EP0138484A2 - Réduction en pâte par voie mécanique - Google Patents

Réduction en pâte par voie mécanique Download PDF

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Publication number
EP0138484A2
EP0138484A2 EP84306656A EP84306656A EP0138484A2 EP 0138484 A2 EP0138484 A2 EP 0138484A2 EP 84306656 A EP84306656 A EP 84306656A EP 84306656 A EP84306656 A EP 84306656A EP 0138484 A2 EP0138484 A2 EP 0138484A2
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EP
European Patent Office
Prior art keywords
passing
refiner
discharge
comminuted
mechanical pulp
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Withdrawn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
EP84306656A
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German (de)
English (en)
Other versions
EP0138484A3 (fr
Inventor
James Robert Prough
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.)
Metso Fiber Karlstad AB
Original Assignee
Kamyr AB
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Filing date
Publication date
Application filed by Kamyr AB filed Critical Kamyr AB
Publication of EP0138484A2 publication Critical patent/EP0138484A2/fr
Publication of EP0138484A3 publication Critical patent/EP0138484A3/fr
Withdrawn legal-status Critical Current

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    • 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
    • D21B1/02—Pretreatment of the raw materials by chemical or physical means
    • D21B1/021—Pretreatment of the raw materials by chemical or physical means by chemical means
    • 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

Definitions

  • mechanical pulping in general, refers to thermomechanical pulp (TMP), chemimechanical (CMP) and chemithermomechnical pulp (CTMP). While mechanical pulps can be useful for a number of purposes, oftentimes they cannot be made bright enough for many intended end uses, and their brightness tends to degrade over time. Further, the mechanical refining process utilized as the main component of mechanical pulping processes often results in breakdown of fibers having desirable characteristics so that the final pulp produced has relatively poor drainage properties, and relatively poor strength.
  • a method for enhancing the brightness and/or drainage and strength properties of mechanical pulp, whether it be TMP, CMP, or CTMP.
  • TMP, CMP or CTMP is produced by sequentially: (i) Impregnating comminuted fibrous cellulosic material with chemical or thermal treating fluid. (ii) Washing the impregnated material. The washing is preferably accomplished by passing a washing liquid including chelating and surface active agents countercurrent to the flow of material, and is effective to remove a number of materials that subsequently could have an adverse affect on pulp brightness, including residual cooking chemicals, metals, color bodies, and resins. (iii) The washed material is mechanically refined to produce a . mechanical pulp, preferably having a consistency of about 6-15 percent. And, (iv) further treatment, including bleaching with hydrosulfite and/or peroxide, of the mechanical pulp is effected in order to achieve the desired properties.
  • a CMP or CTMP pulp is produced by effecting a countercurrent flow of sulfite chemical and comminuted fibrous cellulosic material, to effect impregnation of the material.
  • the material may subsequently be cooked, and thereafter is refined and further treated as described above.
  • the countercurrent impregnation provides very effective penetration of the chips, or other material, with sulfite liquor, and ultimately results in more uniform removal of impurities from the chips in such a way as to improve pulp properties and decrease bleach costs.
  • a mechanical pulp is produced by series refining. Chips, or like comminuted cellulosic fibrous material, are pretreated, and then passed to a first pressurized refiner. From the first refiner the mechanical pulp passes to a screen, which screens out pulp portions in need of further refining into a first stream, and pulp fibers already having desired properties into a second stream. The first stream is passed to a second pressurized refiner having a discharge, and the second stream is passed directly to the second refiner discharge.
  • the mechanical pulp according to the present invention has enhanced strength and drainage, and can be bleached to a higher brightness level than is possible in the prior art, (e.g., 5 Kappa units higher) and may be bleached to any given brightness level more easily.
  • FIGURE 1 shows the step by step production of CMP according to a method of the present invention
  • FIGURES 2 and 3 show methods for the production of CTMP and TMP, respectively, with stages therein identical to those in FIGURE 1 not illustrated.
  • hardwood or softwood chips, or other comminuted cellulosic fibrous material are first steamed at station 11. Then they are subjected to countercurrent impregnation with sulfite (e.g. sodium sulfite) chemical at station 12, the countercurrent action properly distributing the chemical in the chips.
  • sulfite e.g. sodium sulfite
  • the chemical facilitates removal of water soluble substances and some of the lignin and polysaccharides, although most of the lignin and polysaccharides remain in the material.
  • the wash liquid preferably includes chelating and surface active agents, such as EDPA and DPTA.
  • the wash effects removal of residual cooking chemicals, metals, color bodies, and resins.
  • the countercurrent impregnation and countercurrent wash at stations 12, 13, combined remove impurities very uniformly and in such a way as to improve pulp properties, decrease subsequent bleaching costs, and maximize the brightness to which the pulp may be bleached.
  • the washed chips are passed from station 13 to a first pressurized refining stage 14, at which a mechanical refiner acts on the chips to form a mechanical pulp.
  • the pulp at this stage usually has a consistency of about 6-15 percent, and the pulp, at this consistency, is passed to a screening station 15 wherein it is separated into first and second streams 16, 17.
  • the first stream comprises pulp components that require further refining, while the second stream 17 contains pulp portions having fibers with desirable properties so that further refining thereof is not necessary.
  • the first stream 16 is passed to a second pressurized refining stage 18 while the second stream 17 is passed directly to the discharge line 19 from the second refiner stage 18. In this way fibers having desired properties are not further broken down, and thus the drainage and strength of the pulp is improved.
  • the pulp in discharge line 19, with a consistency of 6-15 percent, is further treated in any manner desirable to produce CMP having the necessary properties. Typically this would include a wash station 20 and a bleach station 21. During bleaching, hydrosulfite and/or peroxide would be added to the pulp, and the final product produced would be bleached CMP.
  • CTMP typically has enhanced strength compared to other mechanical pulps - such as TMP, although the yield is slightly lower - and is particularly suited for pulping of high density hardwoods.
  • FIGURE 3 shows a typical process for producing TMP.
  • no impregnation stage 12 is provided.
  • the chips would be steamed for a longer period of time than in the FIGURES 1 or 2 embodiments, and additionally a further vessel may be provided for the addition of heat in the form of steam or hot liquid. After passing through stages 13 through 21, a TMP is produced.
  • FIGURE 4 illustrates in more detail exemplary apparatus that could be utilized to produce CMP according to the present invention.
  • the chips are fed to a conventional steaming chips bin 25, and are subsequently metered to the intake for an upright vessel 27.
  • vessel 27 countercurrent impregnation and countercurrent washing of the chips takes place.
  • Sodium sulfite, or like chemical suitable for the production of CMP is fed from source 28 through heat exchanger 29 to the vessel 27 and introduced at an appropriate point 30.
  • the chemical flows upwardly in the vessel 27, countercurrent to the downward flow of chips.
  • Pump 31 continuously withdraws chemical from vessel 27 through screens, and reintroduces the chemical adjacent inlet 26 to entrain the chips therein.
  • the washed chips pass through line 35 to a conventional drainer 36, and the separated liquid is returned to the vessel 27 under the influence of pump 37.
  • the chips are fed to first pressurized refiner 38, and are mechanically acted on to produce a mechanical pulp.
  • the method is practiced so that the pulp typically would have a consistency of about 6-15 percent. Without depressurization or dilution, the pulp is then screened by a screen 39.
  • the screen 39 separates pulp portions in need of further refining into a first stream 40, while fibers already having desired properties are separated into a second stream 41.
  • First stream 40 may be passed through a cyclone 42, and then to a second pressurized refiner 43, while the second stream 41 is passed directly to the discharge 44 from second refiner 43.
  • the mechanical pulp may be passed to a pressurized blow tank 45 for heat recovery and subsequently, again without dilution, pumped by pump 46 to another screen mechanism 47 substantially identical to the screen 39.
  • Rejects from screen 47 pass to rejects chest 48 and subsequently through thickener 49 and into rejects refiner 50, ultimately to be returned via line 51 to the inlet to screen 47.
  • Accepts from screen 47 are pumped by pump 52 to cleaner 53, ultimately are washed in a pressure diffuser 54, and are otherwise subsequently treated.
  • the pulp may pass to a high density storage tank 55, and then may be simultaneously pumped and degassed by pump 56, passed to a mixer 57 at which hydrosulfite bleaching chemical is introduced, and then is subsequently retained in retention vessel 58, with CMP having enhanced brightness and/or drainage and strength characteristics being produced.
  • a CTMP can be produced.
  • components with the identical functionality to the components illustrated in FIGURE 4 are indicated by the same reference numeral only preceded by a "1".
  • the chips are fed to a conventional chips bin 125, and then are steamed in a steaming vessel 60.
  • the chips are entrained with liquid in chute 126 and high pressure feeder 61 feeds them to the top of vessel 62. Sand, and other undesirable components, can be separated out utilizing components 63, 64.
  • the upright vessel 62 is designed to impregnate the chips, retain them for a "cook", and wash them.
  • the vessel 62 is structurally similar to conventional continuous digesters for producing chemical pulp that have impregnation, cooking, and washing zones. Sulfite cooking chemical may be added at any desired point, such as into line 65, and the heat exchanger 66 heats the chemical to the desired temperature.
  • Sulfite cooking chemical may be added at any desired point, such as into line 65, and the heat exchanger 66 heats the chemical to the desired temperature.
  • the chips are retained in a cooking zone for a predetermined period of time, and countercurrent washing takes place at the bottom of the vessel 62, wash liquid being added through line 67.
  • the chips slurry discharged from the bottom of the vessel 62 passes to drainer 136 and first pressurized refiner 138.
  • Pressurized blow tank 145 is provided after first refiner 138, and the pulp, preferably with a consistency of about 6 - 15 percent, is pumped by pump 68 to screen 139, with the pulp material in the first stream 140 passing to the second pressurized refiner 143, and the pulp fibers in the second stream 141 being passed directly to the discharge 144 from the second refiner.
  • the pulp is then introduced into decker 69, is pumped by pump 70 to the top of pressure diffuser 154 in which it is washed, and is discharged from diffuser 154 into up-flow tower 71.
  • Peroxide bleaching chemical may be added to line 72 and introduced to the pulp in diffuser 154, the tower 71 retaining the pulp and bleaching chemical for a predetermined period of time before it is discharged to second decker 73. From there it passes to high density storage tank 155 and is pumped by pump 156 to mixer 157 at which point hydrosulfite bleaching chemical is introduced. After retention in up-flow tower 158, the final CTMP is produced.
  • FIGURE 6 can also be utilized to produce CTMP, and contemplates refining pulp having a much wider concentration range (e.g., about 5-50%).
  • concentration range e.g., about 5-50%).
  • components with substantially the same functionality as components illustrated in FIGURE 4 are indicated by the same reference numeral only preceded by a "2".
  • the suspension of comminuted fibrous cellulosic material may be dewatered utilizing conventional dewatering apparatus 80 (such as a plug screw feeder or screw press) in line 235.
  • Dewatering apparatus 80 may be used in place of or in addition to, conventional drainer 236.
  • the suspension from dewaterer 80 may have a concentration as high as 50% when it is fed to the first refiner 238.
  • the apparatus 80 may be pressurized, or unpressurized, depending upon other apparatus utilized.
  • Pulp discharged from first refiner 238 - if of high concentration - is diluted utilizing conventional dilution equipment 81 prior to screen 239.
  • the discharge from screen 239 into line 240 is preferably pressed utilizing conventional press 82 prior to cyclone 242 so that the refiner 243 also acts upon high concentration pulp (e.g., 16-50%).
  • the discharge from a refiner 243 in line 244 is then again diluted utilizing dilution apparatus 83 so that it has substantially the same concentration as the pulp in line 241, before it is passed to the blow tank 245.
  • the pulp according to the present invention has improved strength and drainage properties compared to conventional mechanical pulps produced under comparable treatment conditions.
EP84306656A 1983-10-20 1984-09-28 Réduction en pâte par voie mécanique Withdrawn EP0138484A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US54384783A 1983-10-20 1983-10-20
US543847 1983-10-20

Publications (2)

Publication Number Publication Date
EP0138484A2 true EP0138484A2 (fr) 1985-04-24
EP0138484A3 EP0138484A3 (fr) 1986-07-02

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ID=24169776

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84306656A Withdrawn EP0138484A3 (fr) 1983-10-20 1984-09-28 Réduction en pâte par voie mécanique

Country Status (6)

Country Link
EP (1) EP0138484A3 (fr)
JP (1) JPS60146090A (fr)
BR (1) BR8405320A (fr)
CA (1) CA1240456A (fr)
FI (1) FI844071L (fr)
NO (1) NO844062L (fr)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0194981A2 (fr) * 1985-03-13 1986-09-17 Göran Bengtsson Procédé de fabrication d'une pâte chimi-mécanique et semi-chimique blanchie par un procédé d'imprégnation à une seule étape
EP0194982A2 (fr) * 1985-03-13 1986-09-17 Eka Nobel Aktiebolag Procédé de fabrication d'une pâte chimi-mécanique et semi-chimique blanchie par un procédé d'imprégnation à deux étapes
WO1988003581A1 (fr) * 1986-11-06 1988-05-19 Sunds Defibrator Aktiebolag Procede de fabrication de pulpe mecanique
US5853534A (en) * 1992-12-30 1998-12-29 Sunds Defibrator Industries Ab Method of producing pulp with high yield using a two-stage refining system operating at different temperatures
WO2001042557A1 (fr) * 1999-12-09 2001-06-14 Upm-Kymmene Corporation Matiere premiere pour papier d'impression, procede de production associe et papier d'impression ainsi obtenu
US6878236B2 (en) 1999-12-09 2005-04-12 Upm-Kymmene Corporation Raw material for printing paper, a method for producing said raw material and a printing paper
WO2007063171A1 (fr) * 2005-12-02 2007-06-07 M-Real Oyj Procédé de production d’une pâte chimico-mécanique
WO2008076055A1 (fr) * 2006-12-19 2008-06-26 Akzo Nobel N.V. Procédé de réduction en pâte
WO2008154073A1 (fr) * 2007-06-12 2008-12-18 Meadwestvaco Corporation Fibre présentant un rendement élevé et des performances améliorées
US8262851B2 (en) 2006-08-10 2012-09-11 Andritz Inc. Processes and systems for the pulping of lignocellulosic materials
WO2013141776A1 (fr) * 2012-03-23 2013-09-26 Metso Paper Sweden Ab Procédé et agencement pour le nettoyage de matières lignocellulosiques pendant l'imprégnation
CN107503214A (zh) * 2017-10-11 2017-12-22 山东恒安纸业有限公司 一种新型生活用纸备浆装置及工艺
US10060075B2 (en) 2007-06-12 2018-08-28 Westrock Mwv, Llc Fiber blend having high yield and enhanced pulp performance and method for making same

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB785060A (en) * 1954-04-08 1957-10-23 Waldhof Zellstoff Fab Process for obtaining bleached semi-chemical pulp
US4116758A (en) * 1976-05-14 1978-09-26 Canadian International Paper Co. Method of producing high yield chemimechanical pulps
GB1547939A (en) * 1976-07-19 1979-07-04 Crown Zellerbach Corp Sulphite-modified thermomechanical pulp for use in linerboard
US4229250A (en) * 1979-02-28 1980-10-21 Valmet Oy Method of improving properties of mechanical paper pulp without chemical reaction therewith
EP0034560A2 (fr) * 1980-02-14 1981-08-26 Beloit Corporation Procédé et dispositif pour la production efficace d'une pâte cellulosique par le procédé de réduction en pâte thermo-mécanique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB785060A (en) * 1954-04-08 1957-10-23 Waldhof Zellstoff Fab Process for obtaining bleached semi-chemical pulp
US4116758A (en) * 1976-05-14 1978-09-26 Canadian International Paper Co. Method of producing high yield chemimechanical pulps
GB1547939A (en) * 1976-07-19 1979-07-04 Crown Zellerbach Corp Sulphite-modified thermomechanical pulp for use in linerboard
US4229250A (en) * 1979-02-28 1980-10-21 Valmet Oy Method of improving properties of mechanical paper pulp without chemical reaction therewith
EP0034560A2 (fr) * 1980-02-14 1981-08-26 Beloit Corporation Procédé et dispositif pour la production efficace d'une pâte cellulosique par le procédé de réduction en pâte thermo-mécanique

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0194981A2 (fr) * 1985-03-13 1986-09-17 Göran Bengtsson Procédé de fabrication d'une pâte chimi-mécanique et semi-chimique blanchie par un procédé d'imprégnation à une seule étape
EP0194982A2 (fr) * 1985-03-13 1986-09-17 Eka Nobel Aktiebolag Procédé de fabrication d'une pâte chimi-mécanique et semi-chimique blanchie par un procédé d'imprégnation à deux étapes
EP0194981A3 (en) * 1985-03-13 1987-04-22 Eka Ab A method of manufacturing bleached chemimechanical and semichemical fibre pulp by means of a one-stage impregnation process
EP0194982A3 (en) * 1985-03-13 1987-04-22 Eka Ab A method of manufacturing bleached chemimechanical and semichemical fibre pulp by means of a two-stage impregnation process
US4900399A (en) * 1985-03-13 1990-02-13 Eka Ab Method of manufacturing bleached chemi-mechanical and semichemical fibre pulp by a two-stage impregnation process
WO1988003581A1 (fr) * 1986-11-06 1988-05-19 Sunds Defibrator Aktiebolag Procede de fabrication de pulpe mecanique
US5853534A (en) * 1992-12-30 1998-12-29 Sunds Defibrator Industries Ab Method of producing pulp with high yield using a two-stage refining system operating at different temperatures
WO2001042557A1 (fr) * 1999-12-09 2001-06-14 Upm-Kymmene Corporation Matiere premiere pour papier d'impression, procede de production associe et papier d'impression ainsi obtenu
US6818099B2 (en) 1999-12-09 2004-11-16 Upm-Kymmene Corporation Raw material for printing paper, method to produce it and printing paper
US6878236B2 (en) 1999-12-09 2005-04-12 Upm-Kymmene Corporation Raw material for printing paper, a method for producing said raw material and a printing paper
WO2007063171A1 (fr) * 2005-12-02 2007-06-07 M-Real Oyj Procédé de production d’une pâte chimico-mécanique
AU2006319052B2 (en) * 2005-12-02 2011-03-24 M-Real Oyj Process for producing chemi-mechanical pulp
US8262851B2 (en) 2006-08-10 2012-09-11 Andritz Inc. Processes and systems for the pulping of lignocellulosic materials
WO2008076055A1 (fr) * 2006-12-19 2008-06-26 Akzo Nobel N.V. Procédé de réduction en pâte
WO2008154073A1 (fr) * 2007-06-12 2008-12-18 Meadwestvaco Corporation Fibre présentant un rendement élevé et des performances améliorées
WO2008153565A1 (fr) * 2007-06-12 2008-12-18 Meadwestvaco Corporation Mélange de fibres présentant un rendement élevé et des performances de pâte améliorées, et son procédé de fabrication
EP2672004A1 (fr) * 2007-06-12 2013-12-11 MeadWestvaco Corporation Fibre présentant un rendement élévé et des performances améliorées
EP2672005A1 (fr) * 2007-06-12 2013-12-11 MeadWestvaco Corporation Fibre présentant un rendement éléve et des performances améliorées
US10000889B2 (en) 2007-06-12 2018-06-19 Westrock Mwv, Llc High yield and enhanced performance fiber
US10060075B2 (en) 2007-06-12 2018-08-28 Westrock Mwv, Llc Fiber blend having high yield and enhanced pulp performance and method for making same
WO2013141776A1 (fr) * 2012-03-23 2013-09-26 Metso Paper Sweden Ab Procédé et agencement pour le nettoyage de matières lignocellulosiques pendant l'imprégnation
CN107503214A (zh) * 2017-10-11 2017-12-22 山东恒安纸业有限公司 一种新型生活用纸备浆装置及工艺

Also Published As

Publication number Publication date
FI844071A0 (fi) 1984-10-16
JPS60146090A (ja) 1985-08-01
CA1240456A (fr) 1988-08-16
BR8405320A (pt) 1985-09-03
EP0138484A3 (fr) 1986-07-02
NO844062L (no) 1985-04-22
FI844071L (fi) 1985-04-21

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