The main principle of waterproof and moisture permeability of fabrics is that they have different diameters according to different water substances, which leads to the possibility of their transmission.
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Water vapor molecules and droplet diameter
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Wet can be understood as & ldquo; water vapor & rdquo;, refers to the formation of human body & ldquo; moisture & rdquo;. Under the condition of water vapor, water particles are very small. According to the principle of capillary movement, water particles can penetrate into the other side of the capillary smoothly, thus the phenomenon of moisture permeability occurs. When water vapor condenses into water droplets, the particles become larger. Because of the surface tension of water droplets (mutual-ldquo; pull-counterbalance-rdquo;), water molecules can not escape from the water droplets and penetrate to the other side smoothly, that is, to prevent the water penetration occurs, so water-proof function is achieved.
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Waterproof and moisture permeable fabric refers to the fact that water does not immerse in the fabric under certain pressure, but the sweat emitted by the human body can be transmitted to the outside through the fabric in the form of water vapor, thus avoiding sweat accumulation and condensation between the body surface and the fabric, in order to maintain the comfort of clothing, it is a high-tech, unique functional fabric. At present, the most widely used method is to achieve waterproof and moisture permeability through coating finishing or through laminated waterproof and moisture permeable film to achieve waterproof and moisture permeability. In addition, gas molecules are generally about 0.3 nm, much smaller than the diameter of water droplets, waterproof and moisture permeable fabrics will have a certain air permeability.
