FR2282287A1 - Two part filter medium - giving much reduced rate of increase of pressure drop per unit area - Google Patents

Two part filter medium - giving much reduced rate of increase of pressure drop per unit area

Info

Publication number
FR2282287A1
FR2282287A1 FR7525497A FR7525497A FR2282287A1 FR 2282287 A1 FR2282287 A1 FR 2282287A1 FR 7525497 A FR7525497 A FR 7525497A FR 7525497 A FR7525497 A FR 7525497A FR 2282287 A1 FR2282287 A1 FR 2282287A1
Authority
FR
France
Prior art keywords
pressure drop
filter medium
increase
unit area
per unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
FR7525497A
Other languages
French (fr)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GAF Corp
Original Assignee
GAF Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US49891474A priority Critical
Application filed by GAF Corp filed Critical GAF Corp
Publication of FR2282287A1 publication Critical patent/FR2282287A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D39/00Filtering material for liquid or gaseous fluids
    • B01D39/14Other self-supporting filtering material ; Other filtering material
    • B01D39/16Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres
    • B01D39/1607Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous
    • B01D39/1623Other self-supporting filtering material ; Other filtering material of organic material, e.g. synthetic fibres the material being fibrous of synthetic origin
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D39/00Filtering material for liquid or gaseous fluids
    • B01D39/08Filter cloth, i.e. woven, knitted or interlaced material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2239/00Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065More than one layer present in the filtering material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2239/00Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065More than one layer present in the filtering material
    • B01D2239/0654Support layers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2239/00Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/12Special parameters characterising the filtering material
    • B01D2239/1233Fibre diameter
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2239/00Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/12Special parameters characterising the filtering material
    • B01D2239/1291Other parameters

Abstract

The rate of increase of pressure drop across a filter medium is reduced so that more liquid can be filtered before the filter is cleaned, by using a basic filter medium made of fibres of a fixed dia. woven into a felt of known pore dia., thickness end density. An unwoven mat of fibre is formed upstream of the basic medium an in contact with it. The fibres have the same dia. as those in the basic medium within plus-or-minus 40%. The mat is at least ten times thicker than the basic medium and its density is at least ten times less. Used in filtering liquid-solid mixtures. The amount of liquid filtered over a unit area before the pressure drop becomes excessive is increased about 100%.
FR7525497A 1974-08-20 1975-08-18 Two part filter medium - giving much reduced rate of increase of pressure drop per unit area Withdrawn FR2282287A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US49891474A true 1974-08-20 1974-08-20

Publications (1)

Publication Number Publication Date
FR2282287A1 true FR2282287A1 (en) 1976-03-19

Family

ID=23983019

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7525497A Withdrawn FR2282287A1 (en) 1974-08-20 1975-08-18 Two part filter medium - giving much reduced rate of increase of pressure drop per unit area

Country Status (6)

Country Link
JP (1) JPS5142168A (en)
AU (1) AU8311675A (en)
DE (1) DE2537104A1 (en)
FR (1) FR2282287A1 (en)
IT (1) IT1040121B (en)
NL (1) NL7509875A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0055112A1 (en) * 1980-12-19 1982-06-30 E.I. Du Pont De Nemours And Company Felt-like layered composite of PTFE and glass paper
EP0432586A2 (en) * 1989-12-06 1991-06-19 Hoechst Aktiengesellschaft Non-woven bi-layer material, specially with long-term filter properties, and process for its manufacture

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54124370A (en) * 1978-03-22 1979-09-27 Toray Ind Inc High-strength unwoven filter cloth and its manufacturing method
DE2927287B2 (en) * 1979-07-06 1981-05-21 HELSA - Werke Helmut Sandler & Co, 8586 Gefrees Multi-layer filter material with at least one layer of open-cell foam
JPS6418423A (en) * 1987-07-15 1989-01-23 Piyuaron Japan Kk Micro-filter for use in filtering air
JPH0746332Y2 (en) * 1990-01-31 1995-10-25 株式会社土屋製作所 Filter element
DE19702705A1 (en) * 1997-01-25 1998-07-30 Erhard Wendlandt Ultra-filtration for potable water

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0055112A1 (en) * 1980-12-19 1982-06-30 E.I. Du Pont De Nemours And Company Felt-like layered composite of PTFE and glass paper
EP0432586A2 (en) * 1989-12-06 1991-06-19 Hoechst Aktiengesellschaft Non-woven bi-layer material, specially with long-term filter properties, and process for its manufacture
EP0432586A3 (en) * 1989-12-06 1991-07-17 Hoechst Aktiengesellschaft Non-woven bi- or multi-layer material, specially with long-term filter properties, and process for its manufacture

Also Published As

Publication number Publication date
AU8311675A (en) 1977-01-20
IT1040121B (en) 1979-12-20
DE2537104A1 (en) 1976-03-11
JPS5142168A (en) 1976-04-09
NL7509875A (en) 1976-02-24

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Legal Events

Date Code Title Description
ST Notification of lapse