FILTER ELEMENT FOR CLEANING INLET AIR OF INTERNAL COMBUSTION ENGINE AND PROCESS FOR PREPARING THE SAME

摘要

The present invention relates to a filter material for cleaning cleaning inlet air of internal combustion engine from contaminants which has an elongated lifetime, and a process for preparing the same. More particularly, it relates to a dual- or multi-layer filter material with a density gradient comprising at least one ultra-fine meltblown non-woven fabric layer with a density gradient located on the air-inlet side and a filter paper layer or a meltblown layer comprising two or more components having different melting points as a final layer located on the air-outlet side, and a process for preparing the same. The filter material for air cleaning according to the present invention can improve the problems of low service lifetime (dust capturing amount) which was involved in the prior art filter material containing the filter paper only, and can improve the efficiency which was the drawback in the prior art non-woven fabric filter material. Therefore, the filter material can be used as a filter medium in the field of recent internal combustion engine, etc. since it is excellent in capturing carbons by using ultra-fine meltblown.