Based on the analysis of the ambient particulate concentration in the air when the foggy yarn occurs in the cotton mill,the paper makes experimental researchs on some electret filtration fabrics′ purifying performances.

The original study of mostly appraising target about electret air filtration material;

According to ecumenic air filtration material appraised quality criterion and the characters of electret air filtration material, this paper discusses the qppraising criterion of the electret air filtration material.

Research progress of the numerical simulation technology of gas-solid flow in electret air filter;

The paper discussed a series of experimen ts that the application of nano-sized photocatalysis material in the filed of a ir filter material′s denaturation treatments,in according to functionality air filter material′s special demand.