EP0677122B1 - A method of producing mechanical and chemi-mechanical pulp - Google Patents

A method of producing mechanical and chemi-mechanical pulp Download PDF

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Publication number
EP0677122B1
EP0677122B1 EP94904362A EP94904362A EP0677122B1 EP 0677122 B1 EP0677122 B1 EP 0677122B1 EP 94904362 A EP94904362 A EP 94904362A EP 94904362 A EP94904362 A EP 94904362A EP 0677122 B1 EP0677122 B1 EP 0677122B1
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EP
European Patent Office
Prior art keywords
temperature
refining
lignin
feed
softening temperature
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
Application number
EP94904362A
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German (de)
English (en)
French (fr)
Other versions
EP0677122A1 (en
Inventor
Hans HÖGLUND
Roland BÄCK
Ove Danielsson
Bo Falk
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.)
Valmet AB
SCA Research AB
Original Assignee
Sunds Defibrator Industries AB
SCA Research AB
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Publication date
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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
    • 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
    • D21B1/14—Disintegrating in mills
    • 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

Definitions

  • This invention relates to the production of mechanical and chemi-mechanical pulp with a yield of above 85% from ligno-cellulose-containing material for the making of paper or board products.
  • the first step normally is pressurized, i.e. the refining takes place at temperatures exceeding 100°C, usually immediately below or at the so-called softening temperature (Tg) of the lignin.
  • Tg softening temperature
  • the softening temperature of the lignin which has proved to be an important variable at the refining of chips in mechanical and chemi-mechanical pulp processes, has been determined in the most recent decades in a number of scientific investigations for a plurality of wood types concerned. At the investigations standard equipment and conventional measuring principles for the determination of viscoelastic parameters have been used. For wood, as for other viscoelastic materials, the softening temperature varies with the load frequency at the measurements. At a higher load frequency, the softening temperature increases. At the processing frequencies normally applied in refiners the softening temperature of coniferous wood was determined to be between 125°C and 145°C, while it proved to be somewhat lower for our most usual hardwood types. The softening temperature can be shifted by the addition of different chemicals. It can be lowered, for example, after impregnation by usual lignin softening chemicals, of the type sulphite.
  • the present invention relates to such a method, where the mechanical processing, for example refining, takes place in at least two steps.
  • the material at its feed into the first processing step has a temperature below the softening temperature of the lignin, and at its feed into at least one subsequent processing step has a temperature exceeding the softening temperature of the lignin.
  • refining takes place in at least two steps.
  • the chips are fed into the refiner at a temperature below the softening temperature of the lignin and then are processed under relatively intensive conditions, for example in a double-disc refiner with a speed of at least 1200 rpm or in a single-disc refiner with high relative speed between the refiner discs (at least 1800 rpm, preferably at least 2400 rpm).
  • the energy input in the first step is chosen to be on such a low level, that the long fiber content of the pulp which a.o. yields the potential for the later strength development at the refining, is not deteriorated appreciably.
  • the freenes (CSF) of the pulp after the first step therefore, shall be high, preferably > 500 ml.
  • a subsequent refining step is carried out under conditions where the lignin of the fiber material is well softened.
  • the fiber material then is fed into the refiner at a temperature exceeding the softening temperature of the lignin.
  • the temperature should exceed 150°C, suitably 160°C and preferably 170°C.
  • the temperature should exceed 135°C, suitably 150°C and preferably 160°C.
  • temperatures over 200°C should be avoided, a.o. with regard to dark colouring of the fiber material.
  • the processing frequency preferably can be high (relative speed at least 2400 rpm) at the processing of the well-softened fiber material, which has proved especially favourable from an energy point of view.
  • the temperature difference between the temperatures of the material at its feed into the first and, respectively, a subsequent processing step should be at least 15°C, suitably at least 25°C and preferably at least 35°C.
  • fractures and fracture indications in the material initially are guided to layers in the fiber wall not rich in lignin.
  • the known fact then can be utilized, that the fiber material can be separated with low energy inputs in areas rich in lignin at temperatures above the softening temperature of the wood lignin.
  • the fractures initially having been guided to areas not rich in lignin, it is thereby avoided to obtain a fiber material with only lignin-covered surfaces which are difficult to fibrillate. This has previously been the great problem when it was tried to utilize refining temperatures above the softening temperature of the lignin at the production of mechanical pulps for printing paper or board products.
  • Fine material from areas between the initial fracture zone and the middle lamina of the fiber rich in lignin also is easily released at temperatures above the softening temperature of the lignin in the later refining step, which can explain the low total energy consumption to a certain freeness (CSF) in this process step and in the entire process according to the invention.
  • CSF freeness
  • Thermomechanical pulp from spruce chips was produced after refining in two steps in a 20" single-disc refiner of a well-equipped test plant.
  • the first refining step (defibering) was carried out after preheating the chips at 115°C for about 3 minutes, i.e. at a temperature below the softening temperature of the lignin.
  • the refiner was driven by a 3000 rpm motor, in order to ensure that the initial defibering should not take place under too mild conditions.
  • the effect input in the first step was 640 kwh/t, which yielded a pulp with freeness (CSF) 518 ml.
  • thermomechanical pulp was made from spruce chips after refining in two steps by single-disc refiners.
  • the first refining step was carried out at temperatures above the softening temperature of the lignin in the same equipment which was used previously in the test.
  • the conditions in the first refining step and the freeness after refining with a certain energy input are described in the following Table: Test Preheating time, min Refining temp. °C Motor speed rpm Energy input kWh/t Freeness ml E about 1 150 (> Tg) 3000 940 450 F " 1 160 ( >Tg) 1500 900 580 G " 1 160 (>Tg) 3000 790 415
  • Figs. 7 and 8 show freeness as a function of energy consumption and, respectively, light scattering as a function of freeness.
  • chemicals can be added advantageously after or during the first refining step, in order to avoid dark colouring at the high temperatures above the softening temperature of lignin in subsequent refining steps.
  • the chemicals also can have a bleaching effect.
  • Examples of such chemicals are sodium sulphite, sodium bisulphite, sodium ditionite, peroxide etc.
  • the initial processing can be carried out, besides in refiners, also in grinders, compressing screws or other mechanical processing equipment.
  • this reject with a temperature above the softening temperature of lignin shall be fed into at least one subsequent processing step.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Chemical And Physical Treatments For Wood And The Like (AREA)
EP94904362A 1992-12-30 1993-12-08 A method of producing mechanical and chemi-mechanical pulp Expired - Lifetime EP0677122B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9203943 1992-12-30
SE9203943A SE470555B (sv) 1992-12-30 1992-12-30 Förfarande för tillverkning av mekanisk och kemimekanisk massa med ett utbyte av över 85 % från lignocellulosahaltigt fibermaterial
PCT/SE1993/001058 WO1994016139A1 (en) 1992-12-30 1993-12-08 A method of producing mechanical and chemi-mechanical pulp

Publications (2)

Publication Number Publication Date
EP0677122A1 EP0677122A1 (en) 1995-10-18
EP0677122B1 true EP0677122B1 (en) 1998-09-09

Family

ID=20388282

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94904362A Expired - Lifetime EP0677122B1 (en) 1992-12-30 1993-12-08 A method of producing mechanical and chemi-mechanical pulp

Country Status (17)

Country Link
EP (1) EP0677122B1 (sv)
JP (1) JP3258019B2 (sv)
KR (1) KR950704567A (sv)
CN (1) CN1052049C (sv)
AT (1) ATE170940T1 (sv)
AU (1) AU678802B2 (sv)
BR (1) BR9307748A (sv)
CA (1) CA2151364C (sv)
DE (1) DE69320989T2 (sv)
FI (1) FI115844B (sv)
NO (1) NO312206B1 (sv)
NZ (1) NZ259595A (sv)
PL (1) PL309195A1 (sv)
RU (1) RU95113478A (sv)
SE (1) SE470555B (sv)
WO (1) WO1994016139A1 (sv)
ZA (1) ZA939370B (sv)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1157016A (zh) * 1995-06-12 1997-08-13 安德里兹·斯普劳特-鲍尔有限公司 低停留时间、高温和高速的木屑研磨
US6364998B1 (en) * 1995-06-12 2002-04-02 Andritz Inc. Method of high pressure high-speed primary and secondary refining using a preheating above the glass transition temperature
US6899791B2 (en) 1997-08-08 2005-05-31 Andritz Inc. Method of pretreating lignocellulose fiber-containing material in a pulp refining process
US7300541B2 (en) 2002-07-19 2007-11-27 Andritz Inc. High defiberization chip pretreatment
DE102007057580A1 (de) * 2007-11-28 2009-06-04 Bühler AG Verfahren zur Verarbeitung lignocellulose-haltiger Rohmaterialien
SE540115C2 (sv) 2016-09-21 2018-04-03 A paper or paperboard product comprising at least one ply containing high yield pulp and its production method
EP3642411A1 (en) * 2017-06-20 2020-04-29 Basf Se Method of increasing the throughput and/or decreasing energy usage of a pulping process
FR3117123B1 (fr) 2020-12-09 2023-12-15 Michelin & Cie Composition de caoutchouc presentant une resistance amelioree aux agressions mecaniques
FR3117122B1 (fr) 2020-12-09 2023-12-15 Michelin & Cie Bandage pour vehicule hors la route

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE303088B (sv) * 1963-05-31 1968-08-12 Defibrator Ab
SE466060C (sv) * 1990-02-13 1995-07-11 Moelnlycke Ab Absorberande kemitermomekanisk massa och framställning därav

Also Published As

Publication number Publication date
CN1052049C (zh) 2000-05-03
EP0677122A1 (en) 1995-10-18
DE69320989D1 (de) 1998-10-15
SE9203943L (sv) 1994-07-01
NO312206B1 (no) 2002-04-08
AU5844594A (en) 1994-08-15
DE69320989T2 (de) 1999-01-28
NZ259595A (en) 1997-10-24
AU678802B2 (en) 1997-06-12
ATE170940T1 (de) 1998-09-15
RU95113478A (ru) 1997-05-27
FI115844B (sv) 2005-07-29
KR950704567A (ko) 1995-11-20
WO1994016139A1 (en) 1994-07-21
ZA939370B (en) 1994-08-08
SE9203943D0 (sv) 1992-12-30
JP3258019B2 (ja) 2002-02-18
CA2151364C (en) 1999-02-09
FI953229A (sv) 1995-06-29
CA2151364A1 (en) 1994-07-21
FI953229A0 (sv) 1995-06-29
BR9307748A (pt) 1994-11-14
SE470555B (sv) 1994-08-22
NO952613L (no) 1995-06-29
JPH08504894A (ja) 1996-05-28
PL309195A1 (en) 1995-09-18
NO952613D0 (no) 1995-06-29
CN1092832A (zh) 1994-09-28

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