From the point of view of packaging performance, the requirements of food packaging bags can be divided into internal and external parts.

1. Internal requirements: The inherent requirements of food packaging refer to the technical requirements of quality and quantity of food in its packaging through packaging.

Strength requirements: refers to the packaging can protect the packaged food in storage, stacking, transportation, handling process against various external destructive forces, such as pressure, impact and vibration force. There are many factors related to the strength of food packaging, such as transportation mode (such as automobile, aircraft), stacking form (such as multi-layer stacking, cross stacking) and environment (such as climate, sanitary environment).

Barrier requirements: Barrier is one of the important properties in food packaging. Many foods are stored and packaged. Because of poor barrier, the flavor and quality of food change, which ultimately affects the quality of food. Barrier requirements are determined by the characteristics of food itself, which are characterized by external barrier, internal barrier or selective barrier, etc. The barriers are air, water, grease, light, microorganisms and so on.

Respiratory requirements: Some distant food products, such as fresh fruits and vegetables, still maintain breathing function in the process of packaging and storage. Therefore, such packaging materials or containers have breathability, or can control breathing, so as to achieve the purpose of preservation.

Nutritional requirements: Food in the packaging and storage process, will gradually lose nutrition, so food packaging should be conducive to the preservation of food nutrition, more ideal is to lock nutrition through packaging. Other requirements of packaging manufacturers: There are many inherent requirements of food packaging, such as heat resistance requirements, light protection requirements, shatterproof requirements, moisturizing requirements, etc.

2. External requirements: The external requirements of food packaging are to use packaging to reflect the characteristics, performance and image of food, which is the external visualization and expression form and means of food.

Safety requirements: Food packaging safety includes hygiene safety, handling safety and use safety. Hygienic safety means that food packaging materials should not contain harmful substances to human body. In packaging technology, packaging bag manufacturers should keep the nutrients, color and taste of processed food as unchanged as possible. Transportation safety refers to the packaging that can ensure the safety in the process of transportation, loading and unloading. It should also include the safety of consumers when shopping and after purchasing. Safety of use is to ensure that consumers are not harmed in the process of opening and eating.

Promotional requirements: Food packaging is one of the best means of food promotion. The properties, characteristics, eating methods, nutritional components and cultural connotations of food can be propagated in packaging. The promotion of food packaging includes: necessary information promotion, image promotion, color promotion, structure promotion, etc.

The external requirements of food packaging bags also include convenience requirements, prompting requirements, interesting instructions requirements and emotional instructions requirements.