| There are two kinds of operation
principle for breath: microspore and
hydrophilic group. Breawarf breathable underlay membrane
adopt the principle of microspore. The
minimum diameter of water drop is
about 20 micron while the diameter of water vapour molecule is about 0.0004 micron, because of
the enormous difference, water vapour can get
across according to the dif fusibility,
while water molecule can't pass because of
the surface tension. As a
result, the breathable underlay membrane can prevent
osmotic water , so that to have the water
proof function. |
