WO1992007993A1 - Procede et appareil de desencrage de dechets de papier - Google Patents

Procede et appareil de desencrage de dechets de papier Download PDF

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Publication number
WO1992007993A1
WO1992007993A1 PCT/GB1991/001892 GB9101892W WO9207993A1 WO 1992007993 A1 WO1992007993 A1 WO 1992007993A1 GB 9101892 W GB9101892 W GB 9101892W WO 9207993 A1 WO9207993 A1 WO 9207993A1
Authority
WO
WIPO (PCT)
Prior art keywords
vessel
stock
pulping
ink
ink particles
Prior art date
Application number
PCT/GB1991/001892
Other languages
English (en)
Inventor
Stanley Blum
Trevor William Ridgley Dean
Original Assignee
Stanley Blum
Trevor William Ridgley Dean
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
Priority claimed from GB909023564A external-priority patent/GB9023564D0/en
Priority claimed from GB909027001A external-priority patent/GB9027001D0/en
Application filed by Stanley Blum, Trevor William Ridgley Dean filed Critical Stanley Blum
Priority to JP3517139A priority Critical patent/JPH06504327A/ja
Priority to BR9107039A priority patent/BR9107039A/pt
Publication of WO1992007993A1 publication Critical patent/WO1992007993A1/fr
Priority to FI931963A priority patent/FI931963A0/fi
Priority to NO931588A priority patent/NO931588D0/no

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/32—Defibrating by other means of waste paper
    • D21B1/325—Defibrating by other means of waste paper de-inking devices
    • D21B1/327—Defibrating by other means of waste paper de-inking devices using flotation devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

Definitions

  • This invention relates to a method and apparatus for removing ink from waste paper material, particularly in the recycling of printed waste paper.
  • waste paper which may carry printed matter is placed in a pulping vessel, such as a hydropulper, in which it is stirred or agitated to form a slushed fibrous stock consisting of a suspension of the disintegrated waste paper fibres in water.
  • a pulping vessel such as a hydropulper
  • the stock is passed into a stock chest where it dwells for between 1-1 1/2 hours. It is then usually passed through a thick stock centrifugal cleaner where it is 'cleaned' as regards heavy contraries, and thence onto a vibrating screen where foil and plastics are removed.
  • the next stage is a high speed deflaker from which it is then diluted to about 0.8% consistency from a normal low consistency pulping of about 6%, and passed into the first of a series of primary flotation cells. Flota ⁇ tion chemicals are added either prior to, or directly into, the first of the primary flotation cells, in which the fibrous stock is de-inked by the flotation of ink particles therefrom.
  • one aspect of the present invention consists in a method for removing ink from waste paper material, the method comprising pulping the waste paper material in a pulping vessel to form a slushed fibrous stock, dispersing ink particles within the fibrous stock, and removing the dispersed ink particles from the stock, characterised in that the removal of dispersed ink parti ⁇ cles is carried out in the pulping vessel and/or in a storage vessel to which the stock is passed from the pulp ⁇ ing vessel.
  • the dispersed ink particles may be removed from the stock in the pulping vessel and/or in the storage vessel by suction using vacuum means.
  • the dispersed ink particles may be removed by means of a container supported in the pulping vessel and/or storage vessel and having a perforat ⁇ ed wall structure such that when the stock is stirred or agitated, ink particles circulating therein can pass through the perforations into the container but the fibres forming the stock are substantially prevented from passing through the perforations.
  • At least one stream of air, water, or air and water may be introduced into the pulping vessel and/or storage vessel, preferably into the lower part of the vessel beneath the circulating stock.
  • the waste paper material When ink particles are removed in the pulping vessel, the waste paper material may be stirred or agitated within the pulping vessel alternately at a first speed to effect the pulping and encourage the dispersal of ink particles within the fibrous stock and at a second speed lower than the first speed to remove dispersed ink parti ⁇ cles.
  • the stirring or agitating speed may be alternately increased and reduced as many times as required.
  • Common paper making chemicals may be added into the fibrous stock in the pulping vessel and/or storage vessel.
  • a chemical agent for dispersing ink parti ⁇ cles within the fibrous stock may be added, and possibly also a chemical which prevents redeposition of the ink particles onto the fibrous stock.
  • Inorganic filler parti ⁇ cles to absorb any free ink particles in the vessel may also be added.
  • the present invention consists in apparatus for removing ink from waste paper material, the apparatus comprising a pulping vessel for containing the waste paper material and for pulping the waste paper material to form a slushed fibrous stock and dispersing ink particles within the stock, said apparatus including means for removing dispersed ink particles from the stock, cha ⁇ racterised in that said ink removal means are arranged to remove dispersed ink particles from the stock whilst it is contained in the pulping vessel and/or to remove dispersed ink particles from the stock whilst it is contained in a storage vessel to which it has passed from the pulping vessel.
  • the ink removal means may con ⁇ sist of vacuum means arranged to be used in the pulping vessel and/or storage vessel.
  • the vacuum means may comprise a vacuum device having a suction tube which is arranged to be lowered into, and lifted out of, the pulping vessel and/or storage vessel.
  • the ink removal means com ⁇ prises a container supported in the pulping vessel and /or storage vessel, said container having a perforated wall structure such that ink particles circulating in the stock as it is stirred or agitated by a stirring device mounted in said vessel can pass through said perforations into said container but the fibres forming said stock are substan ⁇ tially prevented from passing through said perforations.
  • the apparatus preferably includes means for lowering the container into, and raising it out of, the vessel.
  • the apparatus may also include means for swinging the container to the side of the vessel to facilitate cleaning or mainte ⁇ nance.
  • the container may be in the form of a basket, in which the perforated wall structure comprises a mesh mate ⁇ rial.
  • the ink removal means includes a mechanism for removing the ink particles from the contain ⁇ er.
  • the vessel is circular in cross-section, and the stirring device, which may be a bladed rotor, may be mounted substantially centrally in the base of the vessel such that a central vortex is created in use of the stirring device.
  • the vessel and stirring device may be formed by the vessel and associated rotor of a pulping vessel, such as a hydropulper, or a storage vessel, such as a stock chest, already existing at the mill.
  • the apparatus may also include means for introduc ⁇ ing at least one stream of air, water, or air and water, into the pulping vessel and/or storage vessel, and prefera ⁇ bly into the lower part of the vessel at the bottom of the vortex formed by the stirring device.
  • the stream assists the speed of ink removal by increasing the speed of flow of the stock in the region of the stirring device, and effects a degree of washing.
  • Figure 1 shows a schematic cross-sectional view of an apparatus according to one embodiment of the invention
  • Figure 2 shows a schematic cross-sectional view of another embodiment of the invention.
  • Figure 3 shows a schematic cross-sectional view of a further embodiment.
  • a pulping vessel 1 such as a hydropulper or a low consistency batch pulper, is provided with a central bladed rotor 2 which is located at the bottom of the vessel and is arranged to be driven at a variable speed.
  • a mixture of waste paper material and water is placed in the vessel and stirred or agitated by means of the rotor 2 to form a pulp of slushed fibrous stock 3.
  • a container 4, in the form of a mesh basket having either a solid or mesh base, is lowerable into the centre of the vessel 1 by means of any suitable raising and lowering mechanism diagrammatically indicated by 7.
  • a suction tube 5 extends into the basket 4 for removing ink 6 which accu ⁇ mulates in the basket during operation of the apparatus.
  • An air line 8 is located beneath the rotor 2 for introducing a stream of air into the stock, and a further air and water line is positioned for directing an air/water mixture onto the turning rotor blades also during operation of the apparatus.
  • the basket 4 is lowered by means of the mechanism 7 into the centre of the vessel 1, in which a central vortex is created in the stock 3 by driving the rotor 2, the intensity of which can be controlled by vary ⁇ ing the speed of the rotor.
  • the basket 4 and its ancillary equipment such as the suction tube 5 is constructed such that it may be raised and lowered quickly and smoothly and also swung clear to the side of the vessel 1 for cleaning or maintenance.
  • a cleaning mechanism (not shown) such as a water spray may be provided for cleaning the basket. Air and water are added by means of the lines 8,9 to assist agitation of the stock. The water and air are introduced at the bottom of the vortex, which increases the speed of flow of the stock in that region.
  • the air stream 8 may be of particular assistance during pulping to in ⁇ crease the speed of ink dispersal.
  • the water and air stream 9 also produces a washing action which facilitates the dispersal of ink particles from the paper fibre.
  • Such addition of water may be delayed until later in the process of pulping. Also the introduction of water can be pro ⁇ longed in the later stages of pulping so that the process essentially becomes a two stage treatment.
  • ink particles separate from the agitated stock 3 they pass through the perforations of the mesh to col ⁇ lect in the basket 4, as shown at 6, while the fibre compo ⁇ nent is prevented from so doing by the mesh.
  • the mesh size is chosen to suit the particular stock under treatment. To this end several baskets of different mesh size may be provided.
  • the stock 3 circulating around the outside of the basket 4 will continually "wipe" the outer surface and minimise the build-up of fibre which can otherwise quickly block or blind the mesh.
  • the material used in the manufac ⁇ ture of the mesh can be metal or plastic depending upon the size and operation of the apparatus, the constraints of the process, and the cost.
  • the outer mesh size may be larger than that of the inner, and again the mesh size and material of each basket wall is chosen to suit the length of fibre, under treatment and the process conditions.
  • a rotating, flexible wiper blade can also be fitted to run between the two walls in order to encourage passage of ink to the inside of the basket while preventing fibre building up on the inner wall.
  • the speed of the rotor 2 may be periodically increased, and then reduced to allow the dispersed ink particles 6 to collect in the basket 4.
  • This cycle may be operated several times for each batch of stock 3, the frequency and intensity depending upon the type of waste paper under treatment, the ink involved, and the production rate required.
  • Accumulated ink particles 6 can be removed from the basket 4 by continuous or intermittent suction through the tube 5.
  • a cleaning mechanism such as rotating scoops or paddles may be operat ⁇ ed, either intermittently or continuously.
  • the apparatus can be easily adapted to oper ⁇ ate in a continuous process by ensuring that there is an adequate cleaning mechanism provided and that the process is operated for sufficient time to allow for a satisfactory level of ink dispersal from the stock.
  • Some water may also collect in the basket 4, and ink particles may be separated from the water fraction in a separate operation by the addition of a suitable flocculat ⁇ ing agent, for example papermaker's alum, or polyelectro- lytes, and any waste water may be passed back into the process.
  • a suitable flocculat ⁇ ing agent for example papermaker's alum, or polyelectro- lytes
  • This process may be influenced by the type of ink involved and the stock conditions appertaining to each mill, for example pH, temperature, fibre type and degree of mechanical treatment of that fibre.
  • the operation of this water recovery system may. be a major factor in the econom ⁇ ics of running the mill and thus the waste ink is prefera ⁇ bly removed as a concentrated sludge.
  • the means for removing dispersed ink particles from the stock 3 in the pulping vessel 1 consists of a vacuum device 10 having a vacuum suction tube 11 connected to the device 10 by a flexible hose 12.
  • the suction tube 11 is supported in a generally vertical position by a first support 13 and the flexible hose 12 is supported by a second support 14.
  • the two supports 13 and 14 are movable in a horizontal direction by means of wheels 15 located in fixed runners 16.
  • a pulley mechanism consisting of pulley wheels 17 and a flexible rope or chain 18 is mounted on the second support 14 and is connected to the upper end of the suction tube 11.
  • a handle 19 is provided to operate the pulley mechanism to lower, and raise, the suction tube 11 into, and out of, the stock 3 contained within the pulping vessel 1.
  • a scum 20 which consists of a mixture of ink particles and some slushed fibres blown up by the air bubbles forms in the centre of the vortex created by the stirring or agitation.
  • the scum is removed from the pulping vessel 1 by suction up through the suction tube 11, through the hose 12 and the vacuum device 10, and through an outlet 21 to an ink separator (not shown) for removing the water from the ink particles.
  • Figure 3 shows yet another embodiment, in which the same vacuum means is utilised as in the embodiment of Figure 2, but instead it is used for removing ink particles from the stock 3 contained in a storage vessel 22, such as a stock chest, to which the stock has been passed from a pulping vessel (not shown in Figure 3).
  • the storage vessel 22 includes a rotor 23 for gently agitating or stirring the stock 3 and the ink particles are removed therefrom in the same manner as described above in relation to Figure 2.
  • the container arrangement shown in Figure 1 may be used in the storage vessel 22 shown in Figure 3 to remove the dispersed ink particles from the stock contained therein, with the rotor 23 of the storage vessel 22 agitating or stirring the stock 3.
  • Common papermaking chemicals may be added to the stock.
  • a chemical agent for dispersing ink from the fibre for example Enessco P (Trade Mark)
  • a chemical which prevents redeposition of the ink onto the fibre for example sodium carboxy methylcellulose (SCMC) may be added.
  • inorganic filler particles such as talc, china clay, whiting, to absorb any free ink in the system.
  • the invention is particularly suitable for removing ink from low consistency stock of, for example, 2 to 10% paper fibres in water.
  • low consistency stock of, for example, 2 to 10% paper fibres in water.
  • the invention could be used for high consistency stock, for example of 10-30%, which has been pulped in the hydropulper and then trans ⁇ ferred to the stock chest and has been diluted either prior to or in the stock chest before the ink particles are removed.
  • the present invention thus enables, a pulper, such as a hydropulper or low consistency batch pulper, to be used as a combined pulper/primary flotation cell, where in practice some 50-60% of the ink is separated and removed from the slushed stock at a consistency of between 4-8%. Additionally or alternatively, the present invention ena ⁇ bles a storage vessel, such as a stock chest, to be used as a combined stock chest/primary flotation cell. In either case, the invention is rendered particularly useful in mills where floor space is at a premium and where there is a limited budget, so that the use of conventional separate flotation cells is not possible.
  • a pulper such as a hydropulper or low consistency batch pulper
  • Such an invention serves four main purposes:
  • deinking at the initial stages of the recycling process can prevent 50-60% of the ink going into the normally recycled backwater, giving better white water clarity by preventing the carrying of ink through the first half of the system;

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

Procédé et appareil de désencrage de déchets de papier dans lesquels les matériaux sont réduits en pâte dans une cuve de réduction en pâte (1) pour former une pâte épaisse et fibreuse avec des particules d'encre en dispersion. Dans l'une des formes d'exécution, on réalise la dispersion de pâte et d'encre et on enlève ensuite les particules d'encre en dispersion dans la même cuve de réduction en pâte. On verse un mélange de déchets de papier et d'eau dans ladite cuve (1), par exemple un hydrobroyeur, où il est mélangé et agité par un rotor (2) pour former ladite pâte fibreuse épaisse (3). Pendant l'opération de réduction en pâte, les particules d'encre se dispersent dans la pâte (3), de sorte qu'on peut les en enlever soit par un dispositif d'aspiration sous vide (10, 11) soit en les faisant passer à travers les parois d'un récipient à perforations (4). Des conduits (8, 9) introduisent les flux d'air et de mélange eau/air dans la cuve (1) pour accélérer la vitesse de désencrage. Dans une autre forme d'exécution, après la réalisation de la dispersion de pâte et d'encre dans ladite cuve (1), la pâte est transférée dans une cuve de stockage (22), telle qu'un réservoir de stockage, pour enlever ensuite les particules d'encre par ledit dispositif d'aspiration sous vide (10, 11) par exemple, ou le récipient à perforations (4).
PCT/GB1991/001892 1990-10-30 1991-10-29 Procede et appareil de desencrage de dechets de papier WO1992007993A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP3517139A JPH06504327A (ja) 1990-10-30 1991-10-29 古紙材料からインクを除去するための方法と装置
BR9107039A BR9107039A (pt) 1990-10-30 1991-10-29 Processo e aparelho para a remocao de tinta de material de papel refugado
FI931963A FI931963A0 (fi) 1990-10-30 1993-04-30 Foerfarande och anordning foer avlaegsning av blaeck fraon avfallspappersmaterial
NO931588A NO931588D0 (no) 1990-10-30 1993-04-30 Fremgangsmaate og apparat for aa fjerne farge fra avfallspapirmateriale

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GB9023564.9 1990-10-30
GB909023564A GB9023564D0 (en) 1990-10-30 1990-10-30 Apparatus for removing ink from waste paper pulp
GB909027001A GB9027001D0 (en) 1990-12-12 1990-12-12 Apparatus for removing ink from waste paper pulp
GB9027001.8 1990-12-12

Publications (1)

Publication Number Publication Date
WO1992007993A1 true WO1992007993A1 (fr) 1992-05-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1991/001892 WO1992007993A1 (fr) 1990-10-30 1991-10-29 Procede et appareil de desencrage de dechets de papier

Country Status (9)

Country Link
EP (1) EP0579601A1 (fr)
JP (1) JPH06504327A (fr)
AU (1) AU8748891A (fr)
BR (1) BR9107039A (fr)
CA (1) CA2095342A1 (fr)
FI (1) FI931963A0 (fr)
HU (1) HUT65639A (fr)
PT (1) PT99377A (fr)
WO (1) WO1992007993A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0726880A1 (fr) * 1993-11-04 1996-08-21 International Paper Company Suppression de l'encre d'une pate a papier recyclee
KR101863331B1 (ko) * 2017-03-02 2018-06-07 주식회사 지에스나노셀 폐지 탈묵 및 셀룰로오스 분리장치

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH205551A (de) * 1938-04-04 1939-06-30 Sydney Becker Denis Robert Verfahren und Einrichtung zur Wiedergewinnung der faserigen Bestandteile von Faserstofferzeugnissen.
US2916216A (en) * 1952-07-25 1959-12-08 Butler Co Method and apparatus for preparing paper making stock
US2949187A (en) * 1957-03-28 1960-08-16 Thomas M Owens Removing impurities from fluid suspensions
US3102858A (en) * 1960-05-23 1963-09-03 Union Associates Inc Apparatus for removing strings from liquid solutions
DE2906599B1 (de) * 1979-02-21 1979-10-25 Voith Gmbh J M Flotationsvorrichtung
DE3334448A1 (de) * 1982-10-19 1984-04-19 J.M. Voith Gmbh, 7920 Heidenheim Stoffloeser
DE3910349A1 (de) * 1988-03-31 1989-10-12 Satomi Seisakusho Kk Papiermaterial-aufbereitungsvorrichtung

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH205551A (de) * 1938-04-04 1939-06-30 Sydney Becker Denis Robert Verfahren und Einrichtung zur Wiedergewinnung der faserigen Bestandteile von Faserstofferzeugnissen.
US2916216A (en) * 1952-07-25 1959-12-08 Butler Co Method and apparatus for preparing paper making stock
US2949187A (en) * 1957-03-28 1960-08-16 Thomas M Owens Removing impurities from fluid suspensions
US3102858A (en) * 1960-05-23 1963-09-03 Union Associates Inc Apparatus for removing strings from liquid solutions
DE2906599B1 (de) * 1979-02-21 1979-10-25 Voith Gmbh J M Flotationsvorrichtung
DE3334448A1 (de) * 1982-10-19 1984-04-19 J.M. Voith Gmbh, 7920 Heidenheim Stoffloeser
DE3910349A1 (de) * 1988-03-31 1989-10-12 Satomi Seisakusho Kk Papiermaterial-aufbereitungsvorrichtung

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DE PAPIERWERELD vol. 12, no. 4, November 1957, page 73; 'Meer dan 1500 originele Hydrapulpers' advertisement BLACK-CLAWSON see the whole document *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0726880A1 (fr) * 1993-11-04 1996-08-21 International Paper Company Suppression de l'encre d'une pate a papier recyclee
EP0726880A4 (fr) * 1993-11-04 1999-04-28 Int Paper Co Suppression de l'encre d'une pate a papier recyclee
KR101863331B1 (ko) * 2017-03-02 2018-06-07 주식회사 지에스나노셀 폐지 탈묵 및 셀룰로오스 분리장치

Also Published As

Publication number Publication date
CA2095342A1 (fr) 1992-05-01
BR9107039A (pt) 1993-09-08
EP0579601A1 (fr) 1994-01-26
FI931963A (fi) 1993-04-30
HUT65639A (en) 1994-07-28
PT99377A (pt) 1993-12-31
AU8748891A (en) 1992-05-26
JPH06504327A (ja) 1994-05-19
HU9301276D0 (en) 1993-09-28
FI931963A0 (fi) 1993-04-30

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