US3263598A - Apparatus for dewatering pulp - Google Patents

Apparatus for dewatering pulp Download PDF

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Publication number
US3263598A
US3263598A US356860A US35686064A US3263598A US 3263598 A US3263598 A US 3263598A US 356860 A US356860 A US 356860A US 35686064 A US35686064 A US 35686064A US 3263598 A US3263598 A US 3263598A
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US
United States
Prior art keywords
trough
pulp
members
press
nip
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 - Lifetime
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US356860A
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English (en)
Inventor
Sylla Klaus Ferdinand
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.)
Svenska Cellulosa AB
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Svenska Cellulosa AB
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 Svenska Cellulosa AB filed Critical Svenska Cellulosa AB
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Publication of US3263598A publication Critical patent/US3263598A/en
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Classifications

    • 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

Definitions

  • the pulp suspension is supplied to the trough at two, or more, opposite sides thereof and is caused to flow within the trough towards that zone of the trough which is located just below the socalled press nip, where the so-called plug of pulp has a tendency to form.
  • One preferred way of carrying out the method consists in supplying the pulp suspension at a dry content of only 0.5-l.5%, preferably of about 1% or somewhat less.
  • the dry content of the pulp suspension may also be higher than 1.5% but then there will not be obtained the same effect as that obtained with the lower dry content.
  • the invention also includes means for carrying out the method described.
  • the apparatus comprises two cooperating, substantially horizontal sheet metal cylinders 1, 2, which are provided with perforations or the like.
  • the sheet metal cylinders are adapted ⁇ to rotate in la closed press trough 3 and their lower portions are adapted to move .in a pulp suspension, which is supplied to the trough in such a manner that the suspension will be under a certain pressure within the trough.
  • a pulp suspension which is supplied to the trough in such a manner that the suspension will be under a certain pressure within the trough.
  • each of the cylinders Upon rotation of the cylinders 1, 2 in the directions -of the arrows each of the cylinders will take up a layer of pulp (not shown in the drawing), which during its upward movement is, by means of the cylinders, pressed together with the other layer of pulp to form one single web of pulp.
  • the liquid which is then squeezed away, can ilow through the perforations into the interior of each cylinder, from where it is led away at one or both ends of the
  • the trough 3 is provided with inlets 4, S for the pulp suspension, which is supplied at a dry content of only about 1%, or somewhat lower, if desired, in order to counteract the formation of an inconvenient plug below the press nip.
  • the lower portion of the trough is shaped in such a manner that the entering pulp suspension will, from each inlet, be directed towards the zone located just below the press nip and move the shortest way possible from said inlets to said zone, because between the cylinders 1, 2 and the lower portion of the trough there are provided two passages 6,
  • the trough 3 may also be provided with a pipe line 9 for supplying air, or some other gas, at the zone located just below the press nip in order to further counteract inconvenient lump formations and to provide for a tighter and more uniform web of pulp having a lower water content already prior to the web of pulp entering the press nip.
  • Apparatus for dewateri-ng fibrous pulp comprising a trough having a bottom and side walls, two parallel, substantially horizontally disposed, contiguous, roll-like, perforated press members mounted to rotate with at least their lower portions within said trough but spaced from the bottom and sides thereof, means in said side walls of said trough for supplying pulp thereto in quantity sufcient to maintain a body thereof in said trough with its upper surface in contact with said members and an outlet in the bottom of said trough positioned vertically below the nip of said members and unobstructed relative to the nip of said members with respect to large-size pulp plugs and particles.
  • Apparatus for dewatering fibrous pulp comprising a trough having a bottom and side walls, two parallel, substantially horizontally disposed contiguous, roll-like perforated press members mounted to rotate with at least their lower portions within said trough but spaced from the bottom and sides thereof, means in said side walls of said trough for supplying pulp thereto in quantity suiicient to maintain a body thereof in said trough with its upper surface in contact with said members, an outlet in the bottom of said trough positioned vertically below and unobstructed relative to the nip of said members, and means for introducing a stream of gas int-o said trough iat a location just below said nip.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
US356860A 1963-04-03 1964-04-02 Apparatus for dewatering pulp Expired - Lifetime US3263598A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE3670/63A SE307508B (enrdf_load_stackoverflow) 1963-04-03 1963-04-03

Publications (1)

Publication Number Publication Date
US3263598A true US3263598A (en) 1966-08-02

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US356860A Expired - Lifetime US3263598A (en) 1963-04-03 1964-04-02 Apparatus for dewatering pulp

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US (1) US3263598A (enrdf_load_stackoverflow)
SE (1) SE307508B (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3630720A (en) * 1969-03-17 1971-12-28 Georg Messner Process for the extraction of aluminum from its alloys
US3772144A (en) * 1971-04-14 1973-11-13 Improved Machinery Inc Apparatus and method for thickening and washing suspensions containing fibrous material
DE2322155A1 (de) * 1972-05-15 1974-01-17 Improved Machinery Inc Vorrichtung zur behandlung von suspensionen mit fasrigen bestandteilen
US3980518A (en) * 1974-03-04 1976-09-14 Sunds Aktiebolag Device for liquid-treating a running fiber web, including an arc-shaped duct
US4031013A (en) * 1974-04-02 1977-06-21 Kamyr Aktiebolag Method and apparatus for fiber suspension dewatering
US4436028A (en) 1982-05-10 1984-03-13 Wilder David M Roll mill for reduction of moisture content in waste material
US6668600B1 (en) * 1999-06-04 2003-12-30 Kvaerner Pulping Ab Distribution device for a device for dewatering pulp
WO2010050883A1 (en) * 2008-10-27 2010-05-06 Metso Paper, Inc. Apparatus and method for dewatering cellulose pulp with improved dewatering efficiency

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE18077C (de) * A. BECHEM in Hagen in Westfalen Selbsttätiger Temperatur-Regulator
DE533246C (de) * 1929-11-30 1931-09-14 I G Farbenindustrie Akt Ges Verfahren und Vorrichtung zur mechanischen Entwaesserung von schwer entwaesserbaren Massen
US2807998A (en) * 1955-02-24 1957-10-01 Du Pont Separation apparatus
US3114309A (en) * 1962-01-24 1963-12-17 Ingersoll Rand Canada Centrifugal thickener for paper pulp

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE18077C (de) * A. BECHEM in Hagen in Westfalen Selbsttätiger Temperatur-Regulator
DE533246C (de) * 1929-11-30 1931-09-14 I G Farbenindustrie Akt Ges Verfahren und Vorrichtung zur mechanischen Entwaesserung von schwer entwaesserbaren Massen
US2807998A (en) * 1955-02-24 1957-10-01 Du Pont Separation apparatus
US3114309A (en) * 1962-01-24 1963-12-17 Ingersoll Rand Canada Centrifugal thickener for paper pulp

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3630720A (en) * 1969-03-17 1971-12-28 Georg Messner Process for the extraction of aluminum from its alloys
US3772144A (en) * 1971-04-14 1973-11-13 Improved Machinery Inc Apparatus and method for thickening and washing suspensions containing fibrous material
DE2322155A1 (de) * 1972-05-15 1974-01-17 Improved Machinery Inc Vorrichtung zur behandlung von suspensionen mit fasrigen bestandteilen
US3980518A (en) * 1974-03-04 1976-09-14 Sunds Aktiebolag Device for liquid-treating a running fiber web, including an arc-shaped duct
US4031013A (en) * 1974-04-02 1977-06-21 Kamyr Aktiebolag Method and apparatus for fiber suspension dewatering
US4436028A (en) 1982-05-10 1984-03-13 Wilder David M Roll mill for reduction of moisture content in waste material
US6668600B1 (en) * 1999-06-04 2003-12-30 Kvaerner Pulping Ab Distribution device for a device for dewatering pulp
WO2010050883A1 (en) * 2008-10-27 2010-05-06 Metso Paper, Inc. Apparatus and method for dewatering cellulose pulp with improved dewatering efficiency
EP2350383A4 (en) * 2008-10-27 2013-09-18 Metso Paper Inc APPARATUS AND METHOD FOR SPINNING CELLULOSIC PASTE WITH ENHANCED SPIN EFFICIENCY

Also Published As

Publication number Publication date
SE307508B (enrdf_load_stackoverflow) 1969-01-07

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