luftfiltermedium, processes for the manufacture of a filtermediums, luftfilterpackung for air filter and luftfiltereinheit for air filter

摘要

An air filter medium is provided with a porous film made from a polytetrafluoroethylene, and a non-woven fabric laminated on at least one side of the porous film. The non-woven fabric has an apparent density satisfying the following equation: apparent density (g/cm3) 1.5 x (basis weight (g/m2)/1000) + 0.11. The filter medium is produced by a process that includes a first step of producing a porous film formed from a polytetrafluoroethylene, and a second step of laminating a non-woven fabric on at least one side of the porous film on heating roll that has undergone a non-adhesive treatment. The filter medium is used to manufacture an air filter pack, while the air filter pack is used to manufacture an air filter unit.