Filter structure with enhanced dirt holding capacity

A filter layer, fiber filtration technology, applied in membrane filters, cartridge filters, fixed filter element filters, etc., can solve problems such as increase in filter volume

Inactive Publication Date: 2017-02-22
MILLIPORE CORP
View PDF6 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This increase in filter volume is considered a disadvantage since compactness is a desired property of filtration systems

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Filter structure with enhanced dirt holding capacity
  • Filter structure with enhanced dirt holding capacity
  • Filter structure with enhanced dirt holding capacity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] Example 1 provides exemplary procedures for preparing nylon solutions for electrospinning according to certain embodiments of the present invention.

[0087] Nylon 6 was supplied by BASF Corp., Florham Park, NJ, USA under the trademark Ultramid B24. Solutions of Nylon 6 were prepared in a mixture of two solvents, acetic acid and formic acid, present in a weight ratio of 2:1. To produce fibers with a diameter of approximately 120 nm, a solution of 11% by weight nylon 6 was prepared, to produce fibers with a diameter of approximately 160 nm, a solution of 12.4% by weight nylon 6 was prepared, and to produce fibers with a diameter of approximately 200 nm, a solution of 13.7% by weight was prepared. Solutions were prepared by vigorously stirring each mixture of solvent and polymer at 80 °C for 5 to 6 hours in a glass reactor. The solution was then cooled to room temperature.

[0088] In Example 1, a nylon nanofiber mat is made of nanofibers having two different fiber diam...

Embodiment 2

[0094] Example 2 further demonstrates the advantage of including a rough porous interlayer between two filter layers, wherein in addition to the mats containing fibers of approximately 120 nm and 200 nm in diameter of Example 1, an additional mat containing nanofibers, approximately 20 Micron thick, containing fibers approximately 160 nm in diameter. This additional pad containing nanofibers was placed between the pad containing 120 nm fibers and the pad containing 200 nm fibers.

[0095] figure 2 A first set of filtration devices is illustrated in which nanofiber-containing mats are layered directly on top of each other. For the second set of filter devices, a coarse polypropylene nonwoven layer with an approximate fiber diameter of about 5 μm to 10 μm was placed between the mat containing 120 nm fibers and the mat containing 160 nm fibers, and between the mat containing 160 nm fibers and the mat containing 200 nm fibers. between the pads. As in Example 1, all filter stru...

Embodiment 3

[0098] Example 3 also demonstrates the advantage of including a rough porous interlayer between two filter layers. The three nanofiber layers described in Example 2 were arranged such that an approximately 75 μm thick nylon nonwoven interlayer composed of fibers with a fiber diameter of approximately 15 μm to 20 μm was placed adjacent to the 160 nm nanofiber layer. In another variation, the nylon nonwoven interlayer is disposed only between the 160nm and 120nm nanofiber layers, and the 200nm nanofiber layer is disposed adjacent to the 160nm nanofiber layer.

[0099] The throughput capabilities of these two filtration structures were measured as described in Example 1, and were compared to those in which there was no nonwoven interlayer (i.e., three nanofiber layers adjacent to each other) and those containing nanofiber layers arranged at 160 nm and 120 nm. The filtering structures between are compared.

[0100] Figure 4 The composite media filter structure illustrating the ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
diameteraaaaaaaaaa
thicknessaaaaaaaaaa
diameteraaaaaaaaaa
Login to view more

Abstract

A fluid filtration device containing a composite filter media having a coarse porous polymeric nonwoven interlayer located between first and second polymeric fiber containing filter mats. The fiber diameters of the fibers in the first and second filter mats are different from each other, and each filter mat has a different pore size rating. The first and second polymeric fibers in the filter mats can be electrospun nanofibers. The interlayer has a coarser pore size when compared to the either the first or second filter mats, such that the resulting composite media has an increased dirt holding capacity compared to filter layers that are layered directly over each other without the presence of a coarse interlayer therebetween.

Description

[0001] This application claims priority to US Provisional Application Serial No. 62 / 017,463, filed June 26, 2014. technical field [0002] The present invention relates generally to fluid filtration devices, and more particularly to fluid filtration devices incorporating composite media filter structures, and methods of using and making such devices and structures. [0003] technical background [0004] Fluid filters designed to remove unwanted particles and contaminants are prone to clogging because the fluid path is progressively closed or restricted as particles and contaminants become trapped in the filter media. The capacity or service life of a filter is related to its ability to pass fluid at a rate above a minimum value, or to maintain a desired flow rate at a pressure below a maximum value. [0005] One way to increase the required dirt holding capacity or lifespan of the filter is to protect the end filter with a pre-filter with a coarser construction. A pre-filter...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B01D27/14B01D29/01B01D29/05B01D29/50B01D29/56
CPCB01D2239/0631B01D2239/065B01D39/1623B01D39/02B01D2239/0618B01D2239/025
Inventor S·吉利亚D·任S·阿什比利昂G·特卡奇克
Owner MILLIPORE CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap