FELT MATERIAL FOR AIR FILTER

摘要

A felt material for air filters is provided which is reduced in pressure loss and has high collecting performance. When attached to a dust collector, waste gas treatment apparatus, etc., the felt material can efficiently remove fine soot/dust particles from a high-temperature dust-containing gas. The felt material is a nonwoven structure obtained by uniting by needle punching a carded lap comprising first fibers which are fibrillated flame-retardant organic fibers and supplementary fibers selected from the group consisting of second fibers which are flame-retardant organic fibers having a heat fusion temperature of 250°C or higher or having no melting point and third fibers which are inorganic fibers having high heat resistance. The nonwoven structure is heat-treated to thereby regulate the thickness and density thereof to given values.