US3182966A - Method and means for equalizing quality fluctuations in manufacture of fibre mass - Google Patents

Method and means for equalizing quality fluctuations in manufacture of fibre mass Download PDF

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Publication number
US3182966A
US3182966A US100409A US10040961A US3182966A US 3182966 A US3182966 A US 3182966A US 100409 A US100409 A US 100409A US 10040961 A US10040961 A US 10040961A US 3182966 A US3182966 A US 3182966A
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Prior art keywords
pulp
slurry
chest
paper
manufacture
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Expired - Lifetime
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US100409A
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English (en)
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Carlsson Ake Simon
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Individual
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Individual
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    • 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
    • D21D5/28—Tanks for storing or agitating 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

Definitions

  • ThisV burring is made at intervals determined by the hardness of the stone, a sand stone or cement stone having-to be burred more frequently than a ceramic stone.
  • a burring a rather coarse pulp is obtained, but with the wear of the stone surface the neness of the pulp increases and at the end of the interval a very fine groundwood pulp is produced. Concomitantly the rate of production drops and the risk of burning increases. Pulp quality variations therefore become more pronounced when the number of grinders is small in, an installation even if the burrings are spaced to give the best possible distribution of burring intervals.
  • Pulp quality fluctuations can also be caused by the wood quality. This applies to chemical and semichemical pulps as well as groundwood pulp. The fluctuations may be caused by theuse of different species of wood or by variations in quality of a certain species.
  • pulp suspension is carried through a pipe to the top of a tower and from the bottom of this tower through another pipe to the pulp consumer.
  • the invention is characterized by the recirculation of part of the pulp taken out from the bottom of the tower up to the tower top where it is mixed with incoming stock.
  • the mixing of incoming and recirculated stock takes place in a special feeding and distribution device before the stock enters the tower. This feeding device ensures distribution of the stock along the periphery of the tower where it is deposited in an helical stream.
  • This feeding device ensures distribution of the stock along the periphery of the tower where it is deposited in an helical stream.
  • FIG. 1 shows a vertical section of a tower built according to this invention and FIG. 2 a section along the line II-II in FIG. l.
  • the pulp 10 is the cylindrical wall of the tower which at the bottom joins a cone 12 at the bottom of which there is
  • the pulp suspension is added through the pipe 16 which empties into a central hopper 13 right above the tower.
  • the blended pulp is extracted from the pump well 14 of the tower and pumped by a pump 22 through a pipe 20 to the pulp consumer which might be a newsprint mill or a pulp machine.
  • the pipe 20 may be equipped with valves 24 and 26.
  • another pump 30 transports the pulp through the pipe 28 to a vertical channel 32 which runs along the side of the tower up to the top of it where a pipe 34 connects it to the hopper 18.
  • the pipe 28 can be supplied with valves 36 and 38.
  • the pipes 28, 32 and 34 carry pulp from the bottom of the tower back to the hopper 18 where itis mixed with incoming pulp from pipe 16.
  • the mixing apparatus 40 contains a rotating horizontal screw and rotates itselfV in a horizontal plane around a pivot 42 placed on a concrete oor 44.
  • the outlet end of the apparatus is supportedV by two wheels 46 which travel on a concrete rim 48 elevated above the floor 44.
  • the apparatus is rotated by the motor 50 at a velocity which may-amount to one revolution per hour and is generally lower than ten revolutions per hour.
  • the mixing apparatus has the shape of a radially posi- ⁇ tioned cylindrical drum containing a screw feeder 52 driven by a motor 50 through a gear box 54.
  • the ap- Y suspension falls down. into the tower.
  • the stock hits the surface, the stock flows out radially tof paratus mixes incoming and recirculated stock and feeds the mixture to the outlet 56 in the bottom of the drum at the periphery of the tower.
  • Below this outlet there. is an annular slot 58 in the floor 44 through which the pulp When this, jet of wardsthe periphery as well as towards the center of the tower as indicated by arrows in the figure.
  • the distancey between the slot and the tower wall is chosen so as to ensure the best possible distribution of stock across the surface of the tower. make the area inside the ring of disposited stock equal to the area of the annular space between this ring and the tower wall.
  • the stock level in the tower 10 will drop as stockleaves through pipes 20 and 28.
  • the level is however maintained by continuous addition of stock in a helical stream through the inlet opening 56.
  • the degree of mixing is controlled by altering the ow of recirculated stock from the pump. well 14 to the hopper 18.
  • the usually constantow of stock through pipe 20 to the pulp consumer shall equal the ow of incoming stock through pipe 16.
  • a level controller (not shown) may be used to maintain the stock level Within a devised range by actuating the valve 24.
  • the speed of rotationof the mixing apparatus can be varied to suit the time scale of the pulp quality fluctuations of incoming stock.
  • the invention is of course not limited to the design described, which can be varied widely within the general framework of the conception.
  • the pumps 22 and 30 may be replaced by one pump which both circulates and pumps stock -to the pulp consumer.
  • storage chest apparatus for storage of a pulp slurry for the manufacture of paper and paper board, comprising in combination a generally cylindrical and vertical storage container for said slurry, means for introducing said slurry as a generally helical stream at the top of said chest for enhanced mixing of introduced slurry with slurry already in said chest, outlet means for withdrawing slurry from said chest adjacent the bottom thereof for introduction to said manufacture of paper and paper board, a re-circulating outlet also adjacent the bottom of said chest, and pump means for re-circulating pulp i slurry Withdrawn through said re-circulating outlet back into the stream of'pulp being introduced into said chest, and means for admixing said re-circulated pulp slurry and said pulp being introduced into said chest prior to the actual introduction of said stream to pulp already in said chest for admixture therewith.
  • Apparatus as recited in claim 5 in which said means for introducing pulp slurry includes an elongated conveyor having an effective length substantially less than the radius of said storage chest.
  • Apparatus as recited in claim 5 in which said means for introducing said pulp stream includes a rotating arm rotatable about the axis of said storage chest effecting communal flow of said pulp into said chest as said helical stream.
  • said rotating arm also includes conveyor means for conveying pulp horizontally therethrough and opposed pulp inlet and pulp outlet in spaced relationship along said arm, and in which said arm and said conveyor receive both new pulp and pulp re-circulated from said chest for admixture prior to introduction into said chest.
  • Apparatus as recited in claim 5 which also includes a pulp outlet adjacent the bottom of said chest for withdrawing admixed pulp therefrom and independently of re-circulation of pulp in said chest.
  • Apparatus as recited in claim 5 which also includes means for re-circulating pulp in said chest and for admixing said re-circulated pulp with newly entering pulp prior to introduction thereof into said chest.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
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US100409A 1960-04-06 1961-04-03 Method and means for equalizing quality fluctuations in manufacture of fibre mass Expired - Lifetime US3182966A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE342360 1960-04-06

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US (1) US3182966A (enExample)
GB (1) GB985196A (enExample)
NO (1) NO118952B (enExample)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4560282A (en) * 1981-12-18 1985-12-24 Gerhard Gergely Apparatus for mixing and granulating powdery substances with a sifting device attached by means of a valve closure
US4850702A (en) * 1980-04-28 1989-07-25 Geo Condor, Inc. Method of blending materials
US4915505A (en) * 1980-04-28 1990-04-10 Geo Condor, Inc. Blender apparatus
US20080245379A1 (en) * 2005-09-28 2008-10-09 China Tobacco Hunan Industrial Co. Ltd. Method and Equipment for Adding Tobacco Dust into Papermaking Tobacco Sheet
WO2019056407A1 (zh) * 2017-09-20 2019-03-28 南通翔龙纸业有限公司 一种节能型存浆池

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE416600C (de) * 1925-07-22 Torbjoern Nils Magnus Molin Verfahren und Einrichtung, um aus Zellstoff, Torfmasse und aehnlichen Massen in einem bestimmten Arbeitsvorgang eine Fluessigkeit von hohem spezifischen Gewicht oder niedriger Temperatur mittels einer Fluessigkeit von niedrigem spezifischen Gewicht bzw. hoher Temperatur auszutreiben oder die Masse zu erwaermen
GB426841A (en) * 1934-04-13 1935-04-10 Lewis Losey Alsted Method of and apparatus for removing printing ink from paper
US2089992A (en) * 1932-03-14 1937-08-17 Int Paper Co Continuous bleaching process and apparatus
US2383684A (en) * 1940-11-08 1945-08-28 Kamyr Ab Process of continuous alkali treatment of fibrous material
US2635859A (en) * 1950-06-12 1953-04-21 Felix W Dreyfus Mixer apparatus
US2915023A (en) * 1956-01-13 1959-12-01 Gustave H Rapaport Method and apparatus for mixing icings, cake batters and the like
US2997373A (en) * 1959-01-19 1961-08-22 Barnard & Leas Mfg Company Inc Dissolving apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE416600C (de) * 1925-07-22 Torbjoern Nils Magnus Molin Verfahren und Einrichtung, um aus Zellstoff, Torfmasse und aehnlichen Massen in einem bestimmten Arbeitsvorgang eine Fluessigkeit von hohem spezifischen Gewicht oder niedriger Temperatur mittels einer Fluessigkeit von niedrigem spezifischen Gewicht bzw. hoher Temperatur auszutreiben oder die Masse zu erwaermen
US2089992A (en) * 1932-03-14 1937-08-17 Int Paper Co Continuous bleaching process and apparatus
GB426841A (en) * 1934-04-13 1935-04-10 Lewis Losey Alsted Method of and apparatus for removing printing ink from paper
US2383684A (en) * 1940-11-08 1945-08-28 Kamyr Ab Process of continuous alkali treatment of fibrous material
US2635859A (en) * 1950-06-12 1953-04-21 Felix W Dreyfus Mixer apparatus
US2915023A (en) * 1956-01-13 1959-12-01 Gustave H Rapaport Method and apparatus for mixing icings, cake batters and the like
US2997373A (en) * 1959-01-19 1961-08-22 Barnard & Leas Mfg Company Inc Dissolving apparatus

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4850702A (en) * 1980-04-28 1989-07-25 Geo Condor, Inc. Method of blending materials
US4915505A (en) * 1980-04-28 1990-04-10 Geo Condor, Inc. Blender apparatus
US4560282A (en) * 1981-12-18 1985-12-24 Gerhard Gergely Apparatus for mixing and granulating powdery substances with a sifting device attached by means of a valve closure
US20080245379A1 (en) * 2005-09-28 2008-10-09 China Tobacco Hunan Industrial Co. Ltd. Method and Equipment for Adding Tobacco Dust into Papermaking Tobacco Sheet
US9016286B2 (en) * 2005-09-28 2015-04-28 China Tobacco Hunan Industrial Co. Ltd. Method and equipment for adding tobacco dust into papermaking tobacco sheet
WO2019056407A1 (zh) * 2017-09-20 2019-03-28 南通翔龙纸业有限公司 一种节能型存浆池

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Publication number Publication date
NO118952B (enExample) 1970-03-02
GB985196A (en) 1965-03-03

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