US3581903A - Separator for paper pulp suspensions - Google Patents

Separator for paper pulp suspensions Download PDF

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Publication number
US3581903A
US3581903A US682717A US3581903DA US3581903A US 3581903 A US3581903 A US 3581903A US 682717 A US682717 A US 682717A US 3581903D A US3581903D A US 3581903DA US 3581903 A US3581903 A US 3581903A
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United States
Prior art keywords
screen
separator
pressure
chamber
slit
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Expired - Lifetime
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US682717A
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English (en)
Inventor
Emil Holz
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.)
Finckh Hermann Metalltuch und Maschinenfabrik
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Finckh Hermann Metalltuch und Maschinenfabrik
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Classifications

    • 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
    • B01D29/114—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 arranged for inward flow filtration
    • B01D29/115—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 arranged for inward 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
    • B01D29/11—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
    • B01D29/31—Self-supporting filtering elements
    • B01D29/33—Self-supporting filtering 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
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
    • B01D29/666—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps by a stirrer placed on the filtrate side 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
    • B01D29/76—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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/18—Filters characterised by the openings or pores
    • B01D2201/184—Special form, dimension of the openings, pores of the filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/28—Position of the filtering element
    • B01D2201/287—Filtering elements with a vertical or inclined rotation or symmetry axis

Definitions

  • A. Granger Att0meyWalter Becker ABSTRACT Separator for paper pulp suspension in which the apparatus has a pressurized housing with a cylindrical screen dividing said housing into an annular outer chamber which encircles a cylindrical inner chamber into which latter by pressure means, including a pump, pulp is forced through said screen and thence out of said housing, said screen being free of round holes capable of passing large round or cubical fiber bundles and comprising a multiplicity of narrow elongated slitlike apertures in the upstream face thereof, each connecting with a wider elongated groove in the downstream face of said screen, the slits passing only thin, small fibers or particles and the apertures combining with the back pressure of foils rotating against the downstream face of the screen, with the venturi shape of the apertures and with the forward pressure of pump to successively create alternate outward jets and inward flow in said slits to free any particles jammed therein by said pumping pressure.
  • the present invention relates to a separator for paper pulp suspensions.
  • Separators for separating or sorting paper pulp suspensions are known according to which the separator has a stationary perforated basket or perforated strainer which is provided with perforations widening in the direction toward the sorted suspension.
  • FIG. 1 is a side view, partly in section, of a separator accord ing to the present invention
  • FIG. 2 is a cross section through the separator of FIG. 1, and is indicated by line II-II of FIG. 1;
  • FIG. 3 is a fragmentary plan sectional view of a portion of the perforated basket and drawn at greatly enlarged scale
  • FIG. 4 is .a view drawn at the same scale as FIG. 3, and looking in at FIG. 3 in the direction of the arrow A.
  • the present invention concerns a separator for paper pulp suspensions with a stationary screen basket provided with perforations widening in the direction toward the sorted-out suspension, and is characterized in that the said perforations are designed as longitudinal slots while agitating blades rotate along that surface of said basket which faces the sorted-out suspension.
  • the separator shown in FIGS. 1 and 2 comprises a supporting base portion 10 and a cylindrical main frame or housing portion 11.
  • Main frame portion 11 has a flange lllc by means of which it rests on base portion I0 and is connected thereto in any convenient manner, for instance by bolts.
  • the upper end of main frame portion 11 is provided with a flange lllb to which is connected a cover 16 for closing the upper end of main frame portion 11.
  • the separator according to the invention is, in a manner known per se, provided with means, such as an eye bolt, for facilitating the lifting of cover 16 off the main frame portion 1 1.
  • main frame portion 11 Arranged within the interior of main frame portion 11 is a tubular, preferably cylindrical, perforated basket or screen 12 having its ends provided with reinforcing rings 21 and 22 for supporting and centering the basket 12 in the main frame portion 111.
  • Frame or housing portion 11 has connected thereto an inlet pipe 11g which leads into an annular chamber D confined inside of main frame portion 11, inwardly extending flange 1 1c of main frame portion 11, screen 12, and reinforcing ring 2].
  • Flange llle has that surface thereof which faces chamber D designed as an annular trough from which suspension can be drained through a pipe connection 11h (FIG. 2).
  • Flange llle confines an opening 111' through which the inner chamber E confined by screen 12 and cover 16 communicates with the receiving space lobformed by the base portion 10 of the separator.
  • Space 10b has an outlet 10a for withdrawing the suspension from the said space.
  • a bearing 23 Arranged in space 10b of base portion 10 is a bearing 23 which supports a vertical shaft 24. Shaft 24 extends outwardly to beneath space 10b and has connected thereto a pulley 25 over which passes a belt 26 to a pulley 27 connected to the shaft of an electric motor 28. Motor 28 is flanged to the base 10 of the separator.
  • the outer ends of said arms carry cleaning blades or foil 14 and 15 which act as agitators and which rotate with shaft 24 in the direction of the arrow C in FIG. 2.
  • the blades 14 and 15 are so arranged with regard to screen 12 that they pass rather closely along the inner side of screen 12.
  • said blades or vanes 14 and 15 are inclined in such a way (see FIGS. 2 and 3) that in response to their rotation in the direction of arrow C, they produce a pressure wave in the direction toward the screen.
  • This pressure wave brings about a back scavenging or rinsing flow in a direction opposite to the direction of flow of the suspension from chamber D through screen 12 into chamber E, and thereby causes a cleaning of the perforations 12a, 12b (FIG. 3) of screen 12.
  • Perforations 12a, 12b are shown on a considerably enlarged scale in FIGS. 3 and 4.
  • the said perforations are formed by relatively long and narrow slits at their upstream ends and flaring portions 12b leading to enlarged downstream ends.
  • the slot portion 12a is located as a slit in that surface of screen 12 which faces the interior of chamber D, and the portions 12b flare from portions 112a toward that surface of screen 12 which faces the interior of chamber E.
  • the said flaring portions 12b have at their wider mouth the contour of a ship, so that the flaring portion 12b resembles in shape the outer surface of a ship hull with the slot portion 120 forming the keel thereto.
  • the perforations in screen 12 may have a width of 0.4 millimeters and a length of 60 millimeters These perforations are arranged in a plurality of rows one above the other With a screen of the just-mentioned dimensions and perforations, the mouth of portions 12a as located in that surface of screen 12 which faces chamber E may be 2.5 millimeters wide.
  • perforations 12a. 12b extend in vertical direction as shown in FIG. 4, but they may also extend in a different direction, for instance, in the transverse direction or in a direction inclined to the vertical axis of screen 12.
  • suspension to be separated is supplied to inlet 11g under pressure to chamber D and passes radially inwardly through perforated basket or screen 12 to chamber E and then to outlet a. Separated out material is conveyed from groove lle via conduit 11h to discharge.
  • Blades 14 and 15 rotate, as shown in FIG. 2, and agitate the suspension as it is received in chamber E but. in particular, set up a backwash movement of suspension through the openings in basket 12 as each blade passes by a respective opening. This backwash movement dislodges any accumulations at the upstream end of the opening and these accumulations move to the groove lle and are eventually withdrawn from the separator via conduit 11h.
  • the openings are kept open for the passage of suspension therethrough and can thus be made small enough to yield the high quality suspension needed for fine papers while the separator still maintains a throughput large enough to represent an economically sound operation.
  • the basket had holes, round in cross section and widening in the direction of suspension flow therethrough and an agitating mechanism having blades as disclosed in the present application was disposed at the upstream ends of the holes in the basket.
  • System lb was the same as system la except the agitator was disposed at the downstream ends of the holes in the basket.
  • Yield G representing the efficiency of the separator with respect to throughput of pulp is arrived at by dividing the sorted pulp by the total pulp and multiplying by 100. This gives a percentage value. Both pulps are calculated as absolutely dry so the moisture content thereofdoes not influence the result.
  • System lb represents an improvement in both throughput and dirt and deposit reduction but also would not produce a high quality pulp.
  • System Ila having slots shows a material improvement in the removal of dirt and deposits but has reduced throughput. It appears that some obstruction of the slots occurs in system Ila which reduces the throughput while, at the same time also retards the movement of dirt and deposits through the slots.
  • the perforations 12a, 12b are somewhat of the venturi type, with the flaring portion 12b constituting a relatively wide, elongated, tapered groove terminating at its small end in the relatively narrow, elongated, parallel walled slot 12a, the latter forming a constricted throat.
  • the influent pressure of the pump P forcing the pulp forwardly through the line slots 12a for screening, is intermittently counteracted, or overcome, by the back pressure created by the foils 14 and 15, the back pressure exerted in the tapered groove 12b is reduced with a corresponding increase in velocity in a rearward direction back through slots 12a.
  • each of the perforations in said screen comprising a slot hav ing a narrow elongated slit in the outer upstream face of said screen and a wide, elongated, outwardly tapered groove connecting with and bordering the sides of said slit on the inner downstream face of said screen, and a plurality of forwardly rotating vanes extending along the downstream face of said screen with the surface of each vane adjacent said screen decreasing in distance from said screen from its leading edge rearwardly, so that the surfaces of each blade and the screen converge from said leading edge and create pressure outwardly through said perforations to clear said slits.
  • a separator for paper pulp suspensions of the type having a pressurized housing with an upstanding perforated cylindrical screen dividing said housing into an annular outer chamber encircling a cylindrical inner chamber, pressure means for feeding said suspension under pressure into and around said annular outer chamber, through said screen from the outer face to the inner face thereof, and thence out of said inner chamber, said screen having a multiplicity of identical separator slots forming the perforations in said screen, each slot having a fine, narrow, elongated slit in the outer face of said screen widening into a coarse, wide, elongated groove on the inner face of said screen having its sides diverging from said slit, said slits being adapted to bar round or cubical particles wider than said slits, but to pass narrow particles such as fibers through said slots, and a plurality of forwardly rotating foil-shaped vanes extending along the inner face of said screen, each of said vanes having a curved surface adjacent said screen which curves toward said screen from its leading edge to decrease the distance
  • a paper stock separator having an annular, influent, pressure chamber separated from a cylindrical, effluent pressure chamber by an upstanding, perforated, cylindrical screen and having a pressure pump-feeding stock under predetermined pressure from said influent chamber through said screen into said effluent chamber, said separator being characterized by: separator slots forming the perforations in said screen, comprising a multiplicity of identical, equally spaced-apart, fine, narrow, elongated slits in the upstream face of said screen, each slit merging into a coarse, wide, elongated groove with sides diverging from the slit to the downstream side of said screen, and clearance blades extending along said screen and mounted to rotate at a predetermined speed within said effluent pressure chamber in a cylindrical path proximate to, but spaced from, the downstream face of said screen, the surface of each blade proximate to said screen being inclined rearwardly toward said screen from its leading edge to closely adjacent said screen, said blades cooperating with said screen to create pressure through said slots and
  • each slot is at least five times wider than the slit on the upstream face of said slot and each said slot is at least 25 times the width of said groove in length, whereby if the groove is 2.5 millimeters in width, the slot is about 0.4 millimeters in width and the slot is about 60 millimeters in length. 5.
  • each fine narrow slit in the upstream end of each slot is defined by a pair of parallel, elongated sidewalls to define a slit of rectangular configuration and predetermined depth
  • each said groove in the downstream end of each said slot is defined mainly by a pair'of diverging, elongated sidewalls to define a boat-shaped configuration of predetermined depth substantially. greater than the depth of said parallel walled slit.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
US682717A 1964-09-16 1967-10-26 Separator for paper pulp suspensions Expired - Lifetime US3581903A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEF26679U DE1905832U (de) 1964-09-16 1964-09-16 Sichter fuer papierstoff-suspensionen.

Publications (1)

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US3581903A true US3581903A (en) 1971-06-01

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US682717A Expired - Lifetime US3581903A (en) 1964-09-16 1967-10-26 Separator for paper pulp suspensions

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US (1) US3581903A (enrdf_load_stackoverflow)
DE (1) DE1905832U (enrdf_load_stackoverflow)
FI (1) FI42790B (enrdf_load_stackoverflow)
GB (1) GB1060019A (enrdf_load_stackoverflow)
SE (1) SE309715B (enrdf_load_stackoverflow)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4105543A (en) * 1974-08-09 1978-08-08 The Black Clawson Company Method for screening paper fiber stock
US4252641A (en) * 1979-08-06 1981-02-24 The Black Clawson Company Pressurized screen
US4276159A (en) * 1980-06-19 1981-06-30 The Black Clawson Company Apparatus for screening paper fiber stock
US4287055A (en) * 1978-07-11 1981-09-01 Firma Hermann Finckh Maschinenfabrik Gmbh & Co. Method of sorting fibre suspensions as well as a pressure sorter for performing the method
EP0067912A1 (en) * 1981-06-19 1982-12-29 The Black Clawson Company Paper making stock screen and a system for treating paper making stock
EP0119345A1 (en) * 1983-01-21 1984-09-26 The Black Clawson Company Screening apparatus for paper making stock
EP0146641A1 (de) * 1983-10-11 1985-07-03 Hermann Finckh Maschinenfabrik GmbH & Co. Sortiersieb für Fasersuspensionen
US4529519A (en) * 1982-05-04 1985-07-16 Hermann Finckh Maschinenfabrik Gmbh Co. Screen cage for separators for sorting fibre suspensions
EP0275967A3 (en) * 1987-01-19 1989-02-08 A. Ahlstrom Corporation Method and apparatus for separating knots
US4957630A (en) * 1988-12-27 1990-09-18 Bratten Jack R Drum filter with divergent hole perforated filter media
US5221437A (en) * 1991-07-08 1993-06-22 The Black Clawson Company Screening apparatus for paper making stock
US5259512A (en) * 1989-12-06 1993-11-09 Hermann Finckh Maschinenfabrik Gmbh & Co. Screen for pressure sorters for fiber suspensions
US5393418A (en) * 1991-07-24 1995-02-28 E. Beaudrey & Cie Water intake, in particular for industrial installations
US5566833A (en) * 1995-01-25 1996-10-22 Hermannfinckh Maschinenfabrik Gmbh & Co. Pressure sorter for fiber suspensions as well as a process for the preparation of fiber suspensions
US5601192A (en) * 1992-06-20 1997-02-11 Hermann Finckh Maschinenfabrik Gmbh & Co. Pressure sorter for fiber suspensions
US5846410A (en) * 1994-07-13 1998-12-08 Elofsson; Birger Cassette device
US20070240843A1 (en) * 2003-09-01 2007-10-18 Heikki Niiranen Screen Structure for Use in The Manufacture of a Fiber Product
US20080217214A1 (en) * 2007-03-08 2008-09-11 Aikawa Iron Works Co., Ltd. Papermaking screen device
US20120152861A1 (en) * 2010-12-17 2012-06-21 Jay Vanier Waste separation and processing system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT377709B (de) * 1981-02-16 1985-04-25 Chemiefaser Lenzing Ag Filterapparat zur abtrennung von feststoffen aus fluessigkeiten
SE453674B (sv) * 1985-06-18 1988-02-22 Kamyr Ab Anordning for silning av foretredesvis medelkonsistensmassa
EP0383622A3 (en) * 1989-02-16 1990-12-19 Tom Holdings Limited Filtration process

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US765182A (en) * 1901-05-11 1904-07-19 Kisinger Ison Company Tubular strainer.
US1991286A (en) * 1931-02-28 1935-02-12 Svenska Ackumulator Ab Filter
US2014945A (en) * 1934-07-13 1935-09-17 Mayer Edmund Mashing apparatus
US2084433A (en) * 1934-10-27 1937-06-22 Chorlton Frank Oscar Levi Filter, strainer, and the like
US3174622A (en) * 1960-01-22 1965-03-23 Lamort E & M Apparatus for cleaning liquids containing in suspension solid particles and particularly cellulosic pulps
US3221819A (en) * 1964-05-01 1965-12-07 Richard E Dickinson Well screen
US3255074A (en) * 1964-04-03 1966-06-07 Beloit Corp Headbox for paper-making machine

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US765182A (en) * 1901-05-11 1904-07-19 Kisinger Ison Company Tubular strainer.
US1991286A (en) * 1931-02-28 1935-02-12 Svenska Ackumulator Ab Filter
US2014945A (en) * 1934-07-13 1935-09-17 Mayer Edmund Mashing apparatus
US2084433A (en) * 1934-10-27 1937-06-22 Chorlton Frank Oscar Levi Filter, strainer, and the like
US3174622A (en) * 1960-01-22 1965-03-23 Lamort E & M Apparatus for cleaning liquids containing in suspension solid particles and particularly cellulosic pulps
US3255074A (en) * 1964-04-03 1966-06-07 Beloit Corp Headbox for paper-making machine
US3221819A (en) * 1964-05-01 1965-12-07 Richard E Dickinson Well screen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
deGall, German application No. 1131081, printed 6 June, 1962 (210/415) *

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4105543A (en) * 1974-08-09 1978-08-08 The Black Clawson Company Method for screening paper fiber stock
US4287055A (en) * 1978-07-11 1981-09-01 Firma Hermann Finckh Maschinenfabrik Gmbh & Co. Method of sorting fibre suspensions as well as a pressure sorter for performing the method
US4252641A (en) * 1979-08-06 1981-02-24 The Black Clawson Company Pressurized screen
US4276159A (en) * 1980-06-19 1981-06-30 The Black Clawson Company Apparatus for screening paper fiber stock
EP0042742A1 (en) * 1980-06-19 1981-12-30 The Black Clawson Company Apparatus for screening paper fiber stock
EP0067912A1 (en) * 1981-06-19 1982-12-29 The Black Clawson Company Paper making stock screen and a system for treating paper making stock
US4529519A (en) * 1982-05-04 1985-07-16 Hermann Finckh Maschinenfabrik Gmbh Co. Screen cage for separators for sorting fibre suspensions
EP0119345A1 (en) * 1983-01-21 1984-09-26 The Black Clawson Company Screening apparatus for paper making stock
EP0146641A1 (de) * 1983-10-11 1985-07-03 Hermann Finckh Maschinenfabrik GmbH & Co. Sortiersieb für Fasersuspensionen
US4571298A (en) * 1983-10-11 1986-02-18 Hermann Finckh Maschinenfabrik Gmbh & Co. Sorting screen
EP0275967A3 (en) * 1987-01-19 1989-02-08 A. Ahlstrom Corporation Method and apparatus for separating knots
US4957630A (en) * 1988-12-27 1990-09-18 Bratten Jack R Drum filter with divergent hole perforated filter media
US5259512A (en) * 1989-12-06 1993-11-09 Hermann Finckh Maschinenfabrik Gmbh & Co. Screen for pressure sorters for fiber suspensions
US5221437A (en) * 1991-07-08 1993-06-22 The Black Clawson Company Screening apparatus for paper making stock
US5393418A (en) * 1991-07-24 1995-02-28 E. Beaudrey & Cie Water intake, in particular for industrial installations
US5601192A (en) * 1992-06-20 1997-02-11 Hermann Finckh Maschinenfabrik Gmbh & Co. Pressure sorter for fiber suspensions
US5846410A (en) * 1994-07-13 1998-12-08 Elofsson; Birger Cassette device
US5566833A (en) * 1995-01-25 1996-10-22 Hermannfinckh Maschinenfabrik Gmbh & Co. Pressure sorter for fiber suspensions as well as a process for the preparation of fiber suspensions
US20070240843A1 (en) * 2003-09-01 2007-10-18 Heikki Niiranen Screen Structure for Use in The Manufacture of a Fiber Product
US7964065B2 (en) * 2003-09-01 2011-06-21 Anpap Oy Screen structure for use in the manufacture of a fiber product
US20080217214A1 (en) * 2007-03-08 2008-09-11 Aikawa Iron Works Co., Ltd. Papermaking screen device
US20120152861A1 (en) * 2010-12-17 2012-06-21 Jay Vanier Waste separation and processing system
US8980086B2 (en) * 2010-12-17 2015-03-17 Midwestern Ip, Llc Waste separation and processing system

Also Published As

Publication number Publication date
DE1905832U (de) 1964-12-03
GB1060019A (en) 1967-02-22
SE309715B (enrdf_load_stackoverflow) 1969-03-31
FI42790B (enrdf_load_stackoverflow) 1970-06-30

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