As an important material in food packaging, food paperboard has certain characteristics in its structure. The basic structure of food paperboard includes surface layer, core layer and bottom layer.
The surface layer is located at the outermost layer of food paperboard, which mainly plays a protective and decorative role. It can resist the influence of external environmental factors such as air and moisture on food, and also affects the appearance quality of food paperboard. The surface layer will focus on its smoothness, whiteness and other indicators in raw material selection and processing technology to ensure that the food has a good appearance.
The core layer is the main part of food paperboard, which plays a key role in supporting and maintaining the stability of the overall structure. It needs to have sufficient strength and toughness to ensure that the food paperboard will not be easily deformed or damaged during transportation and storage. In the preparation process, the selection and ratio of the core layer raw materials are crucial, and the ratio of different ingredients will affect the physical properties of the core layer.
The bottom layer is in direct or indirect contact with food, so it has strict requirements on food safety and barrier properties. While preventing food from being contaminated, it also needs to have certain moisture-proof and oil-proof functions.
In order to improve the overall performance of food paperboard, a series of post-processing procedures will be carried out after each layer is completed. For example, sizing can be used to improve the water resistance and oil resistance of paper, further ensuring the storage safety of food. By carefully designing the structure of food paperboard and performing reasonable processing, it can better meet the needs of food packaging and ensure the quality and safety of food. This is also an important reason why food paperboard is widely used in the food packaging industry.