With the rapid popularization of RFID technology applications, some large ink manufacturers have also launched new conductive inks in a timely manner, further promoting the development of the RFID market. It can be said that one of the key factors driving the RFID market's gradual success is the successful development of conductive inks.
Conductive ink is a conductive composite material formed by dispersing metallic conductive particles (silver, copper, carbon, usually silver) in the binder. After printing on the substrate, it acts as a wire, an antenna and a resistor. The ink can be printed on flexible or hard materials (paper, PVC, PE, etc.) to make a printed circuit. After the conductive ink is dried, as the distance between the conductive particles becomes smaller, free electrons move in the direction of the applied electric field to form a current, which has good conductivity and can receive radio frequency signals dedicated to RFID. For printing RFID tags with built-in antennas, a good conductive ink formulation requires good printability. The printed ink layer has the characteristics of strong adhesion, low resistivity, low curing temperature, and stable conductive properties.
According to the analysis of NanoMarkets market research company, the conductive ink market will develop into a very large industry. By 2015, the total value of the conductive ink market will be three times the current value, reaching 2.4 billion US dollars. Due to the attractive market development potential, ink manufacturers have swarmed in and started to get involved in the conductive ink business, hoping to get a slice of it.
Without the development of conductive inks, there would be no application of printing technology in the manufacture of RFID tags. Although the RFID market has continued to grow, the long-term expectation of substantial growth will also depend on the reduction in the production cost of RFID tags and its large-scale application in general commodities. Printing conductive ink will be an ideal solution to reduce the production cost of RFID tags. At present, the conductive ink used for RFID antenna printing only accounts for a very small part of the entire conductive ink market. However, industry insiders believe that in the next 10 years, the market share of conductive inks used to print RFID antennas in the entire conductive ink market will maintain rapid growth. At the same time, the share of conductive inks in the entire ink market will also increase significantly.
The currently successful application area of ​​RFID technology is smart cards. It uses HFRFID technology. The most prominent features are short reading distance, low cost, and high reliability. It is more suitable for IC bus cards and bank cards. At the same time, the demand for remote reading systems from all walks of life is also very strong, thus promoting the application of UHFRFID technology. Moreover, UHF RFID tags can replace traditional barcodes in areas such as supply chain management and are used for product tracking and identification. However, for UHF RFID tags and related systems to achieve large-scale commercial applications, they must overcome the biggest obstacle to higher tag production costs. Etching has always been the most common method of making RFID antennas. Etching RFID antennas must go through two processes: dry etching and wet etching, which makes it more difficult to reduce production costs. At the same time, etching the RFID antenna also requires a chemical treatment process, which will generate a large amount of waste liquid, so etching the RFID antenna is considered to be a very environmentally friendly process.
Conductive ink is considered to be the only technology that can win universal recognition worldwide. The method of printing RFID antenna with conductive ink only needs to go through a dry process, and does not produce a lot of waste liquid like the etching process. It is considered to be a more environmentally friendly and efficient process. In addition, printing RFID antennas with conductive ink can achieve mass production, and the scrap rate is relatively low, the antenna performance is stable, and the overall production cost of RFID tags can also be greatly reduced. Therefore, it can be said that printing RFID antennas with conductive ink will be the preferred process for making HFRFID and UHFRFID antennas.
In addition, the use of screen printing conductive ink process can also reduce the production cost of RFID tags, one of the reasons is that the investment in the introduction of printing equipment is much cheaper than the introduction of copper etching equipment. In addition, because there is no need to add additional investment to meet environmental protection requirements during the printing process, production costs and equipment maintenance costs are also lower than copper etching methods, thereby reducing the cost of RFID tags.
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