초록 ▼

A pleated filter cartridge for filtering liquids including an annular filter element having a filter material which is a thin non-perforated non-woven material of flash-spun plexifilamentary high-density polyethylene fibrils, the filter material having a pressure drop of less than 4 psid at a flow r

A pleated filter cartridge for filtering liquids including an annular filter element having a filter material which is a thin non-perforated non-woven material of flash-spun plexifilamentary high-density polyethylene fibrils, the filter material having a pressure drop of less than 4 psid at a flow rate of 10 gal/hr and a filtration efficiency of at least 98% of 1?2 micron particulates at a pressure differential of 30 psid. The filter material preferably has a mean flow pore size greater than 4 microns while its normal pore-size filtration rating is 1 micron, and preferably has a thickness of less than about 0.15 mm, most preferably less than or equal to about 0.13 mm. The filter element preferably has two layers, including a mesh layer, preferably of a low-density polyethylene. The mesh most preferably has a softening temperature range below the lower end of the softening temperature range of the high-density polyethylene filter material, and is tack-point interconnected to the filter material without having compromised the filter material.

대표청구항 ▼

1. A pleated filter cartridge for removing particulates from liquid, the pleated filter cartridge being of the type including a perforate core, a pair of endcaps, and an annular filter element around the core formed by substantially axially-parallel pleats of of non-woven filter material, the filter

1. A pleated filter cartridge for removing particulates from liquid, the pleated filter cartridge being of the type including a perforate core, a pair of endcaps, and an annular filter element around the core formed by substantially axially-parallel pleats of of non-woven filter material, the filter element having opposite ends each in sealing engagement with one of the endcaps, characterized in that the filter element consists of a single layer of the filter material and a mesh layer, the single-layer filter material being a non-perforated non-woven material of flash-spun plexifilamentary high-density polyethylene fibrils, the filter material having a thickness of less than about 0.15 mm, a pressure drop of less than 4 psid at a flow rate of 10 gal/hr, and a filtration efficiency of at least 98% of 1?2 micron particulates at a pressure differential of 30 psid.2. The pleated filter cartridge of claim 1 wherein the filter material has a pressure drop of less than about 1.5 psid at a flow rate of 10 gal/hr and the filtration efficiency is at least about 99% of 1?2 micron particulates at a pressure differential of 30 psid.3. The pleated filter cartridge of claim 2 wherein the mean flow pore size of the filter material is greater than 4 microns while its nominal pore-size filtration rating is 1 micron.4. The pleated filter cartridge of claim 2 wherein the filter material has a Gurley Hill porosity rating no greater than about 5 sec/100 cc.5. The pleated filter cartridge of claim 1 wherein the filter material has a thickness less than or equal to about 0.13 mm.6. The pleated filter cartridge of claim 1 wherein the filter material has a basis weight of less than about 45 g/m2.7. The pleated filter cartridge of claim 6 wherein the filter material has a thickness less than or equal to about 0.13 mm.8. The pleated filter cartridge of claim 1 wherein the mesh layer is between the filter material and the core.9. The pleated filter cartridge of claim 1 wherein the mesh layer is a low-density polyethylene.10. The pleated filter cartridge of claim 9 wherein:the high-density polyethylene filter material has a softening temperature range;the polyethylene mesh has a softening temperature range lower than the lower end of the softening temperature range of the high-density polyethylene filter material; andthe polyethylene mesh is tack-point interconnected to the filter material without having compromised the filter material.11. The pleated filter cartridge of claim 10 wherein the mesh layer and filter material were tack-point interconnected prior to pleating.12. The pleated filter cartridge of claim 10 wherein the softening temperature range of the polyethylene mesh is within the range of 170?195° F.13. The pleated filter cartridge of claim 1 further including a containment sleeve of polyethylene netting enclosing the annular filter element.14. The pleated filter cartridge of claim 13 wherein the core and the endcaps are of polyethylene.