Inner requirement: the inner requirement of the food bag is the technical requirements for the quality and quantity of the food in the package.
Strength requirements: refers to the packaging can protect a packaged food in the process of storage, stacking, transport, handling, and resist external damage, such as pressure, impact and vibration force. Food packaging strength requirements related to many factors, mainly in the mode of transport (such as automobiles and airplanes), stacking forms (such as multi-storey piling, cross stacking) and environment (such as three categories of factors, climate, health and the environment).
Barrier requirements: barrier property is one of the important properties of food packaging. A lot of food in storage and packaging, due to changes in the barrier errand food flavor and quality, and ultimately affects the food quality. Barrier properties are determined by the characteristics of the food itself, which has the characteristics of the external barrier, the inner barrier or the selective barrier, etc..
Nutritional requirements: food in the packaging process, will gradually loss of nutrition, so, food packaging should be conducive to the preservation of food nutrition, the more ideal is to lock the nutrition through the packaging.
External requirements: the external demand of food packaging is the use of packaging to reflect the characteristics of food, performance, image, is the external image of food and performance forms and means. Safety requirements: the safety of food packaging, including health and safety, transportation safety and the use of safety, etc.. Health safety refers to the food packaging materials should not contain harmful substances in the human body, in the packaging technology, so that the processed food in the nutritional composition, color, taste and so on as far as possible to maintain the same. Handling safety is the safety problem in the process of transportation and loading and unloading, including the safety of consumers in the purchase and purchase.