Cling film is a thin plastic film with "self-adhesive" property, which can be attached to the container well to isolate the food from the surrounding environment, so as to prevent the loss of food moisture and retain most of the fresh taste.

In addition to freshness preservation, the use of cling film can also reduce the entry of bacteria in the air into food, avoid the entry of other odor molecules, and prevent the "cross flavor" between different foods. In addition, if some fruits are kept fresh with cling film, the contact with the outside air will be reduced, and the color change and nutrient loss caused by oxidation will be delayed.