The most popular packaging information anti-counte

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Packaging information anti-counterfeiting printing technology (I)

since China's reform and opening up, the economy has developed rapidly and commodities are abundant. Enterprises engaged in the production of various products have strived to create brands and prospered the commodity market. But all kinds of fake and shoddy commodities also flooded the market at an alarming rate, causing very serious economic losses. Therefore, the anti-counterfeiting technology to prevent products from being forged and counterfeited has been produced. Printing anti-counterfeiting is one of the main anti-counterfeiting technologies of packaging. This paper briefly discusses the technology of printing anti-counterfeiting with information

1. Anti counterfeiting technology of human information bar code

since the end of the 1990s, IBM began to study concentric circle (so-called ox eye) code identification. Since it was used in commodities, bar code technology has been continuously improved. Consumers have put forward higher requirements for automotive products: energy saving, beauty, safety, environmental protection and so on. At present, there are visible bar codes for commodity identification. It is a bar code printed with colorless anti-counterfeiting ink that is invisible to the naked eye under visible light illumination but can display fluorescent bar

code under ultraviolet and infrared radiation. It adopts digital symbols or mixed coded characters. It has the characteristics of high density, high capacity, reliable decoding, strong error correction ability and good confidentiality. It can not only store natural information such as personal photos and address, but also store signs for personal identification, such as photos, blood types, fingerprints, visual vascular maps and other secondary bar codes (two djmensjnal bar codes). And the paper hidden bar code which is more difficult to copy than the general two-dimensional bar code and is integrated with the paper after special photochemical treatment. It cannot be peeled off and can only be used once. It cannot be recognized by human eyes, nor can it be photographed with visible light or copied. During identification, only a scanner with a certain wavelength can be used to read the information in the bar code. It has high strength, toughness and mechanical properties, and is not easy to deform. It can be used in outdoor harsh environment for a long time. It is resistant to wind, rain, high and low temperature, acid and alkali corrosion. It is suitable for famous and high-quality products such as machinery and electronics. It is a metal bar code that can be read from a long distance by laser and is compatible with the general code system without electromagnetic interference

the comprehensive anti-counterfeiting bar code of human body information after adding the anti-counterfeiting information of human body characteristics to the two-dimensional bar code with information anti-counterfeiting function is an anti-counterfeiting method with stronger anti-counterfeiting function although China's mechanical products have a certain international comparative advantage. Human body information that can be used to prevent counterfeiting includes:

(1) fingerprint information. Fingerprints are the patterns formed by the protuberance of the mastoid line of the palm skin at the end of human fingers. They are the most important type of fingerprints. The patterns formed on the hands and feet are called palmprints

fingerprints can be divided into hundreds of patterns. Each fingerprint is arranged and combined into nearly 100 feature points by 13 points and lines of different shapes. In addition, the location and distribution of each feature point and line are different, which makes the detection transmission of fingerprint specificity, stability, residual metal fatigue and so on reach the so-called "unchanged for life, different for ten thousand people". It was reported in France that the detailed features of fingerprints were summarized into four types by mathematical methods, and each fingerprint had about 100 details. After arrangement and combination, the number of out door digits was obtained. Then, based on the population of about 5billion in a century, there were 10 fingers per person, that is, 50billion fingers. Through calculation, it is found that it will take 50 digit centuries for humans to have absolutely repeated fingerprints, so in fact, there can be no two people in the world with identical fingerprints. Therefore, fingerprints are recognized as an absolutely reliable sign of personal identification, and have been used in forensic science for a long time. In ancient China, fingerprints have always been used to prove personal identity and have been highly praised by countries all over the world. It can be seen that fingerprints are universally recognized as personal marks that can not be imitated. As a special mark, fingerprint can be made into a pattern. The password can be printed into a magnetic bar code with magnetic code anti-counterfeiting ink. The purpose of anti-counterfeiting can be achieved by the identification of the automatic fingerprint identification system when the packaging passes through the channel to prevent the export

(2) Palmprint and hand shape anti-counterfeiting. The formation and specificity of palmprint are the same as those of fingerprint. Only when used, because the palmprint is very large, it can be used as the same identification after overall separation. Some people use it as the anti-counterfeiting of bulk commodities to prevent some of the goods in boxes from being "transferred" and some fakes from being genuine

palm print can also be used in the security system of the passageway

the controller adopts the embedded single-chip microcomputer structure. The palm shape can be measured according to the anthropological method to find out the differences between each person, but its accuracy is far less than that of finger and palm print. But it can also be regarded as a method of distinguishing false

(3) DNA anti-counterfeiting. DNA (deoxyribonucleic acid) exists in all nuclear animals and plants, and all genetic information of organisms is stored in DNA molecules. The coding region in the DNA structure, that is, the genetic gene or gene sequence, accounts for 1/10-1/30 of the total length of DNA. This part is the so-called genetic code region

as far as human beings are concerned, there are about 100000 genetic genes, each of which is composed of four nucleotides, a, t, G and C, arranged in order on two complementary spiral DNA long chains. The total number of nucleotides is about 3billion. If we randomly check the DNA maps of two people, the probability that they are identical is only one in 300billion. This probability is far lower than the reciprocal of the world population before the dry day. Therefore, the value of identifying individuals can be regarded as 100%. Just like human beings, any organism, whether animal or plant, as long as it is a eukaryote, has DNA in its nucleus, and the fragments of this DNA are polymorphic, which is a natural genetic code mark. Especially in higher animals and plants, the number of genes is extremely large, which exceeds the alkaline gene comparison (). If it is used for anti-counterfeiting, only a few hundred BP is enough. It can be seen that DNA is used as a password, and there is a very wide range of choices, which can be said to be inexhaustible. In recent years, there have been reports of using DNA as password anti-counterfeiting at home and abroad, and DNA encryption ink has been introduced for signature

the Institute of biological DNA anti-counterfeiting technology of Shandong Normal University has passed the expert identification. They constructed a new plasmid vector, achieved mass production of DNA molecules through DNA cloning technology, and established a detection method using PCR (polymerase chain reaction). Because DNA molecule is non-toxic and very stable, it can be dissolved in water and some polar solvents. It can be added to commodities or their packages as a medium to prevent counterfeiting. The biology research group of Shandong Normal University has mixed the plant DNA code with printing oil, glue, cosmetics and low alcohol Baijiu to study the feasibility of anti-counterfeiting for commercial use. Since PCR detection requires special equipment, the DNA code is still an expert anti-counterfeiting method at present. In the lawsuit of the authenticity of batch products, reliable scientific evidence can be obtained through expert identification, which plays a great role

the gold anti-counterfeiting technology research institute of Nankai University is studying the grafting of ona gene double helix on photochemical recognition materials. The Institute has expanded a variety of base countries, gradually established a database, and has synthesized a variety of photochemical materials, such as fluorescence, photochromism, photomagnetism, photoacoustics, etc. The bar code printed by these materials can simplify the existing detection methods, and the existence of DNA code of the sequence can be determined by observing whether there are fluorescence or color indicators, so as to identify the authenticity

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