Barrier films are multi-layered films produced by extruding a material with strong gas barrier properties with a polyolefin material that has strong heat-sealing and moisture barrier properties. They possess excellent barrier properties and are widely used in food packaging, pharmaceutical packaging, electronic device encapsulation, and many other fields. Below is a detailed introduction to several common types of barrier films.
PVA-Coated High-Barrier Film
PVA-coated high-barrier film is made by coating PVA (with added nano-inorganic materials) onto polyethylene film, followed by printing and lamination. It has extremely low oxygen barrier properties, significantly superior barrier performance compared to other similar films, and a substantial reduction in packaging costs. This film can be used not only for packaging liquid foods such as beverages, juices, and milk, but also for packaging condiments such as soy sauce and vinegar.
PVDC High-Barrier Film
PVDC high-barrier film is one of the most widely used high-barrier packaging materials. It features low permeability, strong barrier properties, and chemical resistance. PVDC-coated film offers excellent barrier performance and is inexpensive, making it widely used in vacuum packaging and preservation packaging for various foods. However, its environmental friendliness is somewhat limited due to the presence of chlorine in PVDC.
EVOH High-Barrier Film
EVOH high-barrier film is a material with excellent gas barrier properties. Its barrier performance depends on the ethylene content, and it also boasts excellent transparency, gloss, and mechanical strength. In the packaging industry, EVOH is often used as an intermediate barrier layer in composite films to improve the overall barrier performance of packaging. In addition, EVOH can also be used to make single-layer films for specific packaging needs.
Other Types of Barrier Films Besides the three common barrier films mentioned above, there are also nylon-based high-barrier films, inorganic oxide coated films, etc. These films each have their own characteristics in terms of barrier properties, mechanical properties, and temperature resistance, and can be selected and applied according to specific needs.
