The polypropylene film of the barrier film spunbond polyethylene and polypropylene film generally refers to the biaxially oriented polypropylene film, and the biaxially oriented polypropylene film (BOPP) is usually a multilayer pneumatic film. Made by stretching in one direction, the film has excellent physical stability and mechanical strength due to the stretched molecular direction.

To ensure the thermal insulation performance of the building, improve the air quality of the room, and make the living environment more warm, the waterproof vapor barrier film must have good air tightness. It can help prevent airflow intrusion, reduce energy consumption, and prevent moisture from overflowing the wall cavity. The waterproof vapor barrier film must have good water resistance, it can assist in maintaining the wall and prevent water from invading from the outer wall cover, and the waterproof vapor barrier film must have moderate water vapor permeability.

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 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 printing and laminating lines.