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Waterproof breathable film (breathing paper) is a new type of polymer waterproof material. In terms of manufacturing technology, the technical requirements of waterproof and breathable film are much higher than those of common waterproof materials, and in terms of quality, waterproof and breathable film also has functional characteristics that other waterproof materials do not have. Waterproof breathable film principle of Work: In the State of Water Vapor, water particles are very small, according to the principle of capillary movement, can be successfully penetrated to the other side of the Capillary, resulting in vapor permeability phenomenon. When Water Vapor condenses into droplets, the particles get larger, and because of the surface tension (the water molecules“Pull” each other) , the water molecules can't get out of the droplets and permeate to the other side, which prevents the water from permeating, the breathable film has the waterproof function. Waterproof and breathable film material: The technology of waterproof and breathable film is introduced from European and American countries. However, the manufacturing process of domestic products is varied, and the quality of products from different manufacturers is uneven, so a uniform quality standard can not be formed. In fact, waterproof breathable film mainly consists of three layers: PP spunbonded non-woven fabric, PE polymer breathable film, PP spunbonded non-woven fabric. The function of spunbonded non-woven fabric is to enhance tension and hydrostatic pressure and to protect the Middle Layer (breathable film) . The article content comes from the network, if has the question, please with us!