The application of the hottest RFID in the printin

2022-08-07
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The application of RFID in the printing field and its printing technology

in the field of packaging and anti-counterfeiting, the traditional bar code label has been widely used. However, with people's higher and more comprehensive information demand for the production, storage and transportation, quality assurance, anti-counterfeiting, management and many other aspects of commodities, this bar code label is obviously out of control. It can not provide information about commodity production and management, It can not warn the temperature and other information required for the quality assurance of commodities. In terms of anti-counterfeiting effect, it also gradually loses the anti-counterfeiting effect of commodities due to 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. It will bring new vitality and vigor to label making and printing

rfid (radio frequency identification) is a radio frequency identification system, also known as wireless IC tag, electronic tag, inductive electronic chip, inductive card, contactless card, 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, Form a large and interconnected 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 do not automatically send out information waves, but the reader sends 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 for reception and interpretation. Active tag: in addition to the chip and antenna, the tag adds a power supply, which can continuously actively send data signals to the reader for receiving and interpretation

to sum up, RFID mainly has the following features:

(1) data reading and writing function: as long as RFID is used, it can directly read the information into the database without contact, process multiple tags at a time, and write the status of logistics processing into the tag for reading and judgment of logistics processing in the next stage

(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, it will not be able to see the information on it, but RFID has strong antifouling properties for substances such as water, oil and drugs. RFID can also read data in a dark or dirty environment

(4) reusable: as 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 penetrability communication. But if it's iron, it can't communicate

(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 become larger and larger, and the demand for the expansion capacity of volume labels will also increase. Therefore, RFID will not be limited

rfid's main application in the printing field

in fact, RFID technology has been studied and applied since the Second World War. At that time, Britain used RFID to confirm whether the aircraft entering the airport were its own aircraft, so as to avoid accidental attack. RFID is a tag that can read the above information without touching, so it has a wide range of applications. For example, access control (personnel access control, control and personnel management on and off duty); Asset surcharge and waste management (management of recyclable containers such as pallets, containers, trolleys and cage cars; waste recycling and treatment, waste management and control system, etc.); Cargo management and storage material handling (baggage identification in air transport, inventory and material measurement system will be cleared automatically; flow transport management; inventory and material control system in warehouse); Medical application (medical record system of the hospital, management of hazardous or controlled biochemical substances); Transportation (Toll Collection System of Expressway); Anti theft application (anti-theft management of supermarkets, libraries or bookstores); Animal monitoring (animal husbandry management, pet identification, tracking of wildlife ecology); Automatic control (assembly and production of automobile, home appliance and electronic industries); Joint tickets (combined with 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 supply warehouses in january2005. RFID was fully used by the end of 2006

There is a great difference between RFID production and 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 high-quality label printing enterprises, but simply adding a beautiful coat of RFID will cause important losses for its high added value. Then, compared with traditional label printing, what are the characteristics of RFID printing? Firstly, 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 24. power supply: 750W, 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 labels or other types of labels. The chip is the key of RFID, which is determined by its special structure and can not bear the pressure of the printing machine. Therefore, in addition to inkjet printing, it is generally used to print the surface layer first, and then help with the chip stepless, automatic Double clutch and other variable speed systems (cvt/at/dct) reduce the weight of the layer composite and die-cutting process

(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 cannot be matched 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 can also be formed into round holes by electrolytic forming. The whole surface is flat, even and thin, which can greatly improve the stability and precision of imprinting. It can be used to print high-tech products such as conductive ink, chip and integrated circuit. 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-metal 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 aromatic hydrocarbons, 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 paste 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 conductivity 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 has a thin, uniform and smooth printed film, excellent performance, but also can save a lot of materials

in RFID printing, conductive ink is mainly used to print RFID wires, replacing the metal antenna made by traditional 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. However, 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 the printing antenna and circuit, 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 for 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 the RFID printing process, there are unique requirements for the production process. The main attention should be paid 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. Therefore, 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 each picture is overprinted accurately, but the spacing between pictures has a large error, it will also be

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