Extrusion method and apparatus for manufacturing microporous film

The manufacturing microporous membrane method and device. The method for casting surface (14) and condenses the surface (18). Condenses the surface (18) and casting surface (18) large distance, form a gap. A gap distance between two surfaces is small, wherein is less than 3 cm. The separated to form the microporous membrane by thermal the material casting to the casting surface (14); preferably extrusion method via a convention. The material comprises at least a evaporating component; the horizontal component when forming the microporous membrane the flash evaporation sunken; and temperature in the condensation surface (14) is.