Introduction to barrier film
Polypropylene films of spunbond polyethylene and polypropylene films generally refer to biaxially oriented polypropylene films. Biaxially oriented polypropylene films (BOPP) are usually multilayer pneumatic films. After polypropylene particles are pneumatically formed into sheets, they pass through two directions. The stretched film has excellent physical stability and mechanical strength because of the stretched molecular direction.
Air tightness, high transparency and gloss, tough, wear-resistant, widely used printing film, the thickness is generally 20 ~ 40 m, the most widely used is 20 m, the main disadvantage of biaxially oriented polypropylene film is heat sealability Therefore, it is generally used as the outer film of the composite film such as moisture-proof, transparency, strength, rigidity and printability after compounding with polyethylene film. It is suitable for storing dry food. The surface of biaxially oriented polypropylene film is non-polar and crystalline. High density and low surface free energy result in decreased printing function, decreased adhesion to inks and adhesives, and require surface treatment before printing and lamination.