The polypropylene film of breathing paper 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.

European and American architects have found that traditional waterproof materials (such as PE membrane, asphalt waterproofing membrane, etc.) due to their airtight properties, cause the water vapor in the building envelope to be blocked for a long time, causing the roof and wall to become damp and breed mold. , Indoor air quality and living environment are seriously threatened. Due to the intrusion of water vapor, it seriously affects the performance of building insulation materials, thereby increasing building energy consumption. Water vapor condensation also accelerates the aging of building materials and affects the durability of buildings. Experts in the construction industry After years of research, the waterproof breathable membrane was developed in the late 1980s and vigorously promoted by Europe and the United States. The waterproof breathable membrane is widely used in civil and commercial buildings.

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.