EP0197731A2 - Verfahren und Vorrichtung zur Verdichtung von Faserbrei - Google Patents

Verfahren und Vorrichtung zur Verdichtung von Faserbrei Download PDF

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Publication number
EP0197731A2
EP0197731A2 EP86302337A EP86302337A EP0197731A2 EP 0197731 A2 EP0197731 A2 EP 0197731A2 EP 86302337 A EP86302337 A EP 86302337A EP 86302337 A EP86302337 A EP 86302337A EP 0197731 A2 EP0197731 A2 EP 0197731A2
Authority
EP
European Patent Office
Prior art keywords
roll
wire
wires
pulp
rolls
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Withdrawn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
EP86302337A
Other languages
English (en)
French (fr)
Other versions
EP0197731A3 (de
Inventor
Michael F. Kinne
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.)
Black Clawson Co
Original Assignee
Black Clawson Co
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 Black Clawson Co filed Critical Black Clawson Co
Publication of EP0197731A2 publication Critical patent/EP0197731A2/de
Publication of EP0197731A3 publication Critical patent/EP0197731A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/24—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using an endless pressing band
    • B30B9/246—The material being conveyed around a drum between pressing bands
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D21F1/80—Pulp catching, de-watering, or recovering; Re-use of pulp-water using endless screening belts

Definitions

  • the pulp and paper making industry has for many years made regular use of apparatus for thickening pulp and paper stock, usually for storage or other temporary treatment purposes.
  • the apparatus most commonly used is known as a decker, and is relatively closely comparable in structure and mode of operation with a cylinder type paper machine, in that its main components are a wire-covered cylinder mold and a vat in which the cylinder mold rotates.
  • the thickened pulp collects on the outer surface of the mold and is then dumped or couched therefrom for transport to a storage tank or other next station.
  • Deckers occupy a substantial amount of floor space, and are also relatively expensive, since the cylinder mold is a fairly complex piece of machinery, including as it does a structural framework for the filter wire.
  • a decker is necessarily slow in operation, partly because the rotational speed of the cylinder mold must be kept below values at which centrifugal force would tend to cause the thickened pulp to be thrown off its surface, and the surface speed of cylinder molds is commonly in the range of only 200-250 ft./min.
  • the thickening apparatus of the invention is of entirely different construction from a decker, and more nearly resembles a paper machine of the twin-wire vertical type.
  • the invention employs a pair of endless perforate belts like paper machine forming wires - one inside the other - which at the inlet end of the apparatus are trained around two spaced rolls from which they converge to wrap a third roll and thereby define a generally V-shaped space into which the stock to be thickened is delivered.
  • the major operating elements of the apparatus in addition to the wires are a relatively large imperforate roll, a minimum number of other rolls, and a screw conveyor for discharging the thickened pulp to one side of the machine.
  • the large imperforate roll and a second roll are rotatably mounted in spaced relation in a frame
  • drive means are provided for the large roll
  • a plurality of other rolls are rotatably mounted in the frame.
  • a headbox mounted in the frame includes an outlet for the pulp suspension to be thickened facing the large roll, and a pair of endless wires are supported on the first named two rolls and certain of the other rolls which are located to guide the wires into separate runs which travel in diverging relation from the second roll to enclose the headbox and then to converge with each other and into wrapping relation with the large roll, whereby the headbox outlet delivers pulp suspension into the space between the converging wire runs for compression therebetween and subsequent travel in sandwiched relation with the wires around the large roll.
  • Certain of the other rolls are located to guide this sandwich from the large roll into wrapping relation with the second roll, the wires are maintained under tension to cause liquid to be expressed therethrough as the wire-pulp-wire sandwich wraps the rolls during its travel from the large roll to the second roll and thereby to thicken the pulp between the wires, and trough means are mounted in the frame between the second roll and the headbox and between the separated wire runs in position to collect the thickened pulp therefrom.
  • the pulp slurry to be thickened is deposited by a headbox on the upper surface of a short, substantially horizontal run of the inside wire which converges with a run of the outside wire on the surface of the large roll after substantial gravity drainage through the inside wire.
  • the resulting sandwich of wire-pulp-wire is then caused to wrap the major portion of the large roll so that it reverses its direction and then travels around additional rolls until it completes the major part of a loop, during which travel drainage through the outside wire takes place.
  • the wires When the sandwich reaches this position, the wires separate, pass in diverging relation above and below a trough in which the thickened pulp is collected, and above and below the headbox. They then reconverge to continue the operation by receiving the continuous pulp slurry flow from the headbox while a screw conveyor in the trough delivers the pulp collected therein to a discharge location at one side of the apparatus. Throughout their travel in converged relation, the two wires are maintained under sufficient tension to exert substantial pressure on the pulp therebetween as they wrap each successive roll, and thereby to force liquid to be extruded through the wire which is outermost with respect to each roll.
  • the apparatus of the invention can be operated at much higher speeds than conventional thickeners, because the pulp being dewatered is enclosed between two wires throughout the dewatering process, and centrifugal force can thus be employed to augment the dewatering action instead of being a limitation as in the case of a decker.
  • the apparatus of the invention has a practical speed range as high as 2500 or more ft./min.
  • the apparatus of the invention is considerably simpler and requires substantially less floor space than conventional thickeners. More specifically, with the two wires following the same path throughout most of their lengths, the least number of rolls is needed. This is pointed out below in connection with the description of a preferred embodiment thereof.
  • An additional advantage is that drainage takes place through both wires from a relatively thin fiber mat, thereby promoting efficient removal of ink, chemicals and fillers when the apparatus of the invention is used in conjunction with a pulp washing operation.
  • the thickening apparatus of the invention as shown in the drawing includes a relatively simple frame comprising two columns 10 and 11 on each side connected by upper and lower side beams 12 and 13, and by any suitable cross braces 14 and 15.
  • the large plain roll 20 which is a major operating element of this apparatus is mounted by pillow block bearings 19 on the pair of columns 10, and it is driven as shown through a belt drive 21 by a motor 22 mounted on one of the cross braces 14.
  • a smaller couch roll 23 is mounted by bearings 24 on top of the pair of columns 11, and another plain roll 25 is mounted by bearings 26 on the upper pair of side beams 12 at a location between rolls 20 and 23 and at a level below that of roll 23.
  • Both wires wrap a major portion of the large roll 20, from which they travel downwardly at an angle to the vertical until they wrap a guiding and tensioning roll 33 from which they travel upwardly at a small angle to the vertical to the roll 23.
  • the two wires diverge as they leave the roll 23, the outer wire 31 traveling directly to the large roll 20, but the inner wire 30 travels downwardly into wrapping relation with a tensioning guide roll 35 from which it travels upwardly and around the fixed roll 25 to the large roll 20.
  • the tensioning guide roll 33 is mounted in bearings on arms 40 pivotally mounted at 41 on columns 11. Jacks 42 mounted at 43 on each of the side beams 13 controls the pivotal movement of the arms 40 to tension the wires by corresponding movement of roll 33.
  • the roll 35 is similarly mounted on arms 44 pivotally mounted at 45 on the columns 11 with its pivoting movement controlled by jacks 46 mounted by brackets 47 on the columns 11.
  • the arrangement of rolls 20, 23, 25 and 35 effects guiding of the two wires in the upper portion of the apparatus so that a run of the inner wire 30 travels substantially horizontally from roll 25 to roll 20, while a complementary run of the outer wire 31 travels from roll 23 directly to roll 20 in converging relation with the horizontal run of wire 30.
  • a headbox 50 is mounted on side beams 12 in the space between the separated runs of the two wires, with its slice outlet 51 projecting toward the converging wire runs and the roll 20, the headbox 50 having an inlet 52 at one side of the apparatus for receiving the pulp slurry to be thickened.
  • a drainage pan 55 is also mounted on the side beams 12, between the rolls 20 and 25, to receive liquid draining through the horizontal run of wire 30 as it travels from roll 25 to roll 20.
  • a trough 60 for receiving thickened pulp from the wires 30 and 31 as they diverge on leaving the roll 23.
  • a doctor blade 61 is mounted along the upstream edge of trough 60 to remove pulp from the upper surface of wire 30 as it leaves roll 23 and direct that pulp into the trough 60.
  • a second doctor blade 62 is mounted above the downstream side of trough 60 to remove any pulp which may cling to the underside of wire 31.
  • a conveyor screw 65 is mounted in the bottom of trough 60 and provided with a drive 66 so that it will convey the pulp accumulating in the trough 60 to the outlet 67 at the front end of the trough.
  • the headbox 50 delivers the pulp slurry to be thickened onto the upper surface of the run of wire 30 traveling from slice 51 to roll 20, in essentially the same manner as on a Fourdrinier paper machine. Gravity drainage through this run of wire 30 is collected in the pan 55 for removal to one side of the machine, and since this is free drainage through an initially bare wire, a substantial volume of white water will be removed through wire 30 between rolls 25 and 20.
  • a drain pan 70 of appropriate profile surrounds the wrapped surface of roll 20 to receive the water which is expressed through wire 31 as the sandwich wraps roll 20, and which is thrown into the pan by centrifugal force at the relatively high surface speed of roll 20.
  • the drain pan 70 is provided at its bottom end with a white water outlet 71.
  • a pan 72 is mounted between the columns 10 and 11 to underlie the run of the sandwich of wire-pulp-wire from the roll 20 to the roll 33, and it leads to another drain pan 75 of appropriate profile to surround the wrapped portion of roll 33, the pan 75 having a white water outlet 77. Gravity and tension drainage will continue through the wire 31 into the pan 72, and it is augmented by centrifugal force around the roll 33. The final run of the sandwich has already been described, which culminates in separation of the wire around roll 23 and deposit of the thickened pulp in the trough 60.
  • shower pipes 85 mounted on the columns 10 spray shower water on the run of wire 31 from roll 23 to roll 20. The shower water falls on the pulp on the converging run of wire 30, but this volume of water is so small that it has no material effect.
  • shower pipes 86 are mounted on side beams 12 to shower the run of wire 30 from rolls 35 to roll 25, with the shower water draining into a pan 88 mounted on the beams 13 connected with the white water recovery system.
  • centrifugal force aids the effectiveness of the apparatus of the invention by causing liquid to be thrown through the wire 31 as the wire-pulp-wire sandwich wraps the rolls 20 and 33.
  • Another outstanding advantage of the invention is the simplicity of construction of its apparatus and the maintenance thereof.
  • the only parts subject to serious wear are the two wires, and they are recognized as being expendable elements which require replacement from time to time just like paper machine wires.
  • wear in the filter wire of the cylinder mold of a decker requires a much more complex and expensive repair procedure, including either drainage of the vat, removal therefrom of the cylinder mold, or both.
  • the resulting down time is therefore of substantial duration on a conventional thickener whereas it is minimal on the apparatus of the invention.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
EP86302337A 1985-03-29 1986-03-27 Verfahren und Vorrichtung zur Verdichtung von Faserbrei Withdrawn EP0197731A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US71775785A 1985-03-29 1985-03-29
US717757 1985-03-29

Publications (2)

Publication Number Publication Date
EP0197731A2 true EP0197731A2 (de) 1986-10-15
EP0197731A3 EP0197731A3 (de) 1988-07-06

Family

ID=24883347

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86302337A Withdrawn EP0197731A3 (de) 1985-03-29 1986-03-27 Verfahren und Vorrichtung zur Verdichtung von Faserbrei

Country Status (2)

Country Link
EP (1) EP0197731A3 (de)
JP (1) JPS61258091A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0251787A1 (de) * 1986-07-03 1988-01-07 The Black Clawson Company Vorrichtung und Verfahren zum Eindicken von Papierfaserbrei
EP0412250A1 (de) * 1989-08-10 1991-02-13 J.M. Voith GmbH Entwässerungseinrichtung insbesondere Banddruckfilter
DE4218174A1 (de) * 1991-06-13 1992-12-17 Andritz Patentverwaltung Doppelsiebentwaesserungseinrichtung
EP0562223A2 (de) * 1992-03-23 1993-09-29 Valentin Stossier Ohg Siebbandpresse

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT325938B (de) * 1972-05-05 1975-11-10 Nordstjernan Rederi Ab Entwässerungsmaschine für paserstoffsuspensionen od.dgl.
DE3005681A1 (de) * 1980-02-06 1981-08-13 Escher Wyss Gmbh, 7980 Ravensburg Siebmaschine
DE3020119A1 (de) * 1980-05-27 1981-12-10 Envirotech Corp., Menlo Park, Calif. Verfahren und vorrichtung zum waschen von vakuumfiltrierbaren materialien, insbesondere papierfaserpulpe

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT325938B (de) * 1972-05-05 1975-11-10 Nordstjernan Rederi Ab Entwässerungsmaschine für paserstoffsuspensionen od.dgl.
DE3005681A1 (de) * 1980-02-06 1981-08-13 Escher Wyss Gmbh, 7980 Ravensburg Siebmaschine
DE3020119A1 (de) * 1980-05-27 1981-12-10 Envirotech Corp., Menlo Park, Calif. Verfahren und vorrichtung zum waschen von vakuumfiltrierbaren materialien, insbesondere papierfaserpulpe

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0251787A1 (de) * 1986-07-03 1988-01-07 The Black Clawson Company Vorrichtung und Verfahren zum Eindicken von Papierfaserbrei
EP0412250A1 (de) * 1989-08-10 1991-02-13 J.M. Voith GmbH Entwässerungseinrichtung insbesondere Banddruckfilter
DE4218174A1 (de) * 1991-06-13 1992-12-17 Andritz Patentverwaltung Doppelsiebentwaesserungseinrichtung
DE4218174C2 (de) * 1991-06-13 2000-06-29 Andritz Patentverwaltung Doppelsiebentwässerungseinrichtung
EP0562223A2 (de) * 1992-03-23 1993-09-29 Valentin Stossier Ohg Siebbandpresse
EP0562223A3 (de) * 1992-03-23 1994-04-27 Valentin Stossier Ohg

Also Published As

Publication number Publication date
JPS61258091A (ja) 1986-11-15
EP0197731A3 (de) 1988-07-06

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Inventor name: KINNE, MICHAEL F.