Instant food is food that can be eaten quickly. As the pace of life accelerates, people's eating habits are also changing. Due to the busy work and study, there is no time to eat a meal seriously, and often choose fast food to solve their three meals. The fast food era has quietly arrived. According to the types of food and the eating habits of the Chinese people, fast food can be divided into the following three types: 1. Fast food in fast food includes staple food and non-staple food, such as Chinese-specific fast food and McDonald’s, KFC, pizza, etc. 2. Convenience food. Convenience in fast food refers to food that is partially or completely processed and mature, and can be eaten with a little or no processing before eating. Such as quick rice, instant noodles, frozen dumplings, canned food, etc. 3. Snacks often refer to snack-type fast foods in the traditional sense. Such as puffed foods, nuts and other foods. Before buying instant food, you should check the relevant signs on the outer packaging, such as production date, shelf life, factory name, factory address, ingredient list, food additives, etc. are complete. At the same time, pay attention to the packaging and form of instant foods, carefully check whether the packaging leaks or bulge, and see if there is a food production license number on the outer packaging. No product. In addition, as a food manufacturer, a complete packaging label is easier to gain the trust of consumers. In addition to allowing consumers to understand the production process of the product, it also has the effect of establishing a brand image and building a reputation for the product. Inkjet printers play an important role in product traceability. For example, the product's batch number, production date, delivery quantity, dealer address and other information can be traced through the QR code on the product packaging.