The vapor barrier layer of the PE film prevents water molecules from passing through, which prevents the permeation of water and makes the breathable film waterproof. The polypropylene film of spunbond polyethylene and polypropylene film generally refers to biaxially oriented polypropylene film. Biaxially oriented polypropylene film (BOPP) is usually a multi-layer pneumatic film. After polypropylene particles are pneumatically formed into sheets, they are made by stretching in two directions, due to the stretching molecular direction.

Polypropylene film of spunbond polyethylene and polypropylene film generally refers to biaxially oriented polypropylene film. Biaxially oriented polypropylene film (BOPP) is usually a multi-layer pneumatic film. After polypropylene particles are pneumatically formed into sheets, they pass through two directions. The film has excellent physical stability and mechanical strength due to the stretched molecular direction.

The film has excellent physical stability, mechanical strength, air tightness, high transparency and gloss, tough, wear-resistant, widely used printing film, the thickness is generally 20 ~ 40 m, the most commonly used is 20 m, two-way stretch The main defect of the stretched polypropylene film is the weak heat sealability, so it is generally used as the outer layer film of the composite film such as moisture-proof, transparent, strength, rigidity and printability after being compounded with the polyethylene film. The surface of the stretched polypropylene film is non-polar, high in crystallinity, and low in surface free energy, which leads to a decrease in printing performance and a decrease in the adhesion to ink and adhesives, which requires surface treatment in the printing and laminating lines.