Food is packaged in the process of processing, transportation, storage, sales, and consumer use. Food packaging containers usually refer to direct contact with food.
A packaging container, that is, an inner packaging container. Foods that are packaged using packaging containers or packaging materials (usually referred to as packaging in a processing plant) are referred to as packaged foods. Food packaging has many functions. The primary purpose is to preserve food, protect food from external physical, chemical and microbiological effects, maintain food quality and extend the storage period of food. The use of sealed packaging containers enables the processing, storage and transportation of foods to be carried out in an industrialized manner, enabling the development of fragmented food processing and technology into food engineering and industry. The research area of food packaging containers usually includes food packaging materials, food packaging machinery and food packaging technology. Food packaging containers first involve food packaging materials, but are closely related to packaging machinery and packaging technology. The main properties required for food packaging materials are: isolation from oxygen, water vapor and microorganisms, resistance to food corrosion, compliance with safety and health regulations, etc. Food packaging containers should generally have a certain strength, reliable sealing, good appearance, suitable for food filling machinery production, and convenient for consumers.