The waterproof principle of waterproof tarpaulins

Many people think that use waterproof tarpaulins waterproof because the PE film coating technology, like the cloth covered with a layer of plastic film. In fact this is wrong, what is the principle of waterproof tarpaulins? In theory, the fabric of waterproof and breathable fabric is a pair of contradiction. A kind of fabric waterproof performance is good, then its permeability is poor; On the other hand, a breathable fabric performance is good, then its waterproof performance is poor, to solve this contradiction is the key to the development of waterproof breathable PE tarpaulin. We all know, water molecules small 100 microns in diameter, but the large diameter steam is 0. 0004 microns, the diameter difference is very big, reached nearly 250000 times. Some people say waterproof and breathable is contradictory, but can be solved, we can make the fabric waterproof coating a pass, such as pore size is too small, waterproof properties is good, but with poor permeability, conversely has a different effect. Tent, tent factory, tarpaulins, http://www. linyangpvc。 com/