【 Weak current College 】 printing technology and the RFID tag production 】

Printing technology in the manufacturing of the RFID tag, this will be a very useful attempt. With the printing process parameters of continued to deepen, conductive ink formulation and continuous improvement will make the printing technology in the manufacturing of RFID labels play an important role.
RFID tags, RFID tags, belongs to a smart card. RFID is a non-contact radio frequency for bi-directional communication of recognition, it appears in World War II, the 70 's started, start the massive use of the 90 's. Technology has been widely used in various areas of our lives, such as the most simple access control card, bus fare card, campus card, etc. F R I D technology in retail applications, wide recognition of a pattern is "future shop" mode. In the future shop, all goods are affixed with RFID tags. Customers in the shop contact to RFID technology has two offices: the so-called smart shelves and intelligent cashier. Smart shelves, rack is equipped with a F R I D label scanner, it will automatically prompt the goods from the shelves and placement errors, resolve time replenishment and correct the problem on the goods; the shop no longer exist traditional cashier, a smart cashier. Smart cashier can install through a R F I D label scanners at the exit of the screen. The customer's cart through the screens, all car purchase products instantly be scanned while the smart checkout automatically charged to your credit card on the turn off the total cost of all goods. This enables customers to easily checkout, no longer need a long time in traditional remembers queued. First, RFID tags cost obstacle from the above application mode, you can see the R I F D label brings us more convenient and more efficient consumption life. However, in order to achieve each of the commodities are put on RFID tags, there is a long way to go, where the bottleneck is the RFID tag cost is relatively high. For now, the cost of each label has already fallen to below $ l, 20 ~ 70 cents. This is the high price of the product is fine, but for many items such as toothbrushes, pencils so cheap goods, will be treated as a cost barriers. Therefore, it is necessary to comprehensively promote RFID label should guarantee label performance reduce the manufacturing costs of the label. Second, the cost of printing technology to label advantage RFlD label main can be divided into three main categories: passive RFID tags, semi active RFID tags and active RFID tags. For retail packaging F R I D tags are generally passive R F ID, it is a passive F R I D label, because it needs to accept reader emits electromagnetic signal that induces currents, and issue the electromagnetic signal to readers, tags and readers for information transfer between. The structure of this tag are: material, generally chips and built-in antenna (coil). Current coil manufacturing methods are: copper wire enwinding, chemical etching, electroplating and direct printing method. These four methods in focus on the development of direct printing method, because the method has the antenna high speed printing, supplies low-cost advantages, which can significantly reduce the cost of RFID tags. Third, the conductive ink impetus direct printing antenna technology, conductive ink is an important driving force. No conductive inks, no printing technology in the RFID tag manufacturing applications. Conductive ink by some easy conductive particles, resin or more special raw materials, such as conductive polymers. Conductive ink through the print to the substrate is dry, because the distance between the conductive particles, free electrons move along the applied electric field orientation form current, with good electrical conductivity, allowing to play the role of the antenna of printing ink. Conductive ink quality for improving performance, reducing ink consumption is is important. A good conductive ink formulations, requires a good printability, after printing with strong adhesion, resistance is low, the low curing temperature, conductivity stability characteristics. 4. direct printed antenna technology at present, direct printing antenna method is still in the research phase. The RFID tag antennas printed, since different operating frequency of the antenna coils for RFID tag will correspond to a different number of turns, coil thickness and each circle distance (e.g. HF bands use 13.56MHz chips, typically it requires coil number is 6, thickness of about 20 μ m. UHF-band using 868MHz and 950MHz chips, coil section thickness is approximately 4 μ m. ), So the printing ink thickness, width of each line and dry the graphics profile has strict tolerance range (such as two overlapping set of error must be within the 0.1mm). Research carried out using silk-screen printed antenna directly, get the following useful experience: mesh selection hexagonal hole-to facilitate the transfer of conductive inks completely; the selection of conductive ink solvent based inks better; to create excellent ink drying conditions (such as a decrease in wind speed oven, heating temperature of 140 ° c, heating time of 30 seconds and 120 seconds), to print the exact outline of the coil shape forming. Currently, Switzerland is a rotary screen printing equipment companies have for smart label printing has a dedicated production line. Germany Stuttgart media University in research conducted direct gravure printing test R FID label, get the following useful conclusions: the best way is to use a diamond plate-making electronic engraving method, the resolution selected in the 5080dpi. At this time almost no jagged edges, and can accurately transmit cell; front plate-making the desired image file format uses a bitmap format, this graphic information is lost; for network structure, need to use a special kind of different from traditional network point of an open network points. If you use the traditional network points, then network points of net wall will turn the conductive ink split open, could not form a coherent; open mesh points both reserved NET wall can easily solve the network wall split ink. Printing technology in the manufacturing of the RFID tag, this will be a very useful attempt. With the printing process parameters of continued to deepen, conductive ink formulation and continuous improvement will make the printing technology inRFID label manufacturing play an important role.