How to Lay Waterproof and Breathable Membrane

Principle of waterproof and breathable membrane
In the state of water vapor, the water particles are very fine, and according to the principle of capillary movement, they can smoothly penetrate into the capillary to the other side (in our products, they can pass through the plastic layer in the center), and then vapor permeability occurs. When the water vapor condenses into water droplets, the particles become larger. Due to the effect of the surface tension of the water droplets (the water molecules "pull and compete" with each other), the water molecules cannot smoothly separate from the water droplets and penetrate to the other side, which is to avoid The penetration of water occurs, so that the vapor permeable membrane has the function of waterproofing.
Waterproof and breathable membrane material
The technology of waterproof and breathable membranes was first introduced from European and American countries. However, the manufacturing processes of domestic products are varied, and the quality of products from various manufacturers varies, failing to form a consistent quality standard. In fact, the waterproof and breathable membrane mainly consists of three layers: PP spunbonded non-woven fabric, PE polymer breathable membrane, and PP spunbonded non-woven fabric. The effect of spunbonded non-woven fabric is mainly to enhance the tensile force and hydrostatic pressure and maintain the central layer (breathable membrane). The real breathability mainly depends on the PE polymer breathable membrane in the central layer.
The price of waterproof and breathable membrane
The price of waterproof and breathable membrane mainly consists of raw materials, production process, and equipment investment capital. At present, some manufacturers in China say that the waterproof and breathable membrane is an auxiliary material, the cost is very low, the price is low, and it is not higher than the main material such as insulation cotton. This is nonsense. This kind of rhetoric is purely entrapping and misleading consumers. Because these manufacturers do not master the production process of waterproof and breathable membranes at all, they use very crude film-coated non-woven fabrics or hot-melt adhesive spraying composite non-woven fabric equipment to produce fake and shoddy waterproof and breathable membranes, misleading consumers with fallacies , to achieve ulterior motives.