In the Fashion outdoor fabric state of water vapor, the water particles are very small. According to the principle of capillary movement, they can smoothly penetrate the capillary to the other side, thereby causing vapor transmission. When the water vapor condenses and turns into water droplets, the particles become larger. Due to the surface tension of the water droplets the water molecules "pull against each other, the water molecules cannot smoothly escape from the water droplets and penetrate to the other side, which is to prevent Water infiltration occurs, giving the vapor permeable membrane a waterproof function.
Types of waterproof and breathable fabrics: There are mainly two types: water-resistant and waterproof. The former is divided into fiber/cloth type not windproof but good breathability and membrane type windproof but poor breathability the latter is generally breathable Membrane type, two-layer or three-layer, windproof, two-layer is softer than three-layer and has better air permeability, and three-layer is stronger.
Water-resistant or highly water repellent fabrics will seep when pressure is applied, for example, when you are wearing pants of this material and sitting on a wet stool.The development of completely waterproof and breathable fabrics waterproof began in the late 1970s. The current 2nd generation products are completely waterproof and windproof and maintain good breathability.
However, garments made of this kind of fabric are not necessarily completely waterproof, mainly because of water seepage in the seams or zippers. To ensure that the garment is completely waterproof, you need to press glue at all seams good garments use waterproof strips. This requires a lot of labor and cost, which is one of the reasons why such clothes are expensive.
