The food inkjet printer can print multiple lines of information, including one-dimensional, two-dimensional barcodes, LOGO, graphics, variable barcodes, anti-counterfeiting codes, supervision codes, numbers, texts, databases, etc. The bar code information of food can include information about production, warehousing, transportation, processing, and distribution. It mainly includes functions such as tracking product quality, post-information traceability, and anti-counterfeiting. The identification of food packaging can also improve brand image, attract consumers, prevent counterfeiting, prevent cross-selling, facilitate sales, and effectively supervise and so on. In this way, all aspects of food production and sales are supervised, quality is guaranteed, and food safety is greatly improved. Food inkjet printers have become the first choice for surface marking on food packaging. The application of inkjet printers in food packaging identification. The application of inkjet printers in small food packaging identification. The general small food packaging identification inkjet printer is called Continuous Ink Jet Printer (CIJ type for short). Also known as small character inkjet printer, it uses pressure to continuously eject ink from a single nozzle. After the crystal is oscillated, it breaks to form ink dots. After the ink dots are charged and deflected by high voltage, they are scanned into characters on the surface of the moving object. The application of the inkjet printer in the identification of food outer packaging cartons The inkjet printer used for the identification of food outer packaging cartons is called the drop on demand inkjet printer (Drop on Demand), referred to as the DOD type, and also known as the large character inkjet printer. The nozzle of the ink supply system is composed of multiple high-precision valves. When printing, the valve corresponding to the font opens and closes quickly. The ink is ejected by the constant internal pressure to form characters or graphics on the moving surface. The latest DOD print head can make colors on the paper with more accurate dots to form a collection, the jet printing effect is more similar to the traditional offset printing. For some enterprises that have integrated production, need to change carton information, and require high external packaging surface quality, large-character inkjet printers have gradually received extensive attention and use. In developed countries, large-character inkjet printers for outer box packaging labels have long been used, and they play a great role in the effective management of the logistics industry. Inkjet printers need to increase technical efforts in the following aspects. The inkjet printers on the food production line need to be stable and reliable. The food industry belongs to the fast-moving consumer goods industry. The stability and reliability of the production line is the most concerned issue for food companies. For inkjet printers, the nozzles are easy to block. The problem that causes downtime is most likely to cause trouble for food companies, which is also one of the technical difficulties of inkjet printer competition. First of all, when the machine is not working, the recovery device returns to the nozzle position under the drive of the automatic moving system. The nozzle sealing technology will reliably seal the nozzle and the recovery device, and it will automatically open when it needs to run and print, so that it is completely avoided. In this way, dust and impurities adhere to the nozzle and cause the ink line to be skewed at the start of the machine, which effectively prevents the nozzle blockage caused by the solidification of the ink, improves the production efficiency, and makes the use more stable and reliable. Secondly, the timer switch function can automatically circulate the printing ink. Therefore, food companies do not need to worry about the nozzle clogging due to the solidification of the printing ink during long holidays. In addition, food companies can also set automatic switch on and off at any time. Third, the built-in diaphragm pump can generate system pressure through the transmission device without mechanical wear, which can extend the life of the pump, eliminate impurities caused by pump wear, and make the ink system cleaner, thereby reducing system blockage. Possibility, reducing the number of ink circulations, and ultimately reducing the solvent volatilization caused by the air intake system, and the ink composition is more stable. Finally, the use of low-vacuum recovery technology and thin recovery tubes can save 50%-70% of solvents. At the same time, the consumable parts filter will last longer and the overall performance of the machine will be more stable. Food companies need to use safe inkjet printers. Accompanying the global environmental protection themes, the price of environmentally friendly raw materials has generally risen. Food companies have not been spared and suffered cost pressure. Therefore, the energy-saving problem of inkjet printers has also become a problem. This is an important part of cost control in food companies. For example, food production requires food-grade ink, which is a chemical substance. How to ensure the safety of edible items is a problem that both food companies and inkjet printer manufacturers need to consider. Today, inkjet printers have been more and more widely used in the packaging and marking of various foods. How to better ensure the stable performance of inkjet printers, increase wiring speed, and reduce usage costs, etc., will be a long period of time. Metropolis is a topic of concern to food companies, and the corresponding technical issues will surely become key issues that inkjet companies need to continue to study. These issues will be continuously discussed, researched and developed until new products come out, and this process will continue to cycle again and again.