NO934229L - Procedure for Preparation of Chemical Thermomechanical Pulp - Google Patents

Procedure for Preparation of Chemical Thermomechanical Pulp

Info

Publication number
NO934229L
NO934229L NO934229A NO934229A NO934229L NO 934229 L NO934229 L NO 934229L NO 934229 A NO934229 A NO 934229A NO 934229 A NO934229 A NO 934229A NO 934229 L NO934229 L NO 934229L
Authority
NO
Norway
Prior art keywords
pulp
chemical thermomechanical
impregnating
procedure
preparation
Prior art date
Application number
NO934229A
Other languages
Norwegian (no)
Other versions
NO934229D0 (en
Inventor
Bo Falk
Thomas Granfeldt
Original Assignee
Sunds Defibrator Ind 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 Sunds Defibrator Ind Ab filed Critical Sunds Defibrator Ind Ab
Publication of NO934229L publication Critical patent/NO934229L/en
Publication of NO934229D0 publication Critical patent/NO934229D0/en

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
    • D21B1/02—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
    • D21B1/14—Disintegrating in mills
    • D21B1/16—Disintegrating in mills in the presence of chemical agents

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

Fremgangsmåte for fremstilling av kjemi-termomekanisk masse fra lignocellulose-materiale ved forvarming og raffi- nering av materialet ved en forhøyet tem- peratur på 160 - 180°C, etter at flisene er impregnert på forhånd med en impreg- neringsvæske som inneholder borhydrid, minst en forbindelse valgt fra gruppen, natriumsulfitt, natriumhydrogensulfitt og natriumdisulfitt, og eventuelt ett eller flere kompleksdannende midler. Impreg- neringsvæsken har fortrinnsvis en nøy- tral, nær nøytral eller lett sur pH- verdi. Fremgangsmåten ifølge oppfinnelsen muliggjør at misfarving av massen kan unngås og/eller at en reduksjon i masse- lyshet motvirkes i forvarmings- og raffi- neringsprosessen. Oppfinnelsen angår også en impregneringsvæske for impregnering av lignocellulose-materiale ved fremstilling av kjemi-termomekaniske masser.Process for preparing chemical thermomechanical pulp from lignocellulosic material by preheating and refining the material at an elevated temperature of 160 - 180 ° C, after the tiles are pre-impregnated with an impregnating liquid containing borohydride, at least a compound selected from the group, sodium sulfite, sodium hydrogen sulfite and sodium disulfite, and optionally one or more complexing agents. The impregnating liquid preferably has a neutral, near neutral or slightly acidic pH value. The process according to the invention enables the discoloration of the pulp to be avoided and / or that a reduction in pulp brightness is counteracted in the preheating and refining process. The invention also relates to an impregnation liquid for impregnating lignocellulosic material in the production of chemical thermomechanical masses.

NO934229A 1991-05-24 1993-11-23 Process for preparing chemo-thermomechanical pulp NO934229D0 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9101587A SE468644B (en) 1991-05-24 1991-05-24 PREPARATION OF CHEMISTRY MECHANICAL MASS AND IMPROVEMENT SOLUTION CONTAINING BORHYDRIDE AND SULPHITE
PCT/SE1992/000348 WO1992020855A1 (en) 1991-05-24 1992-05-22 A method for the manufacture of chemithermomechanical pulp

Publications (2)

Publication Number Publication Date
NO934229L true NO934229L (en) 1993-11-23
NO934229D0 NO934229D0 (en) 1993-11-23

Family

ID=20382840

Family Applications (1)

Application Number Title Priority Date Filing Date
NO934229A NO934229D0 (en) 1991-05-24 1993-11-23 Process for preparing chemo-thermomechanical pulp

Country Status (7)

Country Link
AU (1) AU1882492A (en)
CA (1) CA2109513A1 (en)
FI (1) FI935205A (en)
NO (1) NO934229D0 (en)
NZ (1) NZ242868A (en)
SE (1) SE468644B (en)
WO (1) WO1992020855A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997022749A1 (en) * 1995-12-19 1997-06-26 Kvaerner Hymac Inc. Process for treating refiner pulp
SE525872C2 (en) * 2002-09-06 2005-05-17 Stora Enso Ab Method of producing mechanical pulp with reduced energy consumption
FI121114B (en) 2007-05-04 2010-07-15 Kemira Oyj Process for the preparation of dithionite
EP2348154A1 (en) * 2010-01-22 2011-07-27 Andritz AG Method for manufacturing wooden material
EP2924166A1 (en) 2014-03-25 2015-09-30 Basf Se Method for the manufacture of bleached wood fibre

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2615874B1 (en) * 1987-05-25 1992-02-21 Atochem PROCESS FOR THE PREPARATION OF CHEMICOTHERMOMECHANICAL PASTES

Also Published As

Publication number Publication date
WO1992020855A1 (en) 1992-11-26
SE9101587D0 (en) 1991-05-24
CA2109513A1 (en) 1992-11-25
SE9101587L (en) 1992-11-25
SE468644B (en) 1993-02-22
NZ242868A (en) 1994-11-25
FI935205A0 (en) 1993-11-23
FI935205A (en) 1993-11-23
NO934229D0 (en) 1993-11-23
AU1882492A (en) 1992-12-30

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