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The application of RFID in the field of printing and printing technology

in the field of packaging and anti-counterfeiting, traditional bar code labels have been widely used. However, with people's higher and more comprehensive information needs for the production, storage and transportation, quality assurance, anti-counterfeiting, management and many other aspects of goods, this bar code label is obviously out of control. It can not only provide information about the production and management of goods, but also warn the temperature and other information required for the quality assurance of goods, In terms of anti-counterfeiting effect, it also gradually loses the anti-counterfeiting effect of commodities because of its single printing and easy imitation. With the progress of science and technology and its application in the field of label making, a new, multifunctional and good anti-counterfeiting smart label has been widely used, which will bring new vitality and vitality to label making and printing

the main features of RFID

RFID (radio frequency identification) - that is, radio frequency identification system, also known as wireless IC tags, electronic tags, inductive electronic chips, inductive cards, contactless cards, etc. it is a technology to achieve contactless data access through radio waves, which can connect the database system behind through wireless communication combined with data access technology, Form a large and connected system. A complete RFID system includes reader, sensor or chip, antenna, software and hardware system, etc. Its basic principle is that when the label enters the magnetic field area, it receives the signal sent by the reader, sends the product information stored in the chip with the energy obtained by the induced current, or actively sends the signal of a certain frequency. After reading and decoding the information, the reader sends it to the central information system for relevant processing

rfid tags can be divided into passive tags: they will not automatically send out information waves, and the reader will send out radio waves to generate signals. The antenna of the RFID tag receives the induced current generated by the magnetic field, and then sends the information stored in the chip to the reader to receive and interpret. Active tag: in addition to the chip and antenna in the tag, the power supply is added, which can continuously actively send data signals to the reader to receive and interpret

to sum up, RFID mainly has the following characteristics:

(1) data reading and writing function: as long as it is through RFID, it can directly read the information into the database without contact, and can process multiple tags at a time, and it can process logistics. Some customers can even unload their hearts and chat with us about their homely status and write tags for reading and judgment in the next stage of logistics processing

(2) shapes that are easy to miniaturize and diversify: RFID is not limited by size and shape in reading, and does not need to match the fixed size and printing quality of paper for reading accuracy. In addition, RFID can be miniaturized and diversified to be applied in different products

(3) environmental resistance: once the paper is dirty, the information on it will not be visible, but RFID has strong anti fouling properties to substances such as water, oil and drugs. RFID can also read data in a dark or dirty environment

(4) reusable: because RFID is electronic data, it can be overwritten repeatedly, so it can be recycled and reused. For example, passive RFID can be used without batteries, and there is no need for maintenance

(5) penetrability: if RFID is covered by non-metallic or non transparent materials such as paper, wood and plastic, it can also carry out penetrable communication. However, if it is iron metal, communication cannot be carried out

(6) large memory capacity of data: the data capacity will expand with the development of memory specifications. In the future, the amount of data that items need to carry will be larger and larger, and the demand for the expansion capacity of volume labels will also increase, for which RFID will not be limited

the main application of RFID in the printing field

in fact, RFID technology has been studied and applied as early as World War II. At that time, Britain used RFID to confirm whether the aircraft entering the airport was its own aircraft, so as to avoid accidental attack. RFID is equivalent to a tag that can read the above information without touching, so it has a wide range of applications, such as access control (personnel access control, control and personnel management on and off duty); Asset collection and waste management (management of recyclable containers such as pallets, containers, trolleys and cage cars; waste recycling and disposal, waste management and control system, etc.); Cargo management and storage material handling (baggage identification of air transportation, inventory, logistics and transportation management; inventory and material control system of warehouse); Medical applications (medical record system of the hospital, management of dangerous or controlled biochemical substances); Transportation (Toll System of Expressway); Anti theft application (anti-theft management of supermarkets, libraries or bookstores); Animal monitoring (animal husbandry management, pet identification, wildlife ecology tracking); Automatic control (assembly and production of automobile, home appliance and electronic industry); Joint tickets (joint multi-purpose smart stored value cards, bonus point cards) and many other aspects

in the printing field, RFID will gradually replace the traditional bar code label. Experts predict that RFID technology will have an important impact on packaging, anti-counterfeiting printing and paper in the next few years. For the printing field, in the RFID production, the printing technology can be used to produce RFID antenna, which brings new development opportunities to the printing industry

rfid has been applied more and more in logistics and management. In foreign countries, Wal Mart, the largest retailer in the United States, began to require major upstream suppliers to add RFID to their warehouses in January 2005. RFID was fully used by the end of 2006

RFID printing technology

RFID production is very different from traditional label printing. At present, China's traditional label printing technology has reached a high level. There are many experienced enterprises in the trademark printing industry, which also produce many products with exquisite design and high quality. However, for RFID, some people think that it has nothing special, as long as it is covered with a beautiful coat with an ordinary label, This is not difficult for the printing enterprises of high-quality labels, but simply adding RFID with a beautiful coat will cause important losses for its high added value. Then, compared with traditional label printing, what are the characteristics of RFID printing? First of all, from the definition of RFID, intelligence refers to the RF circuit composed of chips, antennas, etc; The label printing process makes the RF circuit have the appearance of commercialization. From the perspective of printing, the emergence of RFID will bring higher gold content to traditional label printing. The chip layer of RFID can be encapsulated and printed with paper, PE, automobile parts, pet and even textiles at every position, and made into self-adhesive stickers, paper cards, tags or other types of labels. The chip is the key of RFID, which is determined by its special structure and cannot bear the pressure of the printing machine. Therefore, in addition to inkjet printing, the process of printing the surface layer first, and then compounding and die cutting with the chip layer is generally adopted

(1) printing method. Silk printing is the first choice for printing, which is mainly because the printing quality of silk printing in integrated circuit boards, membrane switches and other aspects is unmatched by other printing methods. In RFID printing, our team should constantly summarize the conductive ink in recent years, and the wire with better conductive ink is nickel foil perforation. It is a kind of high-tech wire. It is not a wire woven from ordinary metal or nylon threads, but a foil made of nickel foil by drilling holes. The holes are hexagonal, and round holes can also be formed by electrolytic forming. The whole surface is flat and thin, which can greatly improve the stability and precision of imprinting. It can be used to print high-tech products such as conductive inks, chips and integrated circuits. It can distinguish circuit line spacing of 0.1mm, and the positioning accuracy can reach 0.01mm

(2) application of conductive ink. Conductive ink is a kind of special ink. It can add conductive carriers to UV ink, flexo water-based ink or special offset ink to make the ink conductive. Conductive ink is mainly composed of conductive fillers (including metal powder, metal oxide, non-metallic and other composite powders), bonding agents (mainly synthetic resin, photosensitive resin, low melting point plexiglass, etc.), additives (mainly dispersants, regulators, thickeners, plasticizers, lubricants, inhibitors, etc.), solvents (mainly aromatics, alcohols, ketones, esters, alcohol ethers, etc.). Conductive ink is a functional ink, In printing, there are mainly conductive inks such as carbon paste and silver paste. Carbon paste ink is a liquid thermosetting ink, which can protect copper foil and conduct current after film forming and curing, and has good conductivity and low impedance; It is not easy to oxidize, has stable performance, and is resistant to acid, alkali and chemical solvents; It has the characteristics of strong wear resistance, good wear resistance and thermal shock resistance. Silver ink is a liquid ink composed of ultra-fine silver powder and thermoplastic resin. It can be used on pet, Pt and PVC sheets. It has strong adhesion and covering power, low temperature curing, controllable conductivity and low resistance. In addition, the conductive ink made by adding nano carbon ink with such difference, which is not only reflected in the conductivity of products and technology, to the ink, can also be made from metal powder (such as silver powder) in the conductive ink into nano silver powder to make the conductive ink. This conductive ink not only prints thin, uniform and smooth film, excellent performance, but also saves a lot of materials

in RFID printing, conductive ink is mainly used to print RFID wires, replacing the traditional metal antenna made by foil pressing method or corrosion method. It has two main advantages. First, the metal antenna made by the traditional foil pressing method or corrosion method has complex process and long production time of the finished product. The application of conductive ink to print the antenna is a high-speed printing method, which is efficient and fast. It is the first choice in printing antennas and circuits, which is both fast and cheap. Nowadays, conductive ink has begun to replace etched antennas in various frequency bands, such as ultra-high frequency band (860MHz ~ 950mhz) and microwave band (2450MHz). Antennas printed with conductive ink can be compared with traditional etched copper antennas. In addition, conductive ink is also used to print sensors and circuits in RFID. Secondly, the metal antenna made by traditional foil pressing method or corrosion method consumes and wastes metal materials, and the cost of raw materials of conductive ink is lower than that of traditional metal antenna, which is of great significance to reduce the production cost of RFID

(3) unique process requirements. In RFID printing, there are unique requirements for the production process, which should mainly pay attention to high yield, thick paper printing and composite processing

in terms of high yield, the value of RFID itself is many times higher than that of ordinary printed labels, so while bringing high profits to enterprises, high yield of printed matter is particularly important. In particular, many products require multi-color UV ink printing, polishing and gluing. Most labels with large printing volume are also processed by roll to roll printing or no interface printing (through flower). Due to many processing procedures, it is also difficult to screen the finished products

for thick paper printing, in the process of paperboard processing, it must be noted that the equipment must have good printability for 350g thick paperboard. During paperboard printing, the tension of the paper tape should be kept stable to ensure that the cumulative overprint error of printing is minimized. Therefore, if every picture is overprinted accurately, but the picture