AIR FILTER AND PRODUCTION METHOD THEREFOR

摘要

An air filter comprising a laminate of a non-woven fabric made up of polyolefin fibers or polyester fibers or a composite of the non-woven fabrics and a PTFE porous film, wherein the amount of the total gases generated from the air filter is 20 mug/g by the analysis of gas chromatography. The amount of the gases generated from the air filter is greatly reduced by heat-treating the non-woven fabric at a temperature of from 80 to 130° C. for 5 minutes to 20 minutes before or after laminating with the PTFE porous film.