Pall Corporation

Colin F Harwood

Peter J Degen

Thomas C Gsell

David B Pall

Isaak Vasserman

Arthur Bradley

John B Ronan

Raymond T Friel

Jason Mei

Timothy R Brennan

Stephen A Geibel

Carl H Meyers

Clemens C Von Reitzenstein

Ronald Spinelli, Jr

Frank A Fiumano

The present invention provides a method of preparing polyarylene sulfide fibers, particularly polyphenylene sulfide fibers, comprising melt blowing a blend of polyarylene sulfide and a polyolefin, wherein the polyolefin is present in the blend in an amount of up to about 40% by weight of the total blend. The present invention also provides fibers, webs, and other products prepared in accordance with the present inventive method.

Polyarylene sulfide resin composition

Polyarylene sulfide melt blown fibers and products

The present invention provides a filtration method comprising passing a protein-containing solution through a filtration medium comprising a polyamide-polyether copolymer, such as a polyamide/polyalkylene-oxide-diamine, particularly a nylon 6/polyethylene-oxide-diamine copolymer.

Method of filtering a protein-containing fluid

Polyarylene sulfide melt blowing methods and products

The present invention provides a method of preparing a support for a filtration medium comprising passing a sheet of nonwoven fibrous polymeric material having first and second sides through a calender which comprises a nondeformable roll and a resilient roll, the nondeformable roll being maintained at a temperature below the melting temperature of the material, so as to increase the smoothness of the first side of the material which contacted the resilient roll. A filtration medium support material prepared in accordance with the method of the present invention, as well as a filter comprising a filtration medium and that filtration medium support material, are also provided by the present invention.

Filtration mediam support material and filter comprising same

Bonded end capped tubular or cylindrical filter elements are formed by fusing a fibrous mass of non-woven, intertwining, mechanically entangled, synthetic polymeric, microfibers possessing a temperature of dimensional heat instability and end caps formed from a dynamic vulcanizate comprising ethylene-propylene-diene-monomer (EPDM) rubber particles dispersed in a polypropylene matrix wherein the fused end capped filter exhibits minimal fiber pull back.

End capped fibrous filter making

Method of preparing a support material for use with a filtration medium

The present invention provides a filtration medium comprising a fibrous mass of nonwoven polymethylpentene fibers. Moreover, a filter element comprising the aforesaid fibrous mass of nonwoven polymethylpentene fibers surrounding a perforated, hollow, cylindrical tube is also provided. The present invention further provides a filter cartridge which comprises a housing and the aforesaid filter element.

Polymethylpentene filtration medium

An element for treating a fluid flowing through the element which comprises at least two filter medium layers helically wrapped around a pervious, hollow tube, with the filter medium layers forming an overall graded pore structure for the fluid treatment element and/or at least one diffusion layer positioned between the filter medium layers.

Helical wrapped filter element

A bag filter comprising at least one sheet of a polyester filter medium, preferably a polyester high dirt capacity filter medium, having a graded pore structure which has been formed into a bag configuration with an opening, an inside surface, an outside surface, and at least one seam formed at adjoining filter medium portions which have been sewn together and optionally sealed with a thermoplastic tape that has been heat-sealed to the adjoining filter medium portions.

Polyester bag filter

Filter cartridge elements are provided with a spiral wrapping made from a thermoplastic polymer to give stability against inside-out flow and to protect the filtration medium. The spiral wrapping is attached to underlying turns of the wrap and to the surface of the filter cartridge by fusion bonding.

Spiral wrapped fluid treatment element

A fluid treatment element comprises a wrap spirally wound in successive overlapping windings about the external surface of a cartridge. The wrap has a portion contiguous to a portion of the external surface of the cartridge. A first adhesive is disposed between the external surface of the cartridge and the contiguous portion of the wrap. A second adhesive is disposed between overlapping windings of the wrap. An end cap is disposed over an end of the cartridge and is secured to the end of the cartridge and an end portion of the wrap. The fluid treatment element is applicable to various fields, including, for example, filtration, water demineralization, and gas treatment.

Fluid filter element with an overlapped wrap

Cylindrical fibrous structures comprising a fibrous mass of nonwoven, synthetic, polymeric microfibers wherein the microfibers are substantially free of fiber-to-fiber bonding and secured to each other by mechanical entanglement or intertwining, the fiber structure having a substantially constant voids volume over at least a substantial portion of the structure and, preferably, a graded fiber diameter structure, both as measured in the radial direction. The structures are particularly useful as depth filters.

Cylindrical fibrous structures with graded pore size

Cylindrical fibrous structures comprising a fibrous mass of nonwoven, synthetic, polymeric microfibers wherein the microfibers are substantially free of fiber-to-fiber bonding and secured to each other by mechanical entanglement of intertwining, the fiber structure having a substantially constant voids volume over at least a substantial portion of the structure and, preferably, a graded fiber diameter structure, both as measured in the radial direction. The structures are particularly useful as depth filters. The process for preparing such fibrous structures comprises the steps of:

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Glen Cove, NY, United States of America

Colin F Harwood