Barrier film for a single or multi-layer film structure, it can cut off or reduce gas, fragrance, steam and even ultraviolet transmission between the inside and outside of the package, to moisture-proof taste and other functions, so mainly used for fresh food packaging.

Feng Fulai developed EVOH/PE barrier film, and PE film composite thickness in 90um, or can be thinner, the indicators fully meet BB/T 0052-2017 "liquid milk co-extrusion packaging film, bag" standard; The oxygen transmittance was 5cm3/m2· 0.1mpa ·24h, and the water vapor transmittance was 4.6g/m2·24h.