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1. (WO1992010606) METHOD OF TREATMENT OF WASTE PAPER OR THE LIKE
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1992/010606 International Application No.: PCT/CA1991/000434
Publication Date: 25.06.1992 International Filing Date: 09.12.1991
Chapter 2 Demand Filed: 09.07.1992
IPC:
D21B 1/32 (2006.01) ,D21B 1/36 (2006.01) ,D21C 5/02 (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
04
by dividing raw materials into small particles, e.g. fibres
12
by wet methods, by the use of steam
30
Defibrating by other means
32
of waste paper
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
30
Defibrating by other means
36
Explosive disintegration by sudden pressure reduction
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
5
Other processes for obtaining cellulose, e.g. cooking cotton linters
02
Working-up waste paper
Applicants:
STAKE TECHNOLOGY LIMITED [CA/CA]; 2838 Highway 7 Norval, Ontario L0P 1K0, CA
CHESAPEAKE RESOURCES COMPANY [US/US]; 1021 East Cary Street P.O. Box 2350 Richmond, VA 23218, US
Inventors:
BOUCHETTE, Michael, P.; US
YU, Ernest, K., C.; CA
Agent:
STRAZNICKY, Ivan; Gowling, Strathy & Henderson 160 Elgin Street Ottawa, Ontario K1N 8S3, CA
Priority Data:
624,96510.12.1990US
Title (EN) METHOD OF TREATMENT OF WASTE PAPER OR THE LIKE
(FR) PROCEDE DE TRAITEMENT DE VIEUX PAPIERS OU DE MATERIAUX SIMILAIRES
Abstract:
(EN) Method is disclosed of treatment of waste paper or the like at high temperatures in the range of 160 °C to about 230 °C. The furnish is treated in a digester with or without added chemicals but in the presence of saturated steam. The preferred dwell times are in the range of about 1 minute to about 6 minutes. The treated furnish is then discharged from the digester, preferably, but not exclusively, by an explosive discharge. The advance in the art is in an improved de-inking effect, reduced consumption of chemicals and power. Also, some furnishes previously unsuitable for re-cycling, have been successfully processed by the method of the invention.
(FR) On décrit un procédé permettant de traiter les vieux papiers ou les matériaux similaires à des températues élevées comprises entre environ 160 °C et environ 230 °C. La charge est traitée dans un lessiveur avec ou sans adjonction de produits chimiques mais en présence de vapeur saturée. Les temps de séjour préférentiels se situent entre environ 1 et 6 minutes. La charge ainsi traitée est ensuite évacuée du lessiveur, de préférence mais non pas exclusivement, par une décharge explosive. L'invention se caractérise par une amélioration du désencrage, une diminution de l'utilisation de produits chimiques et une réduction de la consommation d'énergie. De plus, certaines charges qui ne pouvaient être recyclées par les anciens procédés ont pu être traitées avec succès par le procédé de l'invention.
Designated States: AT, AU, BB, BG, BR, CA, CH, CS, DE, DK, ES, FI, GB, HU, JP, KP, KR, LK, LU, MG, MN, MW, NL, NO, PL, RO, SD, SE, SU
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, MC, NL, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
CA2098092AU1991090205