Filter material for bag filter air purification filters

摘要

The invention relates to a device in air filter cartridges of so-called bag filter type. By means of making recesses (15) in the short sides of the respective filter blanks, before sewing, a seam line/supporting line (17) is obtained which is lower than the corner side portions (18) of the filter blank (16). In this way, the pressure/tensile load may be distributed over the entire area at the entrance of the air filter cartridge by means of a wire grating inserted in the cartridge frame.