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1. (WO1991006700) A METHOD OF PRODUCING CELLULOSIC PULP
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/006700 International Application No.: PCT/SE1990/000721
Publication Date: 16.05.1991 International Filing Date: 06.11.1990
Chapter 2 Demand Filed: 03.06.1991
IPC:
D21B 1/02 (2006.01) ,D21B 1/16 (2006.01) ,D21C 1/00 (2006.01)
D TEXTILES; PAPER
21
PAPER-MAKING; PRODUCTION OF CELLULOSE
B
FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
1
Fibrous raw materials or their mechanical treatment
02
Pretreatment of the raw materials by physical or chemical means
D TEXTILES; PAPER
21
PAPER-MAKING; PRODUCTION OF CELLULOSE
B
FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
1
Fibrous raw materials or their mechanical treatment
04
by dividing raw materials into small particles, e.g. fibres
12
by wet methods, by the use of steam
14
Disintegrating in mills
16
in the presence of chemical agents
D TEXTILES; PAPER
21
PAPER-MAKING; PRODUCTION OF CELLULOSE
C
PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE- CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
1
Pretreatment of the finely-divided materials before digesting
Applicants:
STFI [SE/SE]; Box 5604 S-114 86 Stockholm, SE (AllExceptUS)
ENGSTRAND, Per [SE/SE]; SE (UsOnly)
HAMMAR, Lars-Åke [SE/SE]; SE (UsOnly)
SJÖGREN, Birger [SE/SE]; SE (UsOnly)
SVENSSON, Börje [SE/SE]; SE (UsOnly)
HTUN, Myat [SE/SE]; SE (UsOnly)
Inventors:
ENGSTRAND, Per; SE
HAMMAR, Lars-Åke; SE
SJÖGREN, Birger; SE
SVENSSON, Börje; SE
HTUN, Myat; SE
Agent:
ONN, Thorsten ; AB Stockholms Patentbyrå Zacco & Bruhn Box 23101 S-104 35 Stockholm, SE
Priority Data:
8903710-506.11.1989SE
Title (EN) A METHOD OF PRODUCING CELLULOSIC PULP
(FR) PROCEDE DE PRODUCTION DE PATE DE CELLULOSE
Abstract:
(EN) Mechanical and chemimechanical cellulose pulp, particularly paper pulp, is produced at a low energy input by disintegrating and beating wood material in one or more stages. Acccording to the invention, a substance capable of forming complexes with polyvalent metal ions, particularly calcium ions, so-called complexing agent, is added to the wood material prior to the beating process in order to replace said calcium or other polyvalent metal ions with sodium ions, therewith a further reduction in the energy input is obtained.
(FR) On produit de la pâte de cellulose mécanique et chimico-mécanique, notamment de la pâte à papier, à une entrée de faible énergie, par désintégration et trituration de matière ligneuse en une ou en plusieurs étapes. Selon l'invention, on ajoute une substance capable de former des complexes avec des ions métal polyvalents, notamment des ions calcium, appelée agent de transformation en complexe, à la matière ligneuse, avant le procédé de trituration, afin de remplacer lesdits ions calcium ou autre métal singulier polyvalent par des ions sodium, ce qui permet de réduire davantage l'entrée d'énergie.
Designated States: AU, BR, CA, FI, JP, NO, SU, US
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
FI922025NO19921771EP0500674JPH05503965CA2073048AU1990067205