The inkjet printer is a device that is controlled by software and uses a non-contact method to mark the product. Its working principle is to use charged ink particles and the characteristics of high-voltage electric field deflection to print patterns, characters and numbers on the surface of various objects. It is a high-tech product integrating mechatronics. It can be used to print production date, batch number, barcode, trademark pattern, anti-counterfeiting mark and Chinese characters. It is a powerful equipment to implement the sanitation law and promote packaging modernization. Now, the application of inkjet printers has been very extensive, because inkjet printers are very necessary products, the following is the necessity of using inkjet printers: 1. It is conducive to product identification. By marking special logos, brand names and trademark patterns on products, products can quickly attract consumers' attention, so as to stand out in fierce product competition and ultimately achieve the effect of improving brand awareness. 2. The need for product tracking records. The batch number, shift or production date of the product are directly printed on the product, so that each product has a good traceability, which greatly facilitates the quality management of the enterprise and the regional management of the product. 3. Prevent counterfeiting. Manufacturers can prevent and suppress the occurrence of counterfeit sites by marking products. The application of this new technology enables legitimate manufacturers to stay ahead of counterfeiters. 4. Increase the added value of the product. Labeling a manufacturer or labeler on a product means a promise. Consumers usually think that this is a product of a company that has relatively complete quality tracking and is responsible for product quality. Inkjet printers have been widely used in food, beverages, building materials, wire and cable, medicine, chemical industry, electronics and many other industries. This shows the necessity of using inkjet printers. Therefore, it is especially important to choose the most suitable inkjet printer for the product category.