Cleanable filter medium

Abstract

Cleanable filter media and filters are provided that are formed from extruded reticular materials, such as nettings, meshes, mattings, apertured films, apertured sheets and the like. A cleanable filter media comprises a first layer comprising an extruded reticular structure and a second layer in contact with the first layer and comprising an extruded reticular structure. The first and second layers may include holes, perforations or apertures that are misaligned with each other. The reticular structures may comprise an apertured polymer film or a netting. One or more of the layers may be electrically charged and/or may comprise charge additives or charge control agents. One or more of the layers may include a silicon-based coating. The cleanable filter media are less expensive to manufacture than conventional cleanable filter media and may have equivalent or improved performance characteristics.

Dependencies are inferred from the claim text.