The hottest supermarket urgently needs RFID tags

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Large supermarkets urgently need RFID tags

RFID tags (RFID tags) are a technology that uses radio waves to identify objects within a certain frequency range. A single object is identified by a chip installed on the tag. The antenna integrated in the chip can transmit the stored information to the reader

supermarket chains and department stores regard rf1d label technology as the so-called technology within their business scope. Commodity electronic codes are of great interest, because this technology can tell you anytime, anywhere. How many RFID packages are placed on which shelf. It makes it possible to analyze and optimize commodities in circulation in the business process

customers also benefit

customers can also benefit from this innovation of supermarkets. The use of RFID tag technology in large supermarkets can greatly shorten the waiting time of customers in front of the checkout counter. Because when the purchased goods pass through the cashier, the information of all goods is collected like lightning and settled quickly

rf1d tag chip not only provides recognition ability, but also has additional storage unit, so that RFID tag can carry other information. For example, it can let the refrigerator show whether the milk has gone bad: once the heat-resistant fabric is washed at high temperature, the washing machine can issue a warning. Although this kind of washing machine is still an imaginary product at present, it may soon become a reality

low cost mass production

in order to realize the plan of carrying an RFID chip on each package in the supermarket, about 500billion RFID tags need to be produced every year. Today's silicon semiconductors can't meet such a large demand and are expensive. Disposable chips must find cheap production methods. Researchers believe that printing technology can be used to find fast and cheap production methods

requirements for printing

the chip of RFID tag on the package involves passive transponder (transmitter). It is called passive because it has no own energy. For low-cost chips, power supply and data transmission are carried out through the inductive coupling between the transmitter and the reader

the transponder is composed of integrated circuits, antennas and other passive components. One of the most important components is the field effect transistor, which is composed of four layers. The bottom layer is the finger structure, that is, the printed circuit, which requires high printing resolution. In order to ensure that the transistor achieves sufficient switching speed, the replication accuracy is required to reach several microns. The key is the distance between the two finger elements, that is, the channel length L. The German Institute of media accepted this challenge. With the help of gravure conductive ink, it specially reproduced micron scale structures

gravure plate making

to achieve the reproduction accuracy of 1000 lines/cm, it can only be achieved by using the precise plate making. Therefore, people began to study the applicability of various plate making methods. Because the traditional engraving intaglio has the inevitable sawtooth effect, researchers did not consider engraving intaglio at first, but focused on the corrosion plate making technology. Then the production process is analyzed to minimize the accumulated errors related to each work step. Only by using bitmap instead of vector format to input imaging data, can we avoid the defective addition process. This method greatly improves the replication accuracy


in order to ensure charge transfer in the printed structure, researchers also need to find alternative wall structures. The traditional and closed hole structure is used. Because the wall cannot prevent the ink from overflowing 100%, there will always be some defects when printing wires. However, because the wall has the function of supporting the doctor blade, it is impossible to give up the wall. After repeated research and development, an open hole structure and a matching process scheme to ensure that the ink does not overflow have been developed. Although people gave up the engraving and plate making technology before, the best effect was finally achieved with the help of diamond cutters

the improved carving technology can make the carving hole have no sawtooth effect on the required wall which is only a few microns in size. The advantage of engraving plate making is that it is processed directly on the gravure cylinder. The imaging resolution of the printing plate can reach 5080dpi with the help of a diamond cutter in one process. Although the corrosion plate making technology claims to achieve the same high resolution, it needs to go through multiple processes, which cannot guarantee the accurate transfer of the specified pixels

and there are still some unreliability in corrosion plate making, which cannot be controlled in the micron range

printing test

select conductive ink for printing test. The purpose is to test its printing adaptability to fine structure through a series of analysis and research. The differences between various inks are mainly reflected in the drying performance and pigment fineness. Researchers tried to use gravure testing equipment to study the printing performance of conductive inks by changing ink viscosity, machine speed and printing pressure, and prepare recommendations. However, since the diameter of the drum of the test equipment is only 8mm., problems have occurred repeatedly in the test. Therefore, it is decided to use a plate cylinder of typical production size

the cost of conductive ink is high. From the beginning, the feasibility of testing on rotary gravure printing machine was ruled out. Due to the establishment of a good cooperative relationship, different proofing machines from gravure plate making factories can be used in the test. The traditional gravure printing ink prints only a few microns of negative text thin lines, and the effect is very good, while the conductive ink has some bad phenomena, mainly because the rheological property of the conductive ink is poor


although the high-resolution structure of only a few microns can be printed with conductive ink, some defects have been exposed in the thickness and uniformity of the printing ink layer under microscope observation. As required, these defects should be limited to the submicron range

conductive pigments of different sizes larger than a few microns decided from the beginning that the printing effect could not meet the requirements of high resolution

in order to ensure the integrity of the field effect transistor with reliable SD (source drain) structure composition, it is impossible to accept a large ink layer thickness deviation. In order to place the insulator in three sufficiently thin film layers, a flat substrate is required, and the semiconductor layer placed in it can only compensate for the unevenness of SD to a certain extent

printing experiments with traditional gravure inks have achieved good results. Therefore, the following conclusions can be drawn: whether RFID tags can be widely used in supermarkets in the future. The decision-making power is largely in the hands of ink manufacturers

rfid tag is a popular and often talked about word in the packaging, retail and logistics industry. After the "barcode" technology has been successfully applied to the above fields, we now welcome a more advanced automatic identification technology - RFlD. RFID tag is developed on the basis of electronic technology and the whole information science. It has a huge amount of information storage, flexible data format, non-contact and fast. Other advantages include the advantages of reading and writing in the automotive industry, small and medium-sized electronics and home appliance manufacturing industry and high environmental adaptability, so it has been applied in many fields at home and abroad. RFID tags have a lot of advantages in improving enterprise management level and production efficiency in the application field, reducing production costs and improving product quality. The covalent bond formed by these thermosetting photosensitive polymers through photopolymerization initiated by ultraviolet light is often permanent and superior to the ability of bar code technology

in today's information and digital globalization, people's demand for flexible and convenient RFID tags that can carry a large number of cheap pull machines that are almost scrapped in two or three years is growing exponentially. According to the analysis and prediction of FS company on the global RFID tag application market, the global RFID market will soar from US $2.0 billion in 2003 to US $10billion by 2009. Major enterprises in various countries and regions around the world are using or will soon use this automatic identification technology. Relevant international standards, such as epcglobali.uid ISO and other series of standard systems have been formed. In addition, the process is simpler and does not have the trouble of peculiar smell or frost spitting. Many countries and regions are formulating corresponding standards suitable for themselves. It is believed that RFID technology will be more widely used, and unified international standards and relevant organizations will soon be produced. Many fields, such as retail, packaging, logistics, pharmaceutical clothing, food and health products, cosmetics and other production industries, will develop faster and produce deeper changes after the application of RFID tags, bringing more and better material and spiritual enjoyment to people

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