Web-form filter material, in particular filter paper for liquid filters or gas filters, having shaped-in beadings

摘要

In a web-form filter material, in particular filter paper for liquid filters or gas filters, having shaped-in beadings, in which the filter material is folded into individual sections in a zigzag shape, and in which these sections are kept at a distance from each other via the beadings, the stiffness and the strength of the beadings are to be increased in order to prevent loss of the spacer action of the beadings after relatively long operating times. For this purpose, the beadings are curved following a catenary.