Filter cartridges with pleated filter media
First Claim
1. A filter cartridge having a multilayer pleated filter media comprised of a filter membrane layer, and at least one support layer for the filter membrane layer, wherein said at least one support layer is an expanded polymeric film mesh.
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Accused Products
Abstract
Filter cartridges include a pleated multi-layer filter media having a filtration membrane layer, and a structural support layer for the membrane layer which is in the form of an expanded polymeric film mesh. Most preferably, the membrane layer and the expanded polymeric film support layer are each formed of a fluoropolymer, most preferably PTFE. The preferred expanded polymeric film support layer is in the form of a relatively open mesh structure having generally diamond-shaped apertures. Improved flow rate characteristics through pleated filter media ensue when the diamond-shaped apertures of the mesh are oriented such that the long dimensions (LD) thereof are substantially transverse to the elongate pleat axis of the pleated filter medium in which the mesh is employed.
17 Citations
20 Claims
- 1. A filter cartridge having a multilayer pleated filter media comprised of a filter membrane layer, and at least one support layer for the filter membrane layer, wherein said at least one support layer is an expanded polymeric film mesh.
- 7. A filter cartridge comprising concentrically disposed slotted core and cage members, and a multilayer pleated filter media positioned in an annular space established between said core and cage members, wherein said filter media includes an inner filter membrane layer sandwiched between a pair of support layers for the filter membrane layer, wherein each said support layer is an expanded polymeric film mesh.
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16. A generally cylindrical filter cartridge comprising:
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an inner core member, an outer cage member concentrically positioned around said inner core member so as to establish an annular space therebetween, and multilayer pleated filter media positioned in said annular space established between said core and cage members, wherein said filter media includes a filter membrane layer and at least one expanded polymeric film mesh as a support layer for the filter membrane layer;
whereinpleats of the multilayer pleated filter media have elongate pleat axes disposed substantially parallel to a central longitudinal axis of the filter cartridge, and wherein said expanded polymeric film mesh is formed of a dense plurality of generally diamond-shaped apertures having respective long and short dimensions; and
wherein said expanded polymeric film mesh is disposed such thatsaid long dimensions of said diamond-shaped apertures thereof are oriented substantially transverse to said elongate pleat axes of the pleated filter media.
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Specification