WO2001007872A3 - Pressure screening device - Google Patents

Pressure screening device Download PDF

Info

Publication number
WO2001007872A3
WO2001007872A3 PCT/US2000/019723 US0019723W WO0107872A3 WO 2001007872 A3 WO2001007872 A3 WO 2001007872A3 US 0019723 W US0019723 W US 0019723W WO 0107872 A3 WO0107872 A3 WO 0107872A3
Authority
WO
WIPO (PCT)
Prior art keywords
cylindric
screens
screen
smaller
screening
Prior art date
Application number
PCT/US2000/019723
Other languages
French (fr)
Other versions
WO2001007872A2 (en
Inventor
Frey Frejborg
Original Assignee
Cae Screen Plates Inc
Frey Frejborg
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
Application filed by Cae Screen Plates Inc, Frey Frejborg filed Critical Cae Screen Plates Inc
Priority to AU61131/00A priority Critical patent/AU6113100A/en
Publication of WO2001007872A2 publication Critical patent/WO2001007872A2/en
Publication of WO2001007872A3 publication Critical patent/WO2001007872A3/en

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/023—Stationary screen-drums
    • D21D5/026—Stationary screen-drums with rotating cleaning foils
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/23—Supported filter elements arranged for outward flow filtration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
    • B01D29/13—Supported filter elements
    • B01D29/23—Supported filter elements arranged for outward flow filtration
    • B01D29/25—Supported filter elements arranged for outward flow filtration open-ended the arrival of the mixture to be filtered and the discharge of the concentrated mixture are situated on both opposite sides of the filtering element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
    • B01D29/52—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in parallel connection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/76—Handling the filter cake in the filter for purposes other than for regenerating
    • B01D29/86—Retarding cake deposition on the filter during the filtration period, e.g. using stirrers

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

A pressure screen is disclosed for use in screening pulp suspension, utilizing the principle of a cylindric screen provided with a pulse generating device such as hydrofoils (34). As is usual, the screen has a cylindric housing (12) but instead of a single cylindric screen arrangement concentric with the axis of the chamber, it has at least three smaller cylindric screens (16, 17, 18, and 19) disposed about the axis (22) of the housing. The invention provides a significant improvement over known pressure screens in that it substantially increases the screening area while not requiring enlargement of space required for the cylindric housing. The high capacity is provided by smaller size screens which are easier to manufacture, have better strength properties compared to large cylindric screens and are less expensive to replace. The increased area of screening can be utilized by provided smaller apertures in the screens while maintaining the same overall output of the screen despite the lower capacity per area unit caused by smaller passages. This results in a significant improvement of the quality of the accepts.
PCT/US2000/019723 1999-07-26 2000-07-17 Pressure screening device WO2001007872A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU61131/00A AU6113100A (en) 1999-07-26 2000-07-17 Pressure screening device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US36067499A 1999-07-26 1999-07-26
US09/360,674 1999-07-26

Publications (2)

Publication Number Publication Date
WO2001007872A2 WO2001007872A2 (en) 2001-02-01
WO2001007872A3 true WO2001007872A3 (en) 2001-09-07

Family

ID=23418983

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/019723 WO2001007872A2 (en) 1999-07-26 2000-07-17 Pressure screening device

Country Status (3)

Country Link
AU (1) AU6113100A (en)
TW (1) TW475021B (en)
WO (1) WO2001007872A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070170104A1 (en) * 2006-01-23 2007-07-26 James-Wallace Belford Filtration systems and filtration tanks for use therein

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5201423A (en) * 1990-11-22 1993-04-13 J. M. Voith Gmbh Fiber suspensions sorter having a plurality of screen baskets
DE4237151A1 (en) * 1992-11-04 1993-05-19 Voith Gmbh J M Paper suspension sieve assembly - has drum rotors within sieve bodies contained in a cylindrical housing
US5679250A (en) * 1993-02-10 1997-10-21 Sunds Defibrator Industries Aktiebolag Pressurized screen arrangement
US5960962A (en) * 1996-02-19 1999-10-05 Ahlstrom Machinery Oy Screen
US6029821A (en) * 1995-09-25 2000-02-29 Heinrich Fiedler Gmbh & Co. Kg Screening device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5201423A (en) * 1990-11-22 1993-04-13 J. M. Voith Gmbh Fiber suspensions sorter having a plurality of screen baskets
DE4237151A1 (en) * 1992-11-04 1993-05-19 Voith Gmbh J M Paper suspension sieve assembly - has drum rotors within sieve bodies contained in a cylindrical housing
US5679250A (en) * 1993-02-10 1997-10-21 Sunds Defibrator Industries Aktiebolag Pressurized screen arrangement
US6029821A (en) * 1995-09-25 2000-02-29 Heinrich Fiedler Gmbh & Co. Kg Screening device
US5960962A (en) * 1996-02-19 1999-10-05 Ahlstrom Machinery Oy Screen

Also Published As

Publication number Publication date
WO2001007872A2 (en) 2001-02-01
AU6113100A (en) 2001-02-13
TW475021B (en) 2002-02-01

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