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.

主权项

1. A screen-type filter element, comprising:
a substantially rigid screen-bearing skeleton including a plurality of enveloping ribs, at least some of the plurality of enveloping ribs having portions comprising plastic material integrally formed with the plurality of enveloping ribs; and a filter screen assembly including:
at least one fine mesh screen sheet material layer including fine apertures; andat least one coarse mesh screen sheet material layer including coarse apertures;wherein the filter screen assembly is integrated with and attached to the substantially rigid screen-bearing skeleton through the portions comprising the plastic material of the plurality of enveloping ribs;wherein the portions comprising the plastic material of the plurality of enveloping ribs penetrate through only a selected portion of the coarse apertures of the at least one coarse mesh screen sheet material layer and cover only a selected portion of at least one face of the at least one fine mesh screen sheet material layer, such that at least one face of the at least one coarse mesh screen sheet material layer bears against the at least one face of the at least one fine mesh screen sheet material layer to thereby support the at least one fine mesh screen sheet material layer;wherein the substantially rigid screen-bearing skeleton is integrally formed with the at least one coarse mesh screen sheet material layer and bonded to the at least one fine mesh screen sheet material layer;wherein the plurality of enveloping ribs support the filter screen assembly at discrete portions and secure the filter screen assembly to the substantially rigid screen-bearing skeleton.