How to distinguish the water-repellent, waterproof, moisture-permeable, breathable and wind-proof fabrics? The water-repellent property of the fabric means that the fabric is specially treated by the water-repellent agent, and the surface thereof can form water droplets into a bead shape, which does not cause penetration and diffusion to wet the clothes, and achieves a water-like function like a lotus leaf (Lotus effect).
Water repellent processing is the use of this principle, a layer of ultra-fine "needle bed" is attached to the surface of the fabric with various chemical materials, so that the tension on the surface of the fabric is less than the cohesion of water, so the water droplets will form a water droplet to roll away. Not spread out. If the structure of the needle bed is flattened or covered with oil, the water repellent capacity of the fabric will be greatly reduced, and even water absorption will begin.
Waterproof: Functional treatment to prevent water infiltration. Waterproofing now uses waterproof membranes to prevent water molecules from penetrating, but the film itself is too fragile, so it depends on the surface cloth, film, and inner lining to achieve waterproof function. The water resistance is expressed by the water pressure resistance value, that is, the water pressure of the fixed area is blocked by the tarpaulin, and the water pressure value of the fabric is the highest when the surface oozes the third drop of water. Basic waterproofing ability.
Moisture Permeability: Specially refers to the function provided by the indirect breathable waterproof film, not to mention the breathability, because it is a two different ventilation mechanism, although it can finally let the sweat flow through the fabric to the outside. The moisture permeability needs to wait for the sweat to be absorbed by the hydrophilic non-porous membrane and become the sweat molecules inside. In the way of micro-Brown movement, it is moved to the outside of the film by the humidity difference between the inside and outside of the garment, and then converted into gas and discharged through the table cloth. So it is called indirect ventilation.
Breathable: In the waterproof breathable membrane, it refers to the function provided by the water-repellent porous waterproof membrane. Ventilation is a gas that allows gas to pass directly through the "water-repellent porous membrane". It is called direct ventilation because of its high speed.
Windproof: As long as the fabric has a certain windproof function, the closer the fabric is woven, the stronger the windproof ability. The wind resistance is generally strong when the air permeability is not good. High-quality fabrics combine breathability and wind resistance.