The application and printing technology of the hot

The application of RFID in 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 required for the quality assurance of goods, In terms of anti-counterfeiting effect, it 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, multi-functional and good anti-counterfeiting smart label has been widely used, which will bring new vitality and vitality to label printing. The main characteristics of RFID

RFID 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. It can connect the database system behind it through wireless communication and data access technology, forming a huge and connected system. A complete RFID system includes a reader, sensor or chip, antenna, software and hardware system, etc. its basic principle is that when the label enters the magnetic field area, the received reader sends a signal, sends the product information stored in the chip with the energy obtained by the induced current, or actively sends a 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 data waves, and the reader will send 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, the tag has increased the power supply, which can actively send data signals after a maintenance period of 2 (3) hours to read and store historical data. To sum up, RFID has the following characteristics

data reading and writing function: as long as RFID is used, the information can be directly read into the database without contact, and multiple tags can be processed at one time, and the status of logistics processing can be written into tags for the reading and judgment of logistics processing in the next stage

shapes that are easy to miniaturize and diversify: RFID is not limited by size and shape in reading, and there is no 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 to different products. Environmental resistance: once the paper is dirty, it will not be visible, but RFID has strong resistance to water, oil, drugs and other substances. RFID can also read data in a dark or dirty environment

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

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

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 this, RFID will not be limited

the main application of RFID in the field of printing

in fact, RFID technology has been studied and applied as early as the Second World War. At that time, Britain used RFID to confirm whether the aircraft entering the airport was its own aircraft, so as to avoid being hit by a strain gauge pasted on the surface of the elastic element. 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 field of printing, RFID has gradually replaced the traditional bar code label. Experts predict that RFID technology can have an important impact on packaging, anti-counterfeiting printing and paper in the next few years. For the printing field, in RFID production, printing technology can be used to produce rfid antennas, as well as the research and development of printed chip parts, which bring new development opportunities to the printing industry. RFID has been used more and more in logistics and management. Abroad, Wal Mart, the largest retailer in the United States, decided to require the top 100 upstream suppliers to add RFID to the warehouse of supply in January 2005. By the end of 2006, RFID was fully used. In China, such as pet and animal identification chips implanted in animals, youyou cards (smart cards) used by MRT, contactless access cards used by many companies, and so on, We can see the practical application of RFID in life, so we can understand that the demand and application of RFID are growing

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, some people think that RFID is 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 such a simple RFID with a beautiful coat is worrying about its high added value, otherwise it will cause serious losses. Then, compared with traditional label printing, what are the characteristics of RFID printing? First of all, from the definition of RFID, intelligence is a 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, pet and even textiles to make self-adhesive stickers, paper cards, hanging tags or other types of tags. 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, then compounding and die cutting with the chip layer is generally adopted

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 cannot be achieved by other printing methods. In RFID printing, conductive ink should be used, and nickel foil perforation is the wire with better conductive ink. 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

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, wear resistance and good 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 with strong adhesion and hiding power. Low temperature curing, controllable conductivity and very low resistance. In addition, the conductive ink made by adding conductive nano carbon ink to the ink can also be made from metal powder (such as silver powder) in the conductive ink into nano silver powder to make conductive ink. This kind of 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 antenna, 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 (860 ~ 950mhz) and microwave band (2450MHz). Antennas printed with conductive ink can be comparable to traditional etched copper antennas. In addition, conductive ink is also used to print sensors and circuit printing 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

unique process requirements. In RFID printing, there are unique requirements for the production process, and the main attention should be paid to high yield, thick paper printing and composite processing. In terms of high yield, because the value of RFID itself is many times higher than that of ordinary printed labels, it is particularly important to have a high yield of printed products while bringing high profits to enterprises. 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 adaptability to 350g thick paperboard. The printing company has a R & D and design team of more than 10 people. In the process of 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 each picture