Pore Structure And Air Permeability Of Nonwoven Filter Materials

Filtration is a dynamic process of separating and capturing particulate matter dispersed in gas or liquid. The Filter Cloth Material should have a large inner surface and appropriate pores to make it capable of capturing and adsorbing solid particles and separating them from the mixture. The pore structure of the filter material ( pore size and its distribution, porosity, etc. ) requires that it can not only block or adsorb microparticles, but also maintain a certain flux to allow the fluid to pass through smoothly. The three - dimensional network - like Nonwoven Fabric material composed of single fibers has become a kind of filter material with its unique multi - directional three - dimensional micro - curved channels and high porosity structure.

The pore structure of Non Woven Fabric includes pore size and its distribution, porosity. The gas permeability of a material is characterized by the volume of gas passing through a unit area per unit time. When the material porosity is comparable, its air permeability will increase with the increase of the average pore size of the material. When the average pore size of the material is comparable, air permeability increases with increasing porosity.
The pore size of the material depends to some extent on the thickness of the material and the linear density of the fibers. For materials with the same fiber type and linear density, the thicker the thickness, the higher the fiber coverage, and the smaller the average pore size. And the fiber linear density, the finer the fiber, the higher the fiber coverage under the same thickness, and the smaller the average pore size of the material.