ES345591A1 - Dual pressure stock screen - Google Patents

Dual pressure stock screen

Info

Publication number
ES345591A1
ES345591A1 ES345591A ES345591A ES345591A1 ES 345591 A1 ES345591 A1 ES 345591A1 ES 345591 A ES345591 A ES 345591A ES 345591 A ES345591 A ES 345591A ES 345591 A1 ES345591 A1 ES 345591A1
Authority
ES
Spain
Prior art keywords
screens
trough
screen
reject
reject fraction
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.)
Expired
Application number
ES345591A
Other languages
Spanish (es)
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.)
Beloit Corp
Original Assignee
Beloit 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 claimed from US522638A external-priority patent/US3387708A/en
Application filed by Beloit Corp filed Critical Beloit Corp
Publication of ES345591A1 publication Critical patent/ES345591A1/en
Expired legal-status Critical Current

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
    • B01D29/15—Supported filter elements arranged for inward 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
    • 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
    • B01D29/54—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 arranged concentrically or coaxially
    • 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
    • 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
    • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
    • B01D29/90—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding
    • B01D29/908—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for feeding provoking a tangential stream
    • 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
    • B01D29/88—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices
    • B01D29/94—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging the filter cake, e.g. chutes
    • B01D29/945—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor having feed or discharge devices for discharging the filter cake, e.g. chutes for continuously discharging concentrated liquid
    • 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
    • D21D5/06—Rotary screen-drums

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)

Abstract

Slurry (e.g. paper stock) enters at 14, flows in a volute path into a chamber 15 surrounding concentric cylindrical screens 16, 20, flows in parallel inwardly through these screens into a trough 17 and out through a main outlet 27. One or more outlets (e.g. 31, 29, 24) are provided for the reject fraction. The screens are kept from clogging by rotating foils 35, 37 positioned adjacent their respective outer surfaces. As described, the densest reject fraction is collected in a trough 28 by virtue of the centrifugal force created by the tangential inlet flow. An intermediate reject fraction collects by gravity in a trough 30. The lightest reject fraction together with untreated slurry floats over the weir constituted by screen 16 and enters annular space 25, reject leaving at 33, slurry passing through screen 20. Collection trough 17 may be partitioned (100, Fig. 3, not shown) to collect accept from the two screens separately these screens may have different porosities. Each screen 16, 20 is supported by a grid 16a, 20a and backed by an impervious wall 16b, 20b, respectively. Dilution water may be introduced into chambers 15, 25 (Fig. 2, not shown). The foils 35, 37, which are circumferentially elongate in plan section, and may be connected by a ring 73, are rotated by a hub 64 mounted on a central shaft 50 driven by V-belts 90.
ES345591A 1966-01-24 1967-09-29 Dual pressure stock screen Expired ES345591A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US522638A US3387708A (en) 1966-01-24 1966-01-24 Paper machine screen
US583639A US3456793A (en) 1966-01-24 1966-10-03 Dual pressure stock screen

Publications (1)

Publication Number Publication Date
ES345591A1 true ES345591A1 (en) 1968-11-16

Family

ID=24333972

Family Applications (1)

Application Number Title Priority Date Filing Date
ES345591A Expired ES345591A1 (en) 1966-01-24 1967-09-29 Dual pressure stock screen

Country Status (5)

Country Link
US (1) US3456793A (en)
DE (1) DE1298868B (en)
ES (1) ES345591A1 (en)
FR (1) FR93277E (en)
GB (1) GB1188726A (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3642139A (en) * 1968-08-12 1972-02-15 Peter C Wilson Apparatus for centrifugally removing liquid from a mixture
DE2526657C3 (en) * 1975-06-14 1978-10-26 Hermann Finckh, Maschinenfabrik, 7417 Pfullingen Pressure sifter for fiber suspensions
US4017387A (en) * 1975-08-11 1977-04-12 The Black Clawson Company Screening apparatus
US4111799A (en) * 1977-07-07 1978-09-05 Beloit Corporation Stock screen foil
US4213823A (en) * 1979-04-26 1980-07-22 Beloit Corporation Paper making machine screen with staggered foils
DE3424919A1 (en) * 1984-07-06 1986-01-16 J.M. Voith Gmbh, 7920 Heidenheim METHOD FOR RECYCLING PAPER
FI81136C (en) * 1987-11-11 1990-09-10 Ahlstroem Oy Method and apparatus for treating pulp
FR2677265A1 (en) * 1991-06-06 1992-12-11 Beaudrey & Cie Filter with stationary strainer
DE4308225C1 (en) * 1993-03-16 1994-11-24 Escher Wyss Gmbh Process for sorting fiber suspension and screening device for carrying it out
DE102006008758A1 (en) * 2006-02-24 2007-08-30 Voith Patent Gmbh Rotor for a pressure sorter for fiber suspensions

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US591645A (en) * 1897-10-12 Pulp-screen
US1714047A (en) * 1929-05-21 And claude l
US1839941A (en) * 1927-03-29 1932-01-05 Zelezniak Wladyslaw Centrifugal separator
US2364171A (en) * 1940-07-08 1944-12-05 Black Clawson Co Pulp screen
GB779796A (en) * 1954-03-03 1957-07-24 Sunds Verkstaeder Aktiebolag Improvements in or relating to the treatment of liquid suspensions
US3092578A (en) * 1959-01-16 1963-06-04 Bird Machine Co Screening apparatus
FR1271054A (en) * 1960-01-22 1961-09-08 E Et M Lamort Fils Classifying apparatus for the purification by sieving of liquids containing suspended solid particles and in particular cellulose pulps
US3223239A (en) * 1962-05-11 1965-12-14 Bird Machine Co Pressure type screening devices
US3387708A (en) * 1966-01-24 1968-06-11 Beloit Corp Paper machine screen

Also Published As

Publication number Publication date
GB1188726A (en) 1970-04-22
DE1298868B (en) 1969-07-03
FR93277E (en) 1969-03-07
US3456793A (en) 1969-07-22

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