Application of RFID Technology in the Whole Process of Cold Chain Logistics

With the gradual development of cold chain logistics, more and more attention has been paid to the effective combination of RFID technology and cold chain logistics Refrigerated and frozen goods are always required to be in the specified low temperature environment in all links of production, storage, transportation and sales to ensure the quality and performance of goods, so strict temperature management is often required in the logistics process.

The application of RFID technology can master the quantity and location of frozen products in the supply chain, timely pick up and replenish goods, and provide traceability information support for food safety review Cold chain logistics refers to a systematic project that refrigerated / frozen food is always in the specified low temperature environment in all links of production, transportation, storage and sales, so as to ensure food quality and reduce food consumption. Refrigerated and frozen goods are different from general goods. Refrigerated and frozen goods should be kept in a low temperature state in all links of production, processing, storage, transportation and sales. The main application fields of cold chain logistics are as follows: (1) primary agricultural products, such as fruits and vegetables, meat, poultry and eggs, aquatic products and flower products; (2) Processed food, such as frozen food Ice cream and dairy products; (3) Special commodities, such as drugs, biological donors and blood. According to the definition of cold chain logistics, cold chain logistics includes four links, and each link should be seamlessly connected, otherwise the cold chain will break. The application scale of the industry continues to expand, which has enriched and improved the theory of RFID technology. In particular, Wal Mart, the world's leading retailer, announced that RFID is widely used and the U.S. military announced that military supplies use RFID for identification and tracking, which has greatly promoted the research and application of RFID technology. RFID radio frequency identification is a non-contact automatic identification technology. It automatically identifies the target object and obtains relevant data through radio frequency signals. The identification work does not need manual intervention, and can work in various harsh environments. RFID technology can identify high-speed moving objects and multiple tags at the same time, which is fast and convenient to operate. Short distance RF products are not afraid of harsh environments such as oil feed and dust pollution. They can replace bar codes in such environments, and the recognition rate is higher than that of general electronic bar codes. RFID system consists of three basic parts, namely electronic tag, reader and antenna. The electronic tag is attached to the object to identify the target object and is used to store the relevant information of the goods. The electronic tag has the characteristics of waterproof, antimagnetic and high temperature resistance, long service life and large reading distance. In addition, the data on the tag can be encrypted, the storage capacity is larger, and the stored information can be changed freely; The reader is a device for reading or writing tag information, which can be designed as a handheld or fixed type. The reader and the electronic tag can transmit information to each other according to the agreed communication protocol. Generally, the reader and writer send commands to the electronic tag, and the electronic tag will send back the identification data in the memory to the reader and writer according to the received command of the reader and writer. The reading distance of the reader varies from 0 to 100m; An antenna is a device that transmits RF signals between a tag and a reader.  

RFID is an important force to promote the development of precision agriculture in the next few years. Record crop and field management information, such as soil pH, temperature and humidity, sunshine, rainfall, pesticide use, etc., to achieve scientific and accurate planting. The process of precooling after picking and before loading fruits and vegetables, quickly removing the field heat from the freshly harvested products before transportation, storage or processing, and reducing their temperature to the appropriate temperature. Precooling can remove field heat, rapidly reduce product temperature, control physiological and biochemical changes of fruits and vegetables after harvest, reduce respiration, and reduce the loss of water and nutrients. In order to maintain the fresh quality of fruits and vegetables and extend the shelf life to the greatest extent, precooling is best carried out in the production area, and the faster the better. If precooling is not timely or thorough, it will increase the post harvest loss of products.

The formula is "breeding farm slaughterhouse logistics service provider seller". Both slaughterhouses and sellers use professional refrigeration equipment for meat storage. The hidden danger of the problem is easy to occur in the transportation process, because the control of the refrigeration environment during the transportation is relatively complex. If the environmental temperature is improperly controlled or the transportation cycle is too long, the meat products may rot, Finally, it will cause economic losses and personal injury.  

At present, most of the refrigerated goods transportation monitoring processes only record the in transit information of vehicles, and the temperature information can only be checked after arriving at the destination. They can not collect the in transit temperature information of refrigerated goods in real time, and can not effectively feed back the information of vehicles and goods. RFID replaces the traditional bar code, on the one hand, it can grasp the temperature changes in the refrigerated vehicles in real time, Ensure that the goods are fresh and safe when they arrive at the receiving point. On the other hand, RFID tags store a large amount of goods related information. The traditional barcode can only tell the staff what the goods are. RFID tags can let the staff know when and where the goods are produced, delivery standards, precautions and who the consignee is. This can greatly improve work efficiency.