As a barrier material, PVA has excellent resistance to oil and solvents, excellent oxygen and other gas barriers, and is currently one of the best polymer barrier materials. Starch/PVA active film is used in food packaging, which can effectively inhibit the growth of microorganisms and lipid oxidation in food. It is ideal for anti-fogging and anti-condensation, and is permeable to water vapor and impermeable to water, so as to achieve true preservation and quality preservation, thereby extending the shelf life of food. Its preservation effect is mainly achieved through the antibacterial and antioxidant effects of the film.

For example, plastic wrap: The loss rate of fruits and vegetables in my country during picking, transportation, storage and other links is as high as 25% to 35%, and the annual consumption of fruits and vegetables is as high as 200 million tons, with a value loss of more than 100 million.