Principle analysis of waterproof breathable membrane
details
Waterproof breathable membrane is a new type of polymer waterproof material. In terms of production process, the technical requirements of waterproof and breathable membrane are much higher than that of general waterproof materials; at the same time, from the quality point of view, waterproof and breathable membrane also has functional characteristics that other waterproof materials do not have. The principle of waterproof and breathable membrane is How is it? Let's learn about it with Goel editor~
The principle of waterproof breathable membrane
What is the principle of waterproof breathable membrane - the working principle of waterproof breathable membrane
In the state of water vapor, the water particles are very small. According to the principle of capillary motion, they can smoothly penetrate into the capillary to the other side, so that the phenomenon of ventilation occurs. When the water vapor condenses into water droplets, the particles become larger. Because of the surface tension of the water droplets (the water molecules "pull and compete with each other"), the water molecules cannot smoothly escape from the water droplets and seep out to the other side, that is, It prevents the infiltration and exudation of water, so that the breathable membrane has a waterproof function.
The technology of waterproof and breathable membrane has been introduced from European and American countries. However, the production process of domestic products is varied, and the quality of products of various manufacturers is uneven, and a uniform quality scale has not been formed. In fact, the waterproof breathable membrane is mainly composed of three layers: PP spunbond non-woven fabric, PE polymer breathable membrane, and PP spunbond non-woven fabric. The function of spunbond non-woven fabric is mainly to enhance the tensile force and hydrostatic pressure and protect the middle layer (breathable film). The real breathability mainly depends on the middle layer of PE polymer breathable film.
