its basic meaning is to understand and transform nature within the scope of nano size (i.e. 0.1 ~ 100nm), and create new substances through direct operation and arrangement of atomic and molecular motion rules and characteristics. Nowadays, nanotechnology cards include nano physics, nano chemistry, nano materials, nano biology, nano processing, nanomechanics, etc. Nanotechnology is actually a technology that uses single atom and molecular range materials. Nanotechnology can be divided into two or three concepts

(1) molecular nanotechnology. This was proposed by American scientist Dr. Drexler in his book "the machine of creation" in 1986. According to this concept, the machine of combinatorial molecules can be applied, so that all kinds of molecules can be combined arbitrarily, and any kind of molecular structure can be produced. Nanotechnology of this concept has not made significant progress

(2) micromachining technology. This concept positions nanotechnology as the limit of micromachining technology. It is also a technology to artificially form nanoscale structures through nano precision "processing". This nanoscale addition technology also miniaturizes semiconductors and is about to reach its limit. Even if the existing technology continues to develop, theoretically speaking, it will eventually reach the limit, because if the wire width of the circuit is gradually reduced, the insulating film constituting the circuit will become extremely thin, which will destroy the insulation effect. In addition, there are problems such as heating and shaking. In order to solve these problems, researchers are studying new nanotechnology

(3) Biological Nanotechnology. This concept is proposed from the perspective of biology. Originally, organisms have nanoscale structures in cells and biofilms

the broad scope of nanotechnology can include nano material technology and nano processing technology. Among them, nano material technology focuses on material production (ultra-fine powder, coating, etc.) and performance testing technology (chemical composition, microstructure, surface morphology, physical, chemical, electrical, magnetic, thermal and optical properties). Nano machining technology includes precision machining technology (energy beam machining, etc.) and scanning probe technology

2. Characteristics of nano anti-counterfeiting technology

the application of nano technology in the field of anti-counterfeiting is a research achievement in recent years. At present, through the hard work of scientific and technological personnel, nano anti-counterfeiting technology has been successfully developed. This technology fundamentally prevents the possibility of counterfeiting of anti-counterfeiting signs, and has strong practical operability. It has made a major historic breakthrough in the field of anti-counterfeiting. On December 14th, 1999, this technology obtained the US national patent authorization certificate issued by the US Patent Office and was listed as the "3.10" of the most advanced anti-counterfeiting technology in China's national standard. Since its inception, nano anti-counterfeiting technology has been applied in customs and other fields and has achieved great social and economic benefits. In September 2000, the leaders of the State Council personally gave instructions and suggested that relevant departments study the application of this anti-counterfeiting technology in the anti-counterfeiting of currency printing

(1) principle of nano anti-counterfeiting technology

nanotechnology is to explore new phenomena and new characteristics (physical, chemical, biological) of material particles (including atoms and molecules) on the nano scale (0.1 ~ 100nm), control substances on this scale, and manufacture materials, devices and systems with new functions. Nano anti-counterfeiting technology is a technology that uses micro charged particles such as atomic nuclei as carriers in the nano scale range, processes the random information carried by them, and gives them to the identification instrument and anti-counterfeiting logo respectively, so as to check whether the two information match to distinguish the true and false. Specifically, a large number of micro charged particles move at a high speed in the same direction under the action of the accelerator, and use solid media such as mica, glass, and body to intercept their instantaneous random information to form a master. The master is reproduced into a working plate, and the nano information is encrypted on the anti-counterfeiting identification medium through special encryption equipment, and then through the packaging process to protect the processed nano information; During detection, image feature matching is carried out through the detection instrument to distinguish the true from the false. The application system of nano anti-counterfeiting technology consists of: nano master plate (nano master plate is first required to be purchased to adopt nano anti-counterfeiting technology), encryption equipment (the key part of which is the encryption part installed with nano encrypted information working plate), anti-counterfeiting marks (divided into paper, laser holographic marks and other media marks), detection instruments (professional identification instruments, arbitration identification instruments) Management software (computer identification system management software is required for the application of arbitration identification instrument)

the general use methods of nano anti-counterfeiting technology include identification installation methods (including manual pasting, machine pasting, encryption, etc.) and identification methods. The identification methods can be divided into: apparent identification (place the encrypted identification horizontally to the light and eyes for visual observation, and the nano watermark part has a prominent feeling relative to the surface of the medium), professional identification (hold the professional identification instrument to aim its window at the predetermined area of the anti-counterfeiting identification, and the green light on the instrument is the true mark, and the wet red light is the false mark) Arbitration identification (use the arbitration detection instrument to aim its probe at the predetermined area of anti-counterfeiting identification, identify the authenticity according to whether the image features of nano information match, and display it on the screen)

(2) basic characteristics of nano anti-counterfeiting technology

compared with traditional anti-counterfeiting technologies such as ink, paper and laser holography, nano anti-counterfeiting technology has obvious advantages. To sum up, it has the following characteristics and advantages

① uniqueness. That is, the micro charged particle swarm only obeys the statistical law, and human beings cannot control the individual behavior of a large number of micro particles deposited in solid media. Due to the difference of nano information such as energy loss, spin and angular momentum of each micro particle at the moment of deposition, its tracks are very different. People can only record its random state, but cannot change this micro three-dimensional group sculpture. Even if the manufacturer himself uses the same materials, equipment and methods, he cannot copy the same nano master

in addition, the essence of nano anti-counterfeiting technology is that nano information is on the carrier to avoid poisoning, loss and micro transfer of data. It has the same service life as the carrier such as paper or plastic, so the encryption is stable and reliable. However, this conference is rich in content, such as temperature change, light change ink and other anti-counterfeiting technologies have performance changes

② microscopic. That is, the tracks of charged particles belong to the micro field of nano scale. If you want to observe such tiny nano information, you need to magnify it thousands of times with a microscope at least, and it is impossible for the naked eye to recognize it

③ detection accuracy. At present, nano anti-counterfeiting technology is the only technology that can use special instruments to quantitatively detect the predetermined area of anti-counterfeiting signs. It can use professional instruments to quantitatively detect the anti-counterfeiting signs embedded in nano information, which is easy to operate and accurate, and overcomes the randomness of subjective judgment through sensory organs

④ flexible and widely compatible encryption process of nano information can be directly implemented on paper, plastic or printed packaging, and can also be made into anti-counterfeiting marks and pasted on various commodities that need anti-counterfeiting, so the process is flexible. In addition, nano anti-counterfeiting technology can be combined with various anti-counterfeiting technologies to provide anti-counterfeiting marks of commodities, and can also be combined with papermaking process, printing process and plastic process to provide nano anti-counterfeiting basic materials, which has a wide range of compatibility

(to be continued)