# US 2014/0360147 A1 · Filter element with high temperature polymer retaining straps and method of manufacture > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0360147 A1 - Document ID: US20140360147A1 - Status: Published application - Kind: A1 - Application number: 13/910,191 - Filed: 2013-06-05 - Published: 2014-12-11 - Earliest claimed: 2013-06-05 - Assignees: BHA Altair, LLC - Applicants: BHA Altair, LLC - Inventors: Cynthia Marie Polizzi; Vishal Bansal; Bryan David Yetter - Web page: https://patentgrep.com/patent/US20140360147A1 ## CPC - B01D 46/521: {using folded, pleated material} - B01D 46/2411: {Filter cartridges} - B01D 46/523: {with means for maintaining spacing between the pleats or folds} - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) ## Abstract A filter element includes a filtration media formed into a tubular configuration. The filtration media includes a plurality of circumferentially spaced apart pleats. The filter element includes at least one retaining strap extending circumferentially around the filtration media to limit movement of the filtration media The at least one retaining strap has a ratio of flow direction tensile modulus to perpendicular direction tensile modulus of 1.5 or less. A method of fabricating a filter element is also provided. ## Claims ### Claim 1 A filter element including: a filtration media formed into a tubular configuration and including a plurality of circumferentially spaced apart pleats; and at least one retaining strap extending circumferentially around the filtration media to limit movement of the filtration media, the at least one retaining strap having a ratio of flow direction tensile modulus to perpendicular direction tensile modulus of 1.5 or less. ### Claim 2 (depends on 1) The filter element of claim 1, wherein the ratio of flow direction tensile modulus to perpendicular direction tensile modulus is 1.2 or less. ### Claim 3 (depends on 1) The filter element of claim 1, wherein the ratio of flow direction tensile modulus to perpendicular direction tensile modulus is 1.15 or less. ### Claim 4 (depends on 1) The filter element of claim 1, wherein the at least one retaining strap includes at least one of a thermoplastic polyurethane, thermoplastic elastomer, polyphenylsulfone (PPSU), polysulfone (PSU), polyether block amide, and thermoplastic polyester elastomer. ### Claim 5 (depends on 1) The filter element of claim 1, wherein each of the plurality of pleats includes a first side and an opposing second side forming a tip portion. ### Claim 6 (depends on 5) The filter element of claim 5, wherein the at least one retaining strap is attached to the tip portions of the plurality of pleats. ### Claim 7 (depends on 5) The filter element of claim 5, wherein the at least one retaining strap is attached to at least one of the first side and the second side. ### Claim 8 (depends on 5) The filter element of claim 5, wherein the at least one retaining strap includes an extension portion that extends between adjacent pleats. ### Claim 9 (depends on 1) The filter element of claim 1, wherein a tensile modulus of the at least one retaining strap along a flow direction is less than 1500 megapascals (MPa). ### Claim 10 (depends on 9) The filter element of claim 9, wherein a tensile modulus of the at least one retaining strap perpendicular to a flow direction is less than 1300 megapascals (MPa). ### Claim 11 (depends on 1) The filter element of claim 1, wherein the at least one retaining strap includes a polymer extrudate that is extruded through an extrusion flow channel having a length to hydraulic diameter ratio of less than 6. ### Claim 12 (depends on 11) The filter element of claim 11, wherein the extrusion flow channel has a length to hydraulic diameter ratio of less than 5.5. ### Claim 13 (depends on 11) The filter element of claim 11, wherein the extrusion flow channel has a length to hydraulic diameter ratio of less than 5. ### Claim 14 A method of fabricating a filter element, the method including the steps of: providing a filtration media formed into a tubular configuration and including a plurality of circumferentially spaced apart pleats; extruding a polymer extrudate through an extrusion flow channel; and applying the polymer extrudate to extend circumferentially around a portion of the filtration media to form a retaining strap that extends circumferentially around the filtration media to limit movement of the filtration media, the retaining strap having a ratio of flow direction tensile modulus to perpendicular direction tensile modulus of 1.5 or less. ### Claim 15 (depends on 14) The method of claim 14, wherein the extrusion flow channel has a length to hydraulic diameter ratio of less than 6. ### Claim 16 (depends on 14) The method of claim 14, wherein the extrusion flow channel has a length to hydraulic diameter ratio of less than 5.5. ### Claim 17 (depends on 14) The method of claim 14, wherein the extrusion flow channel has a length to hydraulic diameter ratio of less than 5. ### Claim 18 (depends on 14) The method of claim 14, wherein the retaining strap has a ratio of flow direction tensile modulus to perpendicular direction tensile modulus of 1.2 or less. ### Claim 19 (depends on 14) The method of claim 14, wherein the retaining strap has a ratio of flow direction tensile modulus to perpendicular direction tensile modulus of 1.15 or less. ### Claim 20 (depends on 14) The method of claim 14, wherein the retaining strap includes one of a thermoplastic polyurethane, thermoplastic elastomer, polyphenylsulfone (PPSU), polysulfone (PSU), polyether block amide, and thermoplastic polyester elastomer