Filtering screens and methods of production thereof

Details Filtering screens and methods of production thereof Filtering screens and methods of production thereof

B - Operations, Transporting

01

D

182/105, 209/124

B01D 35/30 (2006.01) B01D 29/01 (2006.01) B01D 39/10 (2006.01) B01D 39/12 (2006.01) B07B 1/46 (2006.01) B07B 1/48 (2006.01) B07B 1/50 (2006.01)

Patent

CA 1274189

ABSTRACT A filtering screen is described comprising: a first filter mesh, a second filter mesh having a different mesh size from the first and overlying the first mesh, and an apertured support to which both of the meshes are bonded so as to maintain the two meshes in tension, the tension in one of the meshes being greater than that in the other. At least one other filter mesh may be bonded over the first two meshes. The support may comprise a plate of fibre reinforced material having apertures formed therein which are much greater in area than the openings in the filter mesh, or a sheet of metal in which apertures are formed and in which edge regions of each aperture are turned through aproximately 90° to extend normal to the plane of the sheet from the underside thereof to increase the rigidity of the sheet. In a second form of screen there is provided a frame, a first screen cloth of relatively coarse mesh adhesively secured at marginal edge portions around said frame, a second screen cloth having a relatively finer mesh than the first screen cloth and also adhesively secured at marginal edge portions around said frame, a third screen cloth superimposed on the second cloth and having a mesh which is relatively finer than the mesh of the second cloth, the third cloth also being adhesively secured at marginal edge portions around said frame, at least the first said screen cloth being tensioned and the second and third screen cloths being capable of vibrating so as to strike each other and the first mentioned screen cloth to dislodge particles which would otherwise clog the screen as the frame is vibrated.

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