Screen-type filter element including filter assembly with fine and coarse mesh screen sheet material layers selectively penetrated by integrally attached plastic enveloping ribs

摘要

The disclosed subject matter is concerned with a screen-type filter element, and a method for its manufacture. The screen type filter comprises a substantially rigid screen-bearing skeleton and at least one fine screen sheet material extending within or over the skeleton and secured thereto by a plurality of enveloping ribs, the enveloping ribs being applied over one face of the filter screen sheet to thereby support it at discrete portions and secure it to the skeleton.