EP0616072A1 - Procédé de triage d'un suspension de fibres et dispositif de triage pour son application - Google Patents

Procédé de triage d'un suspension de fibres et dispositif de triage pour son application Download PDF

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Publication number
EP0616072A1
EP0616072A1 EP94102519A EP94102519A EP0616072A1 EP 0616072 A1 EP0616072 A1 EP 0616072A1 EP 94102519 A EP94102519 A EP 94102519A EP 94102519 A EP94102519 A EP 94102519A EP 0616072 A1 EP0616072 A1 EP 0616072A1
Authority
EP
European Patent Office
Prior art keywords
partition
screening device
flow
openings
distance
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.)
Granted
Application number
EP94102519A
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German (de)
English (en)
Other versions
EP0616072B1 (fr
Inventor
Wolfgang Mannes
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.)
Voith Paper Fiber and Environmental Solutions GmbH and Co KG
Original Assignee
Escher Wyss GmbH
Voith Sulzer Stoffaufbereitung GmbH
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.)
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Publication date
Application filed by Escher Wyss GmbH, Voith Sulzer Stoffaufbereitung GmbH filed Critical Escher Wyss GmbH
Publication of EP0616072A1 publication Critical patent/EP0616072A1/fr
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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
    • D21D5/04—Flat screens
    • 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

Definitions

  • the invention relates to a method for sorting fiber suspension according to the preamble of claim 1 and a screening device for carrying it out.
  • Such sorting processes are often used in plants for the processing of waste paper, possibly also in the treatment of pulp suspensions.
  • the aim of such a treatment of pulp suspensions is the separation of impurities or pieces of pulp which cannot be dissolved sufficiently.
  • the focus is on contaminating substances that come from the use of the paper and would interfere with the processing and reuse of the recycled waste paper.
  • Plastic contaminants, adhesive backs and highly wet-strength paper parts are particularly important.
  • other contaminants can also be removed by means of such screening devices; For economic reasons, however, it is advisable in many cases to use the density deviating from the suspension, particularly in relation to stones, broken glass and metal parts, in hydrocyclones.
  • the styrofoam parts also have the property of being able to float easily due to a much lower density and thereby be removable in hydrocyclones, on the other hand they are very easy to shred by mechanical forces to such an extent that their removal then becomes difficult. For this reason, it is often also desirable to remove styrofoam parts from the suspension very early in the preparation process.
  • the aim of the invention is therefore to provide a method which guarantees problem-free operation, in particular freedom from blockages in a continuous driving style, but on the other hand does not crush the contaminants to be separated out or at most to such an extent that they can be eliminated effectively and economically.
  • the flow blades are designed in this way and relative to the other parts of the machine positioned that mechanical comminution of the solids is extremely low.
  • relatively large distances to the parts of the machine, relative to which the flow blades move can be selected, rounded edges on the flow blades and / or a cross-sectional geometry of the blades, which is designed such that the greatest possible momentum transfer to the suspension takes place, and so the relative movement between suspension and flow blades is reduced.
  • the effect of the flow blades can advantageously be adjusted so that a transport movement of the solids takes place on the inlet side when they are being lifted off the partition by the pressure impulse of the scrapers through the openings. A clogging of the openings in the partition can therefore not occur.
  • a low mechanical stress on the fibrous material may occasionally be desirable as long as there is no excessive comminution of contaminants.
  • FIG. 1 shows a model of the sorting process according to the invention in three phases (1a, 1b, 1c), shown roughly schematically.
  • both a flow blade 7 and a scraper 6 move along a partition wall 3 serving as a separating element.
  • the suspension flow is indicated by arrows 12 in the area of the openings 2.
  • a pressure pulse forms, which causes a backflow through the openings of the separating element.
  • Fig. 1 b the solid particle 13 has attached itself to the separating element 3 and clogs part of the openings.
  • the next flow blade 7 and the next scraper 6 are already approaching.
  • the pressure pulse of the scraper 6 pushes the solid particles away from the separating element 3 so far that they can be moved by the flow generated by the blade 7 .
  • FIG. 2 shows an example of a screening device with which the method according to the invention can be carried out. It shows schematically a side sectional view of a housing 1 receiving the suspension S, which contains a partition 3 as a partition.
  • the partition 3 has a multiplicity of openings 2 (FIG. 3).
  • the suspension flow which can pass through the dividing wall 3 through the openings 2, is led out of the housing through a connecting piece as a good substance G.
  • the remaining amount also comes out of the housing 1 through a nozzle other than Reject R.
  • the amount G is much larger than the amount R.
  • the connecting shaft is guided centrally through the dividing wall 3, it being possible for sealing parts 10 to be used.
  • a gap remains through which part of the suspension can flow. This would be harmless as long as no coarse parts get into the casting and there is no blocking of this space.
  • the rotors can be driven, for example via a pulley 11. Furthermore, there is storage 12 indicated.
  • FIG. 3 shows a section of FIG. 2 and shows in particular how the distance A1 between flow blades 7 and partition 3 and the distance A2 between partition 3 and reamer 6 are defined.
  • FIG. 4 again shows schematically, in section, a differently designed screening device according to the invention, in which the partition 3 is constructed essentially in a circular cylindrical manner, the openings (not shown here) for the passage of the suspension being located in the cylinder surface.
  • Such machines are referred to as pressure sorters and the partitions used therein because of their shape as screen baskets.
  • the sorter shown here has an inlet for the material suspension S on its radial outer wall, so that the main flow of the suspension takes place radially from the outside inwards and the cleaned suspension as accept material G can flow out of the interior of the sieve basket here through the cover.
  • the retained parts are removed as reject R from the annular space radially outside the strainer basket.
  • the outer diameter of the rotor with the flow blades 7 ' is selected in FIG. 5 so that it is slightly smaller than the inner diameter of the annular perforated partition 3'. This makes it easy to Install and remove from the inlet side 4 without removing the rotor carrying the flow blades 7 '.
  • the rotor itself becomes smaller and therefore cheaper. In operation, its effect also extends to the radially outside area, so that the holes can be kept free by interaction with the clearers 6 passing close to the partition 3 '.
  • sorters with screen baskets also radially from the inside out can be flowed through, with the application of the invention, the more intensely acting clearers are located radially outside and the less intensely acting flow blades are located radially inside the screen basket.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
EP94102519A 1993-03-16 1994-02-19 Procédé de triage d'un suspension de fibres et dispositif de triage pour son application Expired - Lifetime EP0616072B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4308225 1993-03-16
DE4308225A DE4308225C1 (de) 1993-03-16 1993-03-16 Verfahren zur Sortierung von Faserstoffsuspension sowie Siebvorrichtung zu seiner Durchführung

Publications (2)

Publication Number Publication Date
EP0616072A1 true EP0616072A1 (fr) 1994-09-21
EP0616072B1 EP0616072B1 (fr) 1997-06-18

Family

ID=6482861

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94102519A Expired - Lifetime EP0616072B1 (fr) 1993-03-16 1994-02-19 Procédé de triage d'un suspension de fibres et dispositif de triage pour son application

Country Status (4)

Country Link
US (1) US5509536A (fr)
EP (1) EP0616072B1 (fr)
AT (1) ATE154650T1 (fr)
DE (1) DE4308225C1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6041035A (en) * 1997-06-30 2000-03-21 Rockwell Collins, Inc. Open system modular electronics architecture
EP1059381B1 (fr) * 1999-06-09 2004-04-21 Voith Paper Patent GmbH Rotor pour un pulpeur
KR100492517B1 (ko) * 2002-03-07 2005-06-03 장형수 닥나무 인피섬유를 이용한 인피섬유지 제조장치, 제조방법및 그 방법에 의해 제조된 인피섬유지
US7188622B2 (en) * 2003-06-19 2007-03-13 3M Innovative Properties Company Filtering face mask that has a resilient seal surface in its exhalation valve
DE502006008007D1 (de) * 2005-10-19 2010-11-18 Voith Patent Gmbh Siebvorrichtung zur Nasssiebung von Papierfasersuspensionen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2480119A (en) * 1946-02-25 1949-08-30 Hervey G Cram Disk pulp screen
DE2750499A1 (de) * 1977-11-11 1979-05-17 Finckh Maschf Sortierer fuer fasersuspensionen
EP0465312A1 (fr) * 1990-07-02 1992-01-08 E & M LAMORT Dispositif de triage d'un mélange de pate à papier et de contaminants
DE9303811U1 (de) * 1993-03-16 1993-04-29 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Siebvorrichtung für Faserstoffsuspension

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE233493C (fr) *
US3456793A (en) * 1966-01-24 1969-07-22 Beloit Corp Dual pressure stock screen
SE327328B (fr) * 1967-05-17 1970-08-17 G Holm
US3672506A (en) * 1970-05-06 1972-06-27 Jylhavaara Osakeyhtio Pressure strainer device
GB1348347A (en) * 1971-08-16 1974-03-13 Burkhardt H H Kurtz H M Apparatus for filtering a fibrous material suspension
FI51221C (fi) * 1972-06-21 1976-11-10 Yhtyneet Paperitehtaat Oy Painesihtilaite.
DE2830386C2 (de) * 1978-07-11 1982-09-02 Hermann Finckh, Maschinenfabrik GmbH & Co, 7417 Pfullingen Verfahren zum Sortieren von Fasersuspensionen sowie Drucksortierer zur Durchführung des Verfahrens
AT365676B (de) * 1979-05-04 1982-02-10 Escher Wyss Gmbh Anlage zur aufbereitung von altpapier
AT378541B (de) * 1981-03-23 1985-08-26 Escher Wyss Gmbh Sortiervorrichtung fuer stoffsuspensionen zur papierherstellung
US4543181A (en) * 1982-12-16 1985-09-24 Kamyr, Inc. Medium consistency flat disk pressure screen
DE3320125A1 (de) * 1983-06-03 1984-12-06 J.M. Voith Gmbh, 7920 Heidenheim Verfahren und einrichtung zur aufbereitung von altpapier
DE3322578C2 (de) * 1983-06-14 1986-01-16 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Sortiervorrichtung
US4717471A (en) * 1985-09-05 1988-01-05 The Black Clawson Company Apparatus for screening paper fiber stock
FI76139C (fi) * 1987-01-19 1988-09-09 Ahlstroem Oy Foerfarande och anordning foer kvistseparering.
US5064537A (en) * 1987-04-16 1991-11-12 The Black Clawson Company Seamless screen cylinder with laser cut openings
SE461104B (sv) * 1988-05-05 1990-01-08 Kamyr Ab Apparat foer uppdelning av en suspension av en fiberhaltig cellulosamassa
FI80736B (fi) * 1989-02-16 1990-03-30 Tampella Oy Ab Foerfarande foer sortering av massasuspension och sorteringsapparat.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2480119A (en) * 1946-02-25 1949-08-30 Hervey G Cram Disk pulp screen
DE2750499A1 (de) * 1977-11-11 1979-05-17 Finckh Maschf Sortierer fuer fasersuspensionen
EP0465312A1 (fr) * 1990-07-02 1992-01-08 E & M LAMORT Dispositif de triage d'un mélange de pate à papier et de contaminants
DE9303811U1 (de) * 1993-03-16 1993-04-29 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Siebvorrichtung für Faserstoffsuspension

Also Published As

Publication number Publication date
ATE154650T1 (de) 1997-07-15
EP0616072B1 (fr) 1997-06-18
DE4308225C1 (de) 1994-11-24
US5509536A (en) 1996-04-23

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