principles and characteristics of tpu waterproof and breathable membrane

the principle of tpu waterproof and breathable membrane is: in the state of water vapor, the water vapor particles are very small, much smaller than the diameter of the pores of the waterproof breathable membrane. according to the principle of capillary movement, it can penetrate well from the inside to the capillary to the outside, thus allowing vapor permeability to occur. phenomenon. when water vapor condenses into water droplets, the particles become larger. due to the surface tension of the water droplets (water molecules "pull and compete" with each other), and the particle size of the water droplets is much larger than the diameter of the pores of the waterproof and breathable membrane, so water molecules cannot smoothly break away from the water droplets and penetrate to the other side, which prevents water penetration and makes the tpu waterproof and breathable membrane have a waterproof function.

main features of tpu waterproof and breathable membrane:

1. waterproof: 0.1-1.0 micron micropores, the pore diameter is 10,000 times smaller than water beads, preventing moisture from passing through, effectively protecting sensitive components, avoiding liquid erosion, and extending the service life of the product.

2. breathable: the micropore diameter is 700 times larger than water vapor. while waterproof, it allows air to pass smoothly, which can effectively dissipate heat, prevent fogging on the inner wall of the product, and balance the air pressure in the internal and external spaces.

3. dustproof: the microporous channels form a mesh-like three-dimensional structure in the membrane, and the micropores are evenly and densely distributed, blocking dust and achieving effective dustproof effect, and can capture particles as small as 0.01 micron.